Quarter Turn Pneumatic Actuator for Ball, Butterfly & Plug Valves
ISO 5211 / NAMUR compliant, available in double-acting and spring return options, built for reliable valve automation and fast OEM selection.
Quarter Turn Pneumatic Actuator for Ball, Butterfly & Plug Valves
Item Number: HPA series | Double Acting | Single Acting (Spring Return)
- Body Material: Extruded Aluminum, Surface Hardened Aluminium Coated, Epoxy Painted
- Output Torque (@ 5 Bar): DA: 8 – 8,140 Nm | SR: 5.7 – 2,181 Nm
- Working Temperatures: -20°C~80°C/-50°C ~80°C/-20°C~160°C
- Bearing Material: Industrial Hardened Plastic
- Connection Standard: ISO 5211 (Valve) | NAMUR VDI/VDE 3845 (Accessories)
- Air Supply: 2-8 Bar
- Application: Ball and Butterfly Valves, Dampers on-off or Proportional Control
- Certificates：ISO 9001, CE, ATEX, SIL3, EAC and IP67
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Custom Actuator Housing Color
We customize quarter turn pneumatic actuator housing colors (RAL/Pantone) with durable epoxy powder coating to match your corporate brand identity, system color-coding, or specific project aesthetic requirements.
Custom OEM Label
We offer private label quarter turn pneumatic actuator solutions for distributors and OEM valve makers. Choose corrosion-resistant metal plates (stainless/aluminum) with laser-etched logos, or high-tack weatherproof industrial stickers.
18-Month Factory Warranty
Every quarter turn pneumatic actuator includes an 18-month warranty from the shipment date, providing a 6-month buffer beyond industry standards for ocean transit, customs clearance, and warehouse stocking.
Description of HPA Series Rotary Quarter-Turn Pneumatic Actuators
Hearken HPA series quarter turn pneumatic actuator is a compact rack-and-pinion pneumatic actuator for 90° rotation on ball valves, butterfly valves, and industrial dampers. Two symmetrical pistons convert compressed air into smooth torque output in both double-acting and spring-return.
Specifications & Features:
- Zero Side-Load Piston Design: Symmetrical pistons balance internal drive forces. Hearken design stops shaft binding and protects your stem seals from premature fluid leaks.
- Standardized Housing Across Models: Our double-acting and spring-return quarter turn pneumatic actuators use the same outer housing and mounting dimensions. You can standardize your mounting brackets and simplify spare parts inventory across different safety loops.
- Direct ISO 5211 & NAMUR Mounting: Bottom mounting pads match ISO 5211 tolerances (F03 through F25) for direct assembly onto your valve topworks (If your valve is ISO 5211 standard). Top and front ports conform to NAMUR (VDI/VDE 3845) standards, so you can attach limit switch boxes, positioners, and solenoid valves without custom adapters.
- Precise ±5° External Travel Adjustment: Independent stainless steel adjustment bolts on both end caps give you precise stroke calibration at open and closed positions, simplifying final valve alignment in your workshop.
- 1,000,000-Cycle Durability: Tested to 1,000,000 operations and backed by an 18-month factory warranty to lower your field service costs.
- Corrosion-Resistant Housing: Hard-anodized internal cylinder walls reduce friction. On the outside, epoxy-coated end caps protect against chemical splash and outdoor weather.
- 100% Factory Inspection: We test every HPA series quarter-turn pneumatic actuator for leakage, rotation angle, and torque output before dispatch. Stamped serial numbers give your team complete batch traceability.
- HPA Series Pneumatic Actuator Certificates：ISO 9001, CE, ATEX, SIL3, EAC and IP67
- Optional Accessories Available: Solenoid valve · Limit switch box · Electro-pneumatic positioner · Manual override gearbox · Air filter regulator
- Direct OEM Customization: Hearken provides factory-direct private labeling, custom torque sizing, 3-position dosing (0°–45°–90° or 0°–90°–180°), and extended rotation options (120°, 135°, 180°).
Need Bulk Quotes or Volume Pricing?
Direct factory support for valve manufacturers and distributors.
Dual Hard-Anodized Protection: Housing and Pistons
All Hearken pneumatic quarter-turn actuators come standard with hard-anodized housings and pistons for maximum durability.
| Specification | Normal Anodizing | Hard Anodizing |   |
| Coating Thickness | 5 – 25 μm | 25 – 50 μm (Industrial Standard) | |
| Surface Hardness | 200 – 300 HV | 350 – 700 HV | |
| Wear Resistance | Standard | Heavy-Duty / High Abrasion | |
| Designed Duty | Light-duty / Low-cycle | 10 Bar / 1-Million Cycles | |
| Best For | General protection | High-cycle applications | |
Our Surface Treatment Options: While hard anodizing is our default manufacturing process, we also offer alternative surface treatments to match different market needs and OEM build specifications:
Whether your target market requires competitive upfront pricing or long-term operational reliability, we supply actuators built to your exact order specifications. | |||
Material & Engineering Options for Actuator Cost Optimization
Hearken quarter-turn pneumatic actuators come standard with full-specification materials for long service life and stable performance. We also provide flexible material and design options across cylinders, end caps, and drive shafts to match different budget requirements:
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| Cylinder Weight & Wall Thickness: Hearken quarter-turn pneumatic actuators use full-thickness aluminum walls—using 10%–15% more metal—to handle high working pressures without flexing or leaking. For budget-focused orders, we can supply lighter-weight cylinder options with reduced wall thickness, or shorter body lengths for lower-torque applications, to lower raw material costs and unit prices. | End Cap Weight & Design: Quarter-turn pneumatic actuators come standard with thick die-cast aluminum end caps for strong pressure resistance and long-term sealing. For basic or lower-pressure applications, we can supply lighter end-cap structures to reduce manufacturing costs. We also offer alternative end-cap designs from Gen 1 to Gen 4 to match different valve automation setups and price points. | Drive Shaft Material, Dimensions & Length: For drive shafts, we machine solid 307g components from high-strength 45# carbon steel (AISI 1045) with thick nickel plating for high torque strength and rust protection. We can also customize drive shafts for quarter-turn pneumatic actuators using alternative carbon steel grades (such as 20# steel), adjusted shaft lengths/extensions for specific valve mounting, or reduced dimensions to fit strict target prices. |
We supply quarter-turn pneumatic actuators built to your exact order specifications, whether your focus is full-spec reliability or competitive market pricing.
Customization Options – HPA Series Rotary Quarter-Turn Pneumatic Actuators
| Manual Override Options | Housing Material Options | |||
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| HPAM Series (Integrated Handwheel) | HPA+HDM Series (Manual Gearbox) | Aluminum Alloy (HPA Series) | Stainless Steel (HPAS Series) | Engineering Plastic (HPAP Series) |
| Rack and pinion pneumatic actuator with an integrated side handwheel and spring stop pin for manual override. Built for standard 90° rotation only; wide-angle travel (120° or 180°) is not available. | HDM Manual Gearbox is an optional add-on gearbox for standard HPA actuators. It offers a flexible alternative to HPAM, allowing manual override to be installed or retrofitted only where required. | Extruded aluminum body with hard-anodized bore and polyester-coated end caps. Lightweight and cost-effective for general industrial applications. | ASTM 304 or 316L stainless steel body with electro-polished finish. Maximum corrosion resistance for chemical, marine, and severe-service environments. | Glass-fiber reinforced polyamide body. Chemically inert, approximately 1/2 the weight of aluminum and 1/5 of stainless steel. Ideal for corrosive media and overhead installations. |
| Housing Length & Adjustment Range | Top Drive Shaft Options | Stroke Adjustment Location Options | ||||
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| Short Housing | Long Housing | Long Housing + Optional Long Screws | HPA Series Standard NAMUR Shaft | HPA Series Extended Top Shaft (Extended NAMUR Drive) | Front Adjustment Screws (HPA Series) | Rear Adjustment Screws (HAT Series) |
| Standard ±5° travel stops on both end caps | Standard ±5° travel stops on both end caps | Full 0° to 90° range – adjustable via optional long screws on both ends | Standard enclosed top cover with built-in position indicator. Ideal for standard on/off use. | Extended NAMUR shaft top drive. Allows direct, adapter-free mounting of limit switch boxes and positioners. | Dual stroke adjustment screws located on the front side above NAMUR air ports. Provides direct, convenient front-access calibration alongside NAMUR accessories and solenoid connections. | Dual stroke adjustment screws positioned on the rear side. Facilitates easy rear access for field tuning without interfering with front solenoid valve mounting or air port connections. |
| Stroke Options | ||||
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| HPA 90° | HPA 120° | HPA 135° | HPA 180° | HPA 3-Position |
| Standard 90° rotation. Ideal for ball valves, butterfly valves, and dampers. | 120° rotation for special valve or damper stroke needs. | 135° rotation for custom rotary applications. | 180° rotation for 3-way valves and divert applications. | 3-position control with adjustable mid-position. Ideal for batching, filling, and flow control. |
| Indicator Types | |||||||
| regular | option | ||||||
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| Adjust Screws | End Caps | |||
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| External Hex Head Screws | Hex Socket Set Screws / Grub Screws | Socket Head Cap Screws | Evolution of pneumatic actuator end caps from 1st to 4th generation | Custom End Caps (No Mold Required): Embossed & Debossed for Small Batches |
Looking for Factory-Direct OEM Supply & Custom Branding?
Tailor HPA actuators to your brand specs—flexible stroke options, custom housing finishes, and factory-installed accessories.
✓ Direct Factory Manufacturing
✓ ISO 5211 & NAMUR Standard Mounting
✓ OEM Labeling & Color Customization
✓ Competitive Bulk Pricing
✓ ISO 5211 & NAMUR Standard Mounting
✓ OEM Labeling & Color Customization
✓ Competitive Bulk Pricing
⚡ 24-hour response for OEM specs & volume quotes
Materials and Component
 | Nickel-Plated Alloy Pinion: High-strength alloy steel pinions receive a protective nickel plating (SS304 optional) to reduce gear friction and guard against moisture in your compressed air lines. Full SS304 External Hardware: Hearken standardizes on SS304 stainless steel for all cap screws, stop bolts, adjust screws, and washers. You get rust-free teardowns without frozen threads. Hard-Anodized Body & Polyester End Caps: Our extruded aluminum cylinder features a hard-anodized internal wall, while die-cast end caps receive a heavy polyester paint coat. This protects your actuators from chemical splash and outdoor weather. Piston Bearings: Hearken uses engineering plastic bearing pads to guide internal pistons. This avoids internal cylinder scratches and extends seal life across your high-cycle operations. O-Rings: Hearken provides NBR seals as standard, along with Viton (FKM) and EPDM options to match your high-temperature or aggressive fluid specs. |
| Description | Material | Qty | Description | Material | Qty | ||
| 1 | Indicator Screw | ABS | 1 | 15 | O-ring Adjust Screw | NBR (VITON or EPDM on request) | 2 |
| 2 | Position Indicator | ABS | 1 | 17 | Nut Adjust Screw | Stainless Steel 304 | 2 |
| 3 | Spring Clip | Stainless Steel 304 | 1 | 18 | Adjust Screw | Stainless Steel 304 | 2 |
| 4 | Metal Washer | Stainless Steel 304 | 1 | 19 | Piston | Die Cast Aluminum Alloy | 2 |
| 5 | O-Ring Washer | Engineering Plastic | 1 | 20 | Piston Bearing | Engineering Plastic/Anodized | 2 |
| 6 | Body | Extruded Aluminum Alloy | 1 | 21 | Bearing Piston | Engineering Plastic | 2 |
| 7 | Inner Washer | Engineering Plastic/Hard Anodized | 1 | 22 | O-ring Piston | NBR (VITON or EPDM on request) | 2 |
| 8 | Travel Stop | AlloySteel | 1 | 23 | Spring Group | Spring Steel | 0~12 |
| 9 | O-ring Pinion Top | NBR (VITON or EPDM on request) | 1 | 24 | O-ring End Cap | NBR (VITON or EPDM on request) | 2 |
| 10 | Bearing Pinion Top | Engineering Plastic | 1 | 25 | End Cap | Cast Aluminum/Polyester Paint | 2 |
| 11 | Pinion | Alloy Steel (Electroless Nickel Plated) /SS304 is Optional | 1 | 26 | Cap Screw | Stainless Steel 304 | 8 |
| 12 | Bearing | Engineering Plastic | 1 | 27 | Stop Screw | Stainless Steel 304 | 2 |
| 13 | Bearing Pin on bottom | NBR (VITON or EPDM on request) | 1 | 28 | Star Adaptor | Carbon Steel | 1 |
| 14 | Hole Sealant | NBR (VITON or EPDM on request) | 2 |
Hearken HPA Series Pneumatic Actuator Production Process
How Hearken manufactures robust, high-cycle rack and pinion actuators to power your valve automation packages.
Step 1: Raw Profile Sourcing & Precision Sawing | Step 2: Precision CNC Machining | Step 3: Precision Housing Inspection | Step 4: Hard Anodizing & Precision Surface Inspection |
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| When raw materials aluminum and steel arrive, Hearken inspects the thickness and material density first. We precision-saw each cylinder to exact batch lengths. You can get consistent housing dimensions across your order and reliable structural strength under line pressure | Our multi-axis CNC machines handle precision milling, boring, and exterior profiling in-house. We maintain tight tolerances across all machined components to keep piston movement smooth and avoid drive-shaft binding under operating pressure. | We use precision steel gauges to check the cylinder bore, shaft hole alignment, and thread depth on every batch of HPA housings. This ensures smooth shaft rotation and prevents mechanical sticking. | Extruded aluminum bodies and die-cast pistons undergo hard anodizing in a low-temperature electrolyte bath. This process builds a uniform 25-50 μm protective oxide layer with surface hardness up to 350-500 HV. It provides both the cylinder body and piston with high wear resistance and strong corrosion protection. |
Step 5: Precision & Safety Assembly | Step 6: Leak Testing & Stroke Adjustment | Step 7: IP Rating & Waterproof Testing | Step 8: Torque & Spring Return Testing |
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| During assembly, we grease the cylinder wall evenly, fit the pistons, and align the shaft so it moves smoothly without sticking. | Every assembled HPA quarter turn pneumatic actuator passes 100% underwater air testing to check for internal and external leaks. Then adjust the 90° rotation with ±5° travel stops to make sure the valve closes completely and accurately. | HPA series quarter turn pneumatic actuators undergo high-pressure spray and immersion tests on our dedicated bench. Checking the end-cap gaskets and shaft O-rings ensures full IP67 sealing for outdoor and wet installations. | We test each quarter turn pneumatic actuator on an automated bench before shipping. Digital sensors measure the output torque to make sure it has enough power to operate your valve smoothly without sticking. For spring-return models, we cut off the air supply to guarantee 100% reliable emergency shutdown if loses power or air. |
Step 9: Factory Test Report Generation | Step 10: Foam Box, Single Carton & Wooden Case Packaging | ||
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| Every Hearken quarter turn pneumatic actuator comes with an official factory test report. Exact torque ratings, stroke settings, and operating pressure specs are recorded under a unique serial number for complete quality traceability. | Each Hearken quarter-turn pneumatic actuator is packed in a custom foam box inside a strong single carton, and then loaded into heavy-duty export wooden cases for safe shipping. | ||
Ready to Scale Your Supply Chain with Direct Factory Pricing?
Direct factory support, 15–25 day lead times, and tier pricing for OEMs and wholesalers.
Compatible Valve Configurations
Mounts standard quarter-turn valves seamlessly—no custom work or extra adapters needed.
| Valve Type | How HPA Quarter Turn Pneumatic Actuator Mounts Your Existing Valves |
| Ball Valves | Direct mount for standard topworks. Bottom ISO 5211 flange bolts directly to ball valves. The star drive socket mounts both square and flat stems without extra brackets. |
| Butterfly Valves | High opening torque for rubber & metal seats. Provides peak torque at the start of travel to overcome seat tightness cleanly without twisting the stem. |
| Plug Valves | Precision ±5° travel stop alignment. Dual external adjusting screws fine-tune open and close limits on site, ensuring the plug port aligns perfectly with the pipeline to prevent port erosion. |
| Dampers & Louvers | Mounts tight spaces & flexible rotation angles. Lightweight aluminum body reduces weight on thin ductwork. Available in 90°, 120°, 180°, and 3-position setups for multi-way air control. |
Industry Applications For HPA Series Quarter Turn Pneumatic Actuator
| Industry Sector | Application Performance & Field Advantages |
| Chemical Processing | Corrosion protection for harsh environments. Hard-anodized aluminum body and epoxy-coated end caps protect internal parts from chemical splash and weather, ensuring low maintenance in high-corrosion areas. |
| Water Treatment | Long seal life for high-frequency use.Self-lubricating piston guides prevent seal wear during continuous operation, stopping air leaks and avoiding unexpected plant downtime. |
| Factory Automation | Standard mounting for quick accessory setup. NAMUR top drive and side ports allow direct installation of limit switch boxes and solenoid valves without extra adapters. |
| Pulp & Mining | Spring return for emergency shutdown. Safety spring sets provide automatic fail-safe closure during air supply or power failure. |
Technical Specifications
Standard Specification
| Movement： | Standard adjustable 90°±% | Indicator： | Open/Close Disc | Piston Guides： | Self lubricating(Polypropylene+GF)Piston Seals Nitrile** |
| Lubrication： | All moving parts are lubricated for life-long cycle | Travel Stops： | External adjustable±5% in both open/closed position | Piston： | Die casted aluminium dual piston |
| Cycle Life： | 1,000,000 Operations | Springs： | High tensile spring sets of alloy steel | End Caps： | Polyester coated die cast aluminium |
| Body： | Hard anodized extruded Aluminium alloy | Piston Shaft： | Nickel plated alloy steel reduces friction | ||
| Temperature Options: | Standard: -20~+80°C; Low: -50~+80°C; High: -15~+150°C | ||||
Torque Value
Air Consumption And weight Table
| Model | DA Weight (Kgs) | SR Weight (Kgs) | Air Volume opening | Air Volume closing | Model | DA Weight (Kgs) | SR Weight (Kgs) | Air Volume opening | Air Volume closing | Model | DA Weight (Kgs) | SR Weight (Kgs) | Air Volume opening | Air Volume closing |
| DA/SR 032 | 0.7 | – | 0.04 | 0.05 | DA/SR 092 | 4.6 | 5.2 | 0.64 | 0.473 | DA/SR 210 | 47 | 55 | 7.5 | 7.5 |
| DA/SR 040 | 1 | 1.1 | 0.08 | 0.11 | DA/SR 105 | 6.8 | 6.9 | 0.95 | 0.88 | DA/SR 240 | 67 | 80 | 11 | 9 |
| DA/SR 052 | 1.4 | 1.5 | 0.12 | 0.16 | DA/SR 125 | 8.9 | 10.1 | 1.6 | 1.4 | DA/SR 270 | 97 | 118 | 17 | 14 |
| DA/SR 063 | 2 | 2.1 | 0.21 | 0.23 | DA/SR 140 | 13 | 15 | 2.5 | 2.2 | DA/SR 300 | 110 | 130 | 23.8 | 29.7 |
| DA/SR 063 | 2.7 | 2.9 | 0.3 | 0.34 | DA/SR 063 | 20 | 24 | 3.7 | 3.2 | DA/SR 350 | 186 | 234 | 35.1 | 46.3 |
| DA/SR 083 | 3.1 | 3.6 | 0.43 | 0.47 | DA/SR 190 | 31 | 35 | 5.9 | 5.4 | DA/SR 400 | 289 | 360 | 52.6 | 56 |
Output Torque Of HPA Rack and Pinion Pneumatic Actuator
| Model | Air supply pressure(Unit:bar) | |||||||||
| 2 | 2.5 | 3 | 4 | 4.5 | 5 | 5.5 | 6 | 7 | 8 | |
| HPA032DA | 3 | 4 | 5 | 6 | 7 | 8 | 8 | 9 | 11 | 12 |
| HPA040DA | 5 | 6 | 7 | 10 | 11 | 12 | 13 | 14 | 17 | 19 |
| HPA052DA | 8 | 10 | 12 | 16 | 18 | 20 | 22 | 24 | 28 | 32 |
| HPA063DA | 15 | 18 | 22 | 29 | 33 | 36 | 40 | 44 | 51 | 58 |
| HPA075DA | 20 | 25 | 30 | 40 | 45 | 50 | 55 | 60 | 70 | 80 |
| HPA083DA | 31 | 39 | 47 | 63 | 70 | 78 | 86 | 94 | 110 | 125 |
| HPA092DA | 45 | 56 | 68 | 90 | 102 | 113 | 124 | 135 | 158 | 181 |
| HPA105DA | 66 | 83 | 99 | 132 | 149 | 165 | 182 | 198 | 231 | 264 |
| HPA125DA | 100 | 125 | 150 | 200 | 226 | 251 | 276 | 301 | 351 | 401 |
| HPA140DA | 171 | 214 | 256 | 342 | 385 | 427 | 470 | 513 | 598 | 684 |
| HPA160DA | 266 | 332 | 399 | 532 | 598 | 665 | 731 | 798 | 931 | 1064 |
| HPA190DA | 426 | 532 | 638 | 851 | 958 | 1064 | 1170 | 1277 | 1490 | 1702 |
| HPA210DA | 532 | 665 | 798 | 1064 | 1197 | 1330 | 1463 | 1596 | 1862 | 2128 |
| HPA240DA | 769 | 932 | 1154 | 1539 | 1731 | 1924 | 2116 | 2308 | 2693 | 3078 |
| HPA270DA | 1170 | 1462 | 1754 | 2339 | 2632 | 2924 | 3216 | 3509 | 4094 | 4679 |
| HPA300DA | 1526 | 1908 | 2289 | 3052 | 3434 | 3815 | 4197 | 4578 | 5341 | 6104 |
| HPA350DA | 2285 | 2856 | 3427 | 4570 | 5141 | 5712 | 6283 | 6854 | 997 | 9139 |
| HPA400DA | 3256 | 4070 | 4884 | 6512 | 7326 | 8140 | 8954 | 9768 | 11396 | 13024 |
Output Torque of Air Springs
| Unit:N.m | |||||||||||||||||
| Output torque of air springs | Spring’s output | ||||||||||||||||
| Air pressure | 2.5BAR | 3BAR | 4BAR | 5BAR | 6BAR | 7BAR | 8BAR | ||||||||||
| Model | Spring Qty. | 0° | 90° | 0° | 90° | 0° | 90° | 0° | 90° | 0° | 90° | 0° | 90° | 0° | 90° | 90° | 0° |
| Start | End | Start | End | Start | End | Start | End | Start | End | Start | End | Start | End | Start | End | ||
| HPA-52SR | 5 | 5.7 | 3.8 | 7.6 | 5.7 | 6.2 | 4.3 | ||||||||||
| 6 | 4.9 | 2.5 | 6.9 | 4.5 | 10.9 | 8.5 | 7.4 | 5 | |||||||||
| 7 | 4 | 1.3 | 6 | 3.3 | 9.8 | 7.3 | 14 | 10.4 | 8.6 | 5.9 | |||||||
| 8 | 5.2 | 2 | 9.2 | 6 | 13.2 | 9.1 | 17.2 | 14.1 | 9.9 | 6.7 | |||||||
| 9 | 4.3 | 0.8 | 8.3 | 4.8 | 12.3 | 7.9 | 16.3 | 12.8 | 20.3 | 16.8 | 11.1 | 7.6 | |||||
| 10 | 7.4 | 3.6 | 11.5 | 6.7 | 15.5 | 11.6 | 19.5 | 15.6 | 12.4 | 8.5 | |||||||
| 11 | 6.6 | 2.3 | 10.6 | 5.4 | 14.6 | 10.4 | 18.6 | 14.3 | 22.6 | 18.3 | 13.6 | 9.3 | |||||
| 12 | 9.7 | 4.2 | 13.8 | 9.1 | 17.8 | 12.2 | 21.8 | 17.1 | 14.8 | 10.2 | |||||||
| HPA-63SR | 5 | 11.4 | 7.7 | 15 | 11.4 | 22.3 | 14.9 | 10.4 | 6.8 | ||||||||
| 6 | 10.1 | 5.7 | 13.6 | 9.3 | 20.9 | 16.6 | 28.3 | 23.9 | 12.5 | 8.2 | |||||||
| 7 | 8.6 | 3.6 | 12.5 | 7.2 | 19.5 | 14.5 | 26.8 | 21.9 | 14.6 | 9.6 | |||||||
| 8 | 10.9 | 5.1 | 18.2 | 12.4 | 25.5 | 19.8 | 32.8 | 27 | 40.1 | 34.3 | 16.7 | 10.9 | |||||
| 9 | 16.8 | 10.4 | 24.1 | 17.7 | 31.4 | 24.9 | 38.7 | 32.2 | 18.8 | 12.3 | |||||||
| 10 | 1.4 | 8.2 | 22.8 | 15.6 | 30 | 22.8 | 37.3 | 30.1 | 44.7 | 37.4 | 20.9 | 13.7 | |||||
| 11 | 21.5 | 13.5 | 28.7 | 20.7 | 36 | 28 | 43.3 | 35.3 | 22.9 | 15 | |||||||
| 12 | 20 | 11.4 | 27.3 | 18.6 | 34.6 | 25.9 | 41.9 | 33.3 | 25 | 16.4 | |||||||
| HPA-75SR | 5 | 14.5 | 10.5 | 19.4 | 15.5 | 29.5 | 25.7 | 14.5 | 10.5 | ||||||||
| 6 | 12.4 | 7.6 | 17.3 | 12.6 | 27.4 | 22.7 | 37.5 | 32.8 | 17.4 | 12.7 | |||||||
| 7 | 10.4 | 4.8 | 15.2 | 9.7 | 25.3 | 19.9 | 35.4 | 29.9 | 20.3 | 14.8 | |||||||
| 8 | 13.1 | 6.8 | 23.1 | 16.9 | 33.3 | 27 | 43.2 | 37 | 53.3 | 47 | 23.2 | 16.9 | |||||
| 9 | 21 | 14.1 | 31.2 | 24.1 | 41.1 | 34.1 | 51.2 | 44.2 | 26.1 | 19 | |||||||
| 10 | 19 | 11.1 | 28.8 | 21.2 | 39 | 31.2 | 49.1 | 41.2 | 59.1 | 51.2 | 29 | 21.1 | |||||
| 11 | 27 | 18.3 | 37 | 28.3 | 47 | 38.4 | 57 | 48.4 | 31.9 | 23.2 | |||||||
| 12 | 24.9 | 15.4 | 34.9 | 25.4 | 44.9 | 35.4 | 54.9 | 45.4 | 34.7 | 25.3 | |||||||
| HPA-83SR | 5 | 23.3 | 16.1 | 31.1 | 24 | 46.8 | 39.7 | 23 | 15.8 | ||||||||
| 6 | 20.1 | 11.5 | 28 | 19.3 | 43.7 | 35.1 | 59.4 | 50.7 | 27.6 | 19 | |||||||
| 7 | 17 | 6.9 | 24.8 | 14.8 | 40.5 | 30.5 | 56.2 | 46.2 | 32.2 | 22.1 | |||||||
| 8 | 21.7 | 10.1 | 37.4 | 25.8 | 53.1 | 41.5 | 68.8 | 57.2 | 84.5 | 72.9 | 36.8 | 23.2 | |||||
| 9 | 34.2 | 21.3 | 49.9 | 37 | 65.6 | 52.6 | 81.2 | 68.3 | 41.4 | 28.5 | |||||||
| 10 | 31 | 16.6 | 46.7 | 32.3 | 62.4 | 48 | 78.1 | 63.7 | 93.8 | 79.3 | 46 | 31.6 | |||||
| 11 | 43.6 | 27.7 | 59.3 | 43.4 | 75 | 59.1 | 90.6 | 74.8 | 50.6 | 34.8 | |||||||
| 12 | 40.4 | 23.2 | 56.1 | 38.9 | 71.7 | 54.5 | 87.4 | 70.2 | 55.2 | 38 | |||||||
| HPA-92SR | 5 | 33.1 | 22 | 44.2 | 33.2 | 66.8 | 55.9 | 34.4 | 23.3 | ||||||||
| 6 | 28.4 | 15.2 | 39.6 | 26.4 | 62.2 | 49 | 84.8 | 71.6 | 41.2 | 28 | |||||||
| 7 | 23.8 | 8.2 | 34.9 | 19.4 | 57.5 | 42.1 | 80.2 | 64.7 | 48.1 | 32.7 | |||||||
| 8 | 31.3 | 12.6 | 52.9 | 35.2 | 75.5 | 57.9 | 98.1 | 80.5 | 120.7 | 103 | 55 | 37.3 | |||||
| 9 | 48.2 | 28.4 | 709 | 51 | 93.5 | 73.6 | 116 | 96.1 | 61.9 | 42 | |||||||
| 10 | 43.6 | 21.5 | 66.2 | 44.1 | 88.8 | 66.7 | 111.3 | 89.2 | 134 | 111.8 | 68.7 | 46.7 | |||||
| 11 | 61.5 | 37.2 | 84.1 | 59.9 | 106.6 | 82.4 | 129.2 | 105 | 75.6 | 51.4 | |||||||
| 12 | 56.8 | 30.4 | 79.4 | 53 | 101.9 | 75.5 | 124.5 | 98.1 | 82.5 | 56 | |||||||
| HPA-105SR | 5 | 51 | 33.4 | 67.5 | 49.9 | 100.6 | 83 | 124.5 | 49.2 | 31.6 | |||||||
| 6 | 44.7 | 23.5 | 61.1 | 40 | 94.2 | 73.2 | 127.3 | 106.2 | 59.1 | 38 | |||||||
| 7 | 38.4 | 13.7 | 54.9 | 30.3 | 87.9 | 63.4 | 121 | 96.4 | 68.9 | 44.3 | |||||||
| 8 | 48.5 | 20.4 | 81.6 | 53.5 | 114.7 | 86.5 | 147.7 | 119.6 | 180.8 | 152.7 | 78.7 | 50.6 | |||||
| 9 | 75.3 | 43.7 | 108.4 | 76.8 | 141.5 | 109.8 | 174.5 | 142.9 | 88.6 | 56.9 | |||||||
| 10 | 68.9 | 33.4 | 102 | 66.5 | 135.1 | 99.6 | 168.2 | 132.6 | 201.2 | 165.7 | 98.4 | 63.3 | |||||
| 11 | 95.7 | 57 | 127.7 | 90.1 | 161.8 | 123.1 | 194.8 | 156.2 | 108.3 | 69.6 | |||||||
| 12 | 89.4 | 47.5 | 122.5 | 80.6 | 155.5 | 113.6 | 188.6 | 146.7 | 118.1 | 75.9 | |||||||
| HPA-125SR | 5 | 73 | 47 | 98 | 72 | 148 | 122 | 79 | 52 | ||||||||
| 6 | 63 | 31 | 88 | 56 | 138 | 107 | 188 | 157 | 94 | 63 | |||||||
| 7 | 52 | 15 | 77 | 40 | 127 | 90 | 178 | 141 | 110 | 73 | |||||||
| 8 | 67 | 25 | 117 | 75 | 167 | 125 | 217 | 176 | 268 | 226 | 125 | 84 | |||||
| 9 | 107 | 59 | 157 | 109 | 207 | 159 | 257 | 210 | 141 | 94 | |||||||
| 10 | 96 | 44 | 146 | 94 | 196 | 144 | 247 | 194 | 297 | 245 | 157 | 105 | |||||
| 11 | 136 | 78 | 186 | 128 | 236 | 178 | 286 | 228 | 173 | 115 | |||||||
| 12 | 125 | 63 | 176 | 113 | 226 | 163 | 276 | 213 | 188 | 125 | |||||||
| HPA-140SR | 5 | 128 | 85 | 171 | 127 | 256 | 213 | 129 | 86 | ||||||||
| 6 | 111 | 59 | 154 | 102 | 239 | 187 | 325 | 273 | 155 | 103 | |||||||
| 7 | 94 | 33 | 137 | 76 | 222 | 162 | 308 | 247 | 181 | 120 | |||||||
| 8 | 120 | 50 | 205 | 136 | 291 | 221 | 376 | 307 | 462 | 392 | 206 | 137 | |||||
| 9 | 187 | 110 | 273 | 196 | 358 | 281 | 444 | 367 | 232 | 155 | |||||||
| 10 | 170 | 84 | 256 | 169 | 341 | 255 | 427 | 340 | 512 | 426 | 258 | 172 | |||||
| 11 | 238 | 143 | 324 | 229 | 409 | 314 | 495 | 400 | 284 | 189 | |||||||
| 12 | 221 | 118 | 307 | 203 | 392 | 289 | 478 | 374 | 310 | 206 | |||||||
| HPA160SR | 5 | 193 | 124 | 259 | 191 | 392 | 324 | 208 | 140 | ||||||||
| 6 | 165 | 83 | 232 | 149 | 365 | 282 | 498 | 415 | 250 | 168 | |||||||
| 7 | 137 | 41 | 203 | 107 | 336 | 240 | 469 | 373 | 292 | 196 | |||||||
| 8 | 176 | 66 | 309 | 199 | 442 | 237 | 575 | 465 | 708 | 598 | 333 | 223 | |||||
| 9 | 280 | 157 | 413 | 290 | 546 | 423 | 679 | 556 | 375 | 251 | |||||||
| 10 | 253 | 115 | 386 | 248 | 519 | 381 | 652 | 514 | 785 | 647 | 417 | 279 | |||||
| 11 | 358 | 207 | 491 | 340 | 624 | 473 | 757 | 606 | 458 | 307 | |||||||
| 12 | 330 | 165 | 463 | 298 | 596 | 431 | 729 | 564 | 500 | 335 | |||||||
| HPA190SR | 5 | 332 | 222 | 438 | 329 | 651 | 542 | 309 | 200 | ||||||||
| 6 | 292 | 161 | 398 | 267 | 611 | 480 | 824 | 693 | 371 | 240 | |||||||
| 7 | 252 | 99 | 358 | 205 | 571 | 418 | 784 | 631 | 433 | 280 | |||||||
| 8 | 318 | 143 | 531 | 356 | 744 | 569 | 957 | 782 | 1169 | 995 | 495 | 320 | |||||
| 9 | 491 | 295 | 704 | 507 | 917 | 720 | 1130 | 933 | 557 | 360 | |||||||
| 10 | 451 | 233 | 664 | 446 | 877 | 658 | 1090 | 871 | 1302 | 1084 | 618 | 400 | |||||
| 11 | 624 | 384 | 837 | 597 | 1050 | 809 | 1263 | 1022 | 680 | 440 | |||||||
| 12 | 584 | 322 | 797 | 535 | 1010 | 748 | 1223 | 960 | 742 | 480 | |||||||
| HPA210SR | 5 | 390 | 285 | 523 | 418 | 789 | 684 | 380 | 275 | ||||||||
| 6 | 335 | 209 | 468 | 342 | 734 | 608 | 1000 | 874 | 456 | 330 | |||||||
| 7 | 280 | 133 | 413 | 266 | 679 | 532 | 945 | 798 | 532 | 385 | |||||||
| 8 | 358 | 190 | 624 | 456 | 890 | 722 | 1156 | 988 | 1422 | 1254 | 608 | 440 | |||||
| 9 | 569 | 380 | 835 | 646 | 1101 | 912 | 1367 | 1178 | 684 | 495 | |||||||
| 10 | 514 | 304 | 780 | 570 | 1046 | 836 | 1312 | 1102 | 1578 | 1368 | 760 | 550 | |||||
| 11 | 725 | 494 | 991 | 760 | 1257 | 1026 | 1523 | 1292 | 836 | 605 | |||||||
| 12 | 670 | 418 | 936 | 684 | 1202 | 950 | 1468 | 1216 | 912 | 660 | |||||||
| HPA240SR | 5 | 552 | 409 | 744 | 600 | 1129 | 985 | 554 | 410 | ||||||||
| 6 | 470 | 297 | 662 | 489 | 1047 | 874 | 1432 | 1259 | 665 | 492 | |||||||
| 7 | 388 | 187 | 580 | 379 | 964 | 764 | 1349 | 1149 | 775 | 575 | |||||||
| 8 | 498 | 268 | 883 | 653 | 1267 | 1037 | 1652 | 1422 | 2037 | 1807 | 886 | 656 | |||||
| 9 | 800 | 542 | 1185 | 926 | 1569 | 1311 | 1954 | 1696 | 998 | 739 | |||||||
| 10 | 718 | 431 | 1103 | 816 | 1488 | 1201 | 1874 | 1586 | 2257 | 1970 | 1108 | 821 | |||||
| 11 | 1021 | 705 | 1406 | 1090 | 1791 | 1474 | 2176 | 1859 | 1219 | 903 | |||||||
| 12 | 939 | 594 | 1323 | 979 | 1708 | 1363 | 2093 | 1748 | 1330 | 985 | |||||||
| HPA270SR | 5 | 903 | 675 | 1195 | 968 | 1779 | 1552 | 787 | 560 | ||||||||
| 6 | 790 | 519 | 1083 | 811 | 1667 | 1396 | 2252 | 1984 | 943 | 672 | |||||||
| 7 | 679 | 361 | 972 | 654 | 1556 | 1238 | 2141 | 1823 | 1101 | 783 | |||||||
| 8 | 860 | 497 | 1444 | 1081 | 2029 | 1666 | 2614 | 2252 | 3199 | 2836 | 1258 | 895 | |||||
| 9 | 1332 | 923 | 1917 | 1509 | 2502 | 2094 | 3087 | 2678 | 1416 | 1007 | |||||||
| 10 | 1220 | 767 | 1805 | 1352 | 2390 | 1937 | 2974 | 2521 | 3560 | 3107 | 1572 | 1119 | |||||
| 11 | 1693 | 1194 | 2278 | 1779 | 2862 | 2364 | 3448 | 2949 | 1730 | 1231 | |||||||
| 12 | 1582 | 1037 | 2167 | 1623 | 2751 | 2207 | 3336 | 2792 | 1887 | 1342 | |||||||
| HPA300SR | 5 | 1097 | 729 | 1061 | 730 | ||||||||||||
| 6 | 935 | 494 | 1316 | 875 | 1273 | 876 | |||||||||||
| 7 | 772 | 258 | 1153 | 639 | 1916 | 1402 | 1485 | 1022 | |||||||||
| 8 | 991 | 403 | 1754 | 1166 | 2517 | 1929 | 1697 | 1168 | |||||||||
| 9 | 1592 | 930 | 2355 | 1693 | 3118 | 2456 | 1909 | 1314 | |||||||||
| 10 | 1430 | 695 | 2193 | 1458 | 2956 | 2221 | 3719 | 2984 | 4482 | 3747 | 2122 | 1460 | |||||
| 11 | 2030 | 1222 | 2793 | 1985 | 3556 | 2748 | 4319 | 3511 | 2334 | 1606 | |||||||
| 12 | 1868 | 986 | 2631 | 1749 | 3394 | 2512 | 4157 | 3275 | 2546 | 1752 | |||||||
| HPA350SR | 5 | 1553 | 964 | 1702 | 1173 | ||||||||||||
| 6 | 1292 | 586 | 1863 | 1157 | 2043 | 1408 | |||||||||||
| 7 | 1031 | 208 | 1602 | 779 | 2745 | 1922 | 2383 | 1642 | |||||||||
| 8 | 1341 | 401 | 2484 | 1544 | 3626 | 2686 | 2724 | 1877 | |||||||||
| 9 | 2224 | 1165 | 3336 | 2307 | 4508 | 3449 | 3064 | 212 | |||||||||
| 10 | 1963 | 787 | 3105 | 1929 | 4247 | 3071 | 5390 | 4214 | 6532 | 5356 | 3405 | 2346 | |||||
| 11 | 2844 | 1551 | 3986 | 2693 | 5129 | 336 | 6271 | 4978 | 3745 | 2581 | |||||||
| 12 | 2584 | 1172 | 3726 | 2314 | 4869 | 3457 | 6011 | 4599 | 4086 | 2816 | |||||||
| HPA400SR | 7 | 2028 | 869 | 2880 | 1837 | ||||||||||||
| 8 | 1736 | 411 | 2550 | 1225 | 3292 | 2100 | |||||||||||
| 9 | 2259 | 768 | 3887 | 2396 | 3703 | 2362 | |||||||||||
| 10 | 1967 | 311 | 3595 | 1939 | 5223 | 3567 | 4115 | 2624 | |||||||||
| 11 | 3303 | 1482 | 4931 | 3110 | 6559 | 4738 | 4526 | 2887 | |||||||||
| 12 | 3012 | 1025 | 4640 | 2653 | 6268 | 4281 | 7895 | 5908 | 9523 | 7536 | 4938 | 3149 | |||||
| 13 | 4348 | 2195 | 5976 | 3823 | 7603 | 5450 | 9231 | 7078 | 5349 | 3412 | |||||||
| 14 | 4057 | 1738 | 5685 | 3366 | 7312 | 4993 | 8940 | 6621 | 5761 | 3674 | |||||||
| 15 | 3765 | 1281 | 5393 | 2909 | 7020 | 4536 | 8648 | 6164 | 6172 | 3937 | |||||||
| 16 | 5101 | 2452 | 6728 | 4078 | 8356 | 5707 | 6584 | 4199 | |||||||||
Ready to Get a Firm Quote for Your Bulk Order?
Send us your target quantity and required delivery timeline. Our team will reply within 24 hours with factory pricing, production lead time, and shipping schedules. Every wholesale order includes:
✓ Standard 15–25 day bulk turnaround for regular models
✓18-month factory warranty
✓ Consistent batch quality with full inspection reports
✓18-month factory warranty
✓ Consistent batch quality with full inspection reports
⚡ Fast 24-hour response for volume orders and custom OEM specs
Dimensions and Mounting
HPA Series 90° Quarter Turn Pneumatic Actuator Outline Dimensional Drawing
HPA Series 90° Quarter Turn Pneumatic Actuator Outline Dimension Table (Unit:mm)
Model | 32 | 40 | 52 | 63 | 75 | 83 | 92 | 105 | 125 | 140 | 160 | 190 | 210 | 240 | 270 | 300 | 350 | 400 |
A(long) | 114 | 122.5 | 147.5 | 169.2 | 182.6 | 210.4 | 262.7 | 270.2 | 299.8 | 392.2 | 456.7 | 523.5 | 539 | 605.8 | 719 | 785 | 920 | 930 |
A(short) | – | – | 153.7 | 172.4 | 188.3 | 215 | 248.5 | 277.5 | 358.3 | 403.6 | 468.4 | 515.5 | 531 | – | – | – | – | – |
B | 47 | 65 | 72.5 | 83 | 95.5 | 103.5 | 108 | 121.5 | 142 | 151 | 174 | 206 | 226 | 260 | 294 | 404 | 457 | 520 |
C | 45 | 60.3 | 72.6 | 88.8 | 100.4 | 109.3 | 117.6 | 135.1 | 156.7 | 174.6 | 199.7 | 232 | 257.5 | 289.5 | 329.5 | 356 | 410 | 463 |
D | 65 | 79.8 | 92.3 | 110.7 | 121 | 128 | 136.2 | 154.5 | 187.6 | 204.7 | 230 | 262 | 287.6 | 319.5 | 365 | 391 | 440 | 493 |
E | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 55 | 55 | 55 | 80 | 80 | 80 | 80 | 80 | 80 | 80 |
HPA Series 120°,135° Quarter Turn Pneumatic Actuator
| Size | HPA052DA | HPA063DA | HPA075DA | HPA083DA | HPA092DA | HPA105DA | HPA125DA | HPA140DA | HPA160DA | HPA190DA | HPA210DA |
| Z(mm) | 213 | 243 | 258 | 298 | 362 | 386 | 429 | 569 | 652 | 756 | 760 |
*For 180° stroke HPA model dimension drawings, please contact Hearken directly.
HPA Series Three Position Quarter Turn Pneumatic Actuator
| Size | HPA052DA | HPA063DA | HPA075DA | HPA083DA | HPA092DA | HPA105DA | HPA125DA | HPA140DA | HPA160DA | HPA190DA | HPA210DA |
| Z(mm) | 266 | 303 | 306 | 336 | 394 | 410 | 456 | 570 | 646 | 788 | 788 |
Connection
Outline Dimension Table (Unit:mm)
Model | 32 | 40 | 52 | 63 | 75 | 83 | 92 | 105 | 125 | 140 | 160 | 190 | 210 | 240 | 270 | 300 | 350 | 400 |
F | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 |
G | 25 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
H | 50 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80/130 | 80/130 | 80/130 | 130 | 130 | 130 | 130 | 130 | 130 | 130 |
J | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
K | 10 | 10 | 10 | 10 | 10 | 10 | 14 | 14 | 22 | 22 | 22 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
L | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 10 | 10 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
M | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 45 | 45 | 45 | 45 |
N | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 40 | 40 | 40 | 40 |
O | G1/8″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/4″ | G1/2″ | G1/2″ | G1/2″ | G1/2″ |
P | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M5x8 | M6x10 | M6x10 | M6x10 | M6x10 |
Q | F03 | F03 | F03 | F05 | F05 | F05 | F05 | F07 | F07 | F10 | F10 | / | / | / | / | / | F16 | F16 |
Q1 | F05 | F05 | F05 | F07 | F07 | F07 | F07 | F10 | F10 | F12 | F12 | F14 | F14 | F16 | F16 | F16 | F25 | F25 |
R | M5x8 | M5x8 | M5x8 | M6x10 | M6x10 | M6x10 | M6x10 | M8x13 | M8x13 | M10x16 | M10x16 | / | / | / | / | / | M20x25 | M20x25 |
R1 | M5x8 | M6x9 | M6x9 | M8x13 | M8x13 | M8x13 | M8x13 | M10x16 | M10x16 | M12x19 | M12x19 | M16x24 | M16x2 | M20x25 | M20x25 | M20x25 | M16x24* | M16x24* |
S | 9×9 | 11×11 | 11×11 | 14×14 | 14×14 | 17×17 | 17×17 | 22×22 | 22×22 | 27×27 | 27×27 | 36×36 | 36×36 | 46×46 | 46×46 | 46×46 | 46×46 | 55×55 |
Interface Specification
 |  |  |  |
| Drive and Flange to ISO 5211 configuration for easy direct mount onto a valve or connection with standardized mounting hardware. | The NAMUR Drive Pinion and NAMUR top mounting connection for direct installation of accessories such as Limit Switch and Positioner. | Air supply connection is designed in accordance w ith NAMUR Standard to install solenoid valve. |
Need CAD Drawings or Help Matching Quarter Turn Actuator to Your Valve?
Get 2D/3D CAD models, interface flange specs, or custom shaft adapters to ensure a perfect fit for your valve.
Purchase Guide
| Step 1: Action Type | Step 2: Torque & Air Pressure |
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| Step 3: Mounting Flange & Shaft Fit | Step 4: Working Temperature & Seals |
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| Step 5: Custom Branding, Colors & Accessories | Need Help Selecting? |
| Not sure about torque sizing, mounting fit, seal materials, temperature range, or accessory integration? Our technical sales team offers free consultation for valve manufacturers and distributors – simply share your valve details, operating conditions, and intended order volume, and we’ll recommend the optimal HPA configuration, verify compatibility, and confirm accessory setup – all before you quote or order. |
HPA Series Quarter Turn Pneumatic Actuator FAQs
Q1: How do I choose the right HPA quarter turn actuators model for my valve?
We size the HPA quarter turn air actuator based on your valve type, size, working pressure, medium, and operating temperature. Our technical team calculates the required torque and applies a 20% to 30% safety factor. For spring-return models, we configure the internal spring quantity to match your air supply.
Q2: Should I choose double-acting or single-acting (spring-return), and what is the smallest size available?
Select single-acting if your system needs a fail-safe position (fail-closed or fail-open) upon air loss. Single-acting models start from size HPA052 up to HPA400. Size HPA040 is only available as double-acting because its cylinder space is too small to fit internal safety springs.
Q3: Can the HPA series quarter turn pneumatic actuator handle special rotation angles or fine stroke adjustments?
Yes. Beyond the standard 90-degree stroke, we supply custom configurations for 120-degree and 180-degree rotations, as well as three-position models. Additionally, all standard HPA end caps feature dual adjustment screws that allow ±5° of fine travel adjustment at both open and closed positions.
Q4: Can 180-degree rotation actuators be made as single-acting (spring return)?
No. 180-degree rotation HPA quarter turn rack and pinion pneumatic actuators are only available as double-acting models. If your system requires a 180-degree stroke, it must be operated with double-acting air control.
Q5: Is the HPA industrial quarter turn pneumatic actuators suitable for low or high temperature environments?
Yes. We offer three standard thermal configurations:
- Standard: -20°C to +80°C (NBR seals)
- Low-Temperature: -50°C to +80°C (special low-temp seals)
- High-Temperature: -15°C to +150°C (FKM/Viton seals)
Q6: Is the bottom mounting connection compatible with my valve, and can it be customized?
Yes. Our mounting interfaces comply with ISO 5211, DIN 3337, and NAMUR standards for direct valve mounting. We can also customize the bottom drive hole to a square shape, double-D, or custom dimensions to fit your valve stem at no extra charge.
Q7: What are the standard air port connection types and operating air pressure?
Our standard stock features G (BSP) threads for the air supply ports. We also provide NPT (FNPT) threads upon request at no extra cost. The default air hose connection is 8mm, and the recommended working air pressure is 2 to 8 bar.
Q8: Do you have magnetic-sensing quarter turn pneumatic actuators, and what accessories are available?
Yes. You can install a magnetic limit switch directly on our HPA quarter turn pneumatic actuator to get open and close position signals. You can also install an APL series limit switch box, solenoid valve, or electro-pneumatic positioner on the top NAMUR shaft. For manual operation when air or power fails, we supply HDM series declutchable gearboxes.
Q9: Do you offer OEM laser branding for wholesale or private-label orders?
Yes. We can laser mark your brand logo, part numbers, and custom serial numbers directly on the quarter turn actuator body or nameplate. During ordering, we will confirm the logo position, flange marking, and text design with you.
Q10: Do you provide pressure testing and quality inspection reports before shipment?
Yes. We perform 100% pressure and tightness testing on all HPA quarter turn pneumatic actuators before packaging. We can provide custom pressure test videos and inspection data sheets upon request for your order verification.
Q11: Can the HPA quarter turn pneumatic actuator mount directly to my valve?
Yes, it can mount directly if your valve has a standard ISO 5211 top flange and a matching stem; for non-standard valves or high-temperature lines (like steam), we provide a bracket and coupler to fit the connection and isolate pipeline heat to protect internal rubber seals and top-mounted accessories.
HPA Series Quarter Turn Pneumatic Actuator Technical Troubleshooting & Maintenance
Q1: Why is the HPA quarter turn pneumatic actuator not moving smoothly or sticking during operation?
A: This is usually caused by unstable air pressure, dirty air supply, or damaged inside gears. First, check if your air supply pressure is stable. If the pressure is fine, turn off the air, release all pressure, open the end caps, and check if the pistons or gears are dirty or damaged.
Q2: The quarter turn pneumatic actuator makes a loud noise when it reaches the end position. How do I fix this?
A: Loud noise at the end of the stroke is usually caused by loose position screws or loose inside plastic bearings. Try turning the actuator on and off a few times under normal air pressure. If the noise continues, adjust the two limit screws on the end caps until the actuator stops quietly at the full open or closed position.
Q3: When we connect a 3/2-way solenoid valve to a single-acting pneumatic actuator, it opens as soon as air is turned on, even without power. Why?
A: This happens when you use a Normally Open (NO) solenoid valve instead of a Normally Closed (NC) valve, or if the air tubes are connected wrong. For normal use, use a Normally Closed 3/2-way valve so air only enters when the solenoid receives power.
Q4: How do we adjust the open and close position on HPA pneumatic actuators if the valve does not close completely?
A: HPA quarter turn pneumatic actuators have two adjustment screws on the end caps. You can adjust the angle by ±5 degrees at both 0 degree (closed) and 90 degree (open) positions. Turn these screws to make the valve disk or ball align correctly.
Q5: How can we make a single-acting pneumatic actuator close slower to avoid water hammer in the pipe?
A: You can install a small speed control valve (flow regulator) on the air exhaust port of the solenoid valve or actuator. Reducing the exhaust air speed will make the spring close the valve slower, which stops water hammer.
Q6: Can HPA quarter turn pneumatic actuators be turned by hand if the air power fails?
A: Standard HPA quarter turn pneumatic actuators do not have a manual handle. If you need manual operation when air or power fails, you need to add a manual gearbox (HDM series) between the actuator and the valve.
Q7: Can we use nitrogen gas (N2) instead of compressed air to run HPA pneumatic actuators?
A: No, do not use nitrogen gas. High-pressure nitrogen drops in temperature very fast when released. The extreme cold can freeze the inside water, harden the rubber O-rings, and make the actuator get stuck. Always use clean, dry compressed air.
Q8: What happens if the air supply hose is too small for the pneumatic quarter turn actuator?
A: If the air hose is too thin or too small, not enough air can pass through. This makes the pneumatic quarter turn actuator move very slow and weak, especially on big models. Always use an air hose that matches the air hole size on the actuator.
[HEARKEN] OEM & WHOLESALE
