HPAC Series Scotch Yoke Pneumatic Actuator

Aluminum scotch yoke actuators engineered for reliable, high-cycle quarter-turn valve control across demanding process pipelines.

Compact scotch yoke actuator with NAMUR air ports

ISO 5211 mounting flange on double acting scotch yoke actuator

Fail-safe single acting scotch yoke rotary actuator

HPAC spring return scotch yoke pneumatic actuator

ISO 5211 valve connection on spring return scotch yoke actuator

HPAC Series Scotch Yoke Pneumatic Actuator

Output Torque: DA: 8 – 13,619 Nm | SR: Up to 9,155 Nm
Operating Pressure: 2.5 – 8.0 bar (36 – 116 psi)
Rotation Angle: 90° (±3°)
Mounting Standards: ISO 5211 (F03–F25) & NAMUR VDI/VDE 3845
Operating Speed: Rapid stroke from 0.1 s to 9.8 s (depending on model size and load)
Operating Media: Clean, dry, or lubricated compressed air / non-corrosive gases (filtered to ≤40 µm)
Temperature Rating: Standard: -20°C to +80°C | Low Temp: -50°C to +80°C | High Temp: -15°C to +150°C
Housing Material: Hard Anodized Extruded Aluminum Alloy (>20 μm)
Certificates: ISO 9001, SIL 3, ATEX, CE, IP67

Custom Actuator Housing Color

We customize scotch yoke 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 scotch yoke 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 scotch yoke 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

Technical Specifications

Dimensions

Purchase Guide

Description of HPAC Series Scotch Yoke Pneumatic Actuator

The Hearken HPAC Series is an extruded aluminum scotch yoke pneumatic actuator designed for quarter-turn ball, butterfly, and plug valves. It packages high end-position seating torque and vibration resistance into a compact, low-weight profile, delivering reliable, energy-efficient performance for high-cycle automated valve service.

Specifications & Features

1. Peak Torque at 0° and 90°

Outputs maximum force at the start and end of every cycle. This high seating torque cuts through line pressure and sediment buildup, ensuring tight shutoff without valve sticking.

2. Long Service Life
Durable bushings and multi-point guides keep the piston moving straight with minimal friction. This protects the seals and allows smooth operation tested to over 1,000,000 cycles.

3. 30% Smaller Size & Lighter Weight
The high-torque scotch yoke design makes the actuator up to 30% smaller and lighter than a rack and pinion model with the same output. It takes up less space and puts less weight on piping.

4. Low Compressed Air Consumption
Sizing with a smaller cylinder significantly cuts the air volume needed per stroke, reducing overall demand and pressure drops across the air supply system.

5. Faster Operating Speed
HPAC scotch yoke actuator compared to rack and pinion actuators of the same torque rating, the smaller cylinder bore fills and exhausts air significantly faster, accelerating overall valve response.

6. Precise Fit for Accurate Flow Control
Precision-machined yoke and roller parts fit tightly with zero loose play. This ensures accurate valve positioning when used with valve positioners for throttling service.

HPAC Series scotch yoke pneumatic actuator internal cutaway view showing double acting (top) and single acting spring return (bottom) mechanisms

Looking for Reliable Seating Torque and Long Cycle Life?

Match your valve’s exact opening and closing requirements with precision scotch yoke actuation.

Operating Principle: Scotch Yoke vs. Rack & Pinion

Unlike rack-and-pinion actuators with fixed moment arms and flat torque output, the HPAC uses a precision roller-driven scotch yoke mechanism. As the pistons move linearly, the effective moment arm lengthens at the 0° and 90° positions, producing a U-shaped torque curve.

This mechanical curve concentrates force at the valve breakaway and shutoff positions, keeping the actuator compact while ensuring reliable seating under full line pressure.

Scotch yoke vs rack and pinion pneumatic actuator mechanical torque principle diagram

Internal Construction & Components

1. Modular Spring Pack	2. Corrosion-Resistant Fasteners	3. Piston Guide Ring
Different spring sets match different air pressures. The low-stress spring design gives the springs a much longer working life.	All bolts are made of stainless steel to stop rust and corrosion.	The piston guide ring is made of high-grade polymer. It has very low friction, high hardness, and great wear resistance for smooth movement and long service life.
4. Cylinder Body	5. Shaft Bushing	6. Piston Bushing
The housing is precision-machined and hard-anodized with a coating over 20 µm thick. It resists wear, stops corrosion, and keeps friction low.	Stops metal contact between the shaft and housing. It keeps the drive shaft lined up, cuts friction, and helps the compact pneumatic actuator run smoothly.	Multiple guide bushings keep the piston straight and centered. This stops tilting and greatly extends the life of the piston seals.
7. Scotch Yoke	8. Piston Pin & Roller	9. Mounting Standards	10. Shaft Seal	11. Pin Connection	12. Integrated Handwheel
High-strength alloy steel yoke with special surface hardening to resist heavy torque loads and reduce dynamic wear.	Made of high-strength alloy steel with surface hardening to reduce dynamic wear and extend service life.	Fits standard ISO 5211, DIN 3337, and NAMUR VDI/VDE 3845 dimensions.	Easy-to-replace design that you can change without removing the drive shaft.	The yoke and drive shaft lock together with pins to turn at the same time. The pins also stop the shaft from blowing out for safe, reliable operation.	The handwheel is built right into the actuator. It saves installation space, keeps the size small, and cuts weight on the pipeline.

Available Configurations

HPAC double acting pneumatic actuator with flat end caps and visual position indicator

HPAC single acting scotch yoke pneumatic actuator with extended spring end caps and ISO 5211 female drive

HPAC pneumatic actuator with integrated manual handwheel override and NAMUR air ports

Double Acting Scotch Yoke Actuator (HPAC-DA)

Single Acting / Spring Return Scotch Yoke Actuator (HPAC-SR)

Scotch Yoke Actuator With Integrated Handwheel (HPAC-DA/SR-HW)

Drive Type: Air to open, air to close (bi-directional pneumatic operation, no internal springs).

Advantage: Uses air to open and air to close. It delivers smooth, equal power in both directions for reliable valve operation.

Application: General industrial pipelines, cooling lines, water treatment, and standard automated on/off process systems.

Drive Type: Air-powered stroke with mechanical spring-return safety action.

Advantage: Pre-compressed, modular spring cartridges let you easily adjust spring sets for 2.5 to 8 bar air supplies or change between Fail-to-Close and Fail-to-Open in your shop without hydraulic presses or dangerous spring handling.

Application: Emergency shutdown (ESD), hazardous chemical feed lines, fuel gas piping, and critical safety isolation loops.

Drive Type: Quarter-turn scotch yoke actuator with a built-in manual handwheel.

Advantage: The built-in handwheel removes the need for extra gearboxes, brackets, and drive shafts. This compact design saves space, lowers total weight, and makes valve assembly faster and easier in your shop.

Application: Valve pressure testing, factory setup, on-site startup, and emergency manual operation if air supply is lost.

Customization Options

Anti-Corrosion Painting
HPAC scotch yoke actuators can be ordered with ISO 12944 C5 paint systems. We apply at least 3 protective layers (epoxy primer, intermediate coat, and polyurethane or PTFE topcoat) for service in salt spray, seawater, and harsh chemical environments.

End Caps
End caps can be customized in red, yellow, black, and other colors upon request.
Custom Colors
Available in red, black, gold, and other custom colors upon request to fit your OEM branding needs.

Fast-Acting Stroke Speed
We provide custom stroke speed engineering to meet your operational requirements. For example, high-torque configurations (such as 4,000 Nm models) can be engineered for full open or close cycles in under 1 second. Ideal for Emergency Shutdown (ESD) and rapid isolation valves.
Private Labeling & Custom Nameplates
We support full OEM private labeling. Options include stainless steel nameplates, plastic tags, or adhesive stickers printed with your own company logo, custom model number, torque ratings, and serial codes.
Accessories
You can add NAMUR solenoid valves, limit switch boxes, filter regulators, or positioners to your order. Upon request, we can mount and calibrate them directly onto HPAC scotch yoke pneumatic actuators before shipment, saving your team extra shop assembly time.
Spare Part Kits
Pre-packaged seal kits are available for plant stocking and routine long-term maintenance. Each kit includes standard O-rings, wear bands, and circlips for fast, on-site servicing if needed.

Looking for Factory-Direct OEM Supply & Custom Branding?

Tailor HPAC 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

⚡ 24-hour response for OEM specs & volume quotes

Materials and Component

Exploded diagram of HPAC scotch yoke pneumatic actuator components and spare parts

S/N	Description	Material	S/N	Description	Material
1	Cylinder	Aluminium Alloy	18	Piston ring	Engineering Plastics
2	Piston	Aluminium Alloy	19	Piston O-ring	NBR
3	Shaft	Alloy Steel	20	Piston support chip	Engineering Plastics
4	Yoke	Alloy Steel	21	Connection plate O-ring	NBR
5	Piston pin	Alloy Steel	22	Connection plate	Aluminium Alloy
6	Yoke pin	Alloy Steel	23	Plate socket screw	Stainless Steel
7	Bearing	Alloy Steel	24	Cover socket screw	Stainless Steel
8	Upper circlip	Stainless Steel	25	Nut O-ring	NBR
9	Lower circlip	Stainless Steel	26	Screws	Stainless Steel
10	Upper washer	Engineering Plastics	27	End Cover Seal Ring	NBR
11	Lower washer	Engineering Plastics
12	Upper shaft O-ring	NBR	101	Cover	Aluminium Alloy
13	Lower shaft O-ring	NBR	102	Spring	Spring Steels
14	Upper shaft bearing	POM/Graphite Copper Bushing	103	Lower Spring Washer	Aluminium Alloy
15	Lower shaft bearing	POM/Graphite Copper Bushing	104	Spring Shaft	Stainless Steel
16	Upper piston bearing	Engineering Plastics	201	Double Acting End Cover	Aluminium Alloy
17	Lower piston bearing	Engineering Plastics	202	Set Screw	Stainless Steel

Hearken HPAC Series Scotch Yoke Pneumatic Actuator Manufacturing & Quality Control Process


Step 1: Precision CNC Machining	Step 2: 3D CMM Dimensional Inspection	Step 3: Spring Strength & Load Testing	Step 4: Assembly & Dynamic Torque Testing
HPAC scotch yoke actuator bodies, end covers, and internal yokes are machined on multi-axis CNC centers to maintain close dimensional tolerances and internal bore finishes.	Bore roundness, drive shaft concentricity, and ISO 5211 mounting bolt circles are verified on a 3D CMM to ensure precise fit before actuator assembly.	High-tensile springs for single-acting HPAC scotch yoke actuators undergo compression testing to confirm design return force and prevent premature fatigue.	Following cleanroom assembly and lubrication, fully assembled HPAC pneumatic actuators are tested on digital torque benches to record breakaway, run, and end-stroke torque across specified operating pressures.

Step 5: Shell Pressure & Leak Testing	Step 6: Duty Cycle Endurance Testing	Step 7: Factory Test Report (FAT / MTR)	Step 8: Export Protection & Crating
HPAC scotch yoke actuators undergo proof-pressure and seat-leak tests inside a steel safety cage using pneumatic and hydrostatic media to confirm bubble-tight sealing.	HPAC scotch yoke pneumatic actuators run through automated open-close cycling under load to confirm stroke repeatability, speed consistency, and end-stop mechanical integrity.	We supply Factory Acceptance Test (FAT) records—documenting torque curves, stroke speeds, and pressure test hold times—alongside raw material test reports (EN 10204 3.1).	Standard models (HPAC040–HPAC160) are packed in individual inner cartons before crating; large models (HPAC180+) and all HPAC actuators with side-mounted manual override handwheels (-HW) are secured directly inside export plywood crates using heavy-duty foam-in-place cushioning.

Compatible Valve Configurations

Valve Type	Why Use HPAC Scotch Yoke Actuators
Ball Valves	Matches Seating & Unseating Torque Profile
	Ball valves need maximum torque at fully closed (0°) and open (90°) positions. The HPAC scotch yoke mechanism delivers its highest torque at both ends of travel, preventing valve jamming under full differential pressure.
Butterfly Valves	Overcomes Tight Seat Friction Without Oversizing
	Overcomes the high initial friction of rubber sleeves and metal-seated discs without twisting the stem. You can use a smaller HPAC actuator size compared to standard rack-and-pinion models.
Plug Valves	Exact Port Alignment Prevents Seat Erosion
	Quarter-turn plug valves require precise angle stops to prevent media wash. Dual ±5° travel stop screws ensure the plug bore lines up exactly with the pipeline flow.
Dampers & Louvers	Low-Weight Mounting for Thin Ventilation Ducts
	The extruded aluminum body cuts total topworks weight on HVAC and exhaust duct walls, delivering fast and responsive air throttling without heavy pipe supports.

Industry Applications For HPAC Series Scotch Yoke Pneumatic Actuator

HPAC extruded aluminum scotch yoke actuators deliver the high breakout and seating force quarter-turn equipment requires under heavy differential pressures. Engineered for demanding industrial duties—including heavy mechanical shock, continuous 24/7 cycling, and dusty outdoor lines—these compact scotch yoke actuators power quarter-turn valves across core processing sectors:

Chemical & Petrochemical Systems	Pharmaceutical & Clean Processing	Water Treatment & Membrane Filtration
Mounts to reactor feed lines, pump piping, and tank storage lines. Double-acting scotch yoke actuators control daily flow rates, while spring-return aluminum scotch yoke pneumatic actuators provide fail-safe emergency shutdown (ESD) on hazardous chemical lines.	Automates sanitary ball valves and tank-bottom drain valves on clean-in-place (CIP) and sterile batch tanks. If electrical power or air supply drops, single-acting HPAC scotch yoke actuators snap the valve shut to prevent fluid loss and cross-contamination.	Operates large-size butterfly valves in municipal treatment plants, water intake stations, and membrane backwash skids. The quarter-turn scotch yoke actuator mechanism handles continuous open-close cycles with low mechanical wear.
PSA Gas Plants (Oxygen & Nitrogen Generators)	HVAC & Exhaust Air Control	Bulk Dry Powder Handling & Transport
Runs continuous 24/7 fast valve cycles on Pressure Swing Adsorption (PSA) skids. Double-acting compact scotch yoke pneumatic actuators handle fast valve travel during rapid pressure shifts without air leakage.	Controls air dampers and fume valves in factory ventilation ducts and cleanrooms. Double-acting scotch yoke actuators connect to 4–20 mA positioners for precise air flow balance, while spring-return models snap closed during fire or smoke alarms.	Operates bottom discharge valves on dry-bulk powder road tankers, bagging machines, and pneumatic pipe systems. The aluminum scotch yoke actuator housing handles dusty worksites and vehicle vibration during transport.

Sourcing Scotch Yoke Actuators at Wholesale?

Expand your inventory with factory-direct pricing, 15–25 day batch delivery, and custom private labeling.

Technical Specifications

HPAC Series Scotch Yoke Pneumatic Actuator Double Acting – DA Torque Table

Pressure Model	3bar			4bar			5bar			5.6bar			6bar			7bar			8bar
Model	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°	α=0°	α=45°	α=90°
DA40	15	8	12	20	10	16	25	13	20	28	14	22	30	15	24	35	18	28	40	20	32
DA60	44	23	36	59	30	48	74	38	60	83	42	68	89	45	72	104	53	84	118	60	96
DA70	86	44	70	114	58	93	143	73	116	160	81	130	171	87	140	200	102	163	228	116	186
DA80	138	70	113	184	94	150	230	117	188	258	131	210	276	141	225	322	164	263	368	188	300
DA90	206	105	168	274	140	224	343	175	280	384	196	313	412	210	336	480	245	392	549	280	448
DA100	303	154	247	404	206	329	505	257	411	565	288	461	605	309	494	706	360	576	807	411	658
DA125	494	252	403	659	336	537	823	420	671	922	470	752	988	504	806	1153	588	940	1317	672	1074
DA140	690	352	563	920	469	750	1150	586	938	1288	657	1050	1380	704	1125	1610	821	1313	1840	938	1501
DA160	1044	532	851	1392	709	1135	1740	887	1418	1948	993	1589	2088	1064	1702	2435	1241	1986	2783	1419	2269
DA180	1486	742	1187	1941	989	1583	2426	1237	1978	2718	1385	2216	2912	1484	2374	3397	1731	2770	3882	1979	3165
DA220	2485	1299	1878	3314	1732	2504	4142	2165	3130	4639	2425	3506	4971	2598	3756	5799	3031	4382	6627	3464	5008
DA260	5107	2669	3859	6810	3559	5146	8512	4449	6432	9534	4983	7204	10215	5339	7719	1191	6228	9005	13619	7118	10292

HPAC Series Scotch Yoke Pneumatic Actuator Single Acting – SR Torque Table

Model	Spring	Spring Torque Nm 0°45°90°			Torque output under different pressure Nm 0° 45° 90°
					2,5 bar/36psi			3,0 bar/44psi			4,0 bar/58psi			5,0 bar/73psi			5,5 bar /80psi			6,0 bar/87psi			7,0 bar /102psi			8,0 bar/116psi
					0°	45°	90°	0°	45°	90°	0°	45°	90°	0°	45°	90°	0°	45°	90°	0°	45°	90°	0°	45°	90°	0°	45°	90°
SR60	K11	14	10	19	19	8	10	26	12	15	38	19	26
SR60	K12	18	13	25				22	9	10	34	16	21	47	23	32
SR60	K22	22	16	31							30	13	15	43	20	26	49	23	32
SR60	K13	25	18	34										41	18	23	47	22	29	53	25	34
SR60	K23	29	21	40													43	19	23	50	22	29	62	29	40
SR60	K33	36	26	50																43	18	20	56	25	31	69	32	42
SR70	K11	26	18	36	38	16	19	50	23	30	74	36	51
SR70	K12	34	24	47				43	18	19	67	31	41	91	44	62
SR70	K22	42	30	59							60	26	30	84	39	51	96	45	62
SR70	K13	47	34	65										80	36	45	92	42	56	104	49	66
SR70	K23	55	39	77													85	37	45	97	44	56	121	57	77
SR70	K33	68	49	95																85	35	39	110	49	60	134	62	82
SR80	K11	42	29	56	60	27	33	80	37	50	119	59	84
SR80	K12	57	39	74				67	29	33	106	50	68	146	71	102
SR80	K22	71	49	92							93	41	51	133	63	85	152	73	103
SR80	K13	78	54	103										127	58	76	146	69	93	166	79	110
SR80	K23	92	63	120													133	60	76	156	71	98	192	92	128
SR80	K33	114	78	149																134	57	67	173	79	101	213	100	135
SR90	K11	68	48	91	85	36	42	114	52	68	173	84	119
SR90	K12	87	61	117				98	40	44	156	72	95	215	104	146
SR90	K22	105	74	142							140	60	71	198	92	122	228	108	148
SR90	K13	121	85	162										184	82	104	213	98	129	243	114	155
SR90	K23	140	98	188													197	86	105	226	102	131	285	134	182
SR90	K33	174	122	234																195	80	88	254	112	139	313	144	190
SR100	K11	92	64	122	132	59	74	176	82	111	262	129	187
SR100	K12	122	85	162				149	63	74	235	110	149	321	157	225
SR100	K22	152	106	202							208	91	112	294	138	187	337	162	225
SR100	K13	168	117	223										280	128	167	323	151	205	366	175	243
SR100	K23	198	137	263													296	132	168	339	156	205	425	203	281
SR100	K33	244	169	324																297	127	148	383	174	223	470	220	299
SR125	K11	158	109	209	227	101	126	301	141	190	448	221	319
SR125	K12	208	144	275				256	109	129	403	190	257	551	270	386
SR125	K22	257	178	341							358	158	195	506	238	324	580	278	389
SR125	K13	286	199	379										480	220	288	554	260	352	627	300	417
SR125	K23	336	233	445													509	229	291	583	269	355	730	349	484
SR125	K33	415	288	550																511	219	257	659	299	386	807	379	515
SR140	K11	214	148	281	298	132	165	397	186	251	594	293	423
SR140	K12	275	190	362				342	147	176	538	254	347	735	361	519
SR140	K22	337	232	442							483	216	272	680	323	443	778	376	529
SR140	K13	383	264	502										638	294	387	737	347	473	835	401	558
SR140	K23	444	306	583													682	309	397	780	362	483	977	469	655
SR140	K33	551	380	723																683	295	351	880	402	523	1077	509	694
SR160	K11	323	223	425	452	201	250	601	281	380	899	443	639
SR160	K12	408	282	536				525	228	275	822	390	535	1120	551	794
SR160	K22	493	340	648							746	337	431	1043	498	690	1192	579	820
SR160	K13	569	393	749										974	450	595	1123	530	725	1271	611	854
SR160	K23	654	452	860													1046	477	620	1195	558	750	1492	720	1010
SR160	K33	816	563	1073																1049	456	551	1347	618	810	1644	779	1070
SR180	K11	408	305	593	630	279	348	837	392	529	1252	617	891
SR180	K12	524	392	763				721	311	370	1137	536	732	1552	762	1094
SR180	K22	639	479	933							1021	456	573	1436	681	935	1643	794	1116
SR180	K13	728	544	1060										1348	620	816	1555	733	997	1763	845	1178
SR180	K23	843	631	1230													1439	652	838	1647	764	1019	2062	990	1380
SR180	K33	1047	783	1526																1443	622	740	1858	848	1102	2273	1073	1464
SR220	K11	708	531	1035	1215	550	706	1599	759	1042	2369	1176	1712
SR220	K12	945	709	1383				1363	593	715	2132	1010	1386	2901	1428	2057
SR220	K22	1182	887	1732							1895	844	1060	2664	1262	1730	3049	1471	2066
SR220	K13	1299	974	1901										2547	1181	1572	2932	1390	1907	3316	1599	2242
SR220	K23	1536	1152	2249													2695	1224	1580	3080	1433	1916	3849	1850	2587
SR220	K33	1890	1417	2767																2725	1185	1431	3495	1603	2101	4264	2021	2772
SR260	K11	1187	1046	2235	2765	1171	1351	3555	1600	2040	5136	2459	3418
SR260	K12	1746	1406	2865				2997	1265	1449	4578	2123	2827	6158	2981	4206
SR260	K22	2304	1766	3496							4019	1787	2236	5600	2646	3615	6390	3075	4304
SR260	K13	2339	1929	3983										5565	2494	3158	6355	2923	3847	7146	3352	4536
SR260	K23	2898	2289	4613													5797	2588	3256	6587	3017	3945	8168	3875	5324
SR260	K33	3492	2812	5730																5993	2529	2898	7574	3388	4276	9155	4246	5654

FC selection : Spring 0°-ETC, Spring 45°-RTC, Spring 90°-BTC; Pressure 0°-BTOPressure 45°-RTO, Pressure 90°-ETO

FO selection: Spring 0°-ETO, Spring 45°-RTO, Spring 90°-BTO; Pressure 0°-BTC ,Pressure 45°-RTC, Pressure 90°-ETC

Need Help Sizing HPAC scotch yoke actuators for Your Valve Specifications?

Send us your valve operating torque, media conditions, and available air pressure. Our engineering team will calculate the exact torque profile and recommend the most cost-effective actuator model.

✓ Optimized safety margin calculation
✓ Custom spring sets (K11–K33) matched to your air supply
✓ 15–25 day factory lead time

⚡ Sizing recommendation and factory quote within 24 hours

Dimension

HPAC Series Scotch Yoke Pneumatic Actuator – Double Acting Dimension

Dimension and coding – DA140-DA160

HPAC-DA 140-160 double acting pneumatic actuator drawing

Model	DA140		DA160
ISO	F12/F16	F14	F12/F16	F14
A	520		575
B	36		46
C	40		46
D x Depth	M12x20	M16x24	M12x20	M16x24
E x Depth	M20x30	–	M20x30	–
F	125	140	125	140
G	165	–	165	–
H	220		242.5
I	122		129
J	30		30
K	156.5		175
L	75		85
M	79		93.5
Weight (Kg)	20.05		27.7
Air consumption (NL/Cycle)	7.5		11.1
Open time (seconds)	2		3.6
Close time (seconds)	2.2		3.4

Dimension and coding – DA180-DA260

HPAC-DA 180-260 double acting actuator with gearbox handwheel drawing

Model	DA180		DA220	DA260
ISO	F12/F16	F14	F16	F25
A	656		810	1005
B	46		55	55
C	50		57	57
D x Depth	M12x18	M16x24	M20x30	M16x30
E x Depth	M20x30	–	–	–
F	125	140	165	254
G	165	–	–	–
H	275		314	380
I	148		171	202
J	30		30	30
K	62		71	66
L	206		271	342
M	168		200	300
Weight (Kg)	37.45		65.5	114
Air consumption (NL/Cycle)	16.58		29.8	62.1
Open time (seconds)	4.4		3.8	6.7
Close time (seconds)	4.3		4.3	7

HPAC Series Scotch Yoke Pneumatic Actuator – Single Acting Dimension

Dimension and coding – SR60-SR125

HPAC-SR 060-125 spring return actuator with NAMUR plate dimensions

Model	SR60	SR70	SR80	SR90	SR100	SR125
ISO	F05	F05/F07	F05/F07	F07/F10	F07/F10	F10/F12
A	310	410	457	510	596	720
B	14	17	17	22	22	27
C	16	18	22	26	26	30
D x Depth	M6x9	M6x9	M6x9	M8x12	M8x12	M10x15
E x Depth	–	M8x12	M8x12	M10x15	M10x15	M12x18
F	50	50	50	70	70	102
G	–	70	70	102	102	125
H	97	111	128	140	149	186
I	57	65	72	76	83	106
J	20	20	20	20	20	30
K	80	96	108	121	131	156
L	31.5	40	45.5	51	57	70
M	43	46	53	54.5	59	60
Weight (Kg)	2.1	4.1	5.9	8.9	12.3	20.8
Consumption (NL/Cycle)	0.28	0.6	0.95	1.44	1.97	3.41
Open time (seconds)	0.29	0.34	0.5	0.78	1.05	1.8
Close time (seconds)	0.25	0.31	0.46	0.65	0.82	1.18

Dimension and coding – SR140-SR160

HPAC-SR 140-160 spring return actuator dimensions

Model	SR140		SR160
ISO	F12/F16	F14	F12/F16	F14
A	780		880
B	36		46
C	40		46
D x Depth	M12x20	M16x24	M12x20	M16x24
E x Depth	M20x30	–	M20x30	–
F	125	140	125	140
G	165	–	165	–
H	220		242.5
I	122		129
J	30		30
K	156.5		175
L	75		85
M	79		93.5
Weight (Kg)	32.1		47.6
Air consumption (NL/Cycle)	4.51		6.49
Open time (seconds)	2.51		4.14
Close time (seconds)	1.68		2.47

Dimension and coding – SR180-SR260

HPAC-SR 180-260 large spring return actuator drawing

Model	SR180		SR220	SR260
ISO	F12/F16	F14	F16	F25
A	965		1199	1543
B	46		55	55
C	50		57	57
D x Depth	M12x18	M16x24	M20x30	M16x30
E x Depth	M20x30	–	–	–
F	125	140	165	254
G	165	–	–	–
H	275		314	380
I	148		171	202
J	30		30	30
K	62		71	66
L	206		271	342
M	168		206	300
Weight (Kg)	60.1		108.7	211.9
Air consumption (NL/Cycle)	10.22		17.6	36.4
Open time (seconds)	9.6		4.92	9.82
Close time (seconds)	6.07		3.11	6.2

Open time test：
HPAC (40 -1 80) DA /SR: Entry G1/4 , φ8 mm air tube, empty load
HPAC (220 -260）) DA /SR: Entry G1/2 , φ12 mm air tube, empty load

HPAC Series Scotch Yoke Pneumatic Actuator – with Manual Override (HW)

Dimension and coding – HPAC070DA-HW~HPAC160DA-HW

HPAC-DA 070-160 double acting actuator with handwheel dimensions

Model	HPAC070DA-HW	HPAC080DA-HW	HPAC090DA-HW	HPAC100DA-HW	HPAC125DA-HW	HPAC140DA-HW	HPAC160DA-HW
A	418	478	571	629	752	834	968
B	17	17	22	22	27	36	46
C	18	22	26	26	30	40	46
D	311	357	425	469	565	612	729
E	Ø50 F05	Ø50 F05	Ø70 F07	Ø70 F07	Ø102 F10	Ø125 F12	Ø125 F12
F	Ø70 F07	Ø70 F07	Ø102 F10	Ø102 F10	Ø125 F12	Ø165 F16	Ø165 F16
G	M6*9	M6*9	M8*12	M8*12	M10*15	M12*20	M12*20
H	M8*12	M8*12	M10*15	M10*15	M12*18	M20*30	M20*30
I	Ø200	Ø200	Ø250	Ø250	Ø315	Ø400	Ø400
J	111	128	139	148	186	220	242
K	20	20	20	20	30	30	30
L	47	56	63	66	80	99	113
M	100	108	120	131	155	156	176
N	40	46	52	57	69	75	86

HPAC140DA-HW, HPAC160DA-HW, φ140 F14 (M16*24) connection size selectable

Dimension and coding-HPAC180 DA-HW~HPAC260 DA-HW

HPAC-DA 180-260 double acting actuator with gearbox handwheel drawing

Model	HPAC180DA-HW	HPAC220DA-HW	HPAC260DA-HW
A	1097	1372	1715
B	46	55	55
C	50	57	57
D	Φ125 F12	Φ165 F16	Φ254 F25
E	Φ165 F16	—	—
F	M12*18	M20*30	M16*30
G	M20*30	—	—
H	275	314	380
I	148	171	202
J	472	526	575
K	101	142	173
L	265	271	296
M	Φ400	Φ500	Φ600

HPAC180DA-HW, φ140 F14(M16*24) connection size selectable

Dimension and coding – HPAC070SR-HW~HPAC160SR-HW

HPAC-SR 070-160 spring return actuator with handwheel dimensions

Model	HPAC070SR-HW	HPAC080SR-HW	HPAC090SR-HW	HPAC100SR-HW	HPAC125SR-HW	HPAC140SR-HW	HPAC160SR-HW
A	472	552	652	731	882	960	1113
B	17	17	22	22	27	36	46
C	18	22	26	26	30	40	46
D	374	432	506	571	694	739	874
E	Φ50 F05	Φ50 F05	Φ70 F07	Φ70 F07	Φ102 F10	Φ125 F12	Φ125 F12
F	Φ70 F07	Φ70 F07	Φ102 F10	Φ102 F10	Φ125 F12	Φ165 F16	Φ165 F16
G	M6*9	M6*9	M8*12	M8*12	M10*15	M12*20	M12*20
H	M8*12	M8*12	M10*15	M10*15	M12*18	M20*30	M20*30
I	Φ200	Φ200	Φ250	Φ250	Φ315	Φ400	Φ400
J	111	128	139	148	186	220	242
K	20	20	20	20	30	30	30
L	47	56	63	66	80	99	113
M	100	108	120	131	155	156	176
N	40	46	52	57	69	75	86

HPAC140SR-HW、 HPAC160SR-HW, φ140 F14(M16*24) connection size selectable

Dimension and coding – HPAC180SR-HW~HPAC260SR-HW

HPAC-SR 180-260 spring return actuator with gearbox handwheel drawing

Model	HPAC180SR-HW	HPAC220SR-HW	HPAC260SR-HW
A	1250	1555	1972
B	46	55	55
C	50	57	57
D	Φ125 F12	Φ165 F16	Φ254 F25
E	Φ165 F16	—	—
F	M12*18	M20*30	M16*30
G	M20*30	—	—
H	275	314	380
I	148	171	202
J	472	526	575
K	101	142	173
L	265	271	296
M	Φ400	Φ500	Φ600

HPAC180SR-HW, φ140 F14 (M16*24) connection size selectable

Connection

Centering Ring	Star Drive Shaft	Hole Pattern	Adjustment
Standardized to ISO 5211 and DIN 3337 dimensions.	Machined to international ISO 5211 and DIN 3337 standards for square-section valve stems.	Compliant with ISO 5211 and DIN 3337 international mounting patterns.	Dual external travel stops for precise setting of end-position angles.

Integrating HPAC Scotch Yoke Pneumatic Actuators into Your Valve Assemblies?

Direct factory support for 2D/3D CAD models, topworks mounting drawings, and sizing sheets.

Purchase Guide

Follow this 4-step engineering checklist to size the right HPAC scotch yoke pneumatic actuator or request a factory quote:

Step 1: Valve Operating Torque & Safety Margins

Calculate the required actuator target torque by applying an application safety factor to the valve manufacturer’s rated breakaway torque:

Target Torque = Rated Valve Torque × Safety Factor

Clean Liquid & Lubricated Media: Valve torque × 1.20 – 1.25 (+20% to +25% safety margin)
Applicable to clean water, hydraulic oil, lubricated gases, and lightweight ventilation dampers.
Dry Gas, Saturated Steam & Non-Lubricating Media: Valve torque × 1.30 – 1.35 (+30% to +35% safety margin)
Slurries, Viscous Media, Powders & Heavy Dampers: Valve torque × 1.40 – 1.50 (+40% to +50% safety margin)
Ball Valves (Recommended Standard): Add a +50% default safety margin (× 1.50) to prevent actuator stalling caused by seat breakout friction after prolonged idle periods.

Step 2: Dynamic Torque Matching by Valve Type

Match your calculated Target Torque against the HPAC dynamic torque output values across start, run, and end-stroke positions:

Butterfly Valves:
- Double-Acting (DA): 0° BTO (Break-to-Open) ≥ Target Torque
- Single-Acting Fail-Close (SR-FC): 0° Spring ETC ≥ Target Torque; 0° Air BTO ≥ Target Torque
- Single-Acting Fail-Open (SR-FO): 90° Air ETC ≥ Target Torque; 90° Spring BTO ≥ Target Torque
Ball Valves & Segmented Ball Valves:
- Double-Acting (DA): 90° BTC (Break-to-Close) ≥ Target Torque
- Single-Acting Fail-Close (SR-FC): 0° Spring ETC ≥ Target Torque and 0° Air BTO ≥ Target Torque; 90° Air ETO ≥ 70% × Target Torque
- Single-Acting Fail-Open (SR-FO): 90° Spring BTO ≥ Target Torque and 90° Air ETC ≥ Target Torque; 0° Spring ETO ≥ 70% × Target Torque
Continuous-Torque Equipment (Plug Valves, Louver Dampers, Diverter Gates):
Check both end positions (0° and 90°) as well as mid-stroke (45°) running torque to ensure 45° Run Torque ≥ 75% × Target Torque.
- Double-Acting (DA): 0° BTO ≥ Target Torque and 90° BTC ≥ Target Torque; 45° Run Torque (RTO / RTC) ≥ 75% × Target Torque
- Single-Acting Fail-Close (SR-FC):
  - Opening Stroke: 90° Air ETO ≥ Target Torque; 45° Air RTO ≥ 75% × Target Torque
  - Closing Stroke: 0° Spring ETC ≥ Target Torque; 45° Spring RTC ≥ 75% × Target Torque
- Single-Acting Fail-Open (SR-FO):
  - Closing Stroke: 90° Air ETC ≥ Target Torque; 45° Air RTC ≥ 75% × Target Torque
  - Opening Stroke: 0° Spring ETO ≥ Target Torque; 45° Spring RTO ≥ 75% × Target Torque

Step 3: Operating Temperatures & Installation Setup

Direct Mounting (Media below 80°C): Mounts directly onto ISO 5211 valve topworks without brackets.

Elevated Bracket Mounting (Hot Media above 100°C): Install an elevated bracket and stem extension to isolate the actuator pneumatic housing from thermal line transfer.

Ambient Site Temperatures:

Standard (-20°C to +80°C): Standard NBR O-rings and general-purpose grease.
Low-Temp (-50°C to +80°C): Low-temperature silicone seals with arctic synthetic grease.
High-Temp (-15°C to +150°C): FKM (Viton) seals with high-temperature lubricant.

Step 4: Topworks & Stem Interface

Flange & Drive Verification: Match the valve flange to the actuator ISO 5211 pattern (F03 through F25).

Stem Coupling: Ensure valve stem dimensions align directly with the female double-square (star drive) output shaft, or select standard reduction drive sleeves for smaller stem diameters.

Need Valve Sizing or Torque Calculation Support?

Send us your valve data and air pressure specs—we will verify the exact model.

HPAC Direct Interchange & Replacement Table (Double-Acting)

Find drop-in HPAC equivalents for standard Rotork, Omal, Actuatech, Ebro, and Kosaplus actuators. All models share standardized ISO 5211 mounting interfaces and provide equal or higher start torque:

Hearken HPAC Alternative	HPAC Output Torque (DA @ 5.6 bar)	Rotork (RC200 Series)	Omal (DA / DAN Series)	Actuatech (GD Series)	Ebro (EB-SYD Series)	Kosaplus (AD Series)	ISO 5211 Mount (HPAC)
HPAC040DA	28 Nm	–	DA 08	GD 08	EB 4.1	–	F03 / F05
			DAN 15	GD 15
HPAC060DA	83 Nm	RC210	DAN 30	GD 30	EB 5.1	AD50	F05 / F07
		RC220	DAN 45	GD 45
			DAN 60	GD 60
HPAC070DA	160 Nm	RC230	DAN 106	GD 106	EB 6.1	AD65	F05 / F07
			DAN 120	GD 120
HPAC080DA	258 Nm	–	DAN 180	GD 180	EB 8.1	AD80	F05 / F07
			DAN 240	GD 240
HPAC090DA	384 Nm	RC240	DAN 360	GD 360	EB 9.1	–	F07 / F10
HPAC100DA	565 Nm	RC250	DAN 480	GD 480	EB 10.1	AD100	F07 / F10
HPAC125DA	922 Nm	RC260	DAN 720	GD 720	EB 12.1	AD125	F10 / F12
HPAC140DA	1288 Nm	RC265	DAN 960	GD 960	EB 14.1	–	F12/F16 or F14
HPAC160DA	1948 Nm	RC270	DAN 1440	GD 1440	EB 16.1	AD140	F12/F16 or F14
			DAN 1920	GD 1920
HPAC180DA	2718 Nm	–	–	–	EB 18.1	AD160	F12/F16 or F14
						AD185
HPAC220DA	4639 Nm	RC280	DAN 2880	GD 2880	EB 20.1	AD210	F16
			DAN 3840	GD 3840
HPAC260DA	9534 Nm		DAN 5760	GD 5760	EB 22.1	AD260	F25
			DAN 8000	GD 8000	EB 26.1

Looking to Transition Your Valve Assemblies to Cost-Effective HPAC Series Actuators?

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✓ Consistent batch quality with full inspection reports

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HPAC Series Scotch Yoke Pneumatic Actuator FAQs

Q: How does the service life of an HPAC scotch yoke actuator compare to a rack and pinion actuator?

HPAC actuators last much longer under heavy use because they use better wear-resistant parts. Standard rack-and-pinion actuators use aluminum or steel gear teeth that rub together, which wear down and become loose over time. In contrast, the HPAC uses a hardened alloy steel scotch yoke and piston pin, supported by smooth polymer guide rings and heavy-duty copper alloy bushings. This setup stops metal-to-metal rubbing, cuts friction, and keeps the actuator running smoothly without jamming or breaking down.

Q: How do operating speeds of HPAC actuators compare to rack and pinion models of equivalent torque?
HPAC actuators cycle faster than rack-and-pinion models with the same torque rating. Because the scotch yoke design generates higher force from a smaller cylinder, it requires up to 30% less air volume to fill and exhaust. This smaller air chamber delivers quicker response times during routine daily cycling.

Q: How does the external body profile differ between double-acting and spring-return HPAC actuators?
Double-acting models use compact, flush end caps on both sides. Spring-return (single-acting) models incorporate extended barrel end covers on both ends to house the pre-compressed safety spring cartridges, resulting in a wider overall length while maintaining a symmetrical design.

Q: How are internal springs configured in HPAC single-acting actuators, and can they be changed for different air pressures?
HPAC single-acting scotch yoke actuators use a nested spring design inside the end caps, available in K11 through K33 combinations to match your plant air supply (2.5 to 8.0 bar) and required valve torque. Loose springs cannot be serviced or swapped by hand due to heavy internal pre-load tension. To adapt an actuator to a different air pressure or carry out routine maintenance, simply replace the complete end cap and spring pack together as a factory pre-compressed set. These replacement spring packs can be ordered separately as optional add-on spares.

Q: Can I convert an HPAC single-acting actuator from Fail-Close (FC) to Fail-Open (FO)?

No, field conversion is not recommended. HPAC single-acting models use heavy factory pre-compressed springs. Opening the spring modules on-site is dangerous, and turning the actuator upside down changes the torque output curve, which can cause valve leakage. Please specify Fail-Close (FC) or Fail-Open (FO) when ordering so we can set and test it properly at the factory before shipping.

Q: Can the HPAC female output drive be adapted to match smaller valve stems?
Yes. Standard double-square output sockets can be stepped down using square reduction sleeves (drive inserts), allowing direct mounting onto smaller valve shafts without custom machining or elevated brackets. For example, an HPAC220DA model with a standard 55 x 55 mm drive socket can directly fit a 46 x 46 mm valve stem using a 55-to-46 mm reduction sleeve.

Q: Can the rotation angle of HPAC actuators be adjusted after installation?

Yes. Both double-acting and spring-return (single-acting) models have independent adjustment screws on both end caps. These screws provide ±3° adjustment at both the 0° (fully closed) and 90° (fully open) positions. You can easily fine-tune tight shutoff and align external indicators without removing the actuator from the valve.

Q: Can HPAC actuators be mounted sideways on horizontal valve stems?
Yes. Internal guide rings support the piston and yoke mechanism equally in any position, preventing side load, jamming, or uneven seal wear. They fit directly onto horizontal butterfly or ball valves in compact spaces. For outdoor installations, just ensure the air ports or exhaust silencers point downward to prevent water buildup.

Q: Are replacement seal kits interchangeable between single-acting and double-acting compact scotch yoke actuators of the same model size?
Yes. Soft seal kits (including NBR dynamic piston seals, guide ring wear bands, and center body O-rings) are standardized by cylinder bore size. You do not need to stock separate seal sets for single-acting versus double-acting scotch yoke actuators of the same model size, simplifying spare parts inventory and reducing SKU overhead.

Q: Can HPAC actuators be stored in warehouse stock for extended periods before being assembled onto valves?
Yes. HPAC actuators feature durable NBR O-rings and synthetic grease, allowing long-term indoor storage without issue. For extended storage, cycle the actuator periodically without load to keep the seals flexible and the grease evenly distributed.

HPAC Series Scotch Yoke Pneumatic Actuator Troubleshooting & Maintenance

Fault Symptom	Possible Cause	Corrective Action
No opening or closing action	Air supply interrupted; air supply pressure too low; pneumatic circuit blocked; solenoid valve or control signal failure; excessive load	Restore and check the air supply; adjust air supply to the specified range; clean the piping; check the solenoid valve, power supply, and control signal; recheck actuator selection and valve torque
Fails to reach full open or full closed position	Incorrect end-position adjustment direction; incorrect mounting orientation; valve sticking; insufficient air supply	Readjust in the correct direction; verify valve position, shaft orientation, and fail-position requirements; inspect the valve; check air supply pressure and flow
Abnormal operating speed	Insufficient flow; tubing too small or blocked; silencer blocked; change in valve load	Check the air preparation unit, tubing size, control valve, and silencer; check valve operating condition
Air leakage	Sealing nut not tightened; fitting loose; output shaft seal, end cap seal, or piston seal damaged	Tighten connections and sealing nuts; perform leak testing; have the corresponding seals replaced by qualified personnel
Abnormal position feedback	Indicator direction incorrect; accessories loose; sensor position incorrect; wiring or control signal abnormal	Recalibrate the indicator and accessories; tighten connections; check sensor position, wiring, and control system
Abnormal impact or noise during operation	Air supply pressure too high; flow too large; improper end-position setting; mechanical interference	Reduce and stabilize the air supply pressure; adjust flow; reset end positions; check mounting concentricity and interference

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