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Pneumatic UPVC Double Union Diaphragm Valve
Pneumatic UPVC Double Union Diaphragm Valve
Hearken Pneumatic UPVC Diaphragm Valve offers an optimal combination of corrosion resistance and serviceability. The valve’s body, constructed from durable UPVC , provides broad chemical compatibility, while its innovative double union design allows the main valve body to be removed from the pipeline for maintenance without disturbing the pipe connections. At its core, a flexible diaphragm isolates the process fluid from all mechanical parts, ensuring zero external leakage and protecting the actuator from corrosive media.
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Features & Benefits
- Simplified In-Line Maintenance: The double union (true union) connections are the standout feature. Technicians can simply unscrew the two union nuts and lift the entire valve body out for inspection, diaphragm replacement, or cleaning. This eliminates the need to cut pipe, drastically reducing system downtime and labor costs.
- Absolute Media Isolation and Safety: By design, the valve is glandless (it has no packing seals). The diaphragm forms a complete, leak-proof barrier between the fluid path and the operating components. This eradicates the risk of external leaks common with packed valves, making it exceptionally safe for handling hazardous or corrosive chemicals.
- Superior Chemical Resistance: The UPVC body is inherently immune to a wide spectrum of acids, alkalis, salts, and other corrosive chemicals that would quickly degrade metal valves. This makes it a cost-effective and long-lasting solution for demanding chemical processing lines.
- Unobstructed Flow Path: Like all diaphragm valves, it provides a smooth, open flow path when actuated, minimizing pressure drop and preventing the buildup of solids or slurries, ensuring efficient system performance.
Main Materials
| No. | Part Name | Material |
|---|---|---|
| 1 | Body | UPVC |
| 2 | Diaphragm | EPDM |
| 2a | Cushion | EPDM |
| 3 | Disc | NILO |
| 4 | Bonnet | UPVC |
| 5 | Stem | 2Cr13 |
| 6 | Stem Nut | HPb59-1 (Leaded Brass) |
| 7 | Cylinder | Aluminum Alloy |
| 8 | Cap | Plastic |
Dimensional Table

| NPS (in) | DN (mm) | PN (MPa) | L | D1 | A | H1 | W (kg) | D | B |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 15 | 0.6 | 145 | 20 | 110 | 195 | 2 | 8 | 25 |
| 3/4 | 20 | 0.6 | 160 | 25 | 110 | 200 | 2.3 | 8 | 25 |
| 1 | 25 | 0.6 | 175 | 32 | 110 | 210 | 2.5 | 8 | 25 |
| 1 1/4 | 32 | 0.6 | 200 | 40 | 110 | 228 | 3 | 8 | 36 |
| 1 1/2 | 40 | 0.6 | 225 | 50 | 140 | 240 | 5 | 10 | 36 |
| 2 | 50 | 0.6 | 272 | 63 | 170 | 290 | 8 | 10 | 45 |
Applications
This valve is the preferred choice for systems where corrosion is a primary concern and ease of maintenance is valued:
- Water & Wastewater Treatment: Perfect for chemical dosing lines, including sodium hypochlorite, ferric chloride, and acids/bases for pH control.
- Chemical Processing & Transfer: Reliably handles the transfer and regulation of a wide variety of industrial chemicals.
- Aquaculture & Life Support Systems: Its inert material construction ensures that no harmful substances leach into sensitive aquatic environments.
- Plating and Metal Finishing: Withstands the extremely corrosive environments found in electroplating and surface finishing facilities.






















