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Technical Datasheet -- Spring-Loaded Direct-Acting Pressure Reducing Valves
Direct-acting spring-loaded pressure reducing valves for water, steam, and compressed air service. Maintains constant downstream pressure regardless of upstream pressure and flow variations -- no external power, instruments, or control system required. Compact design with fast response. Diaphragm (EPDM/NBR for water) or piston (SS316 for steam) actuation. Factory-set and sealed to purchaser's exact downstream pressure. EN 1567 / ASME B16.34 compliant.
| Parameter | Specification |
|---|---|
| Product Type | Pressure Reducing Valves |
| Category | Control Valves |
| Size Range | 1/2" to 12" (DN15 to DN300) |
| Pressure Rating | PN16 / PN25 / PN40 / Class 150 / Class 300 |
| End Connections | Threaded NPT / BSP (1/2" to 2"), Flanged RF per EN 1092-1 / ASME B16.5 (1" to 12") |
| Body Material | ASTM A216 WCB / Ductile Iron EN-GJS-500-7 (GGG50) / ASTM A351 CF8M (SS316) / Gunmetal / Bronze (small sizes) |
| Trim Material | SS316 / Gunmetal / Bronze (standard); SS316 with Stellite 6 overlay (steam / high velocity) |
| Seat Material | SS316 with Stellite 6 overlay / EPDM insert (water, low pressure) / PTFE insert (water, chemical) |
| Diaphragm / Piston Material | EPDM / NBR / Viton FPM / PTFE / SS316 (piston type) |
| Spring Material | Carbon steel (standard) / SS316 (corrosive) / Inconel X-750 (high temp > 400 deg C) |
| Control Type | Direct-acting spring-loaded diaphragm or piston -- no external power, instruments, or pilot required |
| Set Pressure Range | 0.5 to 25 bar (7 to 365 psi) downstream -- factory-set and sealed per purchaser specification |
| Accuracy | +/- 5% to +/- 10% of set pressure (dependent on size, spring rate, and flow variation) |
| Temperature Range | -10 deg C to +80 deg C (water, EPDM diaphragm) -- up to +200 deg C (water/steam, NBR/Viton) -- up to +425 deg C (steam, SS316 piston with Inconel spring) |
| Component | Material |
|---|---|
| Carbon Steel | ASTM A216 WCB body (standard industrial water / steam) |
| Ductile Iron | EN-GJS-500-7 (GGG50) body (water distribution, economical) |
| Stainless Steel | ASTM A351 CF8M (SS316) body and trim (corrosive / chemical / food-grade service) |
| Gunmetal / Bronze | Gunmetal (LG2) or bronze body and trim (small sizes, water / marine / traditional applications) |
| Test | Requirement |
|---|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
| Standard | Description |
|---|---|
| Design Standard | EN 1567 Safety Devices for Protection Against Excessive Pressure -- Safety Valves (reference), ASME B16.34, manufacturer's standard |