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Self-Acting Downstream Pressure Reducing Valve for Water Distribution
This datasheet covers direct-acting diaphragm pressure reducing valves in ductile iron for maintaining constant downstream pressure in water distribution, building services, irrigation, and industrial feedwater systems.
| Parameter | Specification |
|---|---|
| Size Range | DN20 to DN300 (3/4" to 12") |
| Pressure Rating | PN10 / PN16 / Class 150 |
| Body Material | Ductile iron GGG50, epoxy coated inside and out |
| Trim Material | SS316 plug, seat, and stem |
| Diaphragm Material | Reinforced EPDM or NBR fabric-reinforced diaphragm |
| Set Pressure Range | 1 to 10 bar downstream (standard); higher on request |
| Temperature Range | 0°C to +80°C (EPDM) / +120°C (NBR) |
| End Connections | Screwed NPT/BSP (small sizes); flanged BS EN 1092-1 PN10/16 or ASME B16.5 Class 150 |
| Operation | Self-acting direct-acting diaphragm; no power or air required |
| Features | Downstream sensing, direct acting, EPDM diaphragm, SS316 trim, slow opening, anti-cavitation |
| Accuracy | ± 0.2 bar from set pressure across 10:1 flow turndown |
| Component | Material |
|---|---|
| Body | GGG50 ductile iron, sand cast, machined seat bore and diaphragm chamber, epoxy coated |
| Bonnet / Cover | GGG50 bolted cover with downstream pressure sensing port and spring chamber |
| Plug | SS316 streamlined plug with EPDM or NBR resilient seat insert for tight shutoff |
| Seat | SS316 replaceable seat ring, retained by snap ring |
| Stem | SS316 guided stem with upper and lower bearings |
| Diaphragm | EPDM or NBR fabric-reinforced rolling diaphragm, nylon fabric reinforced |
| Spring | Music wire compression spring, factory-set, field-adjustable within range |
| Gaskets | EPDM rubber gaskets for body/cover and diaphragm retention |
| Test | Requirement |
|---|---|
| Test Standard | Hydrostatic shell and seat test per BS EN 12266-1 |
| Certification | CE, ISO 9001, WRAS on request |
| Standard | Description |
|---|---|
| Design Standard | BS EN 1074-1 / AWWA C508 |
The Pressure Reducing Valve -- Direct Acting Diaphragm Ductile Iron is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.