SPIRAX SARCO · PRESSURE REDUCING VALVES
Spirax Sarco DP27S / DP27SY Pilot Operated Pressure Reducing Valve – SG Iron Body, IBR Certified
Spirax Sarco DP27S/DP27SY pilot operated PRV with SG iron body for steam & air. IBR certified. DN15-DN50. Contact PC Engineering for quote.
Overview
The Spirax Sarco DP27S and DP27SY are pilot operated pressure reducing valves designed for precise downstream pressure control in steam and compressed air systems. These valves feature robust SG iron (spheroidal graphite iron) bodies conforming to DIN 1693 GGG 40.3, providing excellent mechanical strength and durability in demanding industrial environments.
The pilot operated design ensures accurate and stable pressure regulation across a wide operating range. The DP27S model covers a downstream pressure range of 0.2 to 17 bar g, suitable for general steam and compressed air applications. The DP27SY variant is optimized for sterilizer and critical low-pressure control applications, with a narrower downstream pressure range of 0.2 to 3.0 bar g using a lower rate control spring.
Both models fully comply with Indian Boiler Regulations (IBR) 1950 and are available with IBR certification and manufacturer's Typical Test Report—essential documentation for boiler house installations across India.
Key Features
- Pilot operated design for accurate, stable downstream pressure control
- SG iron body (EN-GJS-400-18-LT) for high mechanical strength and longevity
- Stainless steel internals (AISI 316, 321, 431, 304) for corrosion resistance
- IBR certified – complies with Indian Boiler Regulations, 1950
- Wide downstream pressure range: 0.2–17 bar g (DP27S) or 0.2–3 bar g (DP27SY)
- Available in DN15LC to DN50 sizes with screwed (BSP/NPT) or flanged (ASME 150/300) connections
- Internal strainer and pilot filter for reliable operation
- Suitable for saturated steam, superheated steam, and compressed air (not for oxygen service)
Specifications
| Parameter | Value |
|---|---|
| Body Material | SG Iron DIN 1693 GGG 40.3 / EN-GJS-400-18-LT |
| Internals | Stainless Steel (AISI 304, 316, 321, 431) |
| Sizes Available | DN15LC, DN15, DN20, DN25, DN32, DN40, DN50 |
| Connection Types | Screwed BSP/NPT (DN15–DN25), Flanged ASME 150/300 |
| Body Design Pressure | PN25 |
| Max. Design Pressure | 17.2 bar g @ 232°C (ASME 300), 17.2 bar g @ 40°C (ASME 150) |
| Max. Operating Temperature | 232°C @ 17.2 bar g |
| Min. Operating Temperature | 0°C (consult Spirax Sarco for lower) |
| Max. Upstream Pressure (Steam) | 17 bar g |
| Max. Differential Pressure | 17 bar |
| Downstream Pressure Range | 0.2–17 bar g (DP27S), 0.2–3 bar g (DP27SY) |
| Cold Hydraulic Test Pressure | 25.8 bar g |
| Kv Values (Max.) | DN15LC: 1.0 / DN15: 2.8 / DN20: 5.5 / DN25: 8.1 / DN32: 12.0 / DN40: 17.0 / DN50: 28.0 |
| Compliance | Indian Boiler Regulations, 1950 (IBR) |
Applications
- Steam distribution and pressure control in boiler houses - Sterilizers and autoclaves (DP27SY recommended for low-pressure critical control) - Compressed air systems in manufacturing plants - Process heating systems in textile, pharmaceutical, food & beverage, and chemical industries - Laundry and hospital steam systems - Any IBR-regulated steam installation requiring certified pressure reducing valves
Frequently Asked Questions
Get a Quote
Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco DP27S / DP27SY Pilot Operated Pressure Reducing Valves. Call us or fill in our inquiry form — our engineers will respond within 24 hours.
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