SPIRAX SARCO · CONTROL VALVES
Spirax Sarco DP27S & DP27SY Pilot Operated Pressure Reducing Valves – IBR Approved
Spirax Sarco DP27S/DP27SY pilot operated PRV for steam & air. IBR compliant, DN15-DN50, up to 17 bar g. Contact PC Engineering for quotes.
Overview
The Spirax Sarco DP27S and DP27SY are pilot operated pressure reducing valves (PRVs) designed for accurate downstream pressure control in steam and compressed air systems. These valves comply with Indian Boiler Regulations (IBR), 1950, making them suitable for use in regulated industrial boiler and steam applications across India.
The DP27S features a variable rate conical pressure adjustment spring, enabling downstream pressure regulation across a wide range of 0.2 to 17 bar g. The DP27SY variant is optimized for low-pressure applications with a narrower range of 0.2 to 3 bar g. Both models incorporate an internal pressure balance pipe for stable operation and are designed for horizontal pipeline installation with the diaphragm chamber positioned below the line.
These valves are well-suited for applications requiring precise pressure reduction, high turndown ratios, or parallel/series configurations for varying load conditions and standby redundancy.
Key Features
- Pilot operated design for accurate and stable downstream pressure control
- IBR compliant – approved for use on steam systems under Indian Boiler Regulations
- Wide downstream pressure range: 0.2 – 17 bar g (DP27S) or 0.2 – 3 bar g (DP27SY)
- Available in screwed (BSP/NPT) and flanged connections (ASME 150 & 300)
- Suitable for steam and compressed air service
- Horizontal installation with diaphragm chamber below pipeline
- Can be installed in parallel or series for high capacity or high turndown applications
- Maximum operating temperature: 232°C
Specifications
| Parameter | Value |
|---|---|
| Sizes | DN15, DN20, DN25, DN32, DN40, DN50 |
| Connections | Screwed BSP/NPT (DN15–DN25), Flanged (DN15–DN50) |
| Flange Ratings | ASME 150 (DN15–DN50), ASME 300 (DN15, DN25–DN50) |
| Body Design Conditions | PN25 |
| Max Design Pressure | 17.2 bar g @ 232°C |
| Max Design Temperature | 232°C @ 17.2 bar g |
| Min Design Temperature | -10°C |
| Max Upstream Pressure (Saturated Steam) | 17 bar g |
| Max Operating Temperature | 232°C |
| Min Operating Temperature | 0°C |
| Max Differential Pressure | 17 bar |
| Cold Hydraulic Test Pressure | 25.8 bar g |
| Downstream Pressure Range (DP27S) | 0.2 – 17 bar g |
| Downstream Pressure Range (DP27SY) | 0.2 – 3 bar g |
| Compliance | Indian Boiler Regulations, 1950 (IBR) |
Applications
- Steam distribution systems in power plants, refineries, and chemical plants - Process steam pressure reduction in pharmaceutical and food processing industries - Compressed air systems requiring stable downstream pressure - Boiler houses and steam headers - Textile, paper, and sugar manufacturing facilities - Any IBR-regulated steam application requiring precise pressure control
Frequently Asked Questions
Get a Quote
Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco DP27S and 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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