Pilot Operated Safety Relief Valve – Types, Specs & Dealer Price India
Pilot Operated Safety Relief Valve – Types, Specs & Dealer Price India
Pilot Operated Safety Relief Valves (POSRVs) are advanced pressure control devices designed to provide overpressure protection in high-pressure and critical service applications. They offer superior performance, minimal leakage, and are used in refineries, steam systems, chemical plants, and power boilers.
What is a Pilot Operated Safety Relief Valve?
A POSRV uses a smaller pilot valve to control the main valve. When the system pressure reaches the set limit, the pilot opens, allowing the main valve to relieve pressure. This design ensures tighter sealing and allows for higher capacity and lower blowdown compared to conventional spring-loaded valves.
Key Features
- Accurate pressure control with narrow blowdown
- Compact and lightweight body
- Full lift or modulating action options
- Metal-to-metal or soft seat sealing
- Suitable for gases, vapors, and steam
Available Types
- Modulating Type POSRV – Gradual opening based on pressure rise
- Pop Type POSRV – Full lift at set pressure
- Balanced Bellows POSRV – For backpressure compensation
- Soft Seat POSRV – Bubble-tight shutoff in clean service
- Steam Certified POSRV – With IBR and ASME Section I/III
Applications
| Industry | Typical Use |
|---|---|
| Steam Boilers | Primary pressure protection with tight sealing |
| Petrochemical Plants | Gas overpressure and critical line relief |
| Power Generation | High-pressure turbine lines and steam drums |
| Chemical & Pharma | Corrosive and volatile substance venting |
| Oil & Gas | Flare systems and process separators |
Top Pilot Operated Safety Relief Valve Manufacturers in India
- Udhhyog – Certified POSRVs in SS, CS, and alloy steel. Get Pricing
- Fisher (Emerson) – Global standard in modulating POSRV design
- Hyper Valves – Indian manufactured safety valves with MTCs
- Leser India – German design valves with ASME/API certification
- Kirloskar Valves – Trusted in power plants and boiler systems
POSRV Price List – Dealer Rates India (2025)
| Size (NB) | Material | Pressure Rating | Price Range (INR) |
|---|---|---|---|
| 25 NB | SS 304 | Class 150 | ₹8,000 – ₹12,000 |
| 50 NB | Carbon Steel | Class 300 | ₹15,000 – ₹22,000 |
| 80 NB | SS 316L | PN40 | ₹22,000 – ₹30,000 |
| 100 NB | Alloy Steel | Class 600 | ₹35,000 – ₹55,000 |
Certifications to Look For
- ASME Section I / VIII (U Stamp)
- IBR Approved for Indian boiler applications
- API 526, 527 for performance and leak test
- ISO 4126 compliance
- MTC, Hydrotest and Radiography reports
Checklist Before You Buy
- Confirm media type: gas, steam, liquid
- Select pressure rating and set point
- Verify soft or metal seat requirement
- Ensure pilot valve spec matches system fluid
- Request drawings, test reports and certification
Why Choose Udhhyog?
Udhhyog supplies pilot operated safety relief valves tested and certified for industrial use. Quick lead times, custom trim materials, and MOC flexibility make us a trusted POSRV supplier across India.
Visit: https://udhhyog.com | ? 9311120784
FAQs – Pilot Operated Safety Relief Valves
Q1. What is the difference between spring loaded and pilot operated safety valves?
Pilot operated valves offer tighter shut-off, lower blowdown, and better stability in high-pressure systems.
Q2. Can POSRV be used for steam applications?
Yes, with appropriate IBR and ASME certification and a steam-rated pilot valve.
Q3. What is the blowdown percentage in POSRV?
Typically 3% to 5%, much lower than spring-loaded designs.
Q4. Do POSRVs require frequent maintenance?
Less frequent than spring valves, but pilot filters and control lines must be checked regularly.
Q5. Are POSRVs suitable for fluctuating backpressure systems?
Yes, especially balanced bellows designs help maintain accuracy under varying backpressure.
Next Article: Swing Check Non Return Valve Manufacturer →
Comments : 0