Racer Valves Private Limited
Ahmedabad, Gujarat
GST No. 24AABCR6192G1ZD
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Call 08046048009 81% Response Rate
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A Pressure Safety Valve (PSV), also called a safety relief valve, is a protective device installed on pressurized systems (vessels, pipelines, boilers, etc.) to prevent the pressure from exceeding a safe limit. If pressure rises above a predetermined set point, the valve opens to let out fluid (liquid, gas, vapor), reducing the pressure. After the transient is over and pressure falls below a threshold (reseating pressure), the valve closes again.
In normal operation, the spring force keeps the disc pressed against the seat, blocking flow. Once inlet pressure exceeds the set pressure, the resultant force lifts the disc. The fluid is discharged until pressure drops; then the disc reseats.
Variants include spring-loaded (direct-acting), pilot-operated, balanced bellows, etc.
Key SpecificationsWhen specifying or evaluating a PSV, the following characteristics are typically required:
| Parameter | What It Means / How It’s Used |
|---|---|
| Set Pressure (or Cracking Pressure) | The pressure at which the valve begins to open. |
| Overpressure / Allowable Overpressure | How much pressure above the set point the valve must handle before opening fully. |
| Blowdown / Reseat Pressure | The pressure at which the valve closes again (often expressed as a percentage below set pressure). |
| Capacity / Discharge Rate | The maximum flow (mass or volume) the valve can safely vent at a given overpressure. |
| Operating / Maximum Temperature | The temperature range for the valve and trims. |
| Materials of Construction | Body, trim, seals, springs, etc. — must be compatible with fluid (corrosive, high temp, etc.). |
| Connection Type & Size | Flanged, threaded, welded, nozzle size, flange rating, etc. |
| Backpressure Tolerance | Maximum downstream pressure the valve can sustain without affecting its functioning (opening / closing). |
| Leakage Class / Tightness | Acceptable leakage rate when valve is closed. |
| Standards & Certifications | Compliance to codes like ASME, API, ISO, etc. |
| Cyclic Life | How many open/close cycles it can reliably perform. |
| Seat Design, Trim Type, Finish | Internal geometry, seating surface finish, hard facing, etc. |
| Accessories / Options | Locking devices, testing lever, blow-off ring, piping attachments, etc. |
| Safety Margins & Design Margin | Margin between design operating pressure and set pressure. |
Automatic protection against overpressure without human intervention
Reclosing capability (once pressure normalizes)
Reliable and fast response
Helps protect equipment, piping, and personnel
Minimizes damage and downtime
Ensures compliance with safety and regulatory standards
Adjustable set pressure (within design limits)
Can be maintained, tested, calibrated
PSVs are used in nearly every industry where fluids or gases are under pressure. Some typical applications:
Boilers, steam systems, pressure vessels
Petrochemical / chemical processing plants
Oil & gas upstream, midstream, downstream
Compressors, pumps, pipelines
Storage tanks, vessels, reactors
Cryogenic systems,LNG,refrigeration
Pharmaceutical, food & beverage
Water treatment, desalination plants