A Pressure Safety Valve is the "last line of defense" that keeps your machines from exploding when pressure gets too high.
Aura Safety supplies ASME-certified Pressure Safety Valves (PSV) and Pressure Relief Valves (PRV) engineered for the most demanding industrial environments—oil & gas, petrochemicals, power generation, and process industries. Whether you require a standard spring-loaded safety valve or a custom pilot-operated solution, our team delivers the right valve, certified to spec, on time.
Every PSV we supply is backed by full documentation: ASME Section VIII, API 526, Mill Test Certificates (MTC), and third-party inspection reports from BV, TUV, or SGS on request. We help plant engineers, procurement managers, and EPC contractors source, inspect, and certify pressure safety valves with zero compliance risk.
Ready to specify a PSV for your plant? Our engineers respond within 24 hours.
Sourcing a pressure safety valve is a compliance decision, not just a purchase. A substandard or incorrectly sized PSV can lead to catastrophic equipment failure, regulatory fines, or plant shutdowns. Here is why engineers and procurement managers across the industry trust Aura Safety:
Compliance Guarantee: Every pressure safety valve supplied by Aura Safety meets the applicable ASME BPVC, API 526, and ISO 4126 standards. We provide the documentation your safety auditor needs — first time, every time.
We supply all major PSV configurations to match your process fluid, operating pressure, and backpressure conditions. Use the table below to identify the right valve type, then contact our team for sizing and lead time.
| Valve Type | Best For | Standard | Available Sizes |
| Spring-Loaded Safety Valve | Gas, steam, air; standard process service | ASME VIII / API 526 | 15mm – 300mm NB |
| Pilot-Operated Safety Valve (POSV) | High-pressure gas; tight shutoff below set pressure required | API 526 / API 520 | 25mm – 200mm NB |
| Balanced Bellows Valve | Service with significant built-up or superimposed backpressure | ASME VIII | 15mm – 150mm NB |
| Pressure Relief Valve (PRV) | Liquid service (water, oil, hydraulic fluid); modulating relief | ASME VIII / API 526 | 15mm – 200mm NB |
| Safety Relief Valve (SRV) | Mixed-phase or two-phase service; dual duty applications | ASME VIII | 25mm – 150mm NB |
We stock and source PSVs in carbon steel (WCB), stainless steel (CF8, CF8M / SS316), alloy steel, Inconel, and PTFE-lined bodies — suitable for corrosive, cryogenic, high-temperature, and sour gas service. Specify your MOC when requesting a quote.
Overpressure protection is mandatory across virtually every process industry. Aura Safety has supplied PSVs and PRVs into the following sectors, with full compliance documentation for each:
Wellheads, separators, storage tanks, compressor stations, and refinery processing units all require certified PSVs for ASME or API compliance. We supply valves rated for sour gas (H2S) service, NACE MR0175-compliant materials, and offshore-rated trim on request.
Reactors, distillation columns, heat exchangers, and storage vessels handling corrosive or toxic fluids demand PSVs with the correct body material and seat compatibility. We supply PTFE-lined and Hastelloy-trim options for aggressive chemical service.
Boiler drum safety valves, steam turbine bypass valves, and heat recovery steam generators (HRSG) require ASME Section I and Section VIII certified valves. IBR (Indian Boiler Regulations) approved valves are available for boiler applications in India.
Sanitary-grade PSVs in SS316L with polished internals are available for clean-service applications requiring FDA or GMP compliance documentation.
Low-temperature service PSVs rated to -196 degrees C for LNG tanks, cryogenic vessels, and gas storage spheres — supplied with full impact test documentation for sub-zero service.
Use this reference table when preparing a purchase requisition or comparing PSV specifications. For custom requirements outside these ranges, contact our engineering team.
Parameter | Standard Range | Notes |
Size Range | 15mm – 300mm NB (1/2″ – 12″) | Flanged and screwed end connections available |
Set Pressure Range | 0.5 bar – 500 bar | Factory-set and tested before dispatch |
Temperature Range | -196°C to +540°C | Material-dependent; specify service temperature |
Body Materials | WCB, CF8, CF8M (SS316), LCC, Inconel, Hastelloy | NACE / sour service options available |
Seat / Disc Material | SS316, Stellite, PTFE, Monel | Lapped finish for positive shutoff |
Connection Type | Flanged (ASME 150# – 2500#), Screwed (NPT/BSP) | RTJ, RF, FF flange faces available |
Overpressure Allowance | 10% above set pressure (ASME VIII) | 21% for single PRV protecting a fire case |
Blowdown | 5–10% of set pressure (adjustable) | Prevents rapid cycling / chattering |
Applicable Codes | ASME Section I & VIII, API 526, ISO 4126, IBR, PED | CE marking available for European projects |
Testing Standard | ASME BPVC, API 527 (seat leakage) | Test bench reports provided with every valve |
This is one of the most common questions we receive from plant engineers and procurement teams. Both valves protect pressure equipment from overpressure—but they work differently, and selecting the wrong type for your service creates a compliance risk.
Feature | PSV — Pressure Safety Valve | PRV — Pressure Relief Valve |
Opening Action | Pop (full-open instantly at set pressure) | Modulating (opens gradually as pressure rises) |
Primary Service Fluid | Gas, steam, vapor | Liquid (water, oil, hydraulic fluid) |
Applicable Standard | ASME Section VIII, API 526 | ASME Section VIII, API 526 |
Typical Applications | Boilers, compressors, gas pipelines, pressure vessels | Pump discharge, liquid-filled vessels, hydraulic systems |
Also Called | Safety valve, SV, pop-type valve | Relief valve, PRV, modulating relief valve |
Specification Warning: Installing a PRV (modulating) on a gas or steam system—or a PSV (pop-action) on a pure liquid system—can result in valve chattering, seat damage, or failure to relieve. Always specify the correct valve type. Our engineers will validate your selection before order confirmation.
When in doubt, share your process conditions — fluid phase, set pressure, operating pressure, and backpressure — and our team will recommend the correct valve category, orifice size, and body rating.
Check out the Aura Safety Services to know more what they are providing with expertise
To generate an accurate quote and ensure the valve you receive is correctly sized per API 520 Part I, our team requires the following process data from your datasheet or P&ID. Providing complete information upfront avoids back-and-forth and accelerates your delivery.
Read More about Process safety services
You can also send us your Relief Valve Data Sheet (RVDS) or a completed API 520 sizing worksheet—our engineers will verify the calculation and confirm the recommended orifice designation before we confirm the order.
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Identify, evaluate, and control process hazards with expert risk assessments, ensuring safe, reliable, and compliant industrial operations.
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No. PSVs should only be fixed by certified technicians. If you fix it wrong, it might not open during an emergency. Look for a shop with a "VR" (Valve Repair) stamp.
This is the pressure used to test a valve on a bench at room temperature. Because metal gets weaker when hot, the test pressure at the shop might be slightly different than the "set pressure" in a hot factory.
The lever is there so you can manually open the valve. This lets you check if the moving parts are stuck. It is usually used for steam or air valves.
With good care, a PSV can last 20 to 30 years. However, the soft parts (like seals) usually need to be replaced every few years.
Corrosion is the biggest enemy. If the chemicals in your pipes eat away at the metal or the spring, the valve will fail. Always choose the right material, like stainless steel, for harsh chemicals.
A Pressure Safety Valve (PSV) is a spring-loaded automatic valve installed on pressurized vessels, pipelines, or equipment to protect against overpressure. When process pressure reaches the valve's set pressure, the spring force is overcome and the valve disc lifts — releasing excess pressure to a safe location (flare, vent, or drain). Once pressure drops to the reseating pressure, the spring forces the disc closed automatically. No external power or manual intervention is required.
A PSV (Pressure Safety Valve) opens instantly with a pop action and is designed for gas, steam, and vapor service. A PRV (Pressure Relief Valve) opens gradually and modulates flow — it is designed for liquid service. The terms are sometimes used interchangeably, but specifying the wrong type for your service fluid can lead to chattering, seat damage, or inadequate relief. The combined term Safety Relief Valve (SRV) describes valves suitable for both gas and liquid service.
For most industrial applications in the US and internationally, PSVs should carry ASME Section VIII certification (indicated by the UV or UV1 stamp) and comply with API 526 design requirements. For boilers, ASME Section I (V stamp) is required. In India, IBR approval is mandatory for steam boilers. European projects require PED (Pressure Equipment Directive) compliance and CE marking. Always request the test certificate and certification documentation with your purchase order.
Most regulatory frameworks and industry best practices recommend testing PSVs every 12 to 24 months, depending on service severity and the fluid handled. Valves in corrosive or fouling service may require more frequent testing. Testing must be performed on a calibrated test bench, and results — including the set pressure, seat leakage (per API 527), and blowdown — must be documented and retained for regulatory audit. Aura Safety can assist in arranging third-party valve testing and recertification.
Simmering or weeping from a PSV is most often caused by fouling or grit on the seat/disc lapping surfaces, incorrect set pressure relative to operating pressure (the valve should be set at least 10% above normal operating pressure to prevent premature lift), or seat damage from previous chattering. Aura Safety recommends inspecting and re-lapping the seat if the valve has been in service more than two years, or replacing the internals if the seat damage is severe.
Chattering — rapid, repetitive opening and closing — typically occurs when the PSV is oversized for the relieving flow, when the inlet pressure drop to the valve exceeds 3% of set pressure, or when the valve's blowdown is set too tightly. Chattering causes rapid seat wear and valve failure. Proper sizing (per API 520) and correct inlet piping design (per API 520 Part II) prevent chattering. Contact our engineers if you are experiencing chattering on an installed valve.
For standard spring-loaded PSVs in common sizes (15mm–100mm) and standard materials (WCB, SS316), Aura Safety typically dispatches within 3–7 business days from order confirmation. Custom sizes, special materials (Inconel, Hastelloy, PTFE-lined), or valves requiring specific third-party certification may require 2–4 weeks. Contact us with your project timeline and we will confirm a committed delivery date.
