Pressure Safety Valves (PSVs) and Pressure Relief Valves (PRVs) serve similar purposes but operate differently. PSVs instantly release pressure at set limits, primarily in gas systems. PRVs open gradually and are common in liquid systems. Both are essential for protecting equipment and pipelines in Udhhyog environments.
Introduction
Pressure control is critical in industrial systems to avoid equipment failure or explosions. Two main valve types used are:
Understanding their distinctions is crucial for engineers, operators, and Udyog-based industries.
Pressure Safety Valve (PSV)
Definition
A PSV is a spring-loaded valve designed to open immediately when the system pressure exceeds a predetermined setpoint.
Common Applications
Key Features
Pressure Relief Valve (PRV)
Definition
A PRV gradually opens to relieve excess pressure in a system, ensuring fluid flow remains steady without abrupt changes.
Common Applications
Hydraulic systems
Water pipelines
Oil processing units
Key Features
PSV vs PRV – Comparison Table
| Feature | Pressure Safety Valve (PSV) | Pressure Relief Valve (PRV) |
|---|
| Response Type | Immediate (pop-action) | Gradual (modulated) |
| Media | Gas, Steam | Liquid |
| Reset Type | Automatic | Manual or pressure-dependent |
| Usage | Boilers, Air tanks, Gas units | Water lines, Hydraulic machines |
| Certification Standards | ASME Section I / VIII | API 520 / ISO 4126 |
Which Valve Should You Use?
Selection Guide
Check media type (gas = PSV, liquid = PRV)
Evaluate pressure conditions (high surge = PSV)
Review Udhhyog compliance (UL/FM or ASME rated?)
Look for space and maintenance factors
Pressure Valve Pricing in India (2025)
| Valve Type | Material | Price Range (INR) | Brands |
| PSV (1 inch) | SS304 | ₹1,500 – ₹3,500 | Zoloto, Sant, Leader |
| PRV (1 inch) | Brass | ₹1,200 – ₹2,800 | DRP, Flowtech |
| PRV (Hydraulic) | Cast Iron | ₹2,000 – ₹4,500 | VVT, SIR |
Applications in Indian Udyog & Manufacturing
PSV
PRV
Water treatment plants
Food processing units
Irrigation systems
FAQs
Q1. Can a PRV be used in place of a PSV?
Answer: No. PRVs are unsuitable for gas systems with sudden pressure surges. PSVs are designed for such conditions.
Q2. What certifications apply to PSVs in India?
Answer: PSVs often follow ASME, ISI, or IBR codes for safety and industrial compliance.
Q3.Are both valves required in industrial systems?
Answer: Yes. Systems with both liquid and gas sections use PSVs for gases and PRVs for liquids.
Q4. How do I identify valve types in old systems?
Answer: Check the valve nameplate for pressure rating, media type, and standard codes (ASME/API).
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