CPVC Pressure Relief Valve
A CPVC Pressure Relief Valve (PRV) is a safety valve made from Chlorinated Polyvinyl Chloride (CPVC) material, designed to automatically release excess pressure from a piping system or tank when the internal pressure exceeds a preset limit. It helps protect pipelines, fittings, pumps, and other equipment from damage caused by overpressure conditions. A CPVC Pressure Relief Valve is essential for maintaining system safety, preventing pipe bursts, leaks, and equipment damage in high-pressure CPVC piping systems.
The CPVC Pressure Relief Valve is a safety device engineered to automatically release excess pressure from piping systems to prevent equipment damage or failure. This CPVC Pressure Relief Valve is ideal for use in chemical processing, oil, gas treatment, and industrial applications involving corrosive fluids and elevated temperatures. The valve opens when system pressure exceeds a preset level and reseats once normal pressure is restored, ensuring continuous protection.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
CPVC Pressure Relief Valve Details
L: Overall Length (mm)
H: Overall Height (mm)
D: Body/Handwheel Diameter (mm)
d: Socket/Pipe Outer Diameter (mm)
z: Socket Depth (mm)
h: Internal Clearance/Component Height (mm)
| DN | L | H | D | d | z | h |
| 15 | 170 | 172 | 82 | 20 | 21 | 27 |
| 20 | 170 | 172 | 82 | 25 | 21 | 27 |
| 25 | 212 | 202 | 107 | 32 | 26 | 35 |
| 32 | 226 | 202 | 107 | 40 | 28.5 | 35 |
| 40 | 292 | 259 | 148 | 50 | 37 | 58 |
| 50 | 305 | 259 | 148 | 63 | 37 | 58 |
| Parameter | Specification |
| Valve Type | Spring-loaded / Diaphragm type Pressure Relief Valve |
| Function | Automatically releases excess pressure to protect piping systems |
| Body Material | CPVC (Chlorinated Polyvinyl Chloride) |
| Diaphragm / Internal Parts | PTFE / EPDM / FKM (Viton) / Stainless Steel |
| Size Range | ¼″ to 2″ (DN8–DN50) |
| End Connections | Threaded (BSP/NPT), Socket, Flanged, True Union |
| Set Pressure Range | 5–150 PSI (0.3–10 bar adjustable) |
| Factory Preset Pressure | Typically 50 PSI (adjustable) |
| Maximum Operating Pressure | Up to 150–250 PSI (depending on design & temperature) |
| Temperature Range | 0°C to 93°C (standard CPVC range) |
| Extended Temp Range | Up to ~120–150°C (with special diaphragm materials) |
| Operation Type | Automatic opening & reseating |
| Adjustment Mechanism | Spring-loaded screw (field adjustable) |
| Flow Design | 2-port / angle pattern (low pressure drop) |
| Standards | ASTM D1784, NSF/ANSI 61 |
| Leakage | Bubble-tight sealing (diaphragm design) |
| Density | 1.45 – 1.55 g/cm³ |
| Color | Grey / Off-white |
| Tensile Strength | 50 – 60 MPa |
| Flexural Strength | 80 – 95 MPa |
| Hardness | Rockwell R110 – R120 |
| Thermal Conductivity | ~0.14 W/m·K |
| Thermal Expansion | 6 – 7 × 10⁻⁵ /°C |
| Max Service Temperature | ~93°C (continuous use) |
| Water Absorption | < 0.4% |
| Electrical Property | Non-conductive |
| Corrosion Resistance | Excellent (acids, alkalis, salts) |
| Chemical Resistance | Suitable for aggressive chemicals |
| UV Resistance | Moderate (outdoor protection required) |
| Flammability | Self-extinguishing (UL94 V-0 typical) |
Automatic Overpressure Protection: Opens instantly when pressure exceeds the preset limit.
Chemical and Corrosion Resistance: CPVC construction ensures durability in aggressive chemical environments.
High Temperature Tolerance: Suitable for fluids up to 93°C (200°F).
Reliable Performance: Consistent operation with bubble-tight sealing.
Adjustable or Factory-Set Pressure Range: Offers flexibility for various applications.
Low Maintenance: Non-metallic components reduce rust and scale buildup.
Compact and Lightweight Design: Easy to install and integrate into new or existing systems.
Non-Conductive Material: Suitable for electrically sensitive applications.
| Valve Size (Inch) | Maximum Working Pressure at 23°C (73°F) | Maximum Working Pressure at 60°C (140°F) | Set Pressure Range |
| ½” | 150 PSI (10 bar) | 75 PSI (5 bar) | 15 – 150 PSI |
| ¾” | 150 PSI (10 bar) | 75 PSI (5 bar) | 15 – 150 PSI |
| 1″ | 150 PSI (10 bar) | 75 PSI (5 bar) | 15 – 150 PSI |
| 1½” | 150 PSI (10 bar) | 70 PSI (4.8 bar) | 15 – 150 PSI |
| 2″ | 150 PSI (10 bar) | 60 PSI (4 bar) | 15 – 150 PSI |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using CPVC Pressure Relief Valve
Corrosion Resistance
Made from CPVC (Chlorinated Polyvinyl Chloride), it offers excellent resistance to acids, alkalis, and corrosive chemicals, making it ideal for aggressive environments.
High Temperature Handling
Suitable for handling fluids at elevated temperatures (generally up to 90°C), making it more reliable than standard PVC valves.
Pressure Protection
Automatically opens when system pressure exceeds the preset limit, protecting pipes, pumps, and fittings from overpressure damage.
Lightweight & Easy Installation
CPVC construction makes the valve lightweight, reducing installation time and labor costs.
Low Maintenance
Non-metallic body prevents rust and scaling, minimizing maintenance requirements.
Chemical Compatibility
Compatible with a wide range of industrial chemicals, making it suitable for chemical processing plants.
Cost-Effective
Lower cost compared to metal pressure relief valves while providing reliable performance.
Leak-Proof Operation
Designed with precision sealing to ensure tight shut-off and prevent fluid loss.
Long Service Life
Resistant to UV exposure (with proper stabilization) and harsh environmental conditions, increasing durability.
Smooth Flow Characteristics
Internal design ensures efficient pressure release without significant system disturbance.
Types of CPVC Pressure Relief Valve
1. Direct-Acting (Spring-Loaded) CPVC Relief Valve
- Uses a spring mechanism to keep the valve closed until system pressure exceeds a preset limit.
- Simple, reliable design with fast response.
- Ideal for low to moderate pressure applications.
2. Pilot-Operated CPVC Relief Valve
- Uses a pilot control to sense system pressure and actuate the main relief valve.
- Offers more accurate pressure control and larger flow capacity.
- Suited for systems with fluctuating pressure or higher flow needs.
3. Adjustable Pressure Relief Valve
- Allows manual adjustment of the set pressure within a defined range.
- Flexible for tuning protection levels based on system requirements.
- Useful in systems where pressure conditions change over time.
4. Fixed Set Pressure Relief Valve
- Designed to open at a fixed, factory-set pressure.
- Simple and cost-effective where standard protection is sufficient.
- No need for field adjustments.
5. Compact/Low-Profile Relief Valve
- Smaller footprint for installations with space constraints.
- Often spring-loaded with preset or adjustable options.
- Suitable for light industrial CPVC systems.
6. Balanced Bellows Relief Valve (CPVC body with PTFE bellows)
- Incorporates bellows to balance the effects of backpressure.
- Provides stable operation in systems with variable backpressure.
- Commonly used where accurate relief action is critical.
7. Combination Relief and Backflow Preventer
- Integrates pressure relief and backflow prevention in one unit.
- Saves space and cost in complex piping networks.
- Useful in oil, gas treatment and industrial fluid systems.
8. Vacuum/Pressure Relief Valve
- Protects against both positive pressure and vacuum conditions.
- Opens to relieve excess pressure or admits air if vacuum develops.
- Ideal for closed tanks or systems subject to temperature-induced pressure swings.
Applications of CPVC Pressure Relief Valve
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
Petron Thermoplast specialises in manufacturing world-class chemical, sewerage & drainage piping systems for industrial and commercial applications, and CPVC Pressure Relief Valve for industrial applications, including infrastructure projects. As a leading CPVC products manufacturer and maker of CPVC in India, Petron Thermoplast products in the borewell and industrial categories. As we exclusively bring Petron Thermoplast CPVC chemical systems to the market, the first choice globally for potable chemical applications. Petron Thermoplast’s robust distribution network, combined with best-in-class technology, is set to create a strong & sustainable presence in the chemical Industry.
The core differences of CPVC Pressure Relief Valve lie in their connection method, applicable scenarios, and cost-effectiveness. The former is characterized by its lightweight and low cost, making it suitable for small pipelines and low-pressure conditions; the latter, with its high strength and ease of maintenance, dominates medium to large-scale industrial projects.
