CPVC Diaphragm Cock Valve
A CPVC Diaphragm Cock Valve is a type of industrial valve made from Chlorinated Polyvinyl Chloride (CPVC) that uses a flexible diaphragm and cock mechanism to control, regulate, or stop the flow of liquids in a piping system. The diaphragm presses against a valve seat to create a tight seal, ensuring leak-proof operation and preventing contamination of the fluid. This valve is widely used in chemical processing, water treatment, pharmaceutical, and corrosive fluid handling systems because CPVC offers excellent chemical resistance, high temperature tolerance, and long service life.
CPVC Diaphragm Cock Valve Supplier in India, as the name implies, plug valves have cylindrical or conical tapering “plugs” that can be moved inside the valve body to regulate flow. If the plug valve is open, fluid can flow through the plug. It is possible to control the flow of water through an external pipe using a CPVC diaphragm cock valve (also known as a plug valve, stopcock, and quarter-turn valve). Since ancient times, they have been used to control fluid flow, and they are one of the simplest methods available. The CPVC Diaphragm Cock Valve is usually operated manually with a handle, but it can also be operated remotely through other mechanisms. CPVC diaphragm cock valves can also be used for precise flow management to prevent fluid/pressure from passing beyond the cock valve, but these types of valves are less frequent.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
CPVC Diaphragm Cock Valve Details
*Technical Drawing
*Technical Measurement
| Parameter / Property | Details / Value |
| Valve Type | Diaphragm Cock Valve |
| Operation | Manual / Pneumatic / Electric (optional automation) |
| Body Material | CPVC (Chlorinated Polyvinyl Chloride) |
| Diaphragm Material | EPDM / PTFE / FKM (Viton) |
| Seat Type | Weir / Straight-through design |
| Size Range | ½” to 6” (DN15 to DN150) |
| Pressure Rating | PN6 / PN10 |
| Temperature Range | 0°C to 90°C |
| End Connection | Socket / Threaded / Flanged |
| Flow Control | Suitable for throttling and on/off service |
| Sealing | Leak-proof (bubble-tight) |
| Actuation Torque | Low (due to flexible diaphragm) |
| Bonnet / Stem Material | CPVC / PP / Stainless Steel (SS304/SS316) |
| Isolation | Media fully isolated from actuator components |
| Density | 1.45 – 1.58 g/cm³ |
| Tensile / Flexural Strength | 50 – 70 MPa / 80 – 100 MPa |
| Thermal Conductivity | ~0.14 W/m·K |
| Coeff. of Thermal Expansion | 6–7 × 10⁻⁵ /°C |
| Impact Strength | High |
- Corrosion-Resistant Material
Made from CPVC (Chlorinated Polyvinyl Chloride), which provides excellent resistance to acids, alkalis, and corrosive chemicals. - Flexible Diaphragm Sealing
The valve uses a flexible diaphragm that presses against the seat to provide tight and leak-proof sealing. - Smooth Flow Control
Allows effective on/off control and throttling of fluids with minimal flow resistance. - High Temperature Capability
Suitable for applications with temperatures up to 90–93°C, making it ideal for hot water and chemical systems. - Lightweight Construction
CPVC material makes the valve lighter than metal valves, allowing easy handling and installation. - Low Maintenance Design
Simple internal structure reduces wear and minimises maintenance requirements. - Excellent Chemical Compatibility
Can handle a wide range of chemicals, acids, salts, and industrial fluids without degradation. - Leak-Proof Operation
High-quality diaphragm and sealing components prevent leakage and ensure reliable performance. - Easy Installation
Available with socket, threaded, or flanged connections for convenient installation in different piping systems. - Long Service Life
Resistant to rust, scaling, and chemical damage, ensuring durability and long operational life in industrial applications.
| Valve Size (mm / Inch) | Pressure Rating (at 23°C) | Pressure Rating (at 60°C) | Pressure Rating (at 90°C) |
| 15 mm (1/2″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 20 mm (3/4″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 25 mm (1″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 32 mm (1 1/4″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 40 mm (1 1/2″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 50 mm (2″) | 10 kg/cm² | 7 kg/cm² | 4 kg/cm² |
| 65 mm (2 1/2″) | 8 kg/cm² | 6 kg/cm² | 3 kg/cm² |
| 80 mm (3″) | 8 kg/cm² | 6 kg/cm² | 3 kg/cm² |
| 100 mm (4″) | 8 kg/cm² | 6 kg/cm² | 3 kg/cm² |
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 Diaphragm Cock Valve
Excellent Corrosion Resistance
CPVC material provides strong resistance to acids, alkalis, and corrosive chemicals, making the valve suitable for chemical and industrial applications.
Leak-Proof Sealing
The flexible diaphragm design ensures tight sealing, preventing leakage and maintaining safe operation in fluid systems
High Temperature Resistance
CPVC valves can operate at temperatures up to 90–93°C, making them suitable for hot water and chemical processing systems.
Smooth Flow Control
The diaphragm mechanism allows precise control of fluid flow, making it suitable for both on/off and throttling operations.
Low Maintenance
The simple construction and corrosion-resistant material reduce wear and maintenance requirements.
Lightweight and Easy Installation
CPVC valves are lighter than metal valves, which makes installation, handling, and transportation easier.
Long Service Life
The valve has high durability and resistance to scaling, rust, and chemical damage, ensuring long operational life.
Contamination-Free Operation
The diaphragm separates the fluid from moving parts, preventing contamination and making it ideal for pharmaceutical and water treatment systems.
Good Chemical Compatibility
Suitable for handling a wide range of chemicals, acids, salts, and industrial fluids.
Cost-Effective Solution
Compared to metal valves, CPVC diaphragm cock valves offer lower installation and maintenance costs.
Types of CPVC Diaphragm Cock Valve
Manual CPVC Diaphragm Cock Valve
- Operated manually using a handwheel or lever.
- Commonly used in small and medium industrial piping systems for flow control.
Pneumatic CPVC Diaphragm Cock Valve
- Operated using compressed air through a pneumatic actuator.
- Suitable for automated industrial processes where remote operation is required.
Electric Actuated CPVC Diaphragm Cock Valve
- Uses an electric actuator to open or close the valve automatically.
- Ideal for automated control systems in water treatment and chemical plants.
Weir Type CPVC Diaphragm Cock Valve
- Features a raised weir (saddle) inside the valve body.
- Provides better sealing and is widely used for clean fluids and corrosive chemicals.
Straight Through CPVC Diaphragm Cock Valve
- Designed with a straight flow path that reduces pressure drop.
- Suitable for viscous fluids and slurry applications.
Threaded End CPVC Diaphragm Cock Valve
Comes with threaded connections for easy installation and removal.
Flanged End CPVC Diaphragm Cock Valve
Designed with flanged ends for larger pipeline systems and high-flow applications.
Featured List of Applications
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?
The Petron Thermoplast CPVC Diaphragm Cock Valve is easy to install. Extremely lightweight and compared to industrial connectors, but at the same time extremely durable, which can last you for decades to come. CPVC Diaphragm Cock Valve means no concern regarding Corrosion. Flow will be smoother and consistently more cost-effective in comparison to other components.
At Petron Thermoplast, we are committed to delivering high-quality CPVC Diaphragm Cock Valve products that meet industry standards and exceed customer expectations. Our products have been rigorously tested and certified through various tests to ensure their durability and performance. Petron thermoplast is a wide range of CPVC Diaphragm Cock Valves that can be used to extend the performance and versatility of our storage valves. Different sizes and types are available to suit various applications.
