CPVC Diaphragm Valve
A CPVC Diaphragm Valve is a flow control valve made from Chlorinated Polyvinyl Chloride (CPVC) material that uses a flexible diaphragm to regulate, start, or stop the flow of liquids in a piping system. The valve operates by pressing a soft diaphragm against a weir or seat inside the valve body. When the handwheel or actuator is operated, the diaphragm moves up or down to control the flow. A CPVC Diaphragm Valve is a corrosion-resistant plastic valve that controls fluid flow using a flexible diaphragm mechanism.
CPVC Diaphragm Valves are on-off throttle valves that operate in both directions. They are used to regulate the area through which media can enter and exit the valve, thus changing its speed and velocity. The valves are used in pharmaceutical filling systems and have the advantage of having 150 mil life opening and closing times at 3 bar operating pressure. Liquid sampling, biological systems, labs, and other initiatives all use it.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
CPVC Diaphragm Valve Details
DN: Nominal Diameter Size
D: Flange Outer Diameter
b: Flange Thickness Dimension
k: Bolt Circle Diameter
h: Number of Holes
d: Pipe Outside Diameter
H: Total Valve Length
H1: Handwheel Outer Diameter
B: Center to Top
B1: Center to Bottom
| Size (DN) | Size (Inch) | D | b | k | h | d | Weight (kg) |
| 15 | 1/2″ | 95 | 14 | 65 | 45 | 14 | 0.8 |
| 20 | 3/4″ | 105 | 16 | 75 | 50 | 14 | 1.0 |
| 25 | 1″ | 115 | 16 | 85 | 52 | 14 | 1.2 |
| 32 | 1 1/4″ | 140 | 18 | 100 | 55 | 18 | 1.9 |
| 40 | 1 1/2″ | 150 | 18 | 110 | 58 | 18 | 2.3 |
| 50 | 2″ | 165 | 20 | 125 | 62 | 18 | 3.1 |
| Parameter | Specification |
| Material (Body) | CPVC (Chlorinated Polyvinyl Chloride) |
| Diaphragm Material | EPDM / PTFE (Teflon) / FKM (Viton) |
| Bonnet Material | CPVC / PP (Polypropylene) |
| Valve Type | Weir Type / Straight Through Type |
| Operation | Manual (handwheel) / Pneumatic / Electric Actuated |
| Nominal Size Range | ½” to 12” (DN15 – DN300) |
| Connection Types | Socket, Threaded, Flanged, Union |
| End Standards | ASTM, DIN, BS, ANSI |
| Pressure Rating | PN6 / PN10 / PN16 |
| Max Working Pressure | Up to 10–16 bar (depending on size & temperature) |
| Temperature Range | 0°C to 95°C (up to ~120°C for limited conditions) |
| Flow Control | Linear throttling capability |
| Sealing Type | Soft sealing (flexible diaphragm) |
| Leakage Class | Bubble-tight shut-off |
| Standards | ASTM D1784, ISO 9393 |
| Actuation Options | Gear, pneumatic actuator, electric actuator |
| Density | ~1.45–1.58 g/cm³ |
| Color | Grey / Off-white |
| Corrosion Resistance | Excellent against acids, alkalis, salts |
| Chemical Resistance | Suitable for aggressive and hazardous chemicals |
| Surface Finish | Smooth internal surface → low friction loss |
| Thermal Resistance | Higher heat resistance than PVC |
| Mechanical Strength | Good tensile and impact strength |
| Weight | Lightweight compared to metal valves |
| Durability | Long service life, non-corrosive |
| UV Resistance | Moderate (improved with additives) |
| Hygienic Properties | Suitable for clean and sterile applications |
1️. Corrosion-Resistant Body
Manufactured from CPVC, providing excellent resistance to acids, alkalis, and corrosive chemicals.
2️. Flexible Diaphragm Sealing
Uses EPDM or PTFE diaphragm for tight shut-off and leak-proof performance.
3️. High Temperature Capability
Suitable for handling fluids up to approximately 90°C.
4️. Smooth Internal Surface
Reduces pressure drop and prevents scaling or buildup inside the valve.
5️. No Metal Contact with Fluid
Prevents contamination and internal corrosion.
6️. Throttling & Shut-Off Function
Allows both flow regulation and complete isolation.
7️. Low Maintenance Design
Simple construction with minimal moving parts.
8️. Manual or Actuated Operation
Available with a handwheel or pneumatic actuator for automation.
9️. Compact & Lightweight
Easy to install compared to metal diaphragm valves.
- Chemical Compatibility
Suitable for chemical processing, water treatment, and industrial fluid systems
| Valve Size | Nominal Pressure (PN) | Working Pressure @ 23°C | Working Pressure @ 60°C | Working Pressure @ 90°C |
| ½” (15 mm) | PN16 | 16 Bar | 10–12 Bar | 6–8 Bar |
| ¾” (20 mm) | PN16 | 16 Bar | 10–12 Bar | 6–8 Bar |
| 1″ (25 mm) | PN16 | 16 Bar | 10–12 Bar | 6–8 Bar |
| 1½” (40 mm) | PN10 / PN16 | 10–16 Bar | 8–10 Bar | 5–6 Bar |
| 2″ (50 mm) | PN10 / PN16 | 10–16 Bar | 8–10 Bar | 5–6 Bar |
| 3″ (80 mm) | PN10 | 10 Bar | 6–8 Bar | 4–5 Bar |
| 4″ (100 mm) | PN10 | 10 Bar | 6–8 Bar | 4–5 Bar |
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 Valve
Excellent Corrosion Resistance
Made from CPVC material, it resists acids, alkalis, and aggressive chemicals.
Leak-Proof Operation
Flexible diaphragm provides tight sealing and prevents leakage.
Suitable for Corrosive & Slurry Media
Ideal for handling abrasive and contaminated fluids.
High Temperature Resistance
Can handle fluids up to approximately 90°C.
Precise Flow Control
Allows throttling as well as complete shut-off.
Low Maintenance
Simple construction with fewer moving parts reduces maintenance costs.
No Metal Contact with Fluid
Prevents contamination and corrosion inside the valve.
Smooth Internal Surface
Reduces pressure drop and prevents scaling buildup.
Long Service Life
Durable construction ensures reliable long-term performance.
Available with Manual or Actuated Operation
It can be operated manually or with a pneumatic actuator for automation.
Types of CPVC Diaphragm Valve
1️. Weir Type (Saddle Type) CPVC Diaphragm Valve
- Most common type
- Has a raised weir (saddle) inside the body
- Suitable for throttling and shut-off applications
- Ideal for clean and slightly contaminated fluids
2️. Straight Through Type CPVC Diaphragm Valve
- Full-bore design without a raised weir
- Suitable for slurry and viscous fluids
- Lower pressure drop compared to the weir type
- Common in abrasive applications
3️. Manual Operated CPVC Diaphragm Valve
- Operated by handwheel
- Simple and economical
- Suitable for general industrial use
4️. Pneumatic Actuated CPVC Diaphragm Valve
- Operated using an air actuator
- Suitable for automated systems
- Used in chemical and process industries
5️. Flanged CPVC Diaphragm Valve
- Flanged end connections
- Used for larger diameter pipelines
- Suitable for higher flow systems
6️. Threaded / Socket Type CPVC Diaphragm Valve
- BSP/NPT threaded or solvent-weld ends
- Easy installation in small pipelines
- Common in water treatment and chemical systems
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?
Petron Thermoplast is one of the trusted CPVC Diaphragm Valve manufacturers and suppliers in India, delivering high-performance mechanical splicing solutions for civil and structural engineering sectors. Our CPVC Diaphragm Valve is crafted using certified materials and advanced machining processes to be strong and reliable, ensuring the connections in every project.
