UPVC Diaphragm Cock Valve

A UPVC Diaphragm Cock Valve is a manually controlled valve made from unplasticized polyvinyl chloride (uPVC) that uses a flexible diaphragm to regulate, start, stop, and throttle the flow of fluids. The diaphragm acts as a sealing element between the valve body and the operating mechanism, ensuring the leak-free operation and isolation of the fluid from moving parts. These valves are commonly used in Oil, gas supply systems, chemical handling, irrigation, and industrial piping because they are corrosion-resistant, lightweight, and low-maintenance.
The best UPVC Diaphragm Cock Valve has cylindrical or conically tapered “plugs” that may be moved inside the valve body to regulate flow. If a plug valve is open, fluid can flow through the plug. It is possible to control the flow of chemicals through an external pipe by using a UPVC Diaphragm Cock Valve. Since antiquity, they’ve been used to fluid control flow, and they’re one of the simplest methods available. The valve is typically operated manually with a handle, but it may also be remotely operated via other mechanisms. For preventing fluid/pressure from going beyond the UPVC Diaphragm Cock Valve, but can also be used for precise flow management, but these sorts of valves are less frequent.

UPVC Diaphragm Cock Valve Details

*Technical Drawing

*Technical Data

Parameter	Specification / Details
Valve Type	Diaphragm Cock Valve
Body Material	uPVC (Unplasticized Polyvinyl Chloride)
Diaphragm Material	EPDM / PTFE / Neoprene (Application dependent)
Operating Mechanism	Manual (Handwheel / Lever operated)
Size Range	15 mm to 100 mm (½″ to 4″)
Pressure Rating	PN 6 / PN 10 (Up to 10 bar)
Temperature Range	0°C to 60°C (uPVC limitation)
End Connection	Socket / Threaded / Flanged
Flow Control	On–Off / Precise Throttling
Sealing Method	Flexible diaphragm with weir seat
Leakage Class	Bubble-tight shutoff (Zero leakage)
Density (uPVC)	~1.40 g/cm³
Tensile Strength	40–60 MPa
Flexural Strength	60–80 MPa
Hardness (Shore D)	~80–85
Thermal Conductivity	Low (~0.19 W/m·K)
Water Absorption	Very low (<0.1%)
Corrosion Resistance	Excellent (Acids, alkalis, salts, and chemicals)
UV Resistance	Moderate (Shielding recommended for outdoor use)
Maintenance	Low (Replaceable diaphragm without removing body)
Weight	Lightweight (Significant reduction vs. metal valves)
Lifespan	15–25 Years (Under normal conditions)
Standards	IS / DIN / ASTM compliant

UPVC body construction
Provides excellent resistance to corrosion, chemicals, and rust.
Flexible diaphragm sealing
Ensures bubble-tight, leak-free shutoff.
Isolation of flow media
Fluid is completely separated from stem and operating parts.
Low maintenance design
Minimal moving components; diaphragm is easily replaceable.
Manual or actuated operation
Available in handwheel, lever, pneumatic, or electric actuation.
Wide chemical compatibility
Suitable for oil, gas, acids, alkalis, and corrosive fluids.
Lightweight and compact
Easier handling and installation compared to metal valves.
Smooth flow characteristics
Reduced pressure loss and minimal turbulence.
Good sealing at low pressure
Performs reliably even at low differential pressures.
Non-toxic material
Safe for potable chemical applications.
Versatile installation
Can be installed in any orientation.
Long service life
Durable materials ensure extended operational life.

PN Class	Maximum Working Pressure	Equivalent Rating
PN 6	6 bar	6 kg/cm²
PN 10	10 bar	10 kg/cm²
PN 12.5	12.5 bar	12.5 kg/cm²
PN 16	16 bar	16 kg/cm²

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 UPVC Diaphragm Cock Valve

Excellent corrosion resistance

Ideal for oil, gas, acids, alkalis, and chemical fluids.

Leak-proof operation

Flexible diaphragm provides bubble-tight shut-off.

Fluid isolation from moving parts

Media does not contact stem or actuator, increasing service life.

Low maintenance

Fewer moving parts; diaphragm is easy to replace.

Lightweight construction

Easier handling and installation compared to metal valves.

Cost-effective

Lower initial and maintenance cost than metal diaphragm valves.

Smooth flow path

Minimizes pressure loss and prevents contamination buildup.

Safe and reliable operation

Non-toxic and suitable for potable chemical applications.

Versatile installation

Can be installed in any orientation.

Good chemical compatibility

Suitable for aggressive and corrosive media.

Types of UPVC Diaphragm Cock Valve

1. Weir Type UPVC Diaphragm Cock Valve

Has a raised weir inside the valve body
Diaphragm presses down onto the weir to stop flow
Most commonly used type
Suitable for clean and moderately dirty fluids
Provides better sealing and longer diaphragm life

3. Manual Operated UPVC Diaphragm Cock Valve

Operated using handwheel or lever
Used where automatic control is not required
Simple and cost-effective

2. Straight-Through (Full Bore) UPVC Diaphragm Cock Valve

Straight flow path without weir
Lower pressure drop
Suitable for slurry, viscous, or dirty fluids
Slightly higher diaphragm wear compared to weir type

4. Pneumatically Operated UPVC Diaphragm Cock Valve

Actuated using compressed air
Suitable for automated and remote operations
Common in process industries

5. Electrically Operated UPVC Diaphragm Cock Valve

Uses electric actuator
Ideal for precise on/off control
Used in chemical treatment and automation systems

Why Choose Petron Thermoplast?

A Petron Thermoplast provides a UPVC Diaphragm Cock Valve keep connections simple and cost-effective. Selecting the right type depends on your UPVC Diaphragm Cock Valve setup, material, and pressure requirements. At Petron Thermoplast, we manufacture UPVC Diaphragm Cock Valve that meet ASME and MSS standards.