UPVC Flanged Diaphragm Valve
The UPVC Flanged Diaphragm Valve is engineered to provide flow control precise and reliable shut-off in systems handling corrosive, abrasive, or viscous fluids. This valve type uses a flexible diaphragm, which isolates the flow media from internal components, ensuring durability and preventing contamination. UPVC Flanged Diaphragm Valves are compact, versatile components that control the rate and volume of fluid flow throughout a piping system. These valves feature a rubber diaphragm that moves up and down within the valve body to open or close the valve position.
UPVC Flanged Diaphragm Valves are easy to install at virtually any point of a closed piping system. UPVC Flanged Diaphragm Valve features a sturdy flange at either end of the fitting, rather than a threaded connection or socket-style ending. We specialize in creating high-quality, reliable diaphragm flanged valves for various industries and applications.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
UPVC Flanged Diaphragm Valve Details
B: Vertical height from the pipe centerline
B1: Vertical distance from the pipe centerline F: Diameter of the flange bolt hole circle.
f: Diameter of the individual flange bolt holes.
H: Overall face-to-face length of the flanged valve.
H1: Width or diameter of the handwheel/top assembly.
Sp: Thickness of the flange.
| Size | B | B1 | H | H1 | F | Sp | U | f |
| 1/2” | 102 | 25 | 108 | 80 | 60.3 | 13.5 | 4 | 14 |
| 3/4” | 105 | 30 | 150 | 80 | 69.9 | 13.5 | 4 | 15.7 |
| 1” | 114 | 33 | 160 | 80 | 79.4 | 14 | 4 | 15.7 |
| 1-1/4” | 119 | 30 | 180 | 80 | 88.9 | 14 | 4 | 15.7 |
| 1-1/2” | 147 | 35 | 200 | 120 | 98.4 | 16 | 4 | 15.7 |
| 2” | 172 | 46 | 230 | 120 | 120.7 | 16 | 4 | 19 |
| 2-1/2” | 172 | 46 | 290 | 120 | 139.7 | 21 | 4 | 19 |
| 3” | 226 | 64 | 310 | 200 | 160 | 21.5 | 8 | 18 |
| 4” | 295 | 72 | 350 | 250 | 180 | 22.5 | 8 | 18 |
| Parameter | Specification / Details |
| Valve Type | Diaphragm Valve (Weir / Straight-through type) |
| Body & Bonnet Material | UPVC (Unplasticized Polyvinyl Chloride) |
| Diaphragm Material | PTFE / EPDM |
| Size Range | DN15 (½”) to DN200 (8”) |
| Pressure Rating | Up to 6–10 bar (Size & Temp dependent) |
| Temperature Range | 0°C to 60°C |
| End Connection | Flanged (ANSI / DIN / BS standards) |
| Operation Type | Manual (Handwheel) / Optional Actuated |
| Flow Control | On/Off and Precise Throttling |
| Sealing Mechanism | Flexible diaphragm against body seat |
| Leakage Class | Bubble-tight shut-off |
| Stem Material | Stainless Steel / Alloy Steel |
| Compressor / Plate | UPVC / Stainless Steel |
| Fasteners | Stainless Steel / Galvanized Steel |
| Handwheel Material | ABS / Alloy Material |
| Lining Options | EPDM / Rubber (Optional) |
| Standards | ISO / ASTM / DIN compliant |
Precise Flow Control: Ideal for throttling and on/off operations with smooth flow adjustment.
Flanged Ends: Easy and secure integration into flanged piping systems for industrial use.
Non-Metallic Design: Suitable for highly corrosive and aggressive fluids.
Leak-Proof Diaphragm Seal: Prevents media contamination and ensures complete shut-off.
High Chemical Resistance: Inert UPVC body and diaphragm materials withstand harsh chemicals.
Maintenance-Friendly: Easy to dismantle for cleaning, inspection, and diaphragm replacement.
Compact & Lightweight: Simplifies installation in confined spaces and on vertical or horizontal pipelines.
| Valve Size | Temperature Range | Working Pressure (UPVC) | Equivalent |
| ½″ (DN15) | 20–40 °C | 0.8 MPa | ~8 bar / 116 psi |
| 41–60 °C | 0.8 MPa | ~8 bar / 116 psi | |
| 61–80 °C | 0.7 MPa | ~7 bar / 102 psi | |
| ¾″ (DN20) | 20–40 °C | 0.8 MPa | ~8 bar / 116 psi |
| 41–60 °C | 0.8 MPa | ~8 bar / 116 psi | |
| 61–80 °C | 0.7 MPa | ~7 bar / 102 psi | |
| 1″ (DN25) | 20–40 °C | 0.8 MPa | ~8 bar / 116 psi |
| 41–60 °C | 0.8 MPa | ~8 bar / 116 psi | |
| 61–80 °C | 0.7 MPa | ~7 bar / 102 psi | |
| 1¼″ (DN32) | 20–40 °C | 0.7 MPa | ~7 bar / 102 psi |
| 41–60 °C | 0.7 MPa | ~7 bar / 102 psi | |
| 61–80 °C | 0.6 MPa | ~6 bar / 87 psi | |
| ≥ Larger sizes | Typical flanged valves | Generally PN10 (10 bar) | ~10 bar / 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 UPVC Flanged Diaphragm Valve
1. Excellent Corrosion Resistance
- UPVC (Unplasticized Polyvinyl Chloride) is highly resistant to acids, alkalis, and other chemicals.
- Ideal for chemical processing, water treatment, and corrosive media pipelines.
- Longer service life in aggressive environments compared to metal valves.
2. Leak-proof Operation
- Flanged Diaphragm valve design ensures a tight seal even at low pressures.
- No direct contact between the fluid and valve stem, reducing leakage risks.
- Suitable for handling slurries, viscous fluids, or abrasive media.
3. Low Maintenance
- Simple design with fewer moving parts.
- Flanged Diaphragm Valve is the only wear part; replacement is easy and inexpensive.
- Resistant to scale and sediment buildup, minimizing cleaning requirements.
4. Lightweight
- UPVC flanged diaphragm valves are much lighter than metal equivalents.
- Easier to install, handle, and transport.
- Reduces the structural support requirements in piping systems.
5. Smooth Flow & Minimal Pressure Drop
- The straight-through flow path reduces turbulence.
- UPVC flanged diaphragm valve fully retracts in the open position, allowing smooth fluid passage.
- Efficient for gravity-fed or low-pressure systems.
6. Cost-Effective
- Lower material and production cost than cast iron valves.
- Less frequent maintenance reduces lifecycle costs.
- Ideal for large-scale chemical or water distribution networks.
7. Suitable for On/Off and Throttling
- Can be used to fully stop flow or regulate it with precision.
- Flanged Diaphragm control allows fine adjustment in flow rates.
8. Non-Toxic & Safe for Drinking Water
- UPVC flanged diaphragm is approved for potable water use in many regions.
- Does not leach harmful substances into water or chemicals.
9. Wide Temperature and Pressure Range for Plastic Valves
- Typically rated up to PN10 (≈10 bar) at ambient temperature.
- Can handle temperatures up to ~60–80°C depending on design.
10. Easy Integration with Flanged Piping
- Flanged ends allow quick installation and removal.
- Standard flange dimensions (DIN, ANSI, JIS) make retrofitting easier.
Types and Uses of UPVC Flanged Diaphragm Valve
Based on Actuation Method
Manual UPVC Flanged Diaphragm Valve
- Operated by hand using a handwheel.
- Simple design, cost-effective, and widely used in smaller pipelines.
- Ideal for systems where frequent opening and closing are not required
Pneumatic Actuated UPVC Flanged Diaphragm Valve
- Uses compressed air to operate a piston or diaphragm actuator.
- Offers fast and precise control for larger pipelines.
- Can be single-acting (spring return) or double-acting (air-to-open, air-to-close).
Electric Actuated UPVC Flanged Diaphragm Valve
- Uses an electric motor to actuate the valve.
- Suitable for automation in process plants.
- Often integrated with remote control or process control systems.
Based on Diaphragm Material
The diaphragm material is chosen based on fluid type and temperature:
- EPDM – Good for water, acidic, or alkaline solutions.
- PTFE (Teflon) – Excellent chemical resistance; used for aggressive chemicals.
- NBR (Buna-N) – Suitable for oils and hydrocarbons.
- Silicone – For high-temperature fluids.
Based on Flow Control Type
On/Off (Shut-Off) Diaphragm Valve
- Used to completely stop or allow flow.
- Not ideal for throttling, as the diaphragm can wear out with partial flow.
Throttling (Control) Diaphragm Valve
- Can regulate flow to some degree.
- Requires careful diaphragm selection to ensure durability.
Based on Flow Control Type
Weir Type (Common)
- The diaphragm presses against a raised weir inside the valve body.
- Provides good throttling performance and reduces turbulence.
- Easier to replace the diaphragm without removing the valve.
Straight-Through (Full Bore / Full Port) Type
- The diaphragm presses directly down without a weir.
- Offers minimal pressure drop, suitable for slurry or viscous fluids.
- Better for full flow applications.
Why Choose Petron Thermoplast?
The Petron Thermoplast UPVC Flanged diaphragm valve is a versatile and reliable type of valve that is used in a variety of industrial applications. They offer precise over fluid flow control, are easy to maintain, and are available in a variety of materials and configurations. While they may not be suitable for use in high-temperature or high-pressure applications.
They are an ideal choice for applications requiring precise control over fluid flow and low maintenance requirements. When it comes to industrial-grade systems, the choice of the right manufacturer is as important as the material itself. Petron Thermoplast has earned a reputation as a trusted global leader in the field of UPVC flanged diaphragm valves and industrial flow solutions. Our products are known for precision, performance, and durability, designed to meet the most demanding industry standards across the chemical and infrastructure sectors.
