PVDF Flanged Diaphragm Valve
A PVDF Flanged Diaphragm Valve is a corrosion-resistant valve that uses a flexible diaphragm to control or isolate fluid flow in a pipeline. The valve body is made of PVDF (Polyvinylidene Fluoride) for chemical resistance, and it has flanged ends for bolted connection to piping systems. A PVDF Flanged Diaphragm Valve is a chemically resistant, quarter-turn valve with a flexible diaphragm that controls or isolates fluid flow, installed between flanged pipelines for safe and reliable operation in corrosive environments.
The PVDF Flanged Diaphragm Valve is ideal for use in chemical processing, pharmaceuticals, and ultra-pure oil and gas systems. Its flanged end design allows for easy integration into standard piping systems, while the diaphragm mechanism provides precise throttling and shut-off capabilities without direct contact between the actuator and the process fluid.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PVDF Flanged Diaphragm Valve Details
d – Tube Outside Diameter
DN – Nominal Diameter
PN – Nominal Pressure Rating
B – Overall Height of Valve
B1 – Bottom Clearance
C – Center to End Dimension
C1 – Center to Top Body Dimension
F – Flange Thickness
H – Face-to-Face Length H1 – Actuator Height
f – Flange Bolt Hole Diameter
U – Number of Bolt Holes
Ra – Surface Roughness
Sp – Spigot Diameter
| DN | PN | BB | B1 | CC | F | HH | H1 | f | U | Ra | Sp |
| 15 | 10 | 148 | 25 | 66 | 24 | 65 | 130 | 97 | 14 | 4 | 1/4” |
| 20 | 10 | 151 | 30 | 69 | 24 | 75 | 150 | 97 | 14 | 4 | 1/4” |
| 25 | 10 | 159 | 33 | 78 | 24 | 85 | 160 | 97 | 14 | 4 | 1/4” |
| 32 | 10 | 163 | 30 | 82 | 24 | 100 | 180 | 97 | 18 | 4 | 1/4” |
| 40 | 10 | 207 | 35 | 112 | 24 | 110 | 200 | 126 | 18 | 4 | 1/4” |
| 50 | 10 | 245 | 46 | 142 | 24 | 125 | 230 | 157 | 18 | 4 | 1/4” |
| Technical Parameter | Specification |
| Body Material | PVDF (Polyvinylidene Fluoride) |
| Seal Material | EPDM, FKM, or PTFE (as per media compatibility) |
| Valve Type | Flanged Check Valve |
| Connection Type | Flanged (ANSI, DIN, JIS standards) |
| Size Range | 15 mm to 300 mm |
| Pressure Rating | PN 10 to PN 16 |
| Temperature Range | -40°C to +140°C (depending on seal material) |
| Cracking Pressure | Typically 0.3 to 0.5 bar |
| Installation Position | Horizontal or vertical (flow direction upwards preferred) |
| Flow Direction | Unidirectional |
| Standards Compliance | ISO, ANSI, DIN (model dependent) |
Corrosion-Resistant Body: Made entirely from PVDF for outstanding resistance to harsh chemicals and UV exposure.
Stable Pressure Control: Maintains consistent downstream pressure regardless of inlet pressure fluctuations.
Self-Actuating: Operates without external power, using internal spring mechanisms for automatic pressure regulation.
Compact Design: Lightweight and easy to install in tight spaces.
Adjustable Setpoint: Outlet pressure can be adjusted to match system requirements.
Smooth Flow Control: Minimizes pressure surges and water hammer effects.
Low Maintenance: Durable materials ensure long service life with minimal upkeep.
Wide Application Range: Suitable for aggressive chemical media, ultra-pure fluids, and corrosive environments.
1. Standard Pressure Ratings at 20–25°C
| Valve Size (DN / Inch) | ANSI Standard | Max Working Pressure (psi) | DIN Standard | Max Working Pressure (bar) |
| DN15–DN50 (½″–2″) | Class 150 | 150 psi | PN10 | 10 bar |
| DN65–DN100 (2½″–4″) | Class 150 | 150 psi | PN10 | 10 bar |
| DN125–DN200 (5″–8″) | Class 150 | 150 psi | PN10 | 10 bar |
| DN250–DN300 (10″–12″) | Class 150 | 150 psi | PN10 | 10 bar |
2️. Pressure–Temperature Derating for PVDF Body
| Temperature (°C) | Approx. Allowable Pressure (bar) |
| 20°C | 10 bar |
| 40°C | 8 bar |
| 60°C | 6–7 bar |
| 80°C | 5–6 bar |
| 100°C | 4 bar |
| 120°C | 2–3 bar |
1. Physical Properties
| Property | Typical Value | Unit |
| Material Type | Thermoplastic Fluoropolymer | — |
| Density | 1.75 – 1.80 | g/cm³ |
| Tensile Strength | 35 – 55 | MPa |
| Flexural Modulus | 1,200 – 1,700 | MPa |
| Hardness | Shore D 75 – 80 | — |
| Melting Point | 170 – 177 | °C |
| Max. Service Temperature | 120 – 140 | °C |
| Thermal Conductivity | ~0.19 | W/m·K |
| Water Absorption (24 hrs) | <0.05 | % |
2️. Diaphragm Material – Physical & Mechanical Properties
| Material | Max Temperature | Chemical Resistance | Hardness | Typical Use |
| PTFE | 180–200°C | Excellent | Shore D 50–65 | Strong acids, solvents |
| EPDM | 110–120°C | Good | Shore A 60–80 | Water, mild chemicals |
| Viton (FKM) | 150–200°C | Excellent | Shore A 70–85 | High temp chemicals |
| Silicone | 120–150°C | Moderate | Shore A 40–60 | High purity, food, pharma |
3️. Flanged Connection / Hardware
| Component | Material | Properties |
| Flange / Bonnet Bolts | Stainless Steel / Alloy | Corrosion resistant, mechanical strength |
| Handwheel / Actuator | PVDF / Coated Metal | Lightweight, smooth operation |
| Valve Stem | Alloy Steel / Stainless Steel | High torque and wear resistance |
4️. General Valve Physical Characteristics
| Feature | Typical Range | Application / Detail |
| Valve Size | DN15 – DN300 (½″–12″) | Wide range for pilot plants to large industrial lines |
| Pressure Rating | PN10 / ANSI Class 150 | Standard industrial pressure classes |
| Operation | Manual, Lever, Pneumatic, Electric | Adaptive to manual or fully automated systems |
| Flow Control | Bubble-tight shut-off or throttling | Ideal for both isolation and precise flow regulation |
| Installation | Horizontal or vertical piping | Flexible orientation; vertical requires upward flow |
| End Connection | Flanged (ANSI, DIN, JIS) | Universal compatibility with global piping standards |
1️. Based on Actuation (Operation Type)
| Type | Description | Application |
| Manual Handwheel | Operated by handwheel for opening/closing | Small-to-medium pipelines, low-frequency operation |
| Lever Operated | Quick open/close using lever | Simple systems, on/off control |
| Pneumatic Actuated | Air pressure actuates diaphragm | Automated process control |
| Electric Actuated | Electric motor drives diaphragm | Remote control and process automation |
2️. Based on Diaphragm Material
| Material | Features | Application |
| PTFE | Excellent chemical resistance, suitable for strong acids and solvents | Harsh chemicals, strong oxidizers, high-purity solvents |
| EPDM | Good for water, mild chemicals, and acids | Water treatment, cooling systems, dilute acids |
| Viton (FKM) | High chemical and temperature resistance | High-temperature fluids, oils, hydrocarbons, and fuels |
| Silicone | Flexible, suitable for high-purity applications | Food and beverage, pharmaceutical, low-pressure medical use |
3️.Based on Body Design
| Type | Features | Application |
| One-Piece PVDF Body | Entire valve made of PVDF, corrosion resistant | High-purity chemicals, ultra-corrosive environments |
| PVDF-Lined Metal Body | Metal body lined internally with PVDF for extra mechanical strength | High-pressure systems requiring chemical inertness |
| Straight-Through Design | Low pressure drop, suitable for full flow | Slurries, viscous fluids, or high-flow requirements |
| Weir-Type Design | Shorter diaphragm travel, better for throttling | Precise flow control and sterile/hygienic applications |
4️. Based on Flow Characteristics
| Type | Features | Application |
| Weir-Type Diaphragm Valve | Fluid flows over a weir; shorter diaphragm travel; suitable for throttling and viscous fluids | Precise flow control, sterile applications, and high-cycle operation |
| Straight-Through (Full Port) | Fluid passes straight; minimal pressure drop; good for slurries or high flow | Sludge/wastewater, abrasive media, and systems requiring maximum flow capacity |
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 PVDF Flanged Diaphragm Valve
1️. Excellent Corrosion Resistance
- The PVDF body is highly resistant to acids, alkalis, salts, and aggressive chemicals.
- Diaphragm (PTFE or EPDM) provides additional chemical isolation.
- Ideal for highly corrosive fluid systems.
2️. Bubble-Tight Shut-Off
- Flexible diaphragm ensures leak-free sealing, even at low pressures.
- Suitable for throttling or complete isolation.
- Reduces risk of contamination in chemical and pharmaceutical systems.
3️. Low Maintenance
- No exposed metal parts in contact with fluid → minimal corrosion or scaling.
- Diaphragm The diaphragmeable without removing the valve from the pipeline.
- Reduced downtime and maintenance costs.
4️. Easy Operation
- A manual handwheel or lever provides smooth control.
- Optional pneumatic or electric actuators available are for automation.
- Suitable for frequent opening/closing cycles.
5️. High Purity & Clean Handling
- PVDF and PTFE/EPDM diaphragm
- Ideal for pharmaceutical, food, or high-purity chemical processes.
6️. Pressure & Temperature Handling
- Handles moderate pressures (up to ~10 bar at ambient temperature).
- Can operate at temperatures up to 120°C depending on diaphragm material.
7️. Flexible Installation
- Flanged ends allow easy connection to ANSI, DIN, or JIS standard piping.
- A compact body fits space-limited systems.
Types of PVDF Flanged Diaphragm Valve
1. Diaphragm-Type PVDF Pressure Reducing Valve
- Uses a flexible diaphragm to regulate downstream pressure.
- Precise pressure control, minimal leakage, ideal for corrosive fluids and clean applications.
- Chemical processing, pharmaceutical systems.
2. Spring-Loaded PVDF Pressure Reducing Valve
- A spring opposes fluid pressure to maintain the set downstream pressure.
- Simple design, easy to adjust, reliable in continuous operation.
- Oil & gas treatment, industrial piping systems.
3. Threaded PVDF Pressure Reducing Valve
- Standard valve body with threaded connections for pipes.
- Compact, easy to install or replace in small to medium pipelines.
- Laboratory setups, small chemical lines.
4. Flanged PVDF Pressure Reducing Valve
- Flanged ends for bolted connections to pipeline flanges.
- Suitable for large-diameter pipelines, robust sealing.
- Industrial chemical plants, large-scale oil & gas treatment.
5. Multi-Stage or Adjustable PVDF Pressure Reducing Valve
- Allows adjustment of outlet pressure, sometimes with multiple stages for high-pressure drops.
- Precise control over a wide range of pressures.
- High-precision chemical dosing systems, semiconductor manufacturing.
6. Pilot-Operated PVDF Pressure Reducing Valve
- Uses a small pilot valve to control the main valve for high flow or high-pressure applications.
- Handles large flow rates with stable outlet pressure.
- Large industrial processes where consistent pressure is critical.
Why Choose Petron Thermoplast?
At Petron Thermoplast, we understand the importance of quality fittings for your projects. That’s why we offer a comprehensive selection of PVDF Flanged Diaphragm Valve in various sizes, including 10mm, 15mm, 22mm, and 28mm, from reputable brands. Choosing a PVDF Flanged Diaphragm Valve from Petron Thermoplast supplier can have several advantages over traditional fittings. Here are some reasons why:
Space Efficiency
PVDF Flanged Diaphragm Valves take up less space in tight environments, as they neatly connect different pipe sizes. This can be particularly beneficial in commercial areas where space is limited.
Fluid Flow Optimization
By allowing the smooth transition from a larger pipe to a smaller one,PVDF Flanged Diaphragm Valve minimizes flow turbulence, making the system more efficient.
Cost-Effective Solutions
Using a PVDF Flanged Diaphragm Valve can often save you money in materials and labor, as you can eliminate the need for multiple fittings.
Versatility
PVDF Flanged Diaphragm Valve can adapt to various piping configurations, making them suitable for a variety of applications, from irrigation to industrial use.
