PVDF Foot Valve
A PVDF foot valve is a type of check valve installed at the inlet (foot) of a suction pipe in a pumping system, typically submerged in a tank or pump, and made from PVDF (Polyvinylidene Fluoride) for excellent chemical resistance. A PVDF foot valve is a chemical-resistant, corrosion-proof valve fitted at the suction end of a pump, designed to allow the fluid to flow into the pump from a storage tank or reservoir. They prevent backflow of liquid when the pump is stopped, maintaining the pump’s prime withstand harsh chemical environments, making it suitable for acids, alkalis, and solvents.
PVDF Foot Valve will there be no gravity after the pump is turned off, and all the gas will go back to its tank after the pump is turned off. The PVDF foot valve is located at the end of a pipeline. In addition to serving as a check valve, these also include a strainer attached to the open end of the valve. Whenever a pump is turned on, the tension of the pump column changes, and the valve opens as a result. As a result, the pump will not lose prime every time it is turned off due to leakage of fluid from the pump column.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PVDF Foot Valve Details
*Technical Drawing
*Technical Data
| Parameter | Details |
| Product Type | Foot Valve (Non-return valve with strainer) |
| Material (Body) | Polyvinylidene Fluoride (PVDF) |
| Valve Type | Check valve (Ball type / Spring type) |
| Construction | One-piece / Two-piece full flow design |
| Function | Prevents backflow and maintains pump priming |
| Manufacturing Method | Injection moulded / machined |
| Connection Type | Threaded / Socket / Flanged (DIN/ANSI) |
| Available Sizes | DN15 to DN100 (½″ to 4″) |
| Pressure Rating | Up to PN10 (10 bar / ~150 PSI) |
| Operating Pressure | Typically 0.5 – 10 bar (depends on size/design) |
| Operating Temperature | -10°C to +120°C |
| Cracking Pressure | ~0.3 – 0.5 bar |
| Flow Direction | Unidirectional (one-way flow) |
| Strainer Type | Built-in mesh / basket / slotted screen |
| Ball / Disc Material | PVDF / PTFE / Ceramic (optional) |
| Seal Material | EPDM / FPM (Viton) / PTFE |
| Density (PVDF) | ~1.75 – 1.78 g/cm³ |
| Tensile Strength | ~35 – 50 MPa |
| Chemical Resistance | Excellent (acids, alkalis, solvents, oxidizers) |
| Thermal Stability | High (suitable for elevated temperatures) |
| UV Resistance | Excellent (outdoor applications) |
| Surface Finish | Smooth internal flow path (low friction loss) |
| Installation Position | Vertical (at suction pipe bottom) |
| Design Feature | Integrated strainer + non-return mechanism |
| Working Principle | Opens under suction, closes when flow stops |
| Applications | Pump suction lines, chemical dosing, water treatment |
Maintains Pump Prime
- Prevents backflow in suction lines.
- Keeps the pump filled with liquid, reducing the risk of dry-running.
High Purity
- PVDF body and diaphragm do not leach metals
- Smooth internal surfaces prevent particle buildup.
- Suitable for pharmaceutical, semiconductor, and ultra-pure chemical systems.
Leak-Proof Design
- The diaphragm or flap/check mechanism ensures tight sealing.
- Prevents fluid loss and contamination.
Lightweight and Compact
- Easy to handle and install.
- Fits in tight spaces, ideal for lab setups or small pumping systems.
Low Maintenance
- Few moving parts → minimal wear and tear.
- The diaphragm and strainer are easy to replace.
Corrosion-Free and Durable
- PVDF material does not rust or corrode.
- Long-lasting even in harsh chemical environments.
Versatile Connection Options
- Available with threaded, flanged, or socket/union connections.
- Compatible with various piping systems.
Strainer Protection
- Often integrated with a strainer to prevent debris from entering the pump.
Temperature and Pressure Capability
- Operates up to 90°C and 6 bar, depending on valve size and diaphragm material.
| Valve Size (DN / Inch) | Max Operating Pressure (Bar) | Max Operating Temperature (°C) | Notes |
| DN10 / 3/8″ | 6 | 90 | Standard PVDF body with PTFE/EPDM diaphragm |
| DN15 / 1/2″ | 6 | 90 | Common mini foot valve size for lab or small industrial use |
| DN20 / 3/4″ | 6 | 90 | Pressure may reduce at higher temperatures |
| DN25 / 1″ | 5–6 | 90 | Slightly lower pressure at elevated temperatures |
| DN32 / 1¼″ | 5 | 90 | Larger valves have a slightly lower pressure rating due to the diaphragm size |
| DN40 / 1½″ | 5 | 90 | PVDF material maintains chemical resistance, but pressure must be monitored |
| DN50 / 2″ | 4–5 | 90 | Maximum pressure depends on the diaphragm and installation |
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 Foot Valve
Excellent Chemical Resistance
- Resistant to strong acids, alkalis, oxidizers, and most solvents.
- Ideal for aggressive chemical handling.
Maintains Pump Prime
- Prevents backflow in suction lines.
- Ensures the pump remains filled, avoiding dry-running.
High Purity & Low Contamination
- PVDF does not leach metals.
- Smooth internal surfaces reduce particle buildup.
- Suitable for pharmaceutical and ultra-pure water applications
Leak-Proof Design
- The diaphragm/check mechanism ensures tight sealing.
- Prevents fluid loss and contamination.
Lightweight & Compact
- Easy to handle and install.
- Fits in tight spaces for lab or industrial setups.
Low Maintenance
- Fewer moving parts → minimal wear.
- The diaphragm and strainer are easy to replace.
Corrosion-Free & Durable
- PVDF does not rust or corrode.
- Long-lasting performance even in harsh environments.
Versatile Applications
- Suitable for chemical tanks, pumps, lab setups, and industrial piping.
Types of PVDF Foot Valve
1. Based on Valve Mechanism
- Spring-Loaded Foot Valve
- Uses a spring-loaded flap or disc to automatically close when the pump stops.
- Ensures immediate backflow prevention.
- Common in chemical and industrial applications.
- Diaphragm-Type Foot Valve
- Uses a flexible PVDF or PTFE diaphragm to seal the flow.
- Provides leak-proof performance for aggressive chemicals.
- Suitable for high-purity or corrosive fluid systems.
- Flap/Disc Type Foot Valve
- Uses a simple hinged flap or disc that closes by gravity when the flow stops.
- Common for small pumps or low-pressure applications.
- Simple, reliable, and low-cost.
2. Based on Connection Type
- Threaded PVDF Foot Valve
- NPT or BSPT threaded ends.
- Easy to install in small piping systems.
- Flanged PVDF Foot Valve
- Flanged ends for secure chemical piping connections.
- Used in larger systems where stronger sealing is needed.
- Socket/Butt Fusion PVDF Foot Valve
- Ends are welded to PVDF piping for leak-proof joints.
- Ideal for high-purity chemical systems.
3. Based on Strainer/Filter Design
- Built-in Strainer Foot Valve
- PVDF or SS316 mesh integrated into the valve.
- Prevents debris from entering the pump.
- Common for chemical tanks and outdoor sump applications.
- External Strainer Foot Valve
- Strainer mounted separately from the valve.
- Easier to replace or clean without removing the valve.
4. Based on Application
- Mini PVDF Foot Valve
- Small-sized for laboratory or pilot-scale chemical setups.
- Compact, lightweight, easy to install.
- Industrial PVDF Foot Valve
- Larger sizes for chemical plants, water treatment, or corrosive fluid systems.
- Can handle higher flow rates while maintaining chemical resistance.
Applications of PVDF Foot Valve
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 provides the PVDF Foot Valve, which is not simply an upgraded version of a foot valve but a specialized valve designed for piping systems with high maintenance and stability requirements. Its double-joint structure achieves:
Quick assembly and disassembly
Reduced maintenance costs
Improved system reliability
Extended pipeline lifespan
In modern plastic piping engineering, double-joint PVDF Foot Valves have become a standard feature in oil, gas treatment, chemical, agricultural, and industrial fluid systems.
