The RETZ brand imported PVC flange diaphragm valve is a commonly used shut-off valve in corrosion-resistant pipeline systems. Its simple and durable design makes it particularly suitable for handling corrosive, high-purity, or particle-containing media, making it an ideal choice for liquid and gas flow control. Its unique performance allows it to excel in numerous fields.

Working Principle

Opening the valve: Rotate the handwheel or pneumatic device to lift the diaphragm, allowing the medium to flow through.

Closing the valve: The diaphragm is pressed down against the valve seat, cutting off the flow path, similar to pinching a water hose.

Why Choose "Imported" Brands?

Imported PVC diaphragm valves (brands such as +GF+ Georg Fischer (USA), STUBBE (Germany), RETZ (USA), FIP (Italy)) typically feature superior materials (aging-resistant, corrosion-resistant) and more reliable sealing (longer lifespan).

UPVC and CPVC plastic diaphragm valves can be operated manually or pneumatically. Opening and closing are achieved through the up-and-down movement of the valve stem. When the valve stem is in the upper position, the curved diaphragm bends upward, allowing the valve to open. When the valve stem moves downward, it drives the pressure plate to bend the diaphragm, pressing it against the valve seat sealing area to close the valve. RETZ UPVC and CPVC plastic diaphragm valves can be operated manually or 

The lower valve body cavity and upper valve cover cavity of UPVC, CPVC, and PVDF plastic diaphragm valves are separated, ensuring that components such as the valve stem and disc above the diaphragm are not corroded by the medium. This eliminates the need for a packing seal structure and prevents medium leakage.

Specification: 1/2" - 6"

Temperature Range: 0 - 80°C

Pressure: 10 bar (145 PSI)

Control: Manual, Pneumatic, Electric

Now, let us unveil the mystery of this "plastic door" and explore its details.

The Realm of Common Sense—Unveiling the Flange PVC Diaphragm Valve

Material Choice: The valve body is made of PVC plastic (UPVC, CPVC, PVDF), which is resistant to acids, alkalis, and corrosion, making it a "steel warrior" in industries such as chemical and water treatment.

Structural Ingenuity: The rubber or plastic diaphragm (like a thin film) moves up and down to control flow. The diaphragm completely isolates the medium inside the valve from the operating components, preventing leakage.

Connection Convenience: Both ends of the valve body feature flanges (circular discs with bolt holes), making it easy to bolt-fix to pipelines with good sealing performance.

Core Characteristics: Safety, Durability, Ease of Maintenance

Leakage Prevention: The diaphragm design prevents medium leakage, making it suitable for toxic or expensive liquids.

Corrosion Resistance: PVC material is resistant to acids, alkalis, and salt solutions, making it more durable than metal valves.

Easy Maintenance: The simple structure allows for easy replacement of the diaphragm when damaged without disassembling the entire valve.

Large Diameter: The flow path is unobstructed when fully open, making it suitable for viscous or impurity-containing liquids (such as sewage or slurry).

Typical Applications

Chemical Industry: Transporting corrosive chemicals.

Water Treatment: Controlling sewage, pure water, or chemical dosing processes.

Food/Pharmaceutical: Applications with high hygiene requirements (due to no dead corners and easy cleaning).

Environmental Equipment: Exhaust gas and wastewater treatment pipelines.