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The lower valve body cavity of the union-style plastic diaphragm valve is separated from the upper valve cover cavity, 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 external leakage of the medium.

Structure

It resembles a valve made of plastic (PVC), with threads or clips (unions) on both ends and a handwheel or handle in the middle. When the handwheel is turned, it presses the internal diaphragm, which acts like a rubber stopper to block or open the flow path.

Material: PVC is the material used—lightweight, corrosion-resistant, and affordable, making it suitable for handling water and chemical liquids.

Union-style: Refers to the valve having "live joints" (like screw threads) on both ends, allowing for quick disassembly and installation without cutting the pipes during maintenance.

Diaphragm valve: The key feature is the "diaphragm," a rubber/plastic membrane inside the valve that moves up and down like cling film to control opening and closing.

If you have any requirements, such as "I want this type of diaphragm valve!" or "I want to use it for this fluid!", please feel free to tell RETZ.

Main performance

Union-style 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.

Specifications: 1/2" - 4"

Applicable temperature: 0~100°C

Pressure: 10 bar (145 PSI)

Control: Manual, pneumatic, electric

Main performance

Union-style 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.

No clogging! The liquid only contacts the diaphragm and valve body, with no dead corners, making it suitable for slurries, chemical solutions, and other dirty fluids.

Leak-proof! The diaphragm separates the valve stem from the fluid, preventing the stem from rusting and ensuring no fluid leakage.

Corrosion-resistant! PVC itself is resistant to acids, alkalis, and saltwater, making it more cost-effective than metal valves.

Easy to repair! The union design allows the valve to be unscrewed for diaphragm replacement or cleaning without disturbing the pipeline.

Conclusion

An imported PVC union-style diaphragm valve is essentially "a valve made of plastic, capable of quick disassembly and assembly, and operated by a rubber membrane for switching." It is suitable for corrosive and dirty liquids, affordable, and easy to maintain!