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Diaphragm Valve

In chemical processing, pharmaceutical manufacturing, water treatment and industrial fluid systems, conventional valves often suffer from stem packing leakage, corrosion and clogging when handling aggressive acids, alkalis, viscous fluids and particle-laden media — causing environmental contamination, safety hazards and costly downtime. XITA plastic diaphragm valves are engineered to solve these problems: manufactured from PPH and PVDF with EPDM+PTFE composite diaphragms, the flexible diaphragm completely isolates the process media from the valve stem and actuator, delivering zero-leakage flow regulation and shutoff with excellent corrosion resistance, making them ideal for corrosive, high-viscosity and high-purity applications where metal and conventional valves fail.

As an experienced plastic diaphragm valve manufacturer, we offer a complete range of manual diaphragm valves in sizes from DN15 to DN100 (1/2″ to 4″), with welding connections, EPDM+PTFE diaphragms, and pressure ratings from PN10 to PN16 (1.0–1.6 MPa). PPH models offer thermal stability from -20°C to 110°C, while PVDF models provide pH 1–14 corrosion resistance for extreme chemical service. Pneumatic actuator mounting is available for automated control. All products conform to DIN, ANSI, JIS, GB and ISO standards, with SGS and CE certification.

Why Our Plastic Diaphragm Valves Perform Better

Zero Leakage via Diaphragm Isolation

The flexible EPDM+PTFE composite diaphragm completely separates the process media from the valve stem, bonnet and actuator — eliminating stem packing leakage entirely and ensuring zero external leakage even with aggressive or hazardous fluids. This hermetic isolation protects workers from chemical exposure, prevents environmental contamination, and makes our plastic diaphragm valves the safest choice for toxic, corrosive and high-purity media in chemical, pharmaceutical and semiconductor processing.

Ideal for Viscous & Particle-Laden Media

The straight-through, unobstructed flow path and weir-type body design minimize turbulence and allow smooth passage of viscous fluids, slurries and suspended particles that would clog or damage conventional globe or gate valves. With flow resistance 30% lower than metal diaphragm valves, our plastic diaphragm valves reduce pumping energy costs while maintaining reliable flow regulation — perfect for chemical dosing, sludge handling, food processing and wastewater treatment applications.

Corrosion Resistance & High Purity

Available in PPH and PVDF materials, our plastic diaphragm valves withstand continuous exposure to acids, alkalis, salts, oxidizers and chemical solutions across pH 1–14 that rapidly corrode cast iron and steel valves. PVDF models offer exceptional chemical resistance and zero media contamination with an inert, smooth-bore surface, making them suitable for semiconductor, pharmaceutical and ultra-high-purity chemical processing where metal valves would leach contaminants or fail quickly in corrosive service.

Easy Maintenance & Pneumatic Automation

The diaphragm is the only moving part in contact with the media, and it can be replaced quickly without removing the valve body from the pipeline — minimizing maintenance downtime and repair costs. Manual handwheel operation provides precise flow modulation, while pneumatic actuator mounting is available for automated on/off or modulating control. The simple, robust design with fewer moving parts ensures long service life and reliable operation in demanding industrial environments.

Why Choose XITA as Your Plastic Diaphragm Valve Manufacturer

With over 20 years focused exclusively on thermoplastic piping systems, XITA is a trusted plastic diaphragm valve manufacturer serving customers in chemical, pharmaceutical, water treatment, semiconductor and mining industries worldwide. Our 3,000 m² ISO9001-certified factory has an annual capacity of 8,000 tons, with in-house mold making, injection molding, assembly and pressure testing all under one roof.

20+ Years Specialized in Plastic Valves
ISO9001 Certified, SGS & CE Approved
8,000 Tons/Yr Capacity, On-Time Delivery
In-House R&D, OEM/ODM & Customization
DN15–DN100 Full Size Range, Export Worldwide

  • PPH Diaphragm Valve

    XITA, a local leader in diaphragm valve supplier, is known for its top-of-the-line PPH Diaphragm Valves crafted from 100% virgin PPH. These are specially designed for chemical, water treatment, and pharmaceutical industries with EPDM+PTFE diaphragms, 1.0-1.6MPa pressure rating, available in DN15-DN5...
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  • PVDF Diaphragm Valve

    PVDF Diaphragm Valve

    XITA has fabricated high-performance PVDF Diaphragm Valves manufactured from 100% virgin PVDF for extreme industrial conditions. These valves are designed for chemical engineering, water supply systems, and mining plants with pH 1-14 corrosion resistance and zero leakages, including PN10 pressure ra...
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