Weir Type Diaphragm Valve
Raised weir design for precise flow control and tight shut-off in chemical applications.
Technical Specifications
| Type | Weir (Raised) |
| Size Range | 1/2" to 12" (15 mm to 300 mm) |
| Body Materials | PVC, PVDF, Stainless Steel, Lined (PTFE, Rubber) |
| Diaphragm Material | PTFE, EPDM, NBR, Natural Rubber |
| Bonnet | Cast Iron, Stainless Steel, Plastic |
| End Connections | Flanged, Threaded, Union |
| Pressure Rating | PN10 / PN16 |
| Standards | BS 5156, ISO 5208 |
Applications
Chemical processing, pharmaceuticals, water treatment
About the Weir Type Diaphragm Valve
The weir type diaphragm valve is a bi-directional shut-off and throttling valve in which a flexible diaphragm - made of PTFE, EPDM, natural rubber, neoprene, or NBR - is pressed down onto a raised weir (saddle) in the valve body to close the flow path. The diaphragm is the only wetted moving part: there is no packing box, no stem-to-fluid contact, and no contamination path between the process fluid and the actuating mechanism. This zero-packing-emission design makes diaphragm valves the preferred choice for ultra-pure, sterile, corrosive, and toxic service.
The weir design - where the body incorporates a raised saddle that the diaphragm seats against - allows a shorter diaphragm stroke than a straight-through design, providing better throttling control and longer diaphragm life. The trade-off is that the weir presents some restriction to full-bore flow; for abrasive slurry or viscous media where solids can accumulate behind the weir, a straight-through (full-bore) diaphragm valve is preferred.
Vajra Industrial Solutions supplies weir-type diaphragm valves in sizes 1/2" to 12" in PVC, PVDF, polypropylene, PTFE-lined iron, Stainless Steel 316L, and Hastelloy C-276 body materials. Diaphragm materials are selected per fluid compatibility: PTFE for universal chemical resistance, EPDM for steam and hot water, EPDM/PTFE sandwich for ultra-pure pharmaceutical water, and natural rubber for vacuum service. Manual, pneumatic, and electric actuator options are available.
Where It's Used
Key industries and applications for the Weir Type Diaphragm Valve
Pharmaceutical and biotech
SS316L with PTFE/EPDM sandwich diaphragm and electropolished interior finish Ra ≤ 0.4 μm for WFI (water for injection), purified water, CIP cleaning circuits, and bioreactor media lines; 3-A certified designs available
Ultrapure semiconductor and water treatment
PVDF or PFA-lined diaphragm valves for ultrapure water (UPW), hydrofluoric acid, hydrogen peroxide, and sulfuric acid in semiconductor fab process lines; metal-free wetted parts
Chemical processing
PTFE-lined steel body weir diaphragm valves for concentrated acids (H₂SO₄, HCl, HNO₃), caustic soda, and chlorinated solvents where elastomer-lined alternatives are attacked
Food and beverage
EPDM diaphragm with FDA-compliant / USP Class VI materials for milk, juice, beer, and syrup lines; CIP/SIP-compatible designs with aseptic bonnets prevent microbial growth
Wastewater and water treatment
rubber-lined diaphragm valves for sludge, grit, and alum slurry service in municipal WTPs and WWTPs; packing-free design eliminates the main failure mode of conventional valves in dirty service
How to Choose the Right Weir Type Diaphragm Valve
Select weir diaphragm over straight-through for clean, low-viscosity fluids where throttling control is needed (weir gives better control). Select straight-through when the fluid carries solids that could accumulate behind the weir, or when truly full-bore flow is required. Choose PTFE diaphragm for broad chemical compatibility; EPDM for steam service; natural rubber for vacuum or abrasive-particle slurry. Specify surface finish (Ra, μm) for pharmaceutical/food applications - standard Ra ≤ 0.8 μm, electropolished Ra ≤ 0.4 μm available.
Popular Configurations
Most commonly ordered specifications for the Weir Type Diaphragm Valve
Frequently Asked Questions
About Weir Type Diaphragm Valve - ordering, specs, delivery & compliance
What standards does the Weir Type Diaphragm Valve comply with?+
Our Weir Type Diaphragm Valve complies with BS 5156, ISO 5208. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Weir Type Diaphragm Valve?+
The Weir Type Diaphragm Valve is available in PVC, PVDF, Stainless Steel, Lined (PTFE, Rubber). Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Weir Type Diaphragm Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Weir Type Diaphragm Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered diaphragm valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Weir Type Diaphragm Valve?+
The Weir Type Diaphragm Valve is available in pressure ratings of PN10 / PN16. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Weir Type Diaphragm Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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