Straight-Through Diaphragm Valve
Full-bore design for slurry and viscous media with minimal flow restriction.
Technical Specifications
| Type | Straight-Through (Full Bore) |
| Size Range | 1" to 8" (25 mm to 200 mm) |
| Body Materials | PVC, PVDF, Stainless Steel, Rubber Lined |
| Diaphragm Material | PTFE, EPDM, Natural Rubber, Neoprene |
| End Connections | Flanged, Threaded |
| Pressure Rating | PN6 / PN10 |
| Standards | BS 5156 |
Applications
Slurry handling, abrasive fluids, mining, pulp & paper
About the Straight-Through Diaphragm Valve
The straight-through diaphragm valve (also called a full-bore diaphragm valve) has no raised weir inside the body - the flow path runs straight through from inlet to outlet without any obstruction in the open position. To close, the diaphragm is driven down by the compressor stem until it spans the full pipe bore and contacts the smooth floor of the body, blocking flow completely. Because the diaphragm must travel the full distance from the top of the bore to the bottom, the closing stroke is longer and the actuating force is higher than in a weir-type diaphragm valve. However, the elimination of the weir behind which solids accumulate makes the straight-through design essential for slurry, viscous, and fibrous fluid applications where a weir-type design would cause build-up behind the weir and eventual blockage.
The straight-through design also provides superior drainability - when the valve is fully open, the body interior is flush with the pipe bore, with no weir to trap liquid or solid material. This makes straight-through diaphragm valves ideal for applications where residual product must drain fully from the valve body: mining slurry lines, pulp stock, fruit juice concentrate, and other food-grade viscous products. Vajra Industrial Solutions supplies straight-through diaphragm valves in sizes 1" to 8" in PVC, PVDF, rubber-lined iron, and SS316 body materials with diaphragm options including PTFE, EPDM, Natural Rubber, and Neoprene to BS 5156.
Where It's Used
Key industries and applications for the Straight-Through Diaphragm Valve
Mining and mineral processing slurry
rubber-lined iron or SS316 straight-through diaphragm valves for tailings slurry, ore concentrate, and leach solution lines; natural rubber or EPDM diaphragm handles abrasive particle-laden slurry; zero-crevice design prevents solid build-up
Pulp and paper
rubber-lined or SS316 straight-through diaphragm valves for wood chip slurry, pulp stock, and fibre-laden process streams; full bore ensures fibres do not accumulate behind a weir and cause blockage during low-flow conditions
Food and beverage viscous products
SS316 straight-through diaphragm valves for tomato paste, jam, syrup concentrate, and similar high-viscosity food products; CIP-compatible with EPDM diaphragm; full-bore design allows complete draining and cleaning
Cement and concrete admixture
PVC or rubber-lined straight-through diaphragm valves for cement slurry, concrete admixture, and bentonite grout in construction and tunnel boring applications; low pressure PN6–PN10 suits gravity-fed mixing systems
Wastewater and sludge
rubber-lined iron straight-through diaphragm valves for raw sewage, primary sludge, and grit slurry in municipal wastewater treatment plants; full-bore design handles rag and fibrous material without entanglement on a weir
How to Choose the Right Straight-Through Diaphragm Valve
Select the straight-through diaphragm valve over the weir type when: (a) the fluid carries suspended solids, fibres, or high-viscosity particles that would accumulate behind a weir; (b) complete drainage of the valve body is required for CIP cleaning or batch changeover; (c) the fluid is a viscous paste or slurry where weir-type throttling is not required - the straight-through is used primarily for on/off isolation in these applications. For clean low-viscosity fluids requiring throttling control, the weir type is preferred for its better control characteristic and longer diaphragm life.
Popular Configurations
Most commonly ordered specifications for the Straight-Through Diaphragm Valve
Frequently Asked Questions
About Straight-Through Diaphragm Valve - ordering, specs, delivery & compliance
What standards does the Straight-Through Diaphragm Valve comply with?+
Our Straight-Through Diaphragm Valve complies with BS 5156. 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 Straight-Through Diaphragm Valve?+
The Straight-Through Diaphragm Valve is available in PVC, PVDF, Stainless Steel, Rubber Lined. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Straight-Through 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 Straight-Through 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 Straight-Through Diaphragm Valve?+
The Straight-Through Diaphragm Valve is available in pressure ratings of PN6 / PN10. 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 Straight-Through 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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