Slab Gate / Through-Conduit Gate Valve
Full-bore through-conduit design with solid slab gate for pigging operations and pipeline isolation.
Technical Specifications
| Type | Slab Gate (Through-Conduit) |
| Size Range | 2" to 48" (50 mm to 1200 mm) |
| Body Materials | Carbon Steel (WCB), Low-temp (LCC), Stainless Steel |
| Gate Material | Solid Slab Gate - SS316 / Inconel cladding |
| Seat Material | Floating self-energised seats, Injection sealant |
| End Connections | Flanged (RF, RTJ), Butt Weld |
| Pressure Rating | Class 150 / 300 / 600 / 900 / 1500 |
| Standards | API 6D,API 6FA (fire-safe),ASME B16.34 |
| Lead Time | Ex-stock Gujarat: Same day | Standard items: 2–4 weeks | Exotic alloys: 8–12 weeks |
Applications
Transmission pipelines, pigging, crude oil, natural gas
About the Slab Gate / Through-Conduit Gate Valve
The slab gate valve - also called a through-conduit gate valve - features a solid slab-shaped gate with a bore machined through its centre equal in diameter to the pipeline bore. When the valve is fully open, the slab gate retracts completely into the valve body above (or below) the flow path, and the bore through the gate aligns perfectly with the pipe bore - creating a completely unobstructed, smooth, full-bore conduit that allows pipeline inspection gauges (pigs) to pass through unimpeded. This piggable full-bore characteristic is the primary differentiator from conventional wedge gate valves and is mandatory for transmission pipelines that are periodically cleaned, inspected, and batched using pipeline pigs.
The seating mechanism uses spring-loaded floating seat rings that are energised by line pressure, pressing the seats against the slab gate faces. This upstream-pressure-assisted seating provides reliable shut-off at all pressure levels, including low pressure where a wedge gate might not seal reliably. An injection fitting is provided on each seat cavity for emergency sealant injection if seat integrity is compromised in service. Vajra Industrial Solutions supplies slab gate valves in sizes 2" to 48" to API 6D, with fire-safe designs to API 6FA, in WCB, LCC (for cold climates), and stainless steel body materials.
Where It's Used
Key industries and applications for the Slab Gate / Through-Conduit Gate Valve
Natural gas and crude oil transmission pipelines
API 6D full-bore slab gate valves at block valve stations, compressor station suction and discharge, and pipeline crossing isolations; through-conduit bore permits intelligent pig passage for pipeline integrity management
Offshore subsea and platform piping
large-diameter Class 600–1500 slab gate valves on FPSO inlet manifolds, subsea tree isolation, and export pipeline riser base; NACE MR0175 trim for sour crude; fire-safe API 6FA
LNG pipeline and terminal
LTCS LCC slab gate valves for cryogenic liquid lines at send-out stations; extended bonnet with PCTFE seats; designed per BS 6364 for reliable operation at -160°C
Gas processing plants
slab gate valves on slug catcher outlet manifolds, amine absorber inlet/outlet, and dehydration unit block valves; piggable to permit inspection of liquid-accumulation sections without line shutdown
Water transmission mains
large-bore PN16–PN25 slab gate valves on trunk main isolation; full-bore design maintains hydraulic head; resilient EPDM seat rings for bubble-tight shut-off on treated water
How to Choose the Right Slab Gate / Through-Conduit Gate Valve
Specify a slab gate valve wherever pipeline pigging is required (inspection pigging, cleaning pigging, or batching), or wherever a completely unobstructed full-bore opening is mandatory for flow metering accuracy. For non-pigged pipelines where cost is the primary driver, a conventional wedge gate valve is sufficient. Verify the gate travel clearance space (slab retracts fully into the body cavity) is accommodated in the valve pit or trench design - slab gate valves have a taller face-to-top dimension than wedge gates.
Popular Configurations
Most commonly ordered specifications for the Slab Gate / Through-Conduit Gate Valve
Frequently Asked Questions
About Slab Gate / Through-Conduit Gate Valve - ordering, specs, delivery & compliance
What standards does the Slab Gate / Through-Conduit Gate Valve comply with?+
Our Slab Gate / Through-Conduit Gate Valve complies with API 6D, API 6FA (fire-safe), ASME B16.34. 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 Slab Gate / Through-Conduit Gate Valve?+
The Slab Gate / Through-Conduit Gate Valve is available in Carbon Steel (WCB), Low-temp (LCC), Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Slab Gate / Through-Conduit Gate 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 Slab Gate / Through-Conduit Gate Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered gate 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 Slab Gate / Through-Conduit Gate Valve?+
The Slab Gate / Through-Conduit Gate Valve is available in pressure ratings of Class 150 / 300 / 600 / 900 / 1500. 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 Slab Gate / Through-Conduit Gate 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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