Slab Gate Valve manufacturer in USA 

SVR Global is a manufacturer of slab gate valves engineered for on/off flow control in high pressure pipeline and process applications across the United States. Our slab gate valves are built with a solid, single piece or parallel slab (gate) design that delivers full bore flow, low torque operation, and bi-directional sealing across a wide range of pressure classes and end connections.

What is a Slab Gate Valve?

Slab gate valve is one form of a gate valve characterized by a solid and flat gate which is referred to as a slab gate instead of a wedge-shaped gate used to block the flow. The slab gate valve blocks the flow by moving at right angles to the flow direction and seals on two parallel seating rings offering bidirectional sealing. Due to its design, the slab gate valve is recommended for use in pipelines and other applications that require a full bore valve.

Key Characteristics:

• Parallel seating surfaces for bi-directional sealing

• Full bore / through conduit design compatible with pipeline pigs and scrapers

• Low operating torque compared to wedge gate valves of equivalent size

• Metal seated or resilient seated trim options

• Suitable for both rising stem and non rising stem configurations

• Fire safe design per API 607 / API 6FA on request

Working Principle of a Slab Gate Valve:

1. Open Position - The slab retracts fully into the valve body, aligning its bore with the pipeline ID to allow unobstructed, full bore flow.

2. Closing Stroke - Turning the handwheel, gearbox, or actuator drives the stem, moving the slab perpendicular to the flow path between the two parallel seat rings.

3. Seating/Sealing - In an expanding slab design, the two halves of the gate wedge apart mechanically once fully closed, forcing each face tightly against its respective seat ring to achieve bi-directional, zero cavity shutoff. In a non-expanding design, the solid slab seats directly against both seat rings under line pressure and mechanical load.

4. Backseating - At full open, the stem backseats against the bonnet, isolating stem packing from line pressure and permitting maintenance without depressurizing the line.

5. Re-Opening - Reversing stem travel retracts the slab back into the body cavity, restoring full bore flow.

Technical Specifications:

Materials of Construction:

• Cast Carbon Steel (WCB, WCC)

• Forged Carbon Steel (A105, LF2)

• Low Temperature Carbon Steel (LCB, LCC)

• Stainless Steel (CF8, CF8M, CF3, CF3M)

• Duplex and Super Duplex Stainless Steel (F51, F53, F55)

• Alloy Steel (WC6, WC9, C5, C12)

• Trim materials - Stellite faced, hardened stainless steel, ENP-coated

Design Features and Engineering Benefits:

• Bi-directional, zero cavity sealing suitable for pigging lines

• Parallel slab construction minimizes friction and reduces actuation torque

• Anti static device between stem, gate, and body per fire safe design requirements

• Blowout proof stem design per API 6D

• Backseat arrangement for online stem packing maintenance

• Fugitive emission compliant packing arrangements (API 622 / ISO 15848 on request)

• Corrosion resistant trim options for sour service per NACE MR0175/ISO 15156

Quality Applications:

SVR Global's slab gate valves are engineered for demanding line conditions where full bore access, bi-directional shutoff, and long cycle isolation are needed:

• Oil and gas transmission pipelines

• Gas gathering and distribution networks

• Upstream wellhead and Christmas tree isolation

• Crude distillation units

• Petrochemical plant feedstock and product lines

• LNG terminal and regasification piping

• Offshore platform pipeline isolation

• Water injection and disposal lines in oilfield operations

• Slurry and mining pipeline isolation

• Power generation plant steam and feedwater isolation

• Chemical processing and storage terminal piping

Standards and Certifications:

• API 6D - Pipeline Valves

• API 600 - Steel Gate Valves for Refinery Service

• ASME B16.34 - Valves, Flanged, Threaded, and Welding End

• API 598 - Valve Inspection and Testing

• NACE MR0175 / ISO 15156 - Sour Service Materials

• API 607 / API 6FA - Fire Safe Testing

• PED / CE Marking on request for export shipments