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The production of Oil and Gas generates significant engineering challenges. Selecting the right Gate Valve for an application depends on many factors such as the nature of the product or the process fluid and whether it is liquid, gas, corrosive or dirty; the operating temperature and pressure; the working environment; the valve duty; and the shut off performance. There are a number of different types of Gate Valve and each has their own specific strengths.

Gate Valves, and in particular Through Conduit Slab and Expanding Gate Valves, provide superior sealing characteristics to any other type of valve configuration. As the demand for Subsea Processing increases, so in turn does the need for high integrity, zero leakage valves along with the demand for services to maintain their function and flow assurance. Not all of these services are sited on Subsea Production Systems, where the need for a weight-saving, space-saving and cost-saving solution is paramount.

The types of Gate Valve include valves with Through Conduit Slab, Through Conduit Expanding, Solid Wedge and Flexiwedge gates. Choosing an appropriate Gate Valve is dependent on the duty and the sealing characteristics demanded by the service; Through Conduit Slab Gates depend on the flowline pressure to effect a seal; whereas Expanding and Wedge Gate Valves are positive shut off valves that force the Gate onto the seats to effect a seal through increasing the torque and the thrust. In particular, the Flexiwedge is used for simple shut off duties where high temperatures are involved and to prevent the gate from jamming.

All designs are suitable for Surface and Subsea applications on both gas and liquids.

Through Conduit Gate Valves (TCGV) designed to API 6A, 17D, 6D and 6FA are custom manufactured by BEL Valves and supplied with Flanged, Butt Weld, Socket Weld, Hub Connectors, Compact Flange or other proprietary connections. Their pressure ratings are up to 16,500psi, temperature ranges from -46 to +175 Deg C and bore sizes from ½” to 42’’. All BEL Through Conduit Gate Valves have their sealing surfaces hard faced with Tungsten Carbide and can be configured with either rising or non-rising stems on Pneumatic or Hydraulic Actuators. The range of options underlines the engineering response from the integrated in-house capabilities at BEL Valves and the 6A and 17D Valves are available with cast or forged bodies and bonnets. All valves are available in Standard and Exotic Materials.

For Subsea applications they feature a Floating Piston which allows them to be overridden by an ROV even if the hydraulics are locked; a metal backseat in both open and closed positions and 316 stainless steel, as a minimum, in all wetted components; An Open/Close Indicator can be provided without compromising the valve size. A BEL Valves actuated TCGV can be installed