Why through conduit gate valves, the operational benefits. Through conduit slab gates and through conduit expanding gate valves provide their own unique benefits. However, in common, they both have high gate to seat sealing forces, due to their large sealing area, making them a good choice for zero emission applications. The superior sealing forces also mean that gate valves are perfectly suited to high pressure applications, even in combination with high temperatures. Operation is either by hand wheel and gearbox, electrical, pneumatic or hydraulic actuation. The hydraulic fast closing mechanism also makes the gate valve ideal for quick acting safety applications like HIPPS. As with their subsea equivalent, the surface gate valve is has either a rotary stem or a rising stem. Although this choice tends to be customer and application specific, the benefits of each are as follows: rotary stem (inside screw) are a lower cost, lighter and more compact design; rising stem (outside screw) means the operating thread is not exposed to process fluid creating a greater choice of material.
Benefits of BEL Valves Through Conduit Gate Valve design. Our gate valve design is inherently fail safe making it ideally suited for critical on/off service applications. Delivering a full range from ½” to 56” bore sizes the BEL Valves’ surface gate valve provides reliable sealing for high pressure and high temperature applications; as well as tried and tested surface applications for lower pressures (we have in service gate valves still working for our customers that were installed in the 1980s). With pressure ratings ranging from ANSI class 150 up to 16,500 psi and temperature ratings up to 190 deg C we offer standardised solutions and bespoke designs for some of the harshest of operating environments; reliable, safe designs being the common thread. Our simple one piece slab gate valve, which is hard faced with tungsten carbide, delivers superior metal to metal sealing and is available in standard and exotic materials, dependent on the application. The split or expanding gate valve is a two piece construction and can be expanded in the closed and/or open positions. Our expanding gate valves deliver gas tight, zero leakage sealing simultaneously on both the up and downstream seats, independent of line pressure in the open position. The significant benefit is a double block solution with additional vents to provide a bleed – all within a single valve body.
Standard and Optional Features.