GB gate valve

GB gate valve

GB gate valves are a kind of gate valves which conform to GB, an advanced standard Chinese standard. GB gate valves are reasonable structure, reliable sealing, good function and attractive appearance. Featured by low fluid resistance, little impact erosion on sealing surface, no change of medium flow direction, no disturbed flow, small pressure drop, lower closing torque and etc, GB gate valve is a commonly-used cutout gate valve. GB gate valve is applicable for a wide range of pressure and temperature, and widely used put through or cut off the medium in oil or steam pipeline in the industries of petroleum, chemical, thermal power plants and etc (Gate valves are not suitable for throttling purposes.). What’s more, GB gate valves are available with a number of wedge configurations (solid, flexible and split) to best meet the specific service conditions.

Because the GB gate valves is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid and the distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, GB gate valves are often used when a straight-line flow of fluid and minimum restric?tion is desired. The gate faces can form a wedge shape or they can be parallel. On opening the GB gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.