Gate Valves

Guoda gate valve , also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. Guoda gate valves are designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss. Typical gate valves of Guoda should never be used for regulating flow, unless they are specifically designed for that purpose. On opening the 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 of Guoda disk tends to vibrate from the fluid flow. /ost 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.
The distinct feature of Guoda gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel.
Another type of bonnet construction in a gate valve of Guoda is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 900LB. The unique feature about the pressure seal bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases.


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