Difference Between Solid Wedge Flexible Wedge Gate Valve

Pressure binding sometimes in high temperature applications the flow medium such as water or steam is trapped in the valve bonnet area when the valve is closed for system shutdown.

Difference between solid wedge flexible wedge gate valve.

29 old right road ipswich ma 01938 usa t 1 978 744 5690 f 1 978 741 3626 www global weir comparison parallel slide gate valve vs. The flex wedge valve has a single piece optimized gate design to provide minimized seat leakage. Solid wedge gate valves are generally used in moderate to lower pressure temperature applications. Velan s proven pressure seal design.

The solid wedge gate valve functions well in any position it is placed in and can handle almost any kind of fluid. A valve with this type of wedge can be installed in each position and it is suitable for almost all liquids. Velan pressure seal flexible wedge gate valves are ideal for high pressure steam main steam isolation liquid feedwater isolation catalytic reformers hydrocrackers and other tough services. Weir valves controls usa inc.

Flexible wedge gate valves the velan flexible wedge with round geometry and stem low in the cavity was pioneered by velan in 1960. Chemicals oil gas power. The flexible wedge gate valve is less susceptible to thermal binding and seat leakage than the solid wedge. Flexible wedge gate valves flex wedge share.

It has a large flexibility index up to 0 035 or 0 89 mm within normal closing torques and allowable stresses to compensate for seat distortions caused by piping loads. Flexible wedge gate valve. The solid wedge gate valve is the simplest design. Split wedge or flexible wedge type gate valves are expected to perform better than solid wedge gate valves when thermal binding is a concern.

The flexible wedge gate valve is a singular disk whose perimeter has a cut around it in order to be able to fit better in the valve seats. The hollow wedge design is used only for small valves in low temperature applications. However it is more susceptible to thermal binding and seat leakage than the split wedge or double disc. The cut depends on the design of the valve seats and the flexible wedge gate.

Image velan is a global leader in valve supply check their website for more product offerings. Flexible wedge gate valves flex wedge. The solid wedge is a single piece solid construction and is practically for turbulent flow. Wedge gate valve our parallel slide gate valve design offers many advantages over double disc wedge gate valves in providing tight reliable shut off in water and steam service.