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In a cold steam system if a solid gate fits tightly between the valve seat when the steam is heated and pipes elongate.
Gate valve solid wedge vs flexible wedge. Disks of a gate valve. 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. Elongation causes the seats to compress against the gate and clamp the valve shut. Because its design allows the gate to flex as the valve seat compresses it.
Ranging of the gate valves is usually made by the type of wedge used. Flexible wedge gate valves flex wedge share. Solid wedge is the most commonly used disk by its simplicity and strength. 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 flex wedge valve has a single piece optimized gate design to provide minimized seat leakage. Gate valves are available with a variety of disks. 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. Flexible wedge gate valves flex wedge.
The flexible wedge is a one piece solid disk with a cut around the perimeter. The most common were. Chemicals oil gas power. Weir valves controls usa inc.
These cuts vary in size shape and depth. This problem overcome by using a flexible wedge gate valve. 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. Gate valves are available with different disks or wedges.
A cast in recess or deeper and wider cut on wedge perimeter gives more flexibility but compromises the strength. Classification of gate valves is usually made by the type disk used. Solid wedge flexible wedge split wedge or parallel disk. A valve with this type of wedge can be installed in each position and it is suitable for almost.
A shallow narrow cut on wedge perimeter gives less flexibility but retains strength. Classification of gate valves.
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