Gate valve like Stainless steel foot valve is a type of valve that is certainly widely used in pipelines. Its main role is always to connect and disconnect medium. It’s not suitable for governing the flow on the medium, but it really can judge the volume of flow in accordance with the height in the sanitary valve stem. Compared with other valves, gate valve includes a wider selection of applications for pressure, temperature and caliber.

According to several internal structure, gate valve might be divided into wedge single gate plate type, elastic gate plate type, double gate plate type and parallel gate plate type.

Recently, newer and more effective customers are not particularly aware in the characteristics of cast steel gate valves. Based on recent work practices, Weldon summarized advantages and disadvantages of cast steel gate valves. Hope it could possibly make more clearly through this post.

Cast steel gate valve, also known as "API cast steel gate valve", would work for ANSI Class 150 - 2500 LBs, working temperature < 600 °C under various working conditions of petroleum, chemical, thermal power plants like pipelines, cutting or connecting pipeline media.

Thermal binding occurs a valve is tightly turn off while the warm system is functioning. Later when the product is shut down and permitted to cool, thermal contraction with the valve seats move inward a lot more than the wedge shrinkage. This can bind the wedge and seats tight enough never to allow the wedge to unseat or move once the hand-wheel or even the valve actuator is activated to start the valve.

Parallel seated gate valves are the most suitable for applications having likelihood of thermal binding. Split-wedge or flexible-wedge type gate valves are anticipated to perform greater than solid-wedge gate valves when thermal binding is usually a concern.

Sometimes in high-temperature applications, the flow medium, including water or steam, is kept in the valve bonnet area if your valve is closed for system shutdown. The valves which do not permit this trapped liquid or perhaps the condensate to reenter the piping either upstream or downstream can suffer excessive pressures
within the bonnet cavity in the event the system returns to operating temperature. This built-up pressure inside bonnet cavity can stop the valve from opening and might cause damage to valve parts.