The opening and closing component of a soft sealed gate valve is the gate, and the direction of movement of the gate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50, and 2 ° 52 '' 'when the medium temperature is not high. Generally, gate valves are prone to leakage and rusting. Soft sealed gate valve (elastic seat sealed gate valve), the gate material is cast iron lined with rubber, overcoming the disadvantages of general gate valves such as poor sealing, elastic fatigue, and easy rusting.

Soft sealed gate valve is an updated product of traditional gate valve, which uses an elastic material gate plate and utilizes the micro deformation compensation effect generated by the elastic material to achieve good sealing effect. Soft sealed gate valves have significant advantages such as lightweight opening and closing, reliable sealing, good elastic memory, and long service life. The gate of the hard sealing surface gate valve is made of cast iron or stainless steel, with low opening and closing resistance and no flow obstruction, but the sealing performance is poor. The difference between soft sealed gate valves is the different form of the gate sealing surface.