Non-Rising Stem Gate Valve – Resilient Seated, Ductile Iron / WCB, Waterworks Grade
Non-Rising Stem Resilient Seated Gate Valve (Non-Rising Stem Resilient Seated Gate Valve) is a special type of gate valve, whose main feature lies in the fact that the rotary movement of the valve stem and its drive threads are located in the valve cavity, and the stem itself does not rise and fall with the lifting of the gate. This design not only saves installation space, but also solves the problems of leakage and corrosion that may exist in traditional gate valves.
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Structure and features
Stem design: the valve stem for rotary motion, its drive thread in the valve cavity, not with the lift of the gate and lift, so it is called non-lifting stem type.
Resilient seat: the internal skeleton of the gate is usually ductile cast iron cast as a whole, and the internal and external surfaces are all covered with rubber, forming an elastic gate. When closing, the sealing surface will produce elastic deformation, so as to achieve a good sealing effect.
Soft seal structure: It consists of elastic gate and flat bottom valve seat (cast with valve body as a whole), and this seal structure can effectively prevent leakage.
Shaft seal design: filling seal ring on the valve cover (or valve body) to prevent leakage at the valve stem.
Technical specifications and materials
Range of specifications: Usually include a variety of specifications such as DN50 to DN1000 to meet the needs of different piping systems.
Material selection: Key components such as valve body and bonnet are often made of cast iron, ductile iron or stainless steel to ensure the strength and corrosion resistance of the valve. The gate and seat are made of elastic materials such as rubber or EPDM to achieve good sealing effect.
Operation mode: different operation modes such as manual, electric, hydraulic or pneumatic can be selected according to the needs.
