Stainless steel gate valve is a stainless steel valve suitable for horizontal or vertical pipelines.
working principle
The gate plate of the stainless steel gate valve moves linearly with the valve stem, which is called a lifting rod gate valve. Usually there is a trapezoidal thread on the lift rod. Through the nut on the top of the valve and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into the operating thrust. The sealing surface can be sealed only by medium pressure, that is, relying on medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
Types of stainless steel gate valves
According to the sealing surface configuration, it can be divided into wedge gate type stainless steel gate valve and parallel gate type stainless steel gate valve.
(1) Wedge gate gate valve can be divided into: 1. Single gate stainless steel gate valve, 2. Double gate stainless steel gate valve, 3. Elastic gate stainless steel gate valve
(2) Parallel gate gate valves can be divided into: 1. Single gate stainless steel gate valve and double gate stainless steel gate valve.
According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and concealed stem gate valve.
Advantages and Disadvantages
Advantages of stainless steel gate valve
1. The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
2. Opening and closing requires less effort.
3. The flow direction of the medium is not restricted, and it does not disturb the flow or reduce the pressure.
4. Simple shape, short structural length, good manufacturing process, and wide application range.
Disadvantages of stainless steel gate valve
1. Erosion and scratches can easily occur between the sealing surfaces, making maintenance difficult.
2. The overall size is large, it requires a certain amount of space to open, and the opening and closing time is long.
3. The structure is complex.