Turning the handwheel, through the advance and retreat of the thread of the handwheel and the valve stem, lifts or lowers the valve plate connected with the valve stem to achieve the function of opening and closing.
The advantages of rising stem gate valves are:
The fluid resistance is small, and the sealing surface is less eroded and eroded by the medium.
Opening and closing is more labor-saving.
The flow direction of the medium is not restricted, the flow is not disturbed, and the pressure is not reduced.
The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.
The disadvantages of rising stem gate valves are:
Erosion and scratches are easily caused between the sealing surfaces, and maintenance is difficult.
The external size is large, a certain space is required to open, and the opening and closing time is long.
The structure is more complicated.