The rising stem gate valve means that the stem nut is on the bonnet or bracket. When opening and closing the gate, the stem nut is rotated to realize the lifting and lowering of the stem.
Non rising stem gate valve means that the stem nut is in direct contact with the medium in the valve body, and the valve stem is used to rotate the gate when opening and closing the gate.
What is a parallel gate valve? What is a wedge gate valve?
Parallel gate valve: The sealing surface is parallel to the vertical center line, that is, the gate valve with the two sealing surfaces parallel to each other. There are double gates and single gates in the parallel gate valve. There are diversion holes and no diversion holes.
Wedge gate valve: The sealing surface is at a certain angle to the vertical centerline, that is, a gate valve in which the two sealing surfaces are wedge-shaped. Wedge gate valve is divided into double gate, single gate and elastic gate.
For gate valves, what is a double-sided forced seal? What is a single-sided forced seal?
The double-sided forced sealing of the gate valve means that no matter at the inlet or outlet of the medium, the gate and the sealing surface of the valve seat are sealed, and the sealing is forcibly guaranteed by the axial force of the valve stem. When there is no medium, the positive pressure between the sealing surfaces shall not be less than the sum of the static pressure of the medium and the sealing force.
The single-sided forced sealing of the gate valve means that there is no sealing between the gate at the inlet end of the medium and the sealing surface of the valve seat, where there is either no specific pressure at all or only a specific pressure that is smaller than the sealing specific pressure. The tightness between the gate plate and the sealing surface of the valve seat on the side of the medium outlet is forcibly guaranteed by the axial force of the valve stem and the pressure of the medium. When there is no medium, the specific pressure on the sealing surface shall not be less than the sealing specific pressure.
To learn more about gate valves, please visit the official website of Bundor Valve or contact us directly.