What is a rising stem gate valve? What is a Non-rising stem gate valve?
The rising stem gate valve refers to the valve stem nut on the valve cover or bracket. When opening and closing the gate, the valve stem nut is rotated to achieve the lifting of the valve stem.
Non-rising stem gate valve means that the stem nut is in direct contact with the medium in the valve body, and it is realized by rotating the stem 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 centerline, that is, a gate valve with two sealing surfaces parallel to each other. Parallel gate valves are divided into double gate and single gate. There are diversion holes and no diversion holes.
A wedge gate valve is a gate valve in which the sealing surface is at a certain angle to the vertical centerline, that is, the two sealing surfaces are wedge-shaped. There are double gates, single gates and elastic gates in wedge gate valves.
For gate valves, what is double-sided forced sealing? What is single-sided forced sealing?
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 ensured by the axial force of the valve stem. When there is no medium When, 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 seal of the gate valve means that there is no seal between the gate plate at the medium inlet and the sealing surface of the valve seat. There is either no specific pressure at all or only a specific pressure smaller than the sealing specific pressure. The sealing performance between the gate plate and the sealing surface of the valve seat on the medium outlet side is forcibly ensured by the axial force of the valve stem and the medium pressure. When there is no medium, the specific pressure on the sealing surface shall not be less than the sealing specific pressure.
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