The stem valve is one of the stem nut on the bonnet or the bracket. When the shutter is opened and closed, the valve stem is lifted and lowered by the rotary stem nut.
The dark stem gate valve - the stem nut is in direct contact with the medium in the valve body, and the rotary valve stem is used to open and close the shutter.
What is a parallel gate valve? What is a wedge gate valve?
Parallel gate valve ------ sealing surface parallel to the vertical center line, that is, the gate valve with two sealing surfaces parallel to each other. There are double gates and single gates in the parallel gate valve. There are also diversion holes and no diversion holes.
The wedge gate valve has a sealing surface at an angle to the vertical center line, that is, two gate surfaces are wedge-shaped gate valves. In the wedge gate valve, there are double gates, single gates and elastic gates.
For a gate valve, what is a double-sided forced seal? What is a one-sided forced seal?
The double-sided forced sealing of the gate valve means that the sealing between the gate and the seat sealing surface is sealed at the inlet or outlet end of the medium, 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 faces shall not be less than the sum of the static pressure of the medium and the sealing force.
The one-side forced sealing of the gate valve means that there is no seal between the gate of the medium inlet end and the sealing surface of the valve seat, and there is no specific pressure at this time or only a specific pressure smaller than the specific pressure of the seal. The tightness between the gate and the seat sealing surface at the outlet of the medium 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 must not be less than the sealing specific pressure.we are gate valve china,you can know it.
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