Stainless steel gate valve types, according to the sealing surface configuration can be divided into wedge type gate valve and parallel gate valve, wedge type gate valve can be divided into: single gate, double gate and elastic gate;Parallel gate valves can be divided into single gate and double gate type.According to the screw position of the valve stem, it can be divided into rising stem gate valve and dark stem gate valve.This type of valve should be installed horizontally in the pipeline.When the valve is opened, when the gate is raised at a height equal to 1:1 times the valve size, the flow path is completely clear, but this position is not monitored during operation.In actual use, the vertex of the stem is used as a sign, that is, the open position, as its full open position.In order to allow for temperature changes in the phenomenon of locking, usually open to the peak position, and then back 1/2-1 turn, as a full open valve position.Therefore, the full open position of the valve is determined by the position of the ram (i.e. stroke >).

In some gate valves, the stem nut is located on the gate plate, and the handwheel rotates to drive the stem to rotate, so that the gate plate is lifted. This valve is called rotary stem gate valve or dark stem gate valve.