The role of gate valve is to use the valve flap along the center of the vertical direction of the line to move to open or close the pipeline access. Gate valve opening and closing parts are the main flap and valve seat. Gate and fluid flow vertical, changing the valve flap and the relative position between the valve seat, can change the channel cross-sectional area size, thus changing the flow. In order to ensure close tight, valve and seat sealing surface grinding. Gate valve is characterized by complex structure, larger size, higher prices; open slow, no water hammer phenomenon, easy to adjust the flow; drawback is the sealing surface larger, easy to wear.
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