The gate valve has the following advantages:
The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
Opening and closing is more labor-saving.
The flow direction of the medium is not limited, and it does not disturb the flow and does not reduce the pressure.
The utility model has the advantages of simple shape, short structure length, good manufacturing process and wide application range.
The disadvantages of the gate valve are as follows:
Erosion and abrasion are easily caused between the sealing surfaces, and maintenance is difficult.
The external dimensions are large, and a certain space is required for opening, and the opening and closing time is long.
The structure is more complicated.
According to the sealing surface configuration, the wedge type gate valve and the parallel gate type gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve Can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: open gate valve and dark gate valve.
The following matters should be noted for the installation and maintenance of the gate valve:
The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
The double gate valve should be installed vertically (ie the stem is in the vertical position and the handwheel is on the top).
The gate valve with the bypass valve should open the bypass valve before opening (to balance the differential pressure between the inlet and outlet and reduce the opening force).
The gate valve with transmission mechanism is installed according to the product manual.
If the valve is used frequently, it should be lubricated at least once a month.
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