The gate valve is used to cut off or turn on the medium in the pipeline. Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc., and are applied more on oil pipelines. . Most of the metal gate valves are Dalian-type reduced diameter design. Compared with cast steel gate valves of the same diameter, the flow rate is slightly smaller, but the pressure and temperature range are higher than that of cast steel valves, and the sealing performance is much better than that of cast steel gate valves. Longer life, the direction of media flow is the same as other gate valves.
The gate valve has the following advantages:
1. The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
2. Opening and closing is more labor-saving.
3. The flow direction of the medium is not limited, and it does not disturb the flow and does not reduce the pressure.
4. The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.
The disadvantages of the gate valve are as follows:
1. Erosion and scratches are easily caused between the sealing surfaces, and maintenance is difficult.
2. The external dimensions are large, and a certain space is required for opening, and the opening and closing time is long.
3. The structure is more complicated.
The following matters should be noted for the installation and maintenance of the gate valve:
1. Handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
2. The double gate valve should be installed vertically (ie the stem is in the vertical position and the handwheel is on the top).
3. 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).
4. The gate valve with transmission mechanism is installed according to the specifications of the product manual.
5. If the valve is used frequently, it should be lubricated at least once a month.
Concerned about surprises
Label: Advantages and disadvantages of gate valves
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