The advantages of gate valves are as follows:
First, the flow resistance is small; the inner medium channel is straight-through, the medium flows in a straight line, and the flow resistance is small.
The external force required for opening and closing is small, and it is more labor-saving when opening and closing. Since the movement direction of the gate is perpendicular to the flow direction of the medium, compared with the shut-off valve, the movement direction of the gate is open.
The height is larger and the opening and closing time is longer. The opening and closing stroke of the water gate is relatively large, and the screw is used for lowering.
Gate valve water hammer is not easy to occur; this is because of the long closing time.
The flow direction of the medium is not restricted, the medium can flow in any direction, and the installation is convenient. The valve channel is symmetrical on both sides.
Sixth, when fully open, the corrosion of the working medium on the sealing surface is less than that of the stop valve.
The gate valve has simple shape, good casting technology, short structure length, good manufacturing technology, and wide application range.
The gate valve has the following disadvantages:
In the process of opening and closing, there is relative friction between the sealing surfaces of the gate valve, which is prone to scour and scratches, and it is difficult to maintain the hydraulic solenoid valve. The sealing surface is easy to wear, which affects the life. In the process of opening and closing, the two sealing surfaces of the gate and the valve seat rub against each other. Under the action of the medium pressure, friction and wear are prone to occur, which affects the sealing performance and shortens the service life.
The external dimensions and opening height are relatively large, and the installation space requirements are relatively large. The high-frequency solenoid valve needs a certain amount of opening space, and the opening and closing time is relatively long. The price of the sluice is relatively high. Since there are many contact sealing surfaces, the processing is more complicated, especially the sealing surface of the gate base is not easy to process, and there are many parts. Generally, gate valves have two sealing surfaces, which increases the difficulty of processing, grinding and maintenance.