First of all we need to know what advantage gate valves, suitable for use in what condition, what occasion, also know the disadvantages to the gate, avoid what is not the right occasion, after we began to learn to gate valve selection principle. The advantages of the gate 1. Medium flow direction will not change gate belongs to the through type this feature also makes the valve flow resistance is small. 2. Gate valve sealing performance is better stop valve and, in the open and close the gate Industrial Valves compared with cut-off valve, requires less effort & throughout; 。 3. Gate valve has wide application range. In addition to steam, oil, and other media, gate valves can also be applied to granular solid or with medium viscosity, used as the air release valve or valve of the vacuum system. 4. Gate valve with double flow direction, so that they will not be restricted the flow of media, and make them suitable for pipe change the flow direction of medium and make it easy to install on the pipe. Gate valve fault 1. Gate valves are normally large size, and the opening and closing time usually is long. When a gate open, the door was rising to the upper part of the valve cavity, when the gate is closed, the door has completely fall into the bottom of the seat, the seat to make long stroke as well as the opening and closing time. 2. Gate valve sealing surface can be in the opening and closing process of the friction between the sealing surface and seat sealing surface, which may lead to bad sealing, shorten the service life and maintenance difficulty of gate valves. The gate valve performance comparison single wedge gate valve 1. The structure is simple flexible wedge gate valve gate valve. 2. Under the condition of high temperature, a single wedge type gate valve has a poor performance of the flexible seal gate valves and double gate valve. 3. Single wedge gate valve is suitable for high temperature easy coked medium. Flexible wedge gate valve 1. Flexible wedge gate valve type, especially the single wedge gate valve. And wedge gate Industrial Valves, elastic wedge gate Industrial Valves sealing performance good high temperature conditions is not stuck in the door in the heat. 2. Flexible wedge gate valve applicable to steam, heat the oil, gas medium, pipes and parts need to open and close frequently. 3. Flexible wedge gate valves can not use easy coked medium. Double ram gate 1. Double disc gate valves with good wedge gate valve seal performance, and good sealing performance can maintain, even in the tilt Angle of the surface of the seal will not accurately for the seats. 2. When sealing surface wear, you only need to change the metal gasket, and do not need to cover or seal surface. 3. Double ram valve applicable to steam, heat oil, gas medium, and that part of the pipeline, the need to frequently open and close. 4. Double disc gate valves can not use easy coked medium. Parallel slide gate valves 1. Parallel slide gate valves of the sealing performance is poor compared with other valves. 2. Parallel slide gate valves suitable for medium to low temperature and low pressure. 3. Processing and maintenance of parallel slide gate valve seat and valve sealing surface is much simpler, gate valves than others. Gate valve installation note 1. The valve cavity and seal surface should check whether there is a dust or sand. 2. All components of the gate valve connection should be closely, level off. 3. The packing of gate valve should be compact, so that not only the performance of the packing will ensure somewhat, but this flexibility will be more secure. 4. The size of the model and used to connect to the flow direction of medium should be to check in front of the gate. 5. Gate valve must be regularly maintenance, can not be collision and extrusion or seal gate valves performance will be affected.
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