stop valve is used in the fluid system to control the direction of the fluid, pressure and flow of the device. It is a kind of allowing pipes and equipment in the medium ( Liquid, gas, powder) Flow or stop and control the velocity of the device. In the process of construction, cut-off valve installation method will directly affect the normal operation of the future. Globe valve is designed for low in and out, the purpose is to make small flow resistance, and save the workload when open the valve. At the same time, when the valve is closed, the shell and the cover between the washer and around the valve stem packing is not force, long-term exposure to the medium pressure and temperature can prolong service life. Life and reduce the probability of leakage. In addition, the valve can replace or add valve shut down for maintenance. Many people think that cut-off valve is low in and out, but that is not the case. In normal circumstances, the cut-off Industrial Valves in and out of the low, but there are some special circumstances cut-off valve height: 1. High pressure cut-off valve, greater than 100 mm in diameter because of the large diameter valve sealing performance is poor, cut-off valve shut down in this way, medium pressure effect to increase the valve sealing on the disc. 2. The boiler exhaust emission and exhaust valve and exhaust valve boiler only used in boiler start-up process. The frequency of the opening and closing is very small, but because of poor sealing, working fluid is often lost. For this reason, some power plants must install the valve in order to improve the sealing. 'High in low. '3. On the by-pass pipe series two cut-off valve. The second cut-off valve need to 'high and low into'. In order to ensure the valve's sealing during the overhaul period, often open and close the valve need two series of globe valves. For bypass system, bypass the installation of the function is: 1, the balance before and after the main valve pressure, make open convenient save Labour, reduce wear main valve; 2 start the small flow rate in the process of heating tube; 3 is the main water supply pipe boiler water pressure test by controlling to control the charging speed of boiler feed water flow. According to the flow direction of the medium of the bypass valve is the main valve and auxiliary valve respectively. When the normal operation of the equipment, the main valve and auxiliary valve closed, both direct contact with the media. In order to prevent between the body and the secondary valve cover gasket and valve stem packing around for a long time because of the influence of medium and temperature, the valve packing can change during the process of operation, the secondary valve installation direction for 'high'. 4, electromagnetic valve electromagnetic fast disconnection valve function is fast cutting and quickly cut off fuel supplies. Electromagnetic quick disconnect valve structure is similar to the structure of the valve. If electromagnetic quick disconnect valve is also entered in the working medium from the lower and upper flow, the role in the electromagnetic force rapid disconnection valve lower fuel is very big, and weight for electromagnetic quick disconnect valve is far less than that. Therefore, if the working medium entering a quick disconnect from the lower valve, is produced by the weight of the torque is less than the torque generated by the fuel pressure, and when is quick disconnect valve actuating fuel can not be cut off, so failed to achieve their purpose. If the working fluid entering from the top of the quick disconnect valve, due to the role of the quick disconnect valve, the valve at the back of the pressure to reduce rapidly, and the reaction between the fuel role at the bottom of the disc quickly reduce to zero, and fuel power and weight function on the disc, produced by the lever of the gravity force, usually in large diameter and high pressure is difficult to close with low entry and high pressure valves. If using low entrance under high pressure large diameter and high entrance, the valve stem is easy to for a long time under water pressure deformation and bending, affect the safety of the valve and seal; If the level is low, the diameter of the stem can be very small, it will save the cost of the manufacturer and user.

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