By the pneumatic valve installation is not complete is higher than that of low into

By the pneumatic valve is in the fluid system, is used to control the direction of the fluid, pressure, flow of the device, is to make the piping and equipment within the medium ( Liquid, gas, powder) Flow or stop and can control the flow of the device. In the process of construction, by the pneumatic valve installation will directly affect the normal operation of the future or not.


by the pneumatic valve is designed for low into the above, the purpose is to make small flow resistance, save Labour when open the pneumatic valve. Pneumatic valve is closed at the same time, the pneumatic valve between the shell and pneumatic valve cover bedding and pneumatic valve stem packing around not force, not for a long time by the role of medium pressure and temperature can prolong the service life, reduce the risk of leakage. It also can be in the condition of pneumatic valve closed replace or add packing, easy to maintenance.


a lot of people think, by the pneumatic valve is higher than that of low into, actually otherwise. Generally by the pneumatic valve is higher than that of low into, however there are some special cases as pneumatic valve is higher in low out:


1, greater than 100 mm in diameter by high-pressure pneumatic valve


because of the large diameter pneumatic valve sealing performance is poor, in this way by the pneumatic valve in the closed state, the medium pressure over the pneumatic valve, pneumatic valve to increase the sealing.


2, the boiler exhaust, emptying by pneumatic valve


the boiler exhaust, emptying by pneumatic valve is used only in the process of boiler start-up sheung shui, open-close frequency is small, but often caused by untight seal working medium loss, therefore some power plant in order to improve the rigor such as pneumatic valve installation direction 'high in low'.





3, on the bypass pipe series of two by the pneumatic valve, the second stop pneumatic valve requirements 'high in low'


to ensure a maintenance cycle rigor, pneumatic valve opening and closing operation of the pneumatic valve requirements often furnish two series by the pneumatic valve. For the bypass system, the bypass of the furnish function are: (1) balance pressure before and after the main pneumatic valve, make convenient save Labour, reduce the main line of pneumatic valve wear and tear; (2) warm start-up process of small and medium-sized flow tube; (3) main feed line, feed water flow control to control the boiler pressure rise rate on boiler water pressure test. Pneumatic valve respectively according to the flow direction of medium bypass by a pneumatic valve, pneumatic valve and the second unit when the normal operation of a pneumatic valve and the second pneumatic valve is closed, both and direct contact with the media. To prevent secondary pneumatic valve pneumatic valve between the shell and pneumatic valve cover bedding and pneumatic valve stem packing around for a long time by medium and temperature, as well as in operation process can replace the pneumatic valve packing, secondary pneumatic valve requires the installation direction of 'high in low'.





4, electromagnetic speed to snuff out valve


electromagnetic speed to snuff out the function of dynamic valve is closed quickly, quickly cut off the fuel supply. Electromagnetic speed to snuff out valve structure and by the structure of the pneumatic valve is similar, if the electromagnetic speed to snuff out valve is working medium from the bottom, the upper flow, fuel role in electromagnetic speed to snuff out a force at the bottom of the pneumatic valve disc is very big, and electromagnetic speed to snuff out the valve weight is far less than it. Therefore, if the working medium entering speed from the bottom to snuff out valve, is because of the heavy hammer to produce torque less than the fuel pressure moment, when the dynamic valve movement speed to snuff out fuel can not be cut off, and therefore can not reach the expected goal. If working medium to hasten to snuff out the upper valve into the, because of the speed to snuff out moving valve once, the pneumatic valve pressure after falling rapidly, fuel role at the bottom of the pneumatic disc quickly reduced to zero, the force and the force of fuel effect on pneumatic disc and a heavy hammer, leverage force formed by the gravity of the


generally higher than that of large diameter and high pressure condition with low into close the pneumatic valve is difficult, if in the condition of high pressure large diameter with low into the higher, pneumatic valve stem water pressure easy to bending deformation for a long time, influence the safety of the pneumatic valve and seal; Selects high into the lower words of pneumatic valve stem diameter can be smaller, for manufacturers and users can also save some cost.


drainage engineering company as pneumatic valve factory has obvious arrow mark pneumatic valve, globe pneumatic valve when the flow direction of medium should be consistent with pneumatic valve body arrow.