How to operate the valve correctly?
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January 05 09:07:59, 2023
The correct operation of the valve: For the valve, not only will be installed and maintained, but also will operate. First, the manual valve opening and closing: 1, manual valve is the most widely used valve, its hand wheel or handle, is designed according to ordinary manpower, taking into account the strength of the sealing surface and the necessary closing force. Therefore, you can not use the long lever or long hand to move plate. Some people are accustomed to using the wrench, should pay strict attention to, do not force too much, otherwise easy to damage the sealing surface, or plate broken hand wheel, handle. 2, opening and closing the valve, the force should be stable, can not impact. Some of the impact of high-pressure valve opening and closing of the various components have been considered this impact and general valve can not wait for Gang. 3, for the steam valve, before opening, should be preheated, and exclude condensate, open, it should be slow, so as to avoid the phenomenon of water hammer. 4, when the valve is fully open, the hand wheel should be reversed a little, so tight between the threads, so as not to loosen the damage. For the rod valve, remember to fully open and fully closed when the stem position, to avoid the impact of the fully open top dead center. And easy to check when the full closure is normal. If the valve to be off, or plugged between the larger spool seal, valve position will be closed when fully closed. 5, the first pipe, the internal dirt more, the valve can be micro-Kai, the use of high-speed flow of media, it washed away, and then gently shut down (can not quickly closed, fierce closed to prevent residual impurities sealing surface ), Open again, so repeated several times, rinse the dirt, then put into normal work. 6, often open the valve, the sealing surface may be stuck with dirt, shut down also use the above method to flush it clean, and then formally closed. 7, such as hand wheel, the handle is damaged or lost, should be immediately fitted, can not be replaced by the board wrench in order to avoid damage to the stem square, opening and closing ineffective, resulting in an accident in production. 8, some of the media, after the valve is closed, cooling, valve contraction, the operator should be closed again at an appropriate time, so that the sealing surface without fissure, or medium flow through the slit at high speed, it is easy to erosion Sealing surface. 9, operation, if found to be too strenuous operation, should analyze the reasons. If the packing is too tight, may be appropriate to relax, such as stem skew, should notify the staff to repair. Some valves, in the closed state, the closure of thermal expansion, resulting in open difficult; If you must open at this time, the valve cap can be loosened to a half circle to a circle, eliminating the stem stress, and then the plate hand wheel. Second, pay attention: 1,200 ℃ above the high temperature valve, due to the installation at room temperature, but after normal use, the temperature increases, the bolt heated expansion, the gap increases, it must be tightened again, called "heat tight", the operator To pay attention to this work, otherwise prone to leaks. 2, the weather is cold, long-term closure of water valve, water valve should be excluded. Steam valve stop steam, but also exclude condensate. The bottom of the valve is like a plug of thread, which can be opened for drainage. 3, non-metallic valves, some hard and brittle, and some low intensity, the operation, the opening and closing force can not be too large, in particular, can not make Meng Jin. Also pay attention to the provision of free objects bump. 4, when the new valve is used, the packing should not be pressed too tight, so as not to leak, so that the valve stem is pressed too much, to speed up the wear and tear, and opening and closing effort. This article Keywords: valve