Fisher - Valve installation, maintenance, and operation

To extend the life of a Fisher valve, most of us pay attention to installation and maintenance, but operation is also important. For valves, it is necessary to be able not only to install and maintain, but also to operate. Dongguang valve pointed out: valve installation, maintenance, operation, no one is missing. The installation and maintenance of valves is already a common problem, and we will not repeat it here. Today, we will mainly learn about the correct operation of manual valves.

1. When the pipeline is first used, there are many internal dirt, the valve can be slightly opened, and the high-speed flow of the medium can be used to flush it away, and then gently close it (not fast closing, sharp closing, in order to prevent residual impurities from pinch the sealing surface), open it again, and repeat it many times, flush out the dirt, and then put it into normal work.

2. Normally open valves, there may be dirt sticking on the sealing surface, and it should be washed clean by the above method when closed, and then officially closed.

3. If the handwheel and handle are damaged or lost, they should be completed immediately, and cannot be replaced by a live wrench, so as not to damage the valve stem and turn it off, resulting in accidents in production.

4. Some medium, after the valve is closed, cooled, so that the valve shrinks, the operator should close it again at the appropriate time, so that the sealing surface does not leave a fine seam, otherwise, the medium flows through the fine slit at high speed, and it is easy to erode the sealing surface.

5. During operation, if it is found that the operation is too strenuous, the reason should be analyzed. If the packing is too tight, it can be properly relaxed, if the valve stem is crooked, the personnel should be notified to repair. Some valves, when closed, the closing parts are heated and expanded, resulting in difficulty in opening; If it must be opened at this point, the bonnet thread can be loosened half to one turn to relieve the stem stress, and then the brake can be moved.

6. The manual valve is a widely used valve, and its handwheel or handle is designed in accordance with ordinary manpower, considering the strength of the sealing surface and the necessary closing force. Therefore, it is not possible to use a long lever or a long wrench to move the board. Some people are accustomed to using wrenches, and should pay strict attention not to use too much force, otherwise it is easy to damage the sealing surface, or break the handwheel and handle.

7. When opening and closing the Dongguang valve, the force should be stable and not impactful. The components of some high-pressure valves for impact opening and closing have considered that this impact force cannot be compared with ordinary valves.

8. For the steam valve, before opening, it should be heated in advance, and the condensate should be excluded, and when opened, it should be as slow as possible to avoid water hammer.

9. When the valve is fully opened, the handwheel should be reversed a little to make the threads tighter to avoid loosening and damage. For open rod valves, remember the stem position when fully open and fully closed, and avoid hitting the upper dead center when fully open. It is also convenient to check whether it is normal when it is fully closed. If the valve shaft falls off, or if a large debris is embedded between the spool seals, the position of the valve stem will change when it is fully closed.

Not only that, Dongguang valve pointed out: the high-temperature valve above 200 °C, because it is at room temperature when installed, and after normal use, the temperature rises, the bolt expands by heat, and the gap increases, so it must be tightened again, called "hot tight", and the operator should pay attention to this work, otherwise it is easy to leak.

Fisher - Valve installation, maintenance, and operation

Fisher - Valve installation, maintenance, and operation

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