For globe valves, not only installation and maintenance, but also operation are required.
When opening and closing the stop valve, the force should be stable and not impacted. Some parts of the high-pressure globe valve that are opened and closed by impact have taken into account that the impact force cannot be equal to that of a general globe valve.
When the stop valve is fully opened, the handwheel should be turned upside down a little to make the threads tight to avoid loosening and damage.
When the pipeline is first used, there is a lot of dirt inside, the stop valve can be slightly opened, and the high-speed flow of the medium can be used to wash it away, and then gently close (can not be closed quickly or violently, to prevent residual impurities from pinching the sealing surface) , turn it on again, repeat this many times, flush the dirt, and then put it into normal work.
Normally open globe valve, there may be dirt on the sealing surface, when it is closed, it should be washed clean by the above method, and then officially closed.
If the handwheel and handle are damaged or lost, they should be assembled immediately, and cannot be replaced with a flexible wrench, so as to avoid damage to the valve stem, ineffective opening and closing, and accidents in production.
Some media cool down after the shut-off valve is closed, so that the valve parts shrink. The operator should close it again at an appropriate time, so that there are no slits on the sealing surface. Otherwise, the medium flows through the slits at a high speed, and it is easy to erode the seal. noodle.
During operation, if it is found that the operation is too laborious, the reason should be analyzed. If the packing is too tight, it can be loosened appropriately. If the valve stem is skewed, the personnel should be notified for repair. For some globe valves, in the closed state, the closing part is heated and expanded, which makes it difficult to open; if it must be opened at this time, the bonnet thread can be loosened by half a turn to one turn to eliminate the stress of the valve stem, and then the hand wheel is turned.