What should we pay attention to when operating the globe valve?

For globe valves, not only installation and maintenance, but also operation.What should we pay attention to when operating the globe valve?

Open and close globe valves, the force should be smooth, no impact.Some parts of high pressure globe valves with impact opening and closing have been considered that the impact force is not equivalent to that of regular globe valves.

When the globe valve is fully open, the handwheel should be reversed a little to make the thread tight, to avoid loose damage.

At the beginning of the pipeline, there are many internal dirt, the cut-off valve can be slightly opened, using the high-speed flow of the medium, wash it away, and then gently closed (can not quickly close, fierce close, in order to prevent residual impurities injury sealing surface), open again, so repeat many times, wash clean dirt, then put into normal work.

Normally open the globe valve, the sealing surface may be stuck with dirty, closed also want to use the method above to wash it clean, and then formally closed.

If the handwheel, handle damage or loss, should be immediately complete, can not be replaced by adjustable plate hand, lest damage valve stem square, open and close not to work, so as to produce accidents.

Some media, after the closure of the cut-off valve cooling, so that the valve contraction, the operator should be in the appropriate time to close again, so that the sealing surface does not leave a seam, otherwise, the medium from the seam high-speed flow, it is easy to erosion sealing surface.

During operation, if it is found that the operation is too laborious, the reasons should be analyzed.If the packing is too tight, can be properly relaxed, such as the stem askew, should notify the repair personnel.Some globe valves, in the closed state, the closed part by thermal expansion, resulting in open difficulties;If it must be opened at this point, unscrew the bonnet thread from half to one turn to remove the stress on the stem and then plate the starting wheel.