For the cut-off valve, not only will be installed and maintained, but also will operate.
Closing valve, force should be smooth, not impact. Some of the high pressure cut-off valves of the impact are considered to be the same as the general cut-off valve.
When the cut-off valve is fully open, the handwheel should be reversed a little, so that the thread between tight, lest loosen damage.
Guan Luchu time, the internal dirt more, the cut-off valve can be opened, the use of high-speed flow of media, it is washed away, and then gently shut down (not close, closed, in case of residual impurities in the sealing surface), again open, so repeated many times, washed dirty things, and then put into normal work.
Often open the cut-off valve, dense cover may stick to dirty things, close to use the above method to wash it clean, and then formally shut down.
Such as handwheel, handle damage or loss, should be immediately aligned, not to use the hand-operated plate to replace, lest damage the valve STEM Quartet, open and open not spirit, so that in production accidents.
Some media, when the cut-off valve closes after cooling, so that the valve contraction, the operator should be at the appropriate time to shut down again, so that the sealing surface does not leave a fine seam, otherwise, the medium from the fine seam high-speed flow, it is easy to erode the sealing surface.
When the operation is found to be too laborious, the reason should be analysed. If the filler is too tight, can be appropriately relaxed, such as stem skew, should notify the personnel to repair. Some cut-off valves, in the shutdown state, the closure of the heated expansion, causing opening difficulties; If you must open at this time, you can screw the lid thread loose half-lap to a lap, eliminating the stem stress, then the board hands.