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Daily maintenance of common valves
2017-12-27
"Valve leakage" is a fairly common valve problem. In fact, this problem is basically not paid attention to in daily maintenance. We only have to carry out daily maintenance of the valve with a scientific attitude, in order to achieve the desired effect and application purpose of the valve. Eliminate valve leakage at the source to reduce accidents caused by valve leakage. Therefore, we should do the following.
1. For long-term storage, the valve should be inspected regularly. The exposed surface should be kept clean and cleaned. When it is stored, the ball valve should be blocked at both ends and open. Gate valve, globe valve, check valve, both ends of the channel should be Blocked and closed, neatly stored in a ventilated and dry place indoors, no stacking or open storage.
2. Before installation, the pressure of the valve mark must be checked carefully, whether the diameter meets the requirements for use, the shortcomings caused by the transportation process are cleaned, and the dirt of the valve parts is cleaned.
3. When installing, the valve can be directly installed on the pipeline according to the connection mode. Under normal circumstances, it can be installed at any position of the pipeline, but it is easy to operate. Note that the flow direction of the shut-off valve should be upward from the longitudinal valve, and the lift check valve can only be installed horizontally.
4. When the ball valve, globe valve and gate valve are used, they are only fully open or fully closed. It is not allowed to adjust the flow to avoid the erosion of the sealing surface and accelerate the wear. Inverted seal in gate valve and upper thread stop valve
The device, the hand wheel is screwed to the upper position to tighten, to prevent the medium from leaking from the packing.
5. When the ball valve, globe valve and gate valve are opened and closed, the hand wheel should be applied. Do not use levers or other tools to avoid damage to the valve. The handwheel rotates clockwise to close, and vice versa.
6. The bolts of the packing gland should be evenly tightened and should not be pressed into a smashing state to avoid the movement of the valve stem or the leakage. 7. The valve should be kept clean during use. The transmission thread must be lubricated regularly. When the fault is found, it should be stopped immediately to find out the cause of the cleaning failure.
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