Daily maintenance work on clip hard seal butterfly valve
The clamped hard seal butterfly valve is a valve that realizes the opening or closing of the pipe by the rotation of the circular disc (sealing member) with the valve shaft. It is mainly used as a shut-off valve, and can also be designed to have the functions of cutting and throttling adjustment. At present, the use of clip hard seal butterfly valves on low pressure large and medium diameter pipes is increasing. However, since the multi-layer soft and hard stack sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a front surface flushing on the sealing surface thereof, and the soft sealing band in the metal sheet interlayer is directly washed, which directly affects the sealing performance. Therefore, it is necessary to do the usual maintenance work on the clip hard seal butterfly valve.
Maintenance
1. The clamped hard seal butterfly valve should be kept clean during use. The drive thread must be lubricated regularly. When the fault is found, stop using it immediately and find out the cause to clear the fault.
2. The bolts of the packing gland should be evenly tightened and should not be pressed into a smashing state to prevent the bump from hindering the movement of the valve stem or causing leakage.
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 flap. The lift check valve can only be installed horizontally.
4. When the clamped hard seal butterfly valve is used, it is only fully open or fully closed, and it is not allowed to adjust the flow to avoid the erosion of the sealing surface and accelerate the wear. The gate valve and the upper thread stop valve have an inverted sealing device, and the hand wheel is screwed to the position on the Zui to prevent the medium from leaking from the packing.
5. Apply the handwheel when opening and closing the hard seal butterfly valve. Do not use levers or other tools to avoid damage to the valve. The handwheel rotates clockwise to close, and vice versa.
6. Before installation, the pressure of the valve mark must be checked carefully, whether the diameter meets the requirements for use, eliminate the defects caused by the transportation process, and eliminate the dirt of the valve parts.
7. For long-term storage, the valve should be inspected regularly. The exposed surface should be kept clean and the dirt should be removed. The ball valve should be blocked and open at the time of storage. The pneumatic butterfly valve should be blocked and closed at both ends. Store neatly in a ventilated and dry place indoors. Do not stack or store in the open air.
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