The process of operating the valve is also the process of inspecting and handling the valve. However, the following matters should be paid attention to when operating the valve.
①High temperature valve. When the temperature rises above 200°C, the bolts are heated and elongated, which is easy to make the valve seal loose. At this time, the bolts need to be “hot-tightened”, and it is not appropriate to perform the hot-tightening in the fully closed position of the valve, so as to avoid the valve stem from being dead and difficult to open later.
②In the season when the temperature is below 0℃, pay attention to opening the valve seat plug for the valves that stop steam and water to remove condensed water and accumulated water, so as to avoid freezing and cracking the valve. Pay attention to heat preservation for valves that cannot eliminate water accumulation and valves that work intermittently.
③ The packing gland should not be pressed too tightly, and the flexible operation of the valve stem should prevail (it is wrong to think that the tighter the packing gland is, the better, it will speed up the wear of the valve stem and increase the operating torque). Under the condition of no protective measures, the packing can not be replaced or added under pressure.
④During the operation, the abnormal phenomena found by listening, smelling, seeing, touching, etc. should be carefully analyzed for the reasons, and those that belong to their own solutions should be eliminated in time;
⑤ The operator should have a special log book or record book, and pay attention to record the operation of various valves, especially some important valves, high temperature and high pressure valves and special valves, including their transmission devices. They should be noted the failure, treatment, replacement parts, etc., these materials are important to the operator itself, repair personnel and the manufacturer. Establish a special log with clear responsibilities, which is beneficial to strengthen management.
Post time: Mar-15-2022