The main function of the valve is to isolate equipment and piping system, regulate flow, prevent backflow, regulate and discharge pressure, is the control component of the fluid piping system, the role is very important. Therefore, in the ordinary use of the process need to pay attention to valve maintenance and maintenance.
1. Daily Maintenance Work Of Valve
1.1 The valve storage environment should be noted, should be stored in a dry ventilation room, and block the passage at both ends.
1.2 The valve should be regular inspection, and the removal of dirt on its surface coated with anti-rust oil.
1.3 After the valve has been installed and applied, it shall be regularly overhauled to ensure its normal operation.
1.4 Should check whether the valve sealing surface wear, and according to the circumstances of repair or replacement.
1.5 Check the stem and stem nut trapezoidal thread wear, packing is out of date and invalidation, and make the necessary replacement.
1.6 Test the sealing performance of the valve to ensure its performance.
1.7 The valve should be in good working condition, flange and bracket bolts complete, thread intact, no loose phenomenon.
1.8 If the handwheel is missing, it should be completed in time and can not be replaced by a spanner.
1.9 Packing gland not allowed to skew or no pre-tight gap.
1.10 If the valve is used in a harsh environment, vulnerable to rain, snow, dust, sand and other contaminants, it should install a protective cover for the valve stem.
1.11 The ruler on the valve should be kept intact, accurate, clear, valve lead seal, cap.
1.12 Insulation jacket should be no depression, cracks.
1.13 Valves in operation, avoid banging on them or supporting heavy loads.
2. The Valve Fat Injection Maintenance Work
The professional maintenance of the valve before and after the welding operation plays a vital role in the service of the valve in production and operation. Proper and orderly maintenance will protect the valve function properly and prolong the service life of the valve. Valve maintenance may seem simple, but it’s not. There are often overlooked aspects of work.
2.1 The Valve Fat Injection, Pay Attention To The Amount Of Fat.
After the Grease Gun is oiled, the operator selects the valve and the grease injection connection mode to carry out the grease injection operation. There are two situations: on the one hand, less grease injection insufficient, sealing surface because of the lack of lubricants and accelerated wear. On the other hand, excessive fat injection, resulting in waste. There is no accurate calculation of the sealing capacity of different valves according to the type of valve. The sealing capacity can be calculated according to the valve size and category, and the appropriate amount of grease can be injected reasonably.
2.2 The Valve Fat Injection, We Should Pay Attention To The Pressure Problem.
During the injection operation, the injection pressure changes in a regular manner. The pressure is too low, the seal leakage or the failure pressure is too high, the fat injection mouth is blocked, the seal inner fat kind hardens or the seal ring and the valve ball, the valve plate hugs dead. Usually grease injection pressure is too low, the injection of grease into the bottom of the valve cavity, usually occurs in a small gate valve. The injection pressure is too high, on the one hand, check the injection nozzle, such as grease hole blockage judge the situation for replacement; on the other hand, the use of cleaning fluid repeated softening of the failure of the sealing grease, and injection of new grease replacement. In addition, sealing type and sealing material, but also affect the injection pressure, different forms of sealing have different injection pressure, the general case of hard seal injection pressure to higher than soft seal.
Post time: Jul-28-2021