Valve daily maintenance guide

Valves are not only widely used in various industries, but also in different environments. Some valves in bad working conditions are prone to problems. As valves are important equipment, especially for some large valves, it is quite troublesome to repair or replace them once problems occur. So daily maintenance and maintenance is particularly important.

Valve storage and daily inspection

1. The valve should be stored in a dry and ventilated room, and both ends of the path should be blocked.

2, long-term storage valve should be regularly checked, remove dirt, and coated with anti-rust oil on the processing surface.

3, after installation, should be checked regularly, the main inspection items:

(1) Sealing surface wear.

(2) the trapezoidal thread wear of stem and stem nut.

(3) Whether the filler is outdated and invalid, if damaged, it should be replaced in time.

(4) After valve repair and assembly, sealing performance test should be carried out.

Maintenance of valve grease injection

The professional maintenance of valves before and after welding production plays a vital role in the production and operation of valves. Correct and orderly and effective maintenance will protect valves, make them function normally and extend the service life of valves. Valve maintenance seems simple, but it is not. There are often overlooked aspects of work.

1. When valve is greased, the problem of the amount of grease is often ignored. After the grease gun is refueled, the operator selects the valve and grease connection mode to carry out grease injection. There are two situations: on the one hand, less fat injection is insufficient, and the sealing surface is accelerated by the lack of lubricant. On the other hand, excessive fat injection, resulting in waste. There is no accurate calculation of different valve sealing capacities based on valve type and category. The sealing capacity can be calculated by valve size and type, and then reasonable injection of appropriate grease.

2. valve grease, often ignore the pressure problem. During the operation of fat injection, the pressure of fat injection showed a regular peak and valley change. The pressure is too low, the sealing leakage or failure pressure is too high, the grease injection mouth is blocked, the grease in the sealing is hardened, or the sealing ring is locked with the valve ball and valve plate. Usually when the grease injection pressure is too low, the injected grease flows into the bottom of the valve chamber, which generally occurs in small gate valves. If the fat injection pressure is too high, on the one hand, check the fat injection nozzle and replace it if the blockage of the fat hole is identified; On the other hand, grease hardening, to use cleaning liquid, repeatedly soften the failure of the sealing grease, and injection of new grease replacement. In addition, sealing type and sealing material also affect the grease injection pressure, different sealing forms have different grease injection pressure, in general, the hard seal grease injection pressure is higher than the soft seal.

To do the above work, I believe that the service life of the valve is very helpful, but also can reduce a lot of unnecessary trouble.