Valves are not only widely used in various industries, but also have different operating environments. Some valves that work in harsh environments 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 it is particularly important to do a good job in daily maintenance and upkeep.

Storage and daily inspection of valves

1. Valves should be stored indoors in a dry and ventilated area, and both ends of the passage should be blocked.

2. Valves that have been stored for a long time should undergo periodic inspection, remove dirt, and apply rust proof oil on the processing surface.

3. After installation, regular inspections should be carried out, with the main inspection items being:

(1) The wear condition of the sealing surface,

(2) The wear of trapezoidal threads on the valve stem and valve stem nut,

(3) Whether the filling material is outdated or ineffective, and if it is damaged, it should be replaced in a timely manner,

(4) After valve maintenance and assembly, a sealing performance test should be conducted.

Maintenance work during valve grease injection

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

1、 When injecting grease into valves, the issue of the amount of grease injected is often overlooked. After refueling the grease gun, the operator selects the valve and grease connection method before proceeding with the grease injection operation. There are two situations: on the one hand, the amount of grease injected is insufficient, and the sealing surface wears faster due to the lack of lubricant. On the other hand, excessive fat injection leads to waste. There is no precise calculation of the sealing capacity of different valves based on their type and category. The sealing capacity can be calculated based on the valve size and type, and then an appropriate amount of lubricating grease can be injected reasonably.

2、 When injecting grease into valves, pressure issues are often overlooked. During the liposuction operation, the liposuction pressure exhibits regular peaks and valleys. Low pressure, seal leakage or failure. High pressure may cause blockage of the grease injection port, hardening of the grease inside the seal, or locking of the sealing ring with the valve ball or valve plate. When the grease injection pressure is usually too low, the injected lubricating grease tends to flow into the bottom of the valve chamber, usually occurring in small gate valves. If the injection pressure is too high, on the one hand, check the injection nozzle, and if the grease hole is blocked, determine the situation and replace it; On the other hand, lipid hardening requires the use of cleaning solution to repeatedly soften failed sealing grease and inject new lubricating grease for replacement. In addition, the sealing model and sealing material also affect the grease injection pressure. Different sealing forms have different grease injection pressures. Generally, the grease injection pressure of hard seals is higher than that of soft seals. Doing these works well is believed to be helpful in extending the service life of valves and reducing many unnecessary troubles.