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Principles categories and maintenance methods of valve
Valve is a fluid delivery system control components, with cut-off, regulation, diversion, to prevent backflow, voltage regulator, shunt or overflow pressure relief functions.

Valves for fluid control systems, valves from the simplest cut-off valves to the most sophisticated automatic control systems, are available in a variety of sizes and sizes. Valves can be used to control air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. Valve according to the material is also divided into cast iron valves, cast steel valves, stainless steel valves (201,304,316, etc.), chrome molybdenum steel valves, chrome molybdenum vanadium steel valves, dual phase steel valves, plastic valves, . We should pay attention to in the daily maintenance: 1. Valves should be kept dry and ventilated room, both ends of the channel to be blocked. 2. Long-term storage of the valve should be regularly inspected, remove dirt, and anti-rust oil in the processing surface coated. 3.3, after installation, should be regularly checked, the main inspection items:

(1) sealing surface wear.

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

(3) the filler is out of date failure, if damaged should be replaced.

(4) valve repair assembly, should be sealed performance test.