Valve installation requirements, classification and uses
The valves are controlled fluid delivery system components, with the cut-off, regulation, diversion, to prevent reflux, regulation, diversion or overflow relief functions.
Valves for fluid control systems, from the most simple shut-off valve to a variety of highly complex automatic control valves used in the system, which is quite a range of varieties and specifications. The valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. Valve is also divided into cast iron valves, cast steel valves, stainless steel valves (201,304,316, etc.), chromium-molybdenum steel valve, chromium molybdenum vanadium steel valves, dual-phase steel valves, plastic valves, and other non-standard custom valve material according to the material .
According to the role and use classification
(1) Cut off: such as gate valves(Cast steel gate valve,Forged steel gate valve,Knif gate valve), globe valves, plug valves, ball valves（Three way ball valve,orbit ball valve）, butterfly valves, needle valves, diaphragm valves, etc. Truncated type valve, also known as closed-valve, globe valve, and its role is to connect or disconnect the line of media.
Check valve, check valve leakage, also known as one-way valve or check valve, the check valve is a kind of automatic valves, its role is to prevent the line of medium back, to prevent reverse pump and drive motor, and a container medium . Pump water off the end of the valve also belongs to check class.
Explosion-proof valves, valves and other accidents, the safety valve is to prevent the pipeline or device medium pressure exceeds a predetermined value, so as to achieve security purposes.
Regulating valves, throttle valves and pressure reducing valve, whose role is to regulate media pressure, flow and other parameters.
(2) Vacuum: such as vacuum valve, vacuum flapper valve, filling the vacuum valve, pneumatic vacuum valve. Its role is in the vacuum system, to change the direction of air flow, adjust the size of the gas flow, or turn off the vacuum system components pipeline called vacuum valves.
(3) special purpose: such as pigging valve, vent valve, drain valve, exhaust valves, filters and the like. Exhaust valve is an essential auxiliary piping system components, widely used in boilers, air conditioning, oil and gas, water supply and drainage canal. Often installed in the commanding heights or elbow, etc., exclude excess gas pipeline, improve the efficiency of management of road use and reduce energy consumption.
Valves Assembly requirements
Clean the parts must be sealed in order for the installation. The installation process requires the following:
1, the installation workshop must ensure clean, or clean up temporary area, for example, the purchase of a new color of the cloth or plastic film, etc., to prevent dust entering during the installation process.
2, assembly workers must clean cotton wearing overalls, wearing a cotton cap, the hair does not leak, clean and wearing shoes, wearing plastic gloves, degreasing.
3, the assembly tools must be degreased before assembly cleaning to ensure