Valve introduction
Valve is the flow of fluid medium flow, flow, pressure, temperature and other mechanical devices, the valve is the basic components of the pipe system. Valve pipe fittings in technology as often as a separate category to discuss. Valve can be manually or hand wheel, handle or pedal operation, can also change the fluid medium pressure, temperature and flow changes by control. Valves can perform continuous or repetitive operation of these changes, such as the safety valve installed in the hot water system or steam boiler. In the more complex control system according to the external input (that is, the flow through the pipeline to change the setting point), the need to use the automatic control valve. Automatic control valve without manual operation according to its input and setup, so that the valve accurately control the requirements of the fluid medium. Valve according to the material is divided into cast iron valve, cast steel valves, stainless steel valves, chrome molybdenum steel valves, chromium molybdenum vanadium steel valve, dual phase steel valves, plastic valves, non-standard custom valve material.The following Qingdao filter production of small series to introduce you.
Definition
The definition of valve is a device for controlling the direction, pressure and flow of the fluid in the fluid system.. The valve is to make the piping and equipment within the medium (liquid, gas, powder) or stop the flow, and can control the flow of the device.
Valve fluid conveying pipeline system is a control unit, it is used to change the channel section and flow direction of medium, with a diversion, cut-off, regulation, throttle, check back, diversion or overflow relief pressure. For fluid control valves, valve from the simple to the very complex automatic control system used in a variety of valves, its many varieties and specifications, the nominal valve through size from large to small instrument valve diameter up to 10m of industrial pipeline valves. Valve can be used for various types of fluid, the control of water, steam, oil, gas, mud and corrosion medium, metals and radioactive liquid fluid flow, the working pressure of the valve can be from 1.3 by 10 MPa to 1000 MPa ultra high pressure and temperature from - 269 DEG C of the ultra low temperature to 1430 DEG C high temperature. The valve can be controlled by a variety of modes of transmission, such as manual, electric, hydraulic, pneumatic, worm gear, pneumatic solenoid, electromagnetic - hydraulic, electric - hydraulic, gas - liquid, spur gear, bevel gear drive, pressure, temperature, or other forms of sensor signals for use, according to the requirements of the scheduled action, or does not rely on the sensing signal and a simple open or closed valve to rely on drive or automatic mechanism to open and close parts for lifting, slip swing or rotary motion, thus changing the area of the channel size in order to achieve its control function.
Valve application
Valve in the industrial production, life in all walks of life have a very wide range of use, is the life water pipe, industrial fluid pipeline essential equipment. Small household plumbing, to the Three Gorges Dam, Qinshan nuclear power plant, even space of the Shenzhou series of spacecraft, the international space station have valve in the middle of the play in
Wash step
Parts of the valve must be processed by the following processes before assembling:
1, according to the processing requirements, some parts need to do polishing, the surface can not have machining burr, etc.;
2, all parts for the skim treatment;
3, after completion of degreasing pickling and passivation, cleaning agent without phosphorus;
4. Rinse with pure water after purification, and can not be left with the chemical residue, carbon steel parts omitted this step;
5, parts one by one by non-woven fabric to dry, can not be wired the hair retained on the surface of the parts, or with clean nitrogen dry;
6, with non-woven or precision filter paper stained with pure alcohol on one part and part of the wipe, until no dirty color.
Assembly requirements
Clean parts must be sealed for installation.. The installation process is as follows:
1, the installation of the workshop to ensure clean, or build a temporary clean area, such as new purchase color cloth or plastic film to prevent in the installation process of dust entering.
2, the assembly workers must wear clean cotton overalls, wearing a cotton cap, hair can not leak, wearing a clean shoes, wearing plastic gloves, degreasing and.
3, the assembly tool must be in the assembly before cleaning the fat, ensure clean.
