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Valve It Is The Control Part Of Pipeline Fluid Conveying System

Ningbo Fenfa Valve Co.,Ltd | Updated: Oct 30, 2017

Valves are mechanical devices that control flow, flow, pressure, and temperature of fluid medium, and valves are basic components in piping systems. Valve fittings are technically similar to pumps and are often discussed as a separate category. Valves can be operated manually or by Handwheel, handle or pedal, or by control to change the pressure, temperature, and flow of fluid medium. Valves can perform continuous or repetitive operations on these changes, such as safety valves installed in hot water systems or steam boilers.

Automatic valves are used in more complex control systems based on external inputs (i.e., adjusting the settings that flow through the pipeline). The automatic control valve does not need manual operation according to its input and the setting, causes the valve precisely controls the fluid medium the request. Valve According to the material is also divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual-phase steel valves, plastic valves, non-standard custom-made valve materials.

"Valve" is defined as a device in a fluid system to control the direction, pressure, and flow of a fluid. Valves are devices that allow the flow or cessation of the medium (liquid, gas, powder) in the piping and equipment and can control its flow.

Valve is a pipeline fluid transport system control components, it is used to change the channel section and medium flow direction, with diversion, cut-off, regulation, throttling, check back, shunt or overflow discharge and other functions. Valves for fluid control, from the simplest valve to a very complex automatic control system used in a variety of valves, its variety and specifications of a wide range, valve nominal diameter from very small instrument valve to reach the diameter of 10m industrial pipeline valve. Valves can be used to control water, steam, oil, gas, mud, a variety of corrosive media, liquid metal and radioactive fluids and other types of fluid flow, valve pressure can be from 1.3х10mpa to 1000MPa of ultra-high pressure, operating temperature from 269 ℃ to 1430 ℃ high temperature. Valve control can be used in a variety of transmission methods, such as manual, Electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic-hydraulic, electric-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc. can be in the action of pressure, temperature or other form of sensor signal, according to the predetermined requirements, Or do not rely on the sensor signal to carry out a simple opening or closing, the valve relies on the drive or automatic mechanism to make the headstock to lift, slip, swing or rotary movement, so as to change the size of its runner area to achieve its control function.

Valve Application

Valves in the industrial production, living in all walks of life have a very wide range of applications, is the life of water pipelines, industrial fluid piping essential equipment. Small to the family tap water pipeline, large to the Three Gorges Dam, Qinshan nuclear power plant, and even space of the Shenzhou series spacecraft, the International Space Station have valves in the middle play a vital role. Data show that in 1 Million-kilowatt of the nuclear power plant, the value of the valve accounted for 5% to 10% of the total investment in the nuclear power plant, the maintenance costs of the late valve accounted for 50% of the nuclear power plant, visible valve importance.

Cleaning steps

The components of the valve must be processed by the following process before assembling:

1, according to the processing requirements, some parts and components need to do polishing treatment, the surface can not have processing burr;

2, all parts for degreasing treatment;

3, after degreasing finish pickling passivation, cleaning agent does not contain phosphorus;

4, after pickling and purification with purified water rinse clean, can not have residue, carbon steel parts omit this step;

5, spare parts with Non-woven fabric to dry, can not be wired, such as the surface of the retained parts, or with clean nitrogen to blow dry;

6, with non-woven cloth or precision filter paper stained analysis of pure alcohol on one part to wipe, until there is no dirty color.

Ningbo Fenfa Valve Co.,Ltd