1. Classified by purpose and use
(1) Classification of cast steel valves Cut-off valves: Cut-off valves, also known as closed-circuit valves, function to switch on or off the medium in the pipeline. Cut-off valves include gate valves, globe valves, plug valves, ball valves, butterfly valves, and diaphragm valves.
(2) Check valve: Check valve, also known as check valve or check valve, is used to prevent backflow of media in the pipeline. The bottom valve of the water pump suction is also a check valve.
(3) Safety valve: The function of the safety valve is to prevent the pressure of the medium in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.
(4) Regulating valve: The regulating valve includes a regulating valve, a throttle valve and a pressure reducing valve, and its function is to adjust parameters such as pressure and flow of the medium.
(5) Diverter valve: The diverter valve type includes various distribution valves and traps, etc., which function to distribute, separate or mix the medium in the pipeline.
(6) Exhaust valve: Exhaust valve is an indispensable auxiliary component in the pipeline system, widely used in boilers, air conditioners, oil and gas, water supply and drainage pipelines. It is often installed at the commanding heights or elbows to eliminate excess gas in the pipeline, improve the efficiency of the road use and reduce energy consumption.
2. Classified by nominal pressure
(1) Vacuum valve: refers to a valve whose working pressure is lower than the standard atmospheric pressure.
(2) Low pressure valve: refers to the valve with nominal pressure PN ≤1.6Mpa.
(3) Medium pressure valve: refers to the valve with nominal pressure PN of 2.5, 4.0, 6.4Mpa.
(4) High pressure valve: refers to the valve whose working pressure PN is 10~80Mpa.
(5) Ultra-high pressure valve: refers to the valve with nominal pressure PN≥100Mpa.
3. Classified by working temperature
(1) Ultra-low temperature valve: for valves with medium working temperature t<-100°C.
(2) Cryogenic valve: for valves with medium working temperature -100 °C ≤ t ≤ -40 °C.
(3) Normal temperature valve: used for valves with medium working temperature -40 °C ≤ t ≤ 120 °C.
(4) Medium temperature valve: for medium working temperature 120 ° C
(5) High temperature valve: for valves with medium working temperature t>450°C.
4. Classified by driving method
(1) An automatic valve is a valve that does not require external force to drive, but relies on the energy of the medium itself to actuate the valve. Such as safety valves, pressure reducing valves, traps, check valves, automatic regulating valves, etc.
(2) Power-driven valves: Power-driven valves can be driven by various power sources.
Electric valve: With an electric drive valve.
Pneumatic valve: A valve driven by compressed air.
Hydraulic valve: A valve that is driven by a liquid pressure such as oil.
In addition, there are combinations of the above several driving methods, such as gas-electric valves.
(3) Manual valve: The manual valve uses manpower to manipulate the valve action by means of the hand wheel, handle, lever and sprocket. When the valve opening and closing torque is large, the wheel or worm gear reducer can be arranged between the hand wheel and the valve stem. If necessary, you can also use the universal joint and the drive shaft for remote operation.
Window Blinds,Window Blinds Walmart,Window Blinds Lowes,Window Blinds Amazon
Plantation Shutter, Window Blinds Co., Ltd. , http://www.nbshutter.com