TWS Valve is a professional valve manufacturer. In the field of valves has been developed for more than 20 years. Today, TWS Valve would like to briefly introduce the classification of valves.
1. Classification by function and use
(1) globe valve: globe valve also known as closed valve, its function is to connect or cut the medium in the pipeline. Cut-off valve class includes gate valve, stop valve, rotary valve plug valve, ball valve, butterfly valve and diaphragm valve, etc.
(2) check valve: check valve, also known as one-check valve or check valve, its function is to prevent the medium in the pipeline backflow. The bottom valve of the pump pump also belongs to the check valve class.
(3) Safety valve: the role of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.
(4) regulating valve: regulating valve includes regulating valve, throttle valve and pressure reducing valve, its function is to adjust the pressure, flow and other parameters of the medium.
(5) shunt valve: shunt valve includes all kinds of distribution valves and valves, etc., its role is to distribute, separate or mix the medium in the pipeline.
(6) air release valve: the exhaust valve is an essential auxiliary component in the pipeline system, which is widely used in the boiler, air conditioning, oil and natural gas, water supply and drainage pipe. Often installed in the commanding point or elbow, etc., to eliminate excess gas in the pipeline, improve the efficiency of pipe road and reduce energy consumption.
2. Classification by nominal pressure
(1) Vacuum valve: refers to the valve whose working pressure is lower than the standard atmosphere pressure.
(2) Low-pressure valve: refers to the valve with the nominal pressure PN 1.6 Mpa.
(3) Medium pressure valve: refers to the valve with a nominal pressure PN of 2.5, 4.0, 6.4Mpa.
(4) High pressure valve: refers to the valve weighing the pressure PN of 10 ~ 80 Mpa.
(5) Ultra-high pressure valve: refers to the valve with the nominal pressure PN 100 Mpa.
3. Classification by working temperature
(1) Ultra-low temperature valve: used for the medium operating temperature t <-100℃ valve.
(2) Low-temperature valve: used for the medium operating temperature-100℃ t-29℃ valve.
(3) Normal temperature valve: used for the medium operating temperature-29℃ <t <120℃ valve.
(4) Medium temperature valve: used for the medium operating temperature of 120℃ t 425℃ valve
(5) High temperature valve: for the valve with medium working temperature t> 450℃.
4. Classification by drive mode
(1) Automatic valve refers to the valve that does not need external force to drive, but relies on the energy of the medium itself to make the valve move. Such as safety valve, pressure reducing valve, drain valve, check valve, automatic regulating valve, etc.
(2) Power drive valve: The power drive valve can be driven by a variety of power sources.
(3) Electric valve: a valve driven by electric power.
Pneumatic valve: Valve driven by compressed air.
oil controlled valve : a valve driven by liquid pressure such as oil.
In addition, there are the combination of the above several driving modes, such as gas-electric valves.
(4) Manual valve: manual valve with the help of hand wheel, handle, lever, sprocket, to by the valve action. When the valve opening moment is large, this wheel and worm wheel reducer can be set between the hand wheel and the valve stem. If necessary, you can also use the universal joint and drive shaft for long-distance operation.
5. Classification according to the nominal diameter
(1) Small diameter valve: a valve with a nominal diameter of DN 40mm.
(2)Medial diameter valve: the valve with a nominal diameter DN of 50~300mm.valve
(3) Large diameter valve: the nominal valve DN is 350~1200mm valve.
(4) Very large diameter valve: a valve with a nominal diameter of DN 1400mm.
6. Classification by structural features
(1) Block valve: the closing part moves along the center of the valve seat;
(2) stopcock: the closing part is a plunger or ball, rotating around the center line of itself;
(3) Gate shape: the closing part moves along the center of the vertical valve seat;
(4) The opening valve: the closing part rotates around the axis outside the valve seat;
(5) Butterfly valve: the disc of the closed piece, rotating around the axis in the valve seat;
7. Classification by connection method
(1) Threaded connection valve: the valve body has internal thread or external thread, and is connected with the pipe thread.
(2) Flange connection valve: the valve body with a flange, connected with the pipe flange.
(3) Welding connection valve: the valve body has a welding groove, and it is connected with the pipe welding.
(4) Wafer connection valve: the valve body has a clamp, connected with the pipe clamp.
(5) The sleeve connection valve: the pipe with the sleeve.
(6) pair the joint valve: use bolts to directly clamp the valve and the two pipe together.
8. Classification by valve body material
(1) Metal material valve: the valve body and other parts are made of metal materials. Such as cast iron valve, carbon steel valve, alloy steel valve, copper alloy valve, aluminum alloy valve, lead
Alloy valve, titanium alloy valve, moner alloy valve, etc.
(2) Non-metallic material valve: the valve body and other parts are made of non-metallic materials. Such as plastic valve, pottery valve, enamel valve, glass steel valve, etc.
(3) metal valve body lining valve: the valve body shape is metal, the main surface of contact with the medium are lining, such as lining valve, lining plastic valve, lining
Tao valve et al.
9. According to the switch direction classification
(1) Angle travel includes ball valve, butterfly valve, stopcock valve, etc
(2) Direct stroke includes gate valve, stop valve, corner seat valve, etc.
Post time: Sep-14-2023