In our daily life, there are always a variety of valves. Valves often appear in our lives. Valves can control water, heating, steam, various chemicals. Can adjust the size of various media. Valve comparison has a very important role. But I found that everyone knows nothing about the classification of valves. The name of the valve only know that there is one, that is, the valve, next, I will introduce you to the classification of the valve. Come along and follow the pace of the editor to see a complete list of classification of valves.
A complete list of valves
1.? According to the role and use of classification
(1)? Cut-off valve: cut-off valve, also known as closed-circuit valve, its role is to connect or cut off the medium in the pipeline. Cut-off valve category includes gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragms.
(2)? Check valve: check valve, also known as one-way valve or backstop valve, its role is to prevent the backflow of media in the pipeline. Pump suction off the bottom valve also belongs to the check valve category.
(3)? Safety valve: the role of the safety valve class is to prevent the pipeline or device in the medium pressure exceeds the specified value, so as to achieve the purpose of safety protection.
(4)? Regulating valve: regulating valves include regulating valves, throttle valves and pressure reducing valves, the role of which is to regulate the medium pressure, flow and other parameters.
(5)? Diverter valve: diverter valve category includes a variety of distribution valves and traps, etc., its role is to distribute, separate or mix the medium in the pipeline.
2. According to the nominal pressure classification
(1)? Vacuum valve: refers to the working pressure is lower than the standard atmospheric pressure of the valve.
(2)? Low-pressure valve: refers to valves with nominal pressure PN?≤1.6Mpa?
(3)? Medium pressure valve: refers to valves with nominal pressure PN?2.5, 4.0, 6.4Mpa.
(4)? High-pressure valve: refers to valves with a nominal pressure PN?of 10 to 80Mpa.
(5)? Ultra-high pressure valve: refers to the nominal pressure PN ≥ 100Mpa valve.
3.? Classification by operating temperature
(1)? Ultra-low temperature valves: valves for media operating temperature ?t<-100 ℃.
(2)? Cryogenic valve: for media operating temperature -100 ℃ ≤ t ≤ -40 ℃ valve.
(3)? Normal temperature valve: for media operating temperature -40 ℃ ≤ t ≤ 120 ℃ valve.
(4)? Medium temperature valve: for media operating temperature of 120 ℃
(5)? High-temperature valve: for media operating temperature t>450 ℃ valve.
4.? Classification according to the driving mode
(1)? Automatic valve is a valve that does not require external drive, but rely on the medium's own energy to make the valve action. Such as safety valves, pressure reducing valves, traps, check valves, automatic adjustment valves.
(2)? Power-driven valves: power-driven valves can be driven using a variety of power sources.
Electric valve: valves driven with the help of electricity.
Pneumatic valves: valves driven with the help of compressed air.
Pneumatic valves: valves driven with the help of liquid pressure such as oil.
In addition, there are combinations of the above drive methods, such as gas-electric valves.
(3)? Manual valves: manual valves with the help of handwheels, handles, levers, sprockets, by human power to manipulate the valve action. When the valve opening and closing torque is large, this wheel or worm gear reducer can be set between the handwheel and valve stem. If necessary, you can also use universal joints and drive shafts for remote operation.
5.? According to the nominal diameter classification
(1) small diameter valve: nominal diameter DN ≤ 40mm valve.
(2) medium through diameter valve: nominal diameter DN 50-300mm valve.
(3) large diameter valve: nominal valve DN 350 ~ 1200mm valve.
(4) very large diameter valve: nominal diameter DN ≥ 1400mm valve.
6.? Classification by structural features
(1) cut-off valve: opening and closing member (valve flap) driven by the valve stem along the center line of the valve seat for lifting movement;
(2) plug valves: opening and closing member (gate) driven by the valve stem along the perpendicular to the center line of the valve seat for lifting movement;
(3) plug valves: opening and closing member (cone plug or ball)? Rotate around its own centerline;
(4) rotary valve: opening and closing parts (valve)? Rotate around the axis outside the seat;
(5)Butterfly valve: opening and closing parts (disc)? rotates around a fixed axis inside the seat;
(6)Slide valve: the opening and closing parts slide in the direction perpendicular to the passage.
The above is a small introduction to the classification of the valve of the book, to here comes to an end. I believe that after reading the summary of the classification of valves, you must have a certain understanding of the classification of valves. Valve is a mechanical device to control the flow of liquid, the market on the variety of valves, I would like to suggest that everyone here is, in the purchase of valves, be sure to brighten your eyes, do not easily believe that unscrupulous businessman's rhetoric, recognizing the brand, recognizing the quality and then purchase. A small summary can help you.