Introduce the sanitary valves

The difference between sanitary valves
Sanitary valves are only a general term, which is divided into ball valves, butterfly valves, check valves and other types.
1. The sealing surface of the ball valve is spherical
2, the sealing surface of the butterfly valve is a circular cylinder
3, check valve sealing surface is round plate type
valve
Definition of a valve:
The definition of "valve" is a device used to control the direction, pressure, and flow of fluid in a fluid system. A valve is a device that makes the medium (liquid, gas, powder) in the pipe and equipment flow or stop, and can control its flow.
According to the different role of the opening and closing valve, there are many classification methods of the valve, and the following are introduced here.
1, according to the role and use
(1) Check valve: Check valve, also known as check valve or check valve, its role is to prevent the backflow of the medium in the pipeline. The bottom valve of the water pump suction close also belongs to the class of check valve.
(2) Safety valve: The role of 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.
(3) Regulating valve: Regulating valve includes regulating valve, throttle valve and pressure reducing valve, its role is to adjust the pressure of the medium, flow and other parameters.
(4) diverter valve: The diverter valve category includes a variety of distributing valves and traps, etc., whose role is to distribute, separate or mix the medium in the pipeline.
2, according to nominal pressure classification
(1) Vacuum valve: refers to the valve whose working pressure is lower than the standard atmospheric pressure.
(2) Low pressure valve: refers to the nominal pressure PN ≤1.6Mpa valve.
(3) Medium pressure valve: refers to the nominal pressure PN of 2.5, 4.0, 6.4Mpa valve.
(4) High pressure valve: refers to the valve whose working pressure PN is 10 ~ 80Mpa.
(5) Ultra-high pressure valve: refers to the nominal pressure PN≥100Mpa valve.
3. Classified by working temperature
(1) Ultra-low temperature valve: for medium operating temperature t<-100℃ valve.
(2) Low temperature valve: for the medium operating temperature of -100℃≤t≤-40℃ valve.
(3) Normal temperature valve: for the medium operating temperature of -40℃≤t≤120℃ valve.
(4) Medium temperature valve: used for medium operating temperature of 120℃
(5) High temperature valve: for medium operating temperature t>450℃ valve.
4, according to the nominal diameter classification
(1) Small diameter valve: nominal diameter DN≤40mm valve.
(2) Medium diameter valve: nominal diameter DN of 50 ~ 300mm valve.
(3) Big diameter valve: nominal valve DN of 350 ~ 1200mm valve.
(4) Large diameter valve: nominal diameter DN≥1400mm valve.
5. Classification according to structural characteristics
(1) Closure door: the opening and closing parts (valve disc) are driven by the valve stem along the center line of the seat for lifting movement;
(2) Cock type: the opening and closing parts (gate valves) are driven by the valve stem along the center line perpendicular to the seat for lifting movement;
(3) Plug valve: the opening and closing part (cone plug or ball) rotates around its own center line;
(4) Swing valve: the opening and closing parts (valve disc) rotate around the axis outside the seat;
(5) Adjustment row: the opening and closing parts (disks) rotate around the fixed shaft in the seat;
(6) Slide valve line: the opening and closing parts slide in the direction perpendicular to the channel.
6. Classified by connection method
(1) Threaded valve: The valve body has internal or external threads and is connected with pipe threads.
(2) Flange connection valve: the valve body has a flange and is connected with the pipe flange.
(3) Welded connection valve: the valve body has a welded groove and is welded with the pipeline.
(4) Clamp connection valve: the valve body has a clamp and is connected with the pipe clamp.
(5) Sleeve connection valve: with the pipe using sleeve connection.
(6) Clamp connection valve: Use bolts to directly clamp the valve and two pipes together.
7. Classified by drive mode
(1) Automatic valve refers to the valve that does not require external force to drive, but relies on the energy of the medium itself to make the valve operate. Such as safety valves, pressure reducing valves, steam traps, check valves, automatic regulating valves, etc.
(2) Power drive valve: Power drive valve can be driven by a variety of power sources.
Electric valve: A valve driven by electricity.
Pneumatic valve: A valve driven by compressed air.
Hydraulic valve: A valve driven by liquid pressure such as oil.
In addition, there are a combination of the above several driving methods, such as gas-electric valves.
(3) Manual valve: Manual valve with the help of hand wheel, handle, lever, sprocket, by manpower to control the valve action. When the opening and closing torque of the valve is large, the wheel or worm gear reducer can be set between the hand wheel and the valve stem. If necessary, it can also use the universal joint and the drive shaft for remote operation.
In summary, there are many valve classification methods, but mainly according to the role it plays in the pipeline. General valves in industrial and civil engineering can be divided into 11 categories, namely gate valves, globe valves, plug valves, ball valves, control valves, diaphragm valves, check valves, throttle valves, safety valves, reducing valves and traps. Other special valves, such as valves for instruments, valves for hydraulic control piping systems, valves for various chemical machinery and equipment bodies, are not within the scope of this website (www.bungingdevice.com).