Classification of valve
Do you know the classification of the valve? Below Qingdao valve manufacturer of small series to introduce you.
1 Classification by function and Application
(1) the truncated valve: the truncated valve is also called a closed valve, whose function is to connect or cut off the medium in the pipeline. Cut off valve type including gate valve, globe valve, plug valve, ball valve, butterfly valve and diaphragm.
(2) the check valve: the check valve is also known as a check valve or a check valve, which is the function of preventing the backflow from the media in the pipeline. Pump water off the bottom valve check valve also belongs to class.
(3) safety valve: the role of the safety valve is to prevent the pipeline or device in the medium pressure exceed the value, so as to achieve the purpose of safety protection.
(4) the regulating valve: the valve type comprises a valve, a throttle valve and a valve for reducing the pressure, flow, etc..
(5) the diversion valve: the diversion valve type includes a variety of valve and drain valve, etc., its role is to allocate, separate or mixed in the pipeline medium.
(6) the exhaust valve: the exhaust valve is an essential auxiliary element in the piping system, widely used in boiler, air conditioning, oil gas, water supply and drainage pipeline. Often installed in the commanding height or elbow, etc., to remove excess gas pipeline, improve the use of pipe roads and reduce energy consumption.
2 by nominal pressure classification
(1) vacuum valve: a valve under a working pressure that is less than a standard atmospheric pressure.
(2): refers to the low pressure valve nominal pressure PN valve is less than 1.6Mpa.
(3) MV valve: the nominal pressure PN 2.5, 4, 6.4Mpa valve.
(4) the high-pressure valve: a valve referred to a valve that is called a pressure PN of 10 ~ 80Mpa.
(5) ultra high pressure valve: refers to the nominal pressure PN = 100Mpa valve.
3 by working temperature classification
(1): ultra-low temperature valve for medium temperature valve T<100 C.
(2): used for medium temperature valve operating temperature of 100 DEG C = t = 40 C valve.
(3): valve used for medium temperature of-40 DEG C = t = 120 DEG C valve.
(4) the medium temperature valve: used in the medium working temperature 120
(5) high temperature valve: valve for the medium operating temperature t>450.
4 by driving mode
(1) the automatic valve is a valve without the need of an external force, but by the energy of the medium itself.. Such as safety valve, valve, drain valve, check valve, automatic valve, etc..
(2) power - driven valve: power - driven valve can use a variety of power source to drive.
Valve
Electric valve: with power driven valve.
Pneumatic valve: with compressed air driven valve.
Hydraulic valve: with the oil and other liquid pressure driven valve.
There are also several combinations of drivers, such as gas - electric valve, etc..
(3) manual valve: manual valve with hand wheel, handle, lever, sprocket, operated by manpower valve operation. When the valve opening and closing torque is large, between the hand wheel and valve stem set this wheel or worm gear reducer. When necessary, it can also use the universal joint and the drive shaft for long-distance operation..
5 by nominal diameter classification
(1) the small diameter valve: nominal diameter DN = 40mm valve.
(2) in the valve diameter: nominal diameter DN of 50 ~ 300mm valve.
(3) chase valve: nominal valve DN of 350 ~ 1200mm valve.
(4) large diameter valve: nominal diameter DN = 1400mm valve.
6 by structure feature classification
(1) valve valve: closed pieces along the center of the seat to move;
(2) the plug valve: the closure member is a plunger or ball, rotating around the center of its own;
(3) the gate form: the closure member moves along the center of the vertical valve seat;
(4) the swing valve: the shaft rotates around the valve seat;
(5) the disc: the disc, rotating around the valve seat;
(6) the slide valve: the closure is sliding in the direction perpendicular to the passage.
7 by connection method classification
(1) the valve: the valve body has internal or external threads, connected with the pipe thread.
(2) the flange is connected with the valve: the valve body has a flange, and the pipe flange is connected.
(3) welding connection valve: valve with welding groove, welding and piping connections.
(4) clip connecting valve: valve body with clip, connecting with pipe clamp.
(5) the connecting valve is connected with the pipe by a card sleeve.
(6) clip connecting valve: the connecting form of the valve and the two pipe clamps directly through bolts.
