Solenoid valve has closed cavity, in the different position of the open hole, each hole leads to different tubing, cavity valve is among, both sides are two electromagnets, which face the magnet coil electricity valve will be attracted to which side, by controlling the movement of the valve body blocked or leakage of different discharge of oil hole, and the oil hole is always open, hydraulic fluid will enter the different oil drain, and then through the oil pressure to push oil just the pistons, piston drives the piston rod, piston rod drive mechanism. Thus the mechanical motion is controlled by controlling the current of the electromagnet.
At home and abroad of the solenoid valve in principle can be divided into three categories (i.e., straight acting, direct acting and pilot operated in stages), and from a disc structure and material of the difference between the different and in principle is divided into six branches small class (diaphragm structure, step by step of moving heavy piece of membrane structure, the structure, the forerunner in straight moving piston structure, step by step piston structure, the forerunner of moving piston structure), according to the air route is divided into two 2, 2, 3, 4, 2 2 5.
Solenoid valve is divided into single electric control and double electric control, refers to the number of the electromagnetic coil, the single coil is called single electric control, double coil is called double electric control, two two through, two three is generally single electric control (single coil), two four through, two five can be single electric control (single coil), can also be double electric control (double coil).
A, according to the control of medium in the pipeline and solenoid valve can be divided into different kinds of working condition: fluid with electromagnetic valve, gas with gas solenoid valve solenoid valve, solenoid valve, steam, oil solenoid valve, fire special solenoid valve solenoid valve, solenoid valve, anti-corrosion, high temperature and electromagnetic valve, high pressure solenoid valve, without pressure differential electromagnetic valve, electromagnetic valve cryogenic (cryogenic solenoid valve), vacuum electromagnetic valve, etc.
Two, according to the different internal structure of the solenoid valve can be divided into pilot, direct action, compound, recoil, self-retaining, pulse, bistable, bidirectional and so on.
Three, according to the use of solenoid valve materials can be divided into: cast iron (gray cast iron, ductile iron), copper (cast copper, wrought copper), cast steel, all stainless steel body (304, 316), non-metallic materials (ABS, ptfe).
Iv. According to the pressure of pipeline intermediates, it can be divided into: vacuum type (-0.1~0Mpa), low pressure type (0~ 0.8mpa), medium pressure type (1.0~ 2.5mpa), high pressure type (4.0~ 6.4mpa), and ultra-high pressure type (10~21Mpa).
Five, according to the medium temperature can be divided into: normal temperature type (~), medium temperature type (~), high temperature type (~), ultra-high temperature type (~), low temperature type (~), ultra-low temperature type ().
Ac voltage: AC220V380V110V24V; Dc voltage: DC24V12V6V220V; The common voltage is AC220VDC24V, and the supply cycle of common voltage and special voltage is long.
Vii. According to the protection level of the solenoid valve, it can be divided into: explosion-proof type, waterproof type, outdoor type, etc.
Direct acting solenoid valve:
Principle: when energized, the electromagnetic coil produces electromagnetic force to lift the closure from the valve seat and open the valve; When the power, the electromagnetic force disappeared, the spring to the closure of the pressure on the seat, the valve closed.
Features: it can work normally in vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.
Distributed direct-acting solenoid valve:
Principle: it is a kind of principle combining direct action and pilot type, when there is no pressure difference between the inlet and outlet, after power on, the electromagnetic force directly lift the pilot small valve and the main valve closure piece upward in turn, the valve opens. When the starting pressure difference is reached at the inlet and outlet, after electrification, the electromagnetic force pilot small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber falls, so as to use the pressure difference to push the main valve upward; When power off, the pilot valve using spring force or medium pressure to promote the closure, moving down, so that the valve closed.
Features: it can operate in zero pressure difference or under vacuum and high pressure, but with large power, it must be installed horizontally.
Pilot solenoid valve:
Principle: when energized, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops rapidly, forming a high pressure difference around the closing part. The fluid pressure pushes the closing part upward, and the valve opens. When the power is cut off, the spring force will close the pilot hole, and the inlet pressure will quickly form a pressure difference of lower, higher and higher around the closing valve through the bypass hole chamber. The fluid pressure will push the closing part to move down and close the valve.
Both the 3-way magnet valve (usually with single-acting pneumatic actuators, two is two position control, on-off, tee, there are three channels ventilation in general a channel connected with gas source, the other two channel 1 connected to the inlet of the actuator, one connected to the actuator vent, the working principle of specific can consult single-acting actuator principle diagram.
Two five-way solenoid valve which is equipped with double-acting pneumatic actuators, two is two position control, on-off, there are five tunnel ventilation, 45 is one connected with gas source, two external and double-acting cylinder chamber in and out of the port connection, two with the internal chamber in and out of the port in succession, you may refer to the working principle of concrete working principle of the double-acting pneumatic actuators
In the air circuit (or liquid circuit), the two three-way solenoid valve has one air inlet (connected to the air source), one air outlet (provided to the air source of the target equipment), and one exhaust (generally installed with a muffler, if not afraid of noise can also be installed without . Two five-way solenoid valves have one inlet (connected to the inlet air source), one positive acting air outlet and one making air source (respectively provided to the target equipment as a positive acting air source), one positive acting air outlet and one making air outlet (equipped with muffler).
For small automatic control equipment, the trachea is generally selected 8~12mm industrial rubber trachea. In the electrical, two three-way solenoid valve generally single electric control (that is, a single coil), two five-way solenoid valve generally double electric control (that is, double coil). The coil voltage grade generally adopts DC24V, AC220V, etc. Two three-way solenoid valve is divided into normally closed type and normally open type, normally closed refers to the coil is not energized when the air circuit is broken, normally open refers to the coil is not energized when the air circuit is open. Normally closed two three solenoid valve action principle: to the coil power, the air circuit is connected, once the coil power, the air circuit will be disconnected, this is equivalent to the "point". Normally open type two - position three - way single electric solenoid valve action principle: to the coil power, the air circuit is disconnected, once the coil power, the air circuit will be connected, this is also the "point". Principle of action: energize the positive action coil, then the positive action air circuit is connected (positive action air hole has air), even after the positive action coil is cut off, the positive action air circuit is still connected, which will be maintained until the coil is energized. If the coil is energized, the air circuit is connected (the air hole is provided with air). Even if the coil is cut off, the air circuit is still connected, and it will be maintained until the positive coil is energized. This is the equivalent of self-locking. Based on the characteristics of two five-way double electric solenoid valve, in the design of electromechanical control circuit or the preparation of PLC program, can let the solenoid valve coil action 1~2 seconds on it, this can protect the solenoid valve coil is not easy to damage.
Solenoid valve in the liquid path system is used to achieve the liquid path on or off or change the direction of the liquid flow, it generally has a coil in the electromagnetic force to drive the sliding valve core, the valve core in different positions, the path of the solenoid valve is also different. There are several working positions of the spool, WeChat add car connect shenzhen service platform the solenoid valve is called a few solenoid valve: valve body on the interface, that is, the solenoid valve path number, there are a few through the intersection, the solenoid valve is called a few solenoid valve. Solenoid valve installation, generally all the interface should be connected, the so-called working position refers to the position of the spool. The spool is in position a when the coil is not energized and position b when the coil is energized. When the spool is in different positions, it can connect or close the interfaces.
Solenoid valve two refers to the solenoid valve spool has two different working positions (open, close). Solenoid valve through two, three refers to the solenoid valve valve body has two, three channel mouth; For example, two two solenoid valve is a in and out (two channels, common) two three solenoid valve control liquid is a in and two out (two out respectively is a normally open a normally closed); Pneumatic reversing solenoid valve is one in one out one exhaust; Hydraulic oil comes in and out.
At home and abroad of the solenoid valve in principle can be divided into three categories (i.e., straight acting, direct acting and pilot operated in stages), and from a disc structure and material of the difference between the different and in principle is divided into six branches small class (diaphragm structure, step by step of moving heavy piece of membrane structure, the structure, the forerunner in straight moving piston structure, step by step piston structure, the forerunner of moving piston structure).
Contact Person: Mr. Brandon Bao