Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic) Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic)

Solenoid valve working principle

Solenoid valve working principle

Normally closed: when the coil is energized, the pilot valve core suction, pilot hole open, valve upper chamber pressure relief, the piston by the lower chamber media pressure, electromagnetic valve open; When the coil power, the pilot valve core by spring reset, pilot hole closed, the valve chamber by the piston throttle hole pressurized and reset spring thrust, solenoid valve closed.
 
Normally open: when the coil is energized, the pilot hole is closed, the valve chamber is pressurized by the piston throttle hole and the reset spring thrust, the solenoid valve is closed. When the coil power, the pilot valve core by spring reset, pilot hole open, valve on the cavity pressure relief, the piston by the lower chamber of the media pressure push, solenoid valve open.
 
Normally closed solenoid valve action principle: to the coil power, air circuit on, once the coil power off, the air circuit will be disconnected, this is equivalent to "inmotion".
 
Normally open solenoid valve action principle: to the coil power, the air circuit is disconnected, once the coil power off, the air circuit will be connected, this is "inching".
 
The choice is usually based on the duration of work: normally closed, normally open, or continuously powered on.
 
1, when the solenoid valve needs to open for a long time, and the duration of the time of excess closing time should be selected normally open type.
 
2, if the opening time is short or the opening and closing time is not long, choose the normally closed type.
 
 
Solenoid valve features:
 
1. Low density and high filling;
 
2. Aging resistance;
 
3. Corrosion resistance;
 
4, water vapor resistance;
 
5. Resistance to hot water;
 
6. Electrical performance;
 
7. Elasticity;
 
8. Adhesion.
 
Classification of solenoid valve:
 
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 control and double control, refers to the number of electromagnetic coils, single-coil called single control, double-coil called double control, 2-bit 2-through, 2-bit 3-through is generally single control (single coil), 2-bit 4-through, 2-bit 5-through can be single control (single coil), can also be double 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 type, direct acting type, compound type, recoil-type, self-maintaining type, pulse type, bistable, two-way, etc..
 
Three, according to the use of electromagnetic valve material can be divided into: cast iron body, copper body (cast copper, wrought copper), cast steel body, stainless steel body (304, 316, etc.), non-metallic materials (ABS, PTFE).
 
Iv. According to the different pressures of the pipe medium, 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 (10~50Mpa).
 
V. ac voltage: AC220V, 380V, 110V, 24V; Dc voltage: DC24V, 12V, 6V, 220V; Generally, the commonly used voltage is AC220V DC24V, so it is recommended that users should choose the commonly used voltage and special voltage for a long supply cycle.
 
Six, according to the electromagnetic valve protection level can be divided into: explosion-proof, waterproof, outdoor protection performance: waterproof, explosion-proof (Exd IICT4, (Exd IICT5), corrosion protection.
 
Direct acting solenoid valve:
 
Principle: when electrified, the electromagnetic coil generates electromagnetic force to lift the shut-off from the valve seat and open the valve; When power failure, the electromagnetic force disappears, the spring pressure on the valve seat, valve closed.
 
Features: can work normally under vacuum, negative pressure and zero pressure.
 
Distributed direct-acting solenoid valve:
 
Principle: it is a direct movement and pilot type combined with the principle, when the inlet and outlet no pressure difference, electrified, electromagnetic force directly put the pilot valve and the main valve closed parts successively upward lift, valve open. When the inlet and outlet reach the starting pressure difference, after electrification, the electromagnetic pilot small valve, the pressure of the lower chamber of the main valve rises, the pressure of the upper chamber drops, thus using the pressure difference to push the main valve upward; When the power is cut off, the pilot valve USES the spring force or the medium pressure to push the closing part, moves downward, causes the valve to close.
 
Pilot type solenoid valve:
 
Principle: when electrified, the electromagnetic force to open the pilot hole, the pressure of the upper chamber rapidly decreased, in the closing parts around the formation of a high pressure difference, fluid pressure to push the closing parts upward movement, valve open; When the power is cut off, the spring force to close the pilot hole, the inlet pressure through the bypass hole quickly chamber around the valve closing components to form a low on high pressure difference, fluid pressure to push the closing components to move down, close the valve.
 
 
Solenoid valve two is refers to the solenoid valve spool has two different working position (open, close). Solenoid valve two, three refers to the solenoid valve body has two, three openings; For example, two two-way solenoid valve is one in one out (two channels, the most common) two three-way solenoid valve control liquid is one in two out (two out is a normally open one normally closed); Pneumatic directional solenoid valve is one in one out one exhaust; Hydraulic one in and one out oil.

The above:

Contact Us

Name: Mr Xiong

Tel: +0086-13509210189

E-mail: northman1987@hotmail.com

Skype: robby.xiong

QQ: 364129104

WeChat: 364129104

Add: NO13 Dalang ,Longhua Dist, Shenzhen, Guangdong Province, China