News

1. Posture methods can be divided into three categories:
Straight-moving. Leading. Staged straight-moving.
1. Direct acting principle: When the normally open and normally closed direct acting solenoid valve is plugged in, the magnet coil causes the eddy current adsorption force to increase the spool.
The switch off avoids the sealing pair of the high-pressure gate valve to open; when the power is turned off, the magnetic field force subsides, and the inspection is carried out with the help of the elastic force.
The shut-off member is pressed on the high-pressure gate valve, and the gate valve is closed. (reverse on and off)
Features: It can work normally in vacuum pump, negative pressure and zero differential pressure, but the volume of the electromagnetic induction head is relatively large, and the function loss is relatively early.
The conductive solenoid valve is large, and it is very easy to burn the solenoid coil when plugged in at high frequency. But the structure is simple and the application coverage is wide.
2. Principle of the dominant solenoid valve: When plugged in, the magnetic field force pushes the hydraulic control valve to open the hydraulic control valve, and the working pressure of the main valve in the chest and abdominal cavity decreases rapidly.
The pressure difference is generated between the left and right chambers of the main valve, and the closing part of the main valve is moved up by means of the working pressure of the material, and the gate valve is opened.
Running; when the power is turned off, the torsion spring force closes the hydraulic control valve, and the working pressure of the inlet material enters quickly according to the leading hole.
The thoracic and abdominal cavity of the main valve produces a pressure difference in the upper cavity, so that the main valve is closed.
Features: small size, low output power, but the range of material pressure difference is relatively limited, must meet the pressure difference standard. Electromagnetic induction head.
The function loss is small, it can be plugged in frequently, long-term plug-in, no damage, environmental protection and energy saving.
The body pressure range is limited, but it must meet the liquid pressure difference standard, but the liquid residue.
The pilot valve hole is very easy to block and is not suitable for liquid applications.
3. The principle of direct-acting solenoid valve in stages: the principle is that direct-acting and leading are closely combined. When plugging in, the solenoid valve first opens the auxiliary valve,
The working pressure of the lower cavity of the main valve exceeds the working pressure of the thoracic and abdominal cavity, and the pressure difference and the solenoid valve are used at the same time.
Open; when the power is turned off, the auxiliary valve uses the torsion spring force or the material working pressure to promote the downward movement of the shut-off piece.
The gate valve is closed.
Features: Zero differential pressure or high pressure can also work reliably, but the output power and volume are relatively large, so it must be installed vertically.
2. According to the place of work and the mouth at work.
Two-position two-way, two-position three-way, two-position five-way, three-position five-way, etc.
1. The two-position two-way valve core has two parts, two sockets, usually the air inlet is (P), and one is the exhaust port A.
2. Two three-way spools have two parts and three sockets, usually the air inlet is (P), and the other two are exhaust ports (A/B)
3. The two-position five-way spool has two parts and five sockets, usually the air inlet is (P), the A and B ports are the two exhaust ports that connect the cylinder, and the R and S are the air outlets.
4. Three-position five-way three-position five-way means that there are three working parts, which are generally controlled by two motors. When the two electromagnetic coils cannot be powered,
Under the balanced promotion of the torsion springs on both sides, the valve core is in the center, and the negative correlation effects are various.
Closed, middle exhaust pipes, etc., have the effect of turning off the power security.
Three, according to the manipulation method.
Single motor control, double electric control, mechanical equipment manipulation, pneumatic manipulation.
Fourth, overhaul the solenoid valve.
1. When the solenoid valve solenoid coil is powered off, manually press the commutation key on the oil circuit board. If it can be commutated normally, it means that there is no problem with the spool. If the phase change is not possible, remove the oil circuit board to clean the valve core.
2. For the DC24V solenoid coil, the positive and negative poles must be distinguished. After the positive and negative connection, the solenoid valve can be commutated normally, but the indicator light of the solenoid coil does not flash.