What is a reversing solenoid valve?
The reversing solenoid valve, also known as the solenoid valve, uses the suction force of an electromagnet to control the movement of the valve core to achieve reversing. An electromagnetic valve consists of two parts: a spool valve and an electromagnet.
According to the different power sources, electromagnets can be divided into two types: AC electromagnets and DC electromagnets.
According to whether the armature of the electromagnet is immersed in oil, electromagnets can be divided into dry-type and wet-type.
Advantages, disadvantages, and applications of directional control solenoid valves
It is quick in action, convenient to operat,e and easy to achieve automatic control. Due to the size limitation of the electromagnet, the electromagnetic force is limited and can only be used in systems with small flow rates.
The working principle of the reversing solenoid valve
There is a movable valve core inside the valve. On each side of the valve, there is an electromagnet. When one side is powered on, the valve core moves to that side under the action of the electromagnet, and the other side is connected. When there is a power outage, the valve core returns to the middle by the spring. Whether there is a passage in the middle depends on its neutral function. O-type is not connected, H-type is connected, and so on.
The reversing solenoid valve adopts wet AC or DC electromagnets. The solenoid valve controls the different working positions of the valve core through an electromagnet. When the electromagnet is de-energized, the valve core is kept in the middle or terminal position by the spring pressure (except for pulse valves). When the electromagnet is energized, the valve core is pushed to the working position. After the power is cut off, it returns to the initial state. At this time, pushing the fault check button by hand can move the valve core.
As the wet electromagnet is internally connected to the return oil chamber, the armature moves in the oil, which can reduce wear, buffer, and improve heat dissipation performance, thereby extending the service life. The AC electromagnet has the characteristics of short action time, simple electrical control circuit and no need for special contact protection. Dc electromagnets have soft switching characteristics, high operating frequency, are not sensitive to overload or low voltage, and operate reliably.
Two-position three-way electromagnetic directional control valve
When power is cut off: P→A and B are not connected.
When powered on: P→B, A is not connected.
2) Three-position four-way electromagnetic directional control valve
When all the electromagnets are de-energized: P, A, B and T are all disconnected.
When the electromagnet at the left end is energized: P→A, B→T.
When the electromagnet at the right end is energized: P→B, A→T.
The structure of the reversing solenoid valve
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