1. Overview

The 24EJF-M type (original SA-V type) two-position four-way reversing valve is an integrated reversing control device that uses a DC motor to drive the spool movement to open and close the oil supply pipeline or change the oil supply direction. ; Even under harsh working conditions (such as low temperature or high viscosity grease), the action is still quite reliable.

This valve is suitable for dry and thin oil centralized lubrication systems with nominal pressures below 40 MPa and the main branch pipelines of hydraulic systems. It can also be used in three types: 2-position 4-way, 2-position 3-way and 2-position 2-way. .

4. Working principle

The valve mainly consists of DC motor, limit switch, reversing valve body, rectifier transformer device and other componentsDry thin oil lubricationIt is installed on the same base plate and placed inside the protective cover.

The electric control box in the system sends out a reversal signal (sent by the pressure difference switch at the end of the system) to cause the DC motor to rotate and drive the valve core to make linear reciprocating motion through the eccentric. When the valve core reaches the required reversing position from the original position, the baffle at the end of the valve core triggers the limit switch, sends an electrical signal to the electric control box, and orders the DC motor to stop rotating, completing the reversing process.

6. Instructions for use

1. The valve should be installed at the front end of the controlled main and branch pipelines of the system, and should be located in a ventilated, dry place that is convenient for inspection and without interference from surrounding moving mechanisms.

2. When used as a 2-position 2-way, the oil outlet "B" and oil return port "R" must be blocked.

3. When used as a two-position three-way, the oil outlet "B" must be blocked.

4. The electronic control wiring is connected according to the principle on the right.

7. Common faults and troubleshooting methods

1. The reversing valve does not change direction.

There may be no commutation signal input to the motor, the welding pins have fallen off; the motor shaft and eccentric wheel are loose and not tightened; impurities enter the valve cavity and the sliding core is stuck. These reasons can be identified and eliminated.

2. Oil leaks from both ends of the sliding core.

It is mainly caused by damage to the sealing rings at both ends. It may be that the sealing rings have been in stock for a long time or have aged after being used for a long time. Just replace the sealing rings.