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2 Way Reversing Valve

Ⅰ . Overview Type 24EJF-P (originally type SA-V) 2-position 4-way reversing valve is an integrated reversing control unit of which valve piston moves driven by DC motor to open and close grease supply line or reverse the direction of grease supply; even if in severe working condition (such as...

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 . Overview
 Type 24EJF-P  (originally type SA-V) 2-position 4-way reversing valve is an integrated  reversing control unit of which valve piston moves driven by DC motor to open  and close grease supply line or reverse the direction of grease supply; even if  in severe working condition (such as low temperature or high viscosity grease),  it is still quite reliable.
 The  valve applies to the grease or oil centralized lubricating system under PN  40Mpa and the main and branch line of hydraulic system which at the meanwhile  can be used in the three forms including 2-position 4-way, 2-position 3-way and  2-position 2-way.


. Technical parameters


       Model

Nominal    pressure
       (MPa)

Reversing    time
       (S)

Power    of DC motor
       (W)

Supply    voltage
       (V)

Torque    of DC motor
       (N.m)

Weight
       (kg)

24EJF-P

40(P)

0.5

40

~220

20

13

Use  grease with minimum cone penetration 220(25℃,150g) 1/10mm (NLGI0#~3#) or lubricating  oil with minimum viscosity grade N68. Working environment temperature is -20~80℃.


. Dimensions

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. Working principle
 This valve  is composed of DC motor, limit switch, reversing valve, rectifier transformer  and other components which are installed on the same baseboard and put within  the protective cover shell.
 The electric  control box in the system sends out a reversing signal (sent out by the  differential pressure switch on the system end) to make DC motor start rotary  movement, and drive valve piston to do straight line round movement through  eccentric gear. When the valve piston arrives at the required reversing position  from the home position, the baffle on the end of valve piston touches the limit  switch to send an electric signal to the electric control box, ordering DC  motor to stop rotation, therefore for the purpose of reversing process.

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.  Use instruction

  1. This valve should be installed on the front end  of the controlled  main and branch line of the system and the area where it is well-ventilated,  dry for the convenience of inspection and there is no moving mechanism around.

  2. When in the use as 2-position 2-way, the grease  outlet “B” and returning port  should be  plugged.

  3. When in the use as 2-position 3-way, the grease  outlet “B” should be plugged.

  4. Electrically controlled wiring should be  connected in accordance with the principle provided in the schematic diagram  above.


.  Common faults and troubleshooting

  1. The reversing valve does not reverse.

Maybe because no reversing signal is input into  motor; the weld of weld drops; the motor shaft and eccentric gear are loose and  not tightened; impurity substance gets in the valve chamber; sliding piston blocks and  so on.  Remove the faults after finding  out the reason.

  1. Grease leakage on the two ends of sliding piston.

Mainly caused by the damage of sealing ring on  two ends, maybe it is because the sealing ring has a long time of stock or has  the sign of aging for long time of use. It is suggested to replace sealing  ring.

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