Remote Control Valve
TE RN
AL
(2) Main part functions The function of the spool (201) is to switch the oil path either to have the hydraulic pressure fed from the hydraulic pump received by the P port and lead the P port pressurized oil to the output ports (1, 2, 3, 4) or to lead the output port pressurized oil to the T port. The output pressure operating on this spool (201) is determined by the secondary pressure setting spring (241). In order to change the deflection quantity of the secondary setting spring (241), the push rod (212) is inserted into the plug (211) in such a way that it can slide. The return spring (221) operates on the casing (101) and spring seating (216) and operates to return the push rod (212) in the displacement zero direction regardless of the output pressure and makes the spool (201) neutral return reliable. It also has the effect of a counter-force spring for giving an operator an appropriate operation feel.
5. Operation
CO US N F E ID O E F N TS TI M AL GL : F O OR BA T L H
E
IN
Operation of the remote control valve is explained based on the hydraulic circuit diagram (Diagram 1) and operation explanation diagrams (Diagram 2 - Diagram 4). Diagram 1 is a typical usage example for the remote control valve.
Diagram 1 Remote control valve usage example 1
Remote control valve
4
Control valve
2
Pilot pump
5
Hydraulic motor
3
Main pump
6
Hydraulic cylinder
(1) When the handle is in neutral (See Diagram 2.) The secondary pressure setting spring (241) that determines the remote control valve output pressure does not act on the spool (201). Therefore, the spool (201) is pressed up by the return spring (221) (spring seating 1 (216)) and the pressure flows through the output ports (2 and 4) and the T port, so the output pressure becomes the same as the tank pressure.
Diagram 2 When the handle is in neutral ASM-17-25-002EN
211 4
