Function X3 - Pressure reducing with mounting face for size 03 pilot valve mounting face for size 03 pilot valve
Unlike other cartridge valve inserts, the reducer insert contains a spool rather than a poppet. Therefore, no reference is made to an area ratio in relation to reducing valves. The reducing valve is normally closed. It varies flow to provide a constant outlet pressure below that of the inlet pressure. The pressure differential between inlet and outlet must be at least 5 bar (72 psi) for optimum reduced pressure control for low flows.
System pressure at B is communicated through a compensated flow control in the X or X3 cover into area AP. This flow control maintains a constant flow across the cover poppet, independent of the main flow from B(P1) to A(P2), thereby providing pressure stability at all system flow rates. Load pressure transients are relieved through the check valve located in the insert spool and are limited by the pilot pressure control in the cover.
The Z1 port is used for remote control of the reduced pressure. Suitable remote controls are the C-175 and CGR-02. Venting of the Z1 port will cause outlet pressure A(P2) to drop to a minimum pressure related to the spring load in the insert spool. The Z1 port should be blocked when not required. The Y port is used to drain the pilot oil.
Dual reduced pressure functions are available using the model X3 cover and CVGC-3 module. The X3 cover has a mounting pad with an ISO 4401, size 03 (ANSI/B93.7MD03) interface that accepts pilot valve DG4V-3-2AL (two position, spring offset type) or DG4V-3-2N (two-position mechanical detent type). For information on the DG4V-3 valve. Air operated DG18V-3 or DG17V-3 manually operated pilots are also applicable. An electrically modulated proportional pilot is available that can provide infinitely variable reduced pressure settings and a vent condition.
Pressure Reducing with Manual Adjustment and Remote Control: Sizes 16 to 40
Reduced pressure at A(P2) is controlled by the manual adjuster in the cover. Pilot port Z1 is used for remote control.
Dual Level Reduced Pressure by Remote Electrical Selection: Sizes 16 to 40
Control is at the X3 cover when the DG4V-3-2AL is de-energized or the DG4V-3-2N “b” solenoid is momentarily energized. Control is at the CVGC-3 module, sandwiched between the cover and pilot valve, when the DG4V-3-2AL solenoid “a” is energized or solenoid “a” of the DG4V-3-2N is energized. In each case, the pressure set at the X3 cover should be the higher of the two levels.
Pressure Reducing Function by Electrohydraulic Proportional Control: Sizes 16 to 40
The electrically modulated pilot controls pressure below the maximum manually set level at the X3 cover. Reduced pressure is proportional to the applied current. Increasing current to the pilot increases the reduced pressure at port A(P2). The pilot valve can be any of those charted below, depending on the working pressure involved.