Description Size 16 … 50 Component series 7X Size 16 … 50 Component series 7X Product description General 2-way cartridge valves for pressure functions are pilot-operated valves in seat or spool design. The power section designed as cartridge valve (1) is installed into a receiving hole standardized according to DIN ISO 7368 and closed with a control cover (2). The pilot control valve (4) for manual or electrically proportional pressure adjustment is integrated into the control cover (2) or is installed on the control cover (2) as pilot valve with mounting dimensions according to DIN 24 340. By combination of cartridge valves with the control covers, different pressure functions can be realized. . Pressure sequencing functions This function enables pressure-dependent connection of a second system. The required switching pressure is set at the pilot control valve integrated into the control cover. The pilot oil supply may either be realized externally (pilot oil port X) or internally (from port A via pilot oil ports X or Z2). The pilot control spring chamber is directed via ports Y or Z1, depressurized to the tank. Circuit examples Example 1: (Circuit for pressure-dependent unloading of the low-pressure system) In the illustrated circuit, the system is supplied via a high-pressure and a low-pressure pump. The system pressure pS acts externally from the high-pressure side via pilot oil port X on the pilot control valve, which sets the low-pressure side to depressurized circulation after the set pressure value is reached. The check valve RV (not included in the scope of delivery) prevents the connection of the high-pressure system with the now depressurized low-pressure system. On reaching the pressure set at the pilot control spring, the pilot control valve is switched and the spring chamber of the main valve to the tank is unloaded. The main spool is opened and the connection A to B is released. With the version LFA..DZW..., the required switching position can be selected besides the hydraulic circuit by means of an electrically operated pilot control valve (not included in the scope of delivery of the control cover LFA..DZ...). Example 2: (Circuit for pressure-dependent connection of a second system) With this circuit, system 2 is not connected before the pressure in system 1 complies with the specified value. Pilot oil discharge is realized internally from port A of the main valve. Type code General information on the control cover for the pressure sequencing function 01 02 03 04 05 06 07 08 LFA DZWB ‒ 7X / Type 01 Control cover LFA LFA Size 02 NG 16 16 NG 25 25 NG 32 63 NG 40 40 NG 50 50 Version 03 Pressure sequencing function: Solenoid non-energized - open; solenoid energized - DZ function DZWB 1) Adjustment type for pressure adjustment 04 Rotary knob 1 Sleeve with hexagon and protective cap 2 Lockable rotary knob with scale (H-locking according to automotive standard) 3 Rotary knob with scale 4 Component series 05 Component series 70 ... 79 (
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