Proportional Pilot Operated Pressure Relief Valves 7/8-14 UNF • pmax 350 bar (5076 PSI) • Qmax 60 L/min (15.85GPM) Screw-in cartridge design Pilot operated Three pressure ranges Pressure output proportional to DC current input Functional Description The valve is designed for continuous regulation of pressure in the circuit. The valve is pilot operated using the pilot stage of SR1P2-A2 execution. Due to two stage pilot design the valve is able to control high hydraulic power in circuit. The complete valve consist of pilot stage valve SR1P2-A2 and main stage size 7/8-14 UNF. In the basic position (with the coil de-energized) the port P is fully open to the tank. Connection to the pilot stage is realized with nozzles (5) and (6) and the spring chamber (4) is unloaded to the tank port. When the DC current is applied to solenoid (10) at spring (9) increases force to the seat (8) and it continuously closes. Build up pressure acts on spool (3) in spring chamber (4) against the pressure line P thus closing the P line to the Tank port. Build up pressure P in system is proportional to the energizing current at solenoid (10). The minimum value of cracking pressure can be adjusted using the screw (12), position of which is secured with nut (11). The adjusting screw (12) can be used as emergency control. Screw (13) is used to air bleed the solenoid control system. To ensure self bleeding of the valve it is recommended to install it in a vertical position with the solenoid facing downwards. Bleeding process is necessary for the proper function of the valve. Pilot stage valve SR1P2-A2 (catalogue no. HA 5122) can be ordered separately as a built-in proportional directly operated pressure relief valve. The main stage of the valve can be also ordered separately – see spare parts. The valve body and the adjustment screw are zinc coated. The valve opens when the increasing pressure on P line reaches value set by proportional solenoid (10). In this situation the main spool (3) shift to open the Tank line against the spring (4).

Ordering Code Proportional Pilot Operated Pressure Relief Valves 7/8-14UNF High performance Type of solenoid coil Nominal solenoid supply voltage Connector EN 175301-803-A with quenching diode Connector AMP Junior Timer with quenching diode Connector Deutsch DT04-2P with quenching diode Other coils on demand see catalog HA8007. Technical Data Valve size Cartridge Cavity Maximum operating pressure at ports P Maximum operating pressure at ports T* Flow range Hydraulic fluid Fluid temperature range (FPM) Ambient temperature range Viscosity range Duty cycle Enclosure type to EN 60 529 Maximum valve...

The proportional pressure relief valve is not mechanically protected and it does not perform the relief valve function. Pressure range 35 Pressure range 21 Type of the Solenoid Coil Note: Example of most frequent coil types. For complete range valve coils with technical informatik about voltage, enclosure type, terminal box please afer to coil data sheet HA 8007. Coil example Connector EN 175301-803-A with quenching diode Connector EN 175301-803-A with quenching diode Connector AMP Junior Timer with quenching diode Connector AMP Junior Timer with quenching diode Type code Connector Deutsch DT04-2P...

Dimensions in millimeters and (inches) Spare Parts Solenoid coil Nominal voltage coil Ordering number Main valve Dimensions, quantity Seal kit (Main valve) Ordering number Ordering number Seal kit (Pilot valve) The packing foil is recyclable. The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should not be construed in any case as a guaranteed representation of the product properties in the sense of the law. ARGO-HYTOS s.r.o. CZ - 543 15 Vrchlabí tel.: +420-499-403 111 e-mail: [email protected] www.argo-hytos.com 4 Subject to...