Hydraulic System and Pressure Limiting Valve

Abstract

A hydraulic system has at least one consumer and at least one hydraulic pump. A pressure limiting valve for limiting the maximum system pressure is connected with the at least one hydraulic pump, and the pressure limiting valve is pilot-controlled for switching a bypass. The invention also concerns a pressure limiting valve for limiting the system pressure inside such a hydraulic system.

1 . A hydraulic system comprising:
 at least one consumer,   at least one hydraulic pump, and   a pressure limiting valve for limiting a maximum system pressure connected with the at least one hydraulic pump,   wherein the pressure limiting valve is pilot-controlled for switching a bypass.   
     
     
         2 . The hydraulic system according to  claim 1 , wherein pilot control of the pressure limiting valve provides for a proportional control of the system pressure to be limited. 
     
     
         3 . The hydraulic system according to  claim 1 , wherein pilot control of the pressure limiting valve is effected electrically, electro-hydraulically, or electrically and electro-hydraulically. 
     
     
         4 . The hydraulic system according to  claim 1 , wherein pilot control of the pressure limiting valve is effected hydraulically, pneumatically, or hydraulically and pneumatically. 
     
     
         5 . The hydraulic system according to  claim 1 , wherein the pressure limiting valve has a cartridge design, a gate design, or a cartridge and gate design. 
     
     
         6 . The hydraulic system according to  claim 1 , wherein pilot control of the pressure limiting valve acts against at least one of a spring restoring force and a system pressure. 
     
     
         7 . The hydraulic system according to  claim 1 , wherein the pressure limiting valve does not allow an increase of the system pressure without actuation. 
     
     
         8 . A hydraulic system comprising:
 at least one consumer,   at least one hydraulic pump, and   a pressure limiting valve for limiting a maximum system pressure connected with the at least one hydraulic pump,   wherein the pressure limiting valve is pilot-controlled in order to additionally carry out a pressure build-up or pressure control function as well as limiting the maximum system pressure.   
     
     
         9 . The hydraulic system according to  claim 8 , wherein the pressure limiting valve is pilot-controlled for switching a bypass. 
     
     
         10 . The hydraulic system according to  claim 8 , wherein pilot control of the pressure limiting valve provides for a proportional control of the system pressure to be limited. 
     
     
         11 . The hydraulic system according to  claim 8 , wherein pilot control of the pressure limiting valve is effected electrically, electro-hydraulically, or electrically and electro-hydraulically. 
     
     
         12 . The hydraulic system according to  claim 8 , wherein pilot control of the pressure limiting valve is effected hydraulically, pneumatically, or hydraulically and pneumatically. 
     
     
         13 . The hydraulic system according to  claim 8 , wherein the pressure limiting valve has a cartridge design, a gate design, or a cartridge and gate design. 
     
     
         14 . The hydraulic system according to  claim 8 , wherein pilot control of the pressure limiting valve acts against at least one of a spring restoring force and a system pressure. 
     
     
         15 . The hydraulic system according to  claim 8 , wherein the pressure limiting valve does not allow an increase of the system pressure without actuation. 
     
     
         16 . A pressure limiting valve for limiting the system pressure inside a hydraulic system, wherein the pressure limiting valve is pilot-controlled and pilot control of the pressure limiting valve acts against at least one of a spring restoring force and an input pressure.