Bosch Rexroth DBET-1-6X/200G24XEJV R901188001

General information Proportional pressure relief valves of type DBET...XE... are remote control valves with seat design and are used for system pressure limitation. Operation is effected by means of proportional solenoid. The interior of the solenoid is connected to port T or Y and is filled with the hydraulic fluid. Dependent on the electric command value, these valves can be used to steplessly set the system pressure to be limited. The solenoids are controlled by an external amplifier of type VG-MSPA1-200 (see data sheet 30223200). The latter must not provide the solenoid with a current of more than 1.0 A. In order to achieve this prescribed safety when operating the valve in the potentially explosive area, the solenoid current must be monitored and limited. This is to be ensured by means of the VT-MUXA2 safety module (see data sheet 30290). Set-up The valve basically consists of:

• Housing with connection surface (1)

• Proportional solenoid (2)

• Valve seat (3)

• Valve poppet (4

• Armature plunger (5)

Basic principle For the setting of the system pressure, a command value is specified at the control electronics. Dependent on the command value, the electronics actuate the solenoid coil with electric current. The proportional solenoid converts the electric current into mechanical force that acts on the valve poppet (4) via the armature plunger (5). The valve poppet (4) pushes onto the valve seat (3) and blocks the connection between port P and T or Y. If the hydraulic force on the valve poppet (4) equals the solenoid force, the valve controls the set pressure by lifting the valve poppet (4) off the valve seat (3) and thus enabling hydraulic fluid to flow from port P to T or Y. If the command value is zero, the control electronics only apply the minimum control current to the proportional solenoid (2) and the minimum set pressure is set. DBET...XE DBET.../...Y...XE