R901391390 Bosch Rexroth Directional spool valve

The 5-chamber directional valve type 5-.WE is a solenoid-actuated directional spool valve with switching time increase. It controls the start, stop and direction of a flow. The directional valve basically consists of housing (1), one or two electronic solenoids (2), control spool (3), and the return springs (4). In de-energized condition, the control spool (3) is held in the central position or in the initial position by the return springs (4) (except for valves without spring "O"). If the wet-pin electronic solenoid (2) is energized, the control spool (3) moves out of its rest position into the required end position. In this way, the required direction of flow according to the selected symbol is released. After the electronic solenoid (2) has been switched off, the control spool (3) is pushed back into the central position or in the initial position (except for valve with "OF" detent and valve without spring type "O"). A manual override (6) allows for the manual switching of the valve without solenoid energization. To ensure proper functioning, make sure that the pressure chamber of the solenoid is filled with oil. Type 5-4WE 10 … Throttle insert Using a throttle insert (9) in channels P, A, B or T, the flow resistance at the valve can be increased. Its use is required when, due to prevailing operating conditions, flows occur during the switching processes, which exceed the performance limit of the valve. Without spring return “O” (only possible with symbols A, C and D) This version is a directional valve with 2 spool positions and 2 electronic solenoids without detent. The valve without spring return at the control spool (3) does not have a defined basic position in the de-energized condition. Without spring return with detent “OF” (only possible with symbols A, C and D) This version is a directional valve with 2 spool positions and 2 electronic solenoids with detent. The detents are used to lock the control spool (3) in the relevant spool position. During operation, continuous application of current to the electronic solenoid can thus be omitted which contributes to energy-efficient operation. Notice: Pressure peaks in the tank line to two or several valves can result in unintended movements of the control spool in the case of valves with detent. We therefore recommend that separate return lines be provided or a check valve installed in the tank line. Influencing the switching time With the 5-chamber directional valve type 5-.WE, the switching time can be delayed to 100 ms and more by means of a throttle screw "C" (7) or a selected orifice "A0.” (8). In this connection, the switching time is pressure-, flow- and viscosity-dependent, specific to the installation. The switching time is influenced by means of a restriction (throttle or orifice) in the connection channel (5) between the two spring chambers in which the liquid volume is displaced from one spring chamber into the other in case of a switching process. The T channels are separated from the spring chambers in order to achieve soft switching. Notices! The adjustment spindle (10) may only be screwed out so that it protrudes from the nut by max. 3 mm.