| 摘要 |
<p>The unit maintains the desired pressure in a pressure medium system. Connected to the sytem is a control cylinder (2), which contains a spring-loaded displaceable control piston (4) subjected to system pressure. The piston rod (6) carries a control block (9) with frictioned engagement in the form of friction rings (8). The control block actuates a micro switch (11), the block movement being limited by stops (7, 10) to a small stroke. The micro switch excites a solenoid (20) with an armature (19) carrying a locking element (18), with an actuator (16) acting on the rod (15) of a switch piston (13). This piston is charged by overflow pressure (Pu) from the maximum pressure valve or from the reducing valve of the system.</p> |
