| 摘要 |
<p>A pressure control device of heavy equipment is provided to smoothly drive a work unit of high load pressure by restrain a working fluid from being supplied to a work unit of low load pressure. A pressure control device of heavy equipment includes a valve body(5), a spool(13), and a signal pressure port(4). An input port, an output port, and a drain port are formed in the valve body. The spool is installed in the valve body. The spool communicates the input port and the output port when switched by the pressure supplied form the input port and the pressure added by the resilient force of a valve spring and interrupts the input port and the output port when switched by the pressure supplied from the output port. The signal pressure port supplies a signal pressure to a hydraulic pressure section of the spool located in a third pressure chamber formed in the valve body and interrupts the input port and the output port by switching the spool by the pressure of a second pressure chamber and the signal pressure. The signal pressure port feedbacks the pressure of the output port to the drain port. The operation pressure supplied from the input port to the output port is controlled by switching the spool in correspondence to a signal pressure introduced into the third pressure chamber.</p> |
