公开(公告)号：US3733969A

公开(公告)日：1973-05-22

申请号：US3733969D

申请日：1971-03-15

Applicant: MC DONNELL DOUGLAS CORP

Inventor： ANDREWS R

IPC: F15B20/00 ,  F16K17/22 ,  F15B13/042

CPC classification number: F16K17/22 ,  F15B20/005

Abstract: A hydraulic system has a high pressure supply line, a low pressure return line maintained at a pressure above the ambient pressure, and a plurality of subsystems connected between the supply and return lines. At least some of the subsystems individually include a selector valve and a hydraulically operated device. The selector valve is connected to the high pressure supply line and also to the return line, the latter connection being through a discharge line. The selector valve is also connected to the hydraulically operated device for diverting high pressure fluid thereto. A check valve is interposed in the discharge line for permitting fluid to flow from the discharge line to the return line, but not in the reverse direction, and consequently before fluid will flow past the check valve into the return line the pressure within the discharge line must equal that in the return line. Each subsystem of the foregoing nature further includes a shutoff valve which senses the return pressure in the discharge line and prevents high pressure fluid from being diverted to the hydraulically operated device when the pressure in the discharge line falls off. Accordingly, should the discharge line or any line in common with it rupture, the shutoff valve will close and the subsystem will be rendered inactive, thus preventing the loss of hydraulic fluid through the rupture when an attempt is made to operate selector valve of the ruptured subsystem. A substantial loss of hydraulic fluid through the rupture would of course result in the failure of the entire hydraulic system.