SAFETY VALVE UNIT Russian patent published in 1997 - IPC

FIELD: hydraulic engineering. SUBSTANCE: safety valve unit is mounted in one housing with protective device made in form of spool valve and spring-loaded on either side through supports. This device is used to protect two power mains connected with vent line through two check valves and brought to end of spool valve. When spool valve moves to either side, these mains are interconnected through diametrically opposite passages provided in housing; passages are brought to its working surface. EFFECT: enhanced reliability. 2 dwg