VIS Hydraulics CVT0.U78

A screw-in, cartridge style, direct acting, poppet type check valve. Main use is as a blocking or load-holding device. The CVT0.U78allows flow passage from port 1 to 2: the cartridge has a fully guided check which is spring-biased closed until sufficient pressure isapplied at port 1 to open to 2. The flow is blocked in the opposite direction (2 to 1). Small amount of oil is allowed from 2 to 1 whenthe pressure on port 2 increase caused by the thermal expansion and meet the thermal relief setting pressure. This functionprevents circuit damage that should be caused by thermal expansion.