Normally closed solenoid valve.

摘要

There is disclosed a normally closed solenoid valve arranged to remain in an open condition notwithstanding reverse fluid flow through the valve. The valve includes an outer casing (14) having a first bore means (32) and a second bore means (34). A poppet (16) within the casing (14) is movable between open and closed valve positions. The poppet (16) includes an input orifice (42) and an output orifice (46). A plunger (18) forces the poppet (16) into the closed valve position while blocking its output orifice (46) and unblocks the output orifice (46) for permitting the poppet (16) to move into the open valve position. Fluid flow restricting means (20) disposed between the output orifice (46) and the second bore means (34) restricts fluid flow between the output orifice (46) and the second bore means (34) to one direction to permit the valve to open while precluding the valve from closing upon reverse fluid flow through the valve from the second bore means (34) to the first bore means (32).