VALVE HAVING CHECK VALVES COMPRISING VALVE SEAT OPENING VALVE HOLE, AND VALVE BODY FIXED TO VALVE SHAFT

摘要

PURPOSE: A valve is provided to reliably prevent a back current of a fluid by check valves. CONSTITUTION: A valve has check valves in a valve chamber(4) formed between a fluid inlet(2) and a fluid outlet(3) in a valve box(1). The check valves are arranged in series. The check valve comprises a valve seat(6) opening a valve hole(5), and a valve body(8) fixed to a valve shaft(7) supported in a state of freely moving to the fluid inlet side and the fluid outlet side of the valve seat through the valve hole of the valve seat and arranged to the fluid outlet side of the valve seat. The valve body opens the valve hole by moving to the side separated from the valve seat when fluid pressure to the fluid outlet side from the fluid inlet side is received and the valve body closes the valve hole by moving to the valve seat direction and coming in contact with the valve seat when fluid pressure from the fluid inlet side from the fluid outlet side is received.