Patent ID: 7232108
Filing Date: 2007-06-19
Classification: F16K

Abstract:
1. An exhaust valve for a bag comprising; a valve body adapted to be fitted to the bag by sandwiching or bonding a part of the bag from inner and outer surfaces of the bag with fusion, a center part of the valve body having an exhaust opening for communicating with an opening between the inner and the outer surfaces of the bag, a lid body detachably fitted to the valve body, said lid body having a suction opening in a central part thereof, a valve plate arranged above an upper end of the exhaust opening to move up and open the exhaust opening at the time of exhaust of the bag and to move down and close the exhaust opening after aeration of the bag, and a lock mechanism arranged on a lower surface of the lid body to keep the exhaust opening closed by pressing the valve plate downwardly when the lid body is turned in one direction around the valve plate and to allow the valve plate to move up and down when the lid body is turned in another direction, wherein the lock mechanism comprises a plurality of cam projections mounted to project on an upper surface of an outer peripheral edge of the valve plate at predetermined intervals in a peripheral direction, and engaging projections mounted to project on an outer peripheral part of the suction opening in the lower surface of the lid body, whereby the engaging projections are engaged with an upper end surface of the cam projections by a turning operation of the lid body in a direction so as to keep the valve plate closed, and the engaging projections are disengaged with the upper end surface of the cam projections by a turning operation of the lid body in another direction so as to allow the valve plate to move up and down.