SHUTTING OFF VENTILATION VALVE PREVENTING AGAINST OVERFLOW Russian patent published in 2005 - IPC

FIELD: valving.

SUBSTANCE: valve (10) comprises housing (12) with closed space (18). The housing is provided with outlet passages (20) for supplying fluid into closed space (18), outlet passage (22) for fluid in the top part of closed space (18), and seat (24). Seat (24) closes outlet passage (22). Valving unit (30) is mounted in closed space (18) and has member (32) of the first stage and member (34) of the second stage. The members are made for permitting coaxial movement inside housing (12). The bottom end of member (32) of the first stage is provided with elongated slot-like inlet port. The top end is provided with outlet port (36) which is in communication with the inlet port. Member (32) is made for permitting axial movement between the first and second positions. In the first position outlet port (36) is disengaged from outlet passage (22). Member (34) of the second stage is made of a float. The float is provided with a flexible strip made of closing diaphragm (66). One end of the diaphragm is secured to top wall (62) of the float. Closing diaphragm (66) faces the outlet port of member (32) of the first stage. Member (34) of the second stage is made for permitting movement between the first and second positions. In the first position closing diaphragm tightly closes the inlet port. In the second position the closing diaphragm gradually opens it. There is at least one fastening member (42). The fastening member passes between member (32) of the first stage and member (34) of the second stage. The displacement of member (34) of the second stage to the second position causes forced displacement of member (32) of the first stage to its second position. Projections (46) of fastening members (42) made of lags of member (32) of the first stage are set in slots (70) of member (34) of the second stage for sliding. Projections (72) of the member of the second stage are set for sliding in slots of member (32) of the first stage.

EFFECT: enhanced reliability and expended functional capabilities of the valve.

13 cl