초록 ▼

A pressure relief valve and especially such a valve for use in the lid or other part of a cooking vessel. It is a feature of the valve that it automatically opens in response to certain pressure conditions, and requires manual resetting to the closed condition. The valve includes a closure member wh

A pressure relief valve and especially such a valve for use in the lid or other part of a cooking vessel. It is a feature of the valve that it automatically opens in response to certain pressure conditions, and requires manual resetting to the closed condition. The valve includes a closure member which is movable between valve open and valve closed positions, and a configuration dependent hold-open member which is operative, in one configuration, to bias the closure member into the open position and to hold it in that position. The hold-open member is annular and has a frusto-conical form in the operative configuration. An actuator is operable to move the closure member from the open position to the closed position, and the hold-open member responds to that movement by adopting a reversed conical configuration. The hold-open member is subjected to stress when moving between the two conical configurations and that stress is at least partially relieved at each of the open and closed positions of the valve. Because of that stress relief, the hold-open member has an oppositely directed biasing effect on the closure member in each of the two conditions of the valve.

대표청구항 ▼

A pressure responsive valve including, means defining an opening through which communication occurs between two sides of the valve, a closure member which is operative to control said communication and which is mounted for movement between a closed position at which said communication is prevented a

A pressure responsive valve including, means defining an opening through which communication occurs between two sides of the valve, a closure member which is operative to control said communication and which is mounted for movement between a closed position at which said communication is prevented and an open positioned at which said communication is permitted, said valve being responsive to a pressure differential between said sides so as to cause said closure member to move from the closed position towards the open position, and hold-open means which is configuration dependent and is flexibly distortable between an configuration and concave on a side opposite to said one side when in a said different configuration, said plate-like member being responsive to movement of said actuator so as to adopt a said different configuration when said actuator is in said closed position and to adopt a said operative configuration when said actuator is at a position spaced from said closed position, and said hold-open means being operative to hold said actuator in said open position in the absence of a closing force manually applied to said actuator which is sufficient to overcome said hold-open means bias and move said actuator into said closed position.