초록 ▼

A unidirectional valve (7) forms a reduced meatus which extends in the direction of the obturator (23) movement, which meatus is to be passed through by possible microleaks in case of losses in the actuator branch (3); a considerable run of the obturator (23) in the presence of microleaks and of con

A unidirectional valve (7) forms a reduced meatus which extends in the direction of the obturator (23) movement, which meatus is to be passed through by possible microleaks in case of losses in the actuator branch (3); a considerable run of the obturator (23) in the presence of microleaks and of consequent pressure losses is thus obtained; a sensor (47) detects the obturator displacements.

대표청구항 ▼

A leak detecting check valve comprising in combination a valve body containing a fluid passage therethrough from an inlet port to an outlet port, a moveable valve member disposed within said fluid passage, a valve seat within said fluid passage engageable by said valve member for closing said fluid

A leak detecting check valve comprising in combination a valve body containing a fluid passage therethrough from an inlet port to an outlet port, a moveable valve member disposed within said fluid passage, a valve seat within said fluid passage engageable by said valve member for closing said fluid passage, said fluid passage and said valve member being constructed to permit travel of said valve member from a first position in engagement with said valve seat to a second position at which said fluid passage is open to a maximum, said fluid passage being further constructed in combination with said valve member to provide restricted opening of said passage over a substantial travel of said valve member from said first position toward said second position, said fluid passage having a circular cylindrical region adjacent said valve seat, and said valve member having a circular cylindrical portion that travels within said cylindrical passage region concentric therewith with a narrow radial clearance therebetween providing said restricted opening of said passage, said cylindrical portion of said valve member having an end for engaging said valve seat and being disposed to travel away from said valve seat towards said second position, sensor means for detecting when said valve member approaches said second position, and spring biasing means coupled to said valve member for urging the latter toward said valve seat, whereby leaks in any fluid circuit coupled to said outlet port which leaks exceed the flow capacity through said restricted opening will cause said valve member to move toward said second position and activate said sensor means.