초록 ▼

A device for visually indicating a position of a check valve disc within the check valve is provided. The indicating device has an exposed element extending outside of the valve body to provide a visual indication of a position of the valve disc, an engaging element, connected to the exposed element

A device for visually indicating a position of a check valve disc within the check valve is provided. The indicating device has an exposed element extending outside of the valve body to provide a visual indication of a position of the valve disc, an engaging element, connected to the exposed element, positioned within the valve body to engage the valve disc, a movable seal member to provide an interface between an interior of the valve body and an exterior of the valve body, with the engaging element and the exposed element being connected to the seal member, and a mechanism to hold the engaging element in contact with the valve disc. An electrical switch may be provided for detecting the position of the exposed element and for transmitting an appropriate signal.

대표청구항 ▼

[ What is claimed is:] [1.] A check valve comprising:a valve body comprising an inlet and an outlet and defining a flow path therebetween, the valve body further comprising a recess for accommodating a hinge disposed transverse to said flow path,said hinge being connected to a disc for pivotal movem

[ What is claimed is:] [1.] A check valve comprising:a valve body comprising an inlet and an outlet and defining a flow path therebetween, the valve body further comprising a recess for accommodating a hinge disposed transverse to said flow path,said hinge being connected to a disc for pivotal movement of said disc between a closed position isolating said outlet from said inlet and an open position providing communication between said inlet and outlet,an indicating device having an exposed element extending outside of said valve body to provide a visual indication of a position of said valve disc, an engaging element, connected to said exposed element, positioned within said valve body to engage the valve disc, a movable seal member to provide an interface between an interior of said valve body and an exterior of said valve body, with said engaging element and said exposed element being connected to said seal member, and a mechanism to hold said engaging element in contact with said valve disc. [12.] A check valve according to claim 1, further comprising an indicator plate mounted to said valve body to provide a reference to compare a position of said exposed element against to determine a position of said valve disc. A check valve according to claim 10, wherein said indicator plate includes visible indicia thereon. A check valve according to claim 1, further including an electrical switch mounted for activation by said exposed element when said disc moves to a predetermined position within said valve body. A check valve according to claim 14, wherein said electrical switch comprises a mechanically operated limit switch. A check valve comprising:a valve body comprising an inlet and an outlet and defining a flow path therebetween, the valve body further comprising a recess for accommodating a hinge disposed transverse to said flow path and a threaded opening through a wall of said body,said hinge being connected to a disc for pivotal movement of said disc between a closed position isolating said outlet from said inlet and an open position providing communication between said inlet and outlet,an indicating device comprising a plug threaded on an exterior surface for threaded engagement with said threaded opening in said valve body, a rod having a first end and a second end, said first end in engagement with said valve disc and said second end extending out of said valve body, a movable seal member comprising a pivotable ball captured in said plug to provide an interface between an interior of said valve body and an exterior of said valve body, said rod extending through and being captured in said ball, and a spring attached at one end to said rod and held at an opposite end stationary to said valve housing to hold said engaging element in contact with said valve disc. A check valve according to claim 15, further including an electrical switch mounted for activation by said second end of said rod when said disc moves to a predetermined position within said valve body. A check valve according to claim 17, wherein said predetermined position is a closed position. A check valve according to claim 16, wherein said plug has a tapered threaded body.