초록 ▼

A check valve construction is provided which is free of friction imparting elements such as a labyrinth seal or a stuffing box with internal packing having an external mounted counterweight. One embodiment is of the power assist type constructed with convenient means for local daily testing the free

A check valve construction is provided which is free of friction imparting elements such as a labyrinth seal or a stuffing box with internal packing having an external mounted counterweight. One embodiment is of the power assist type constructed with convenient means for local daily testing the free swing portion of the check valve while another embodiment includes a manual test device. The valves may include friction free disc position indicators.

대표청구항 ▼

A check valve comprising: a valve body having an inlet and an outlet; a valve seat in said body and disposed at a first angle with respect to vertical to be upwardly inclined toward said inlet; a shaft rotatably mounted in said body adjacent said valve seat, said shaft having one end thereof extendi

A check valve comprising: a valve body having an inlet and an outlet; a valve seat in said body and disposed at a first angle with respect to vertical to be upwardly inclined toward said inlet; a shaft rotatably mounted in said body adjacent said valve seat, said shaft having one end thereof extending out of said valve body; a valve disc fixedly mounted on another end of said shaft for rotation therewith, said valve disc being located in said valve body to seat on said valve seat to interrupt fluid flow between said inlet and said outlet; a housing mounted on said valve body and receiving therein said shaft one end; fluid passage means fluidly connecting the interior of said valve body with the interior of said housing for draining condensate into said valve body, said fluid passage means including a conduit in which said shaft is located; and a counterweight fixedly mounted on said shaft one end for rotation therewith and located in said housing, said counterweight being mounted on said shaft one end off center of said counterweight by a second angle which is less than said first angle so that when said valve disc is seated against said valve seat said counterweight is in advance of vertical with respect to flow direction through said valve body to provide a closing bias on said valve disc.