초록 ▼

A pig trap closure is disclosed which includes a collar adapted to be attached to the end of a pipe, a door for opening and closing the end of the pipe, means for clamping the door to the collar and sealing means for preventing communication between the interior of the pipe and the atmosphere when t

A pig trap closure is disclosed which includes a collar adapted to be attached to the end of a pipe, a door for opening and closing the end of the pipe, means for clamping the door to the collar and sealing means for preventing communication between the interior of the pipe and the atmosphere when the door is clamped to the collar. A testing valve is provided for indicating the presence of pressurized fluid in the pipe and means connects the testing valve to a handle used to unclamp the door for preventing movement of the handle until after the presence of pressurized fluid within the pipe has been checked by the testing valve.

대표청구항 ▼

A pig trap closure, comprising: a collar adapted to be attached to the end of a pipe which is to receive a pig; a door pivotally connected to the collar for opening and closing the end of the pipe; means for clamping the door to the collar including semicircular sections forming a clamping ring arou

A pig trap closure, comprising: a collar adapted to be attached to the end of a pipe which is to receive a pig; a door pivotally connected to the collar for opening and closing the end of the pipe; means for clamping the door to the collar including semicircular sections forming a clamping ring around the pipe, lips being provided on the inner surface of the ring for engaging with portions on the door and collar, one end of the sections being hinged together and the other ends being movable together for clamping the door to the collar when the lips engage the portions on the door and collar and apart for unclamping the door from the collar; a latching mechanism for moving the other ends together and apart including a mechanical linkage pivotally connected to each of these ends and a handle attached to the linkage for controlling movement of these ends between opened and closed positions; fluid energized sealing means provided on the collar for preventing communication between the interior of the pipe and the atmosphere when the door is clamped to the collar; a testing valve for indicating the presence of pressurized fluid in the pipe including a housing connected to the collar having an inlet passage in communication with the interior of the pipe, an outlet passage in communication with the inlet passage and the atmosphere, a seat within the housing intermediate of the inlet and outlet passages, a ball disposed within the housing for engaging with the seat to prevent communication between the inlet and outlet passages, and a stem assembly for urging the ball toward the seat having a push rod extending into the housing for contacting the ball and threads for engaging mating threads on the housing to move the push rod toward and away from the seat, the presence of pressurized fluid being indicated by fluid flowing through the housing into the atmosphere when the push rod is moved away from the seat; and means connecting the testing valve to the handle for preventing movement of the handle to open the door until after the push rod is moved away from the seat and the stem assembly removed from the housing to test for the presence of pressurized fluid within the pipe.