Decontamination valve for a jet pipe in a paper or board machine
AssigneeValmet Corporation
InventorsMarkku Lemetyinen, Markku Kyynarainen
Life of this patent
Estimating the term…
Abstract
A decontamination valve for a jet pipe in a paper or board machine, including a disc valve having a closed position and an open position. The disc valve is in the closed position when the jet pipe is in operation and is in the open position when the jet pipe is being cleaned in order to remove cleaning/washing water used in the cleaning process. The disc valve is arranged to close in the same direction in which pressure effective in the jet pipe attempts to shift the valve.
Claims19
In a jet pipe in a paper or board machine having a decontamination valve which has an open position when the jet pipe is cleaned to facilitate the removal of water used to clean the jet pipe and a closed position during operation of the jet pipe, the jet pipe including brushes arranged therein for cleaning an inner face of the jet pipe and nozzles in the jet pipe, a pressurized flow of fluid being passed through the jet pipe during operation of the jet pipe and applying a force in a first direction against said valve, the improvement comprising
- said decontamination valve comprising a disc valve operable between a closed position and an open position, and
- means for moving said disc valve in the first direction into the closed position such that the direction of closure of said disc valve is substantially the same as the direction in which the pressurized flow of fluid applies a force against said disc valve,
- said disc valve moving means constitute means for rotating the brushes to thereby clean the inner faces of the jet pipe and the nozzles in the jet pipe.
In a jet pipe in a paper or board machine including a decontamination valve arranged at an end of the jet pipe, a shaft passing through said valve and an interior of the jet pipe, and brushes arranged on said shaft in an interior of the jet pipe for cleaning inner faces of the jet pipe and nozzles in the jet pipe, a pressurized flow of fluid being passed through the jet pipe during operation thereof and applying a force in a first direction against said decontamination valve, the improvement comprising
- said valve housing having inner walls defining an opening and a wash water chamber adjacent to said opening,
- said decontamination valve comprising a disc valve arranged in said opening of said valve housing to contact said inner walls, said disc valve being mounted on said shaft, and
- said shaft being rotated to cause said disc valve to move in a second direction and separate from said inner walls when the jet pipe is cleaned to facilitate the removal of water used to clean the jet pipe, and said shaft being rotated to cause said disc valve to move in the first direction to contact said inner walls and close said opening of said valve housing such that said disc valve is in a closed position during operation of the jet pipe,
- said valve housing comprising a threading arranged to cooperate with said shaft such that rotation of said shaft relative to said valve housing causes said disc valve connected to said shaft to move relative to said opening of said valve housing and rotation of said brushes to clean the inner faces of the jet pipe and the nozzles in the jet pipe.
In an arrangement in a paper or board machine including a jet pipe having a plurality of nozzle holes through which a pressurized flow of fluid is directed against a paper felt or paper roll during use of said jet pipe to clean the felt or roll, the jet pipe including a decontamination valve arranged at an end of the jet pipe, said decontamination valve having an open position when the jet pipe is cleaned to facilitate the removal of water used to clean the jet pipe and a closed position during operation of the jet pipe, the jet pipe including brushes arranged therein for cleaning inner faces of the jet pipe and nozzles in the jet pipe, the improvement comprising
- said decontamination valve comprising
- a valve housing having inner walls defining an opening through which water is removed from said jet pipe,
- a disc valve positionable in said opening to close said opening, and
- means for closing said opening by moving said disc valve in a first direction into contact with said inner walls such that the direction of closure of said opening of said valve housing by said disc valve is substantially the same as a direction in which the pressurized flow of fluid applies a force against said disc valve.
In a method for cleaning a jet pipe having a decontamination valve arranged at an end of the jet pipe, in which a pressurized flow of fluid is passed during use of the jet pipe to clean a press roll, a press felt, a drying wire or a press nip, the decontamination valve having a valve housing with an aperture therein to facilitate the removal of water from the jet pipe, the jet pipe including brushes arranged therein for cleaning inner faces of the jet pipe and nozzles in the jet pipe, the improvement comprising the steps of:
- moving said disc valve in a first direction into contact with the valve housing to close the aperture of the valve housing such that the direction of closure of said disc valve is substantially the same as the direction in which a pressurized flow of fluid applies a force against said disc valve, and
- coupling brushes on a shaft in the jet pipe to said disc valve such that movement of said disc valve causes movement of the brushes to clean the inner faces of the jet pipe and the nozzles in the jet pipe.
Dependencies are inferred from the claim text.