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A method for installing an adjustable flow restricting valve member in a tubular pipe, and a valve device for utilization of the method, including the steps of cutting a slot extending in the longitudinal direction of the tubular pipe, inserting a mainly plane valve member through said slot, said va

A method for installing an adjustable flow restricting valve member in a tubular pipe, and a valve device for utilization of the method, including the steps of cutting a slot extending in the longitudinal direction of the tubular pipe, inserting a mainly plane valve member through said slot, said valve member being arranged with a stem extending through the slot and facilitating a rotary movement of the valve member from a position corresponding with the length axis of the tubular pipe to a position in contact with the internal wall surface of the tubular pipe, said stem also extending through a member arranged to prevent communication between a medium within the pipe and the outside atmosphere.

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A method of installing an adjustable flow restricting valve in a tubular pipe, comprising, cutting an elongated slot having major and minor axes through the pipe, the major axis extending parallel to the longitudinal axis of the pipe, providing a valve member having a flat face and a peripheral surf

A method of installing an adjustable flow restricting valve in a tubular pipe, comprising, cutting an elongated slot having major and minor axes through the pipe, the major axis extending parallel to the longitudinal axis of the pipe, providing a valve member having a flat face and a peripheral surface configuration corresponding to the interior of said pipe, providing an elongated stem on said valve member, aligning said valve member with said slot with the flat face parallel to said major axis, inserting said valve member through said slot to a position surrounded by said pipe, with said stem extending through said slot to facilitate a rotary movement of said valve member between a position in contact throughout substantially its entire peripheral surface with the internal peripheral wall surface of said pipe, thus preventing a media flow therethrough, to desired adjustable positions in relation to the length axis of the pipe thus restricting a media flow to a desired extent through the pipe and sealing the area between said slot and said stem. An adjustable flow restricting rotary valve for use with a tubular pipe conducting a fluid, comprising at least two housing members connected together to form a unitary housing body completely enclosing a length section of said pipe, means for connecting said housing members together, each of said housing members having a groove in the surface which faces another housing member, said grooves having a configuration conforming to the exterior configuration of said pipe to form a tubular bore which closely embraces said pipe section, a valve member positioned in one of said grooves in one of said housing members, a valve stem extending through said one of said housing members in rotatable relationship therewith and being connected at its inner end to said valve member, said valve member being substantially flat and having a peripheral surface configuration conforming to the inner peripheral configuration of said pipe so that said valve may be rotated by said stem into varying flow restricting positions in said tubular pipe, said valve member being in contact throughout substantially its entire peripheral surface with said inner peripheral configuration of said pipe when in closed position, an elongted slot in said pipe slightly larger than and having a configuration conforming to the largest cross-section of said valve member, the longer dimension of said slot being parallel with the longitudinal axis of said pipe, so that when assembled said valve member is insertable through said slot and positioned within said pipe, and means to seal said slot.