Abstract: A constant flow valve includes a valve body having an inlet portion, an outlet portion and a main valve body portion, the inlet portion and the outlet portion being connectable within the run of a fluid pipe line. The main valve body portion is interposed between the inlet portion and the outlet portion and has an open end, a cap member on the open end, and valve means disposed in the main valve body portion for maintaining a constant flow rate through the valve body means regardless of pressure differential between the inlet portion and the outlet portion.

Abstract: An automatic fluid control valve for maintaining a substantially constant fluid flow rate includes a partition wall within a valve casing between a fluid inlet and a fluid outlet. A restriction adjusting member is mounted movably in the valve casing and includes a tapered end movable relative to a valve port in the partition wall to define a restricted passageway for fluids with the adjacent walls of the valve port. A valve stem is movable within the casing and has a valve thereon cooperable with the valve port to regulate the flow of fluids therethrough in response to changes in fluid pressure differential. A diaphragm is operatively connected to the valve stem and separates a region within the valve casing into a pair of pressure-differential chambers, and a flow passage is formed in the casing communicating one pressure-differential chamber with the inlet chamber, the other pressure-differential chamber communicating with the downstream side of the valve port.

Abstract: A constant-flow fluid regulating valve includes a valve casing having inlet and outlet ports at opposed ends thereof. A spring is mounted coaxially within the casing between the inlet and outlet ports and interiorly of a slide member that is slidable axially within the valve casing. The spring is adapted to bias the slide member towards the inlet port. An orifice plate having a plurality of apertures is carried by the slide member for movement therewith within the valve casing. A guide member is fixedly and coaxially mounted within the valve casing downstream of the slide member. Circumferential surfaces on the guide member and slide member define together an intermediate flow passage through which the fluid passing through the valve must travel before exiting by means of the outlet port.

Abstract: An automatic fluid control valve for maintaining a substantially constant fluid flow includes a valve stem movable linearly within a casing and having valve means thereon cooperable with a valve port to regulate the flow of fluids therethrough in response to changes in fluid pressure differential, diaphragm means operatively connected to the valve stem and separating a region within the valve casing into a pair of pressure-differential chambers, a fluids passageway of variable cross-sectional area settable to establish a predetermined fluid flow rate through the control valve located intermediate the fluid inlet and the outlet and thereby establishing first and second fluid pressures respectively on the upstream and downstream sides of the fluids passageway, and means communicating the fluid pressure on the upstream side of the fluids passageway to one of the pressure differential chambers and the fluid pressure on the downstream side of the fluids passageway to the other of the pressure differential chambers

Abstract: Two pressure-receiving members are provided within a proportional valve interconnecting a main pipe and a bypass line.The ratio of the rate of fluid flow in the main pipe to the rate of fluid flow in the bypass is held constant by moving vertically a valve plug within the proportional valve by the forces developed by the differential pressure placed across each of these two pressure-receiving members and by adjusting the rate of fluid flow in the bypass so as to keep a constant ratio of the pressure differential created across a restriction in the main pipe to the pressure differential created across a restriction in the bypass. Therefore the rate of fluid flow in the main pipe can be determined from a measurement of the rate of fluid flow in the bypass.

Abstract: A constant-flow fluid regulating valve includes a valve casing having inlet and outlet ports at opposed ends thereof. A spring is mounted coaxially within the casing between the inlet and outlet ports and interiorly of a slide member that is slidable axially within the valve casing. The spring is adapted to bias the slide member towards the inlet port. An orifice plate having a plurality of apertures is carried by the slide member for movement therewith within the valve casing. A guide member is fixedly and coaxially mounted within the valve casing downstream of the slide member. Circumferential surfaces on the guide member and slide member define together an intermediate flow passage through which the fluid passing through the valve must travel before exiting by means of the outlet port.