Abstract: A flow totalizer apparatus for totalizing the volume of fluid flowing through the inventive apparatus. The apparatus includes a cylinder having a first cylinder port at one end and a second cylinder port at an opposite end, a piston slidably mounted within the cylinder, a bistable spring mechanism, a directional control valve and a counter. The bistable spring mechanism has a motion axis with two stable positions therealong and includes a drive pin, a piston slotted bar and a spool slotted bar, both slotted bars slidably connected to the drive pin and aligned with the motion axis. The total volume is estimated by cylinder volume times the number of stable-position changes of the bistable spring mechanism.

Abstract: A flow rate of a fluid flowing in a tubing is determined using a flow meter. The flow meter measures a value related to the flow rate. The tubing has a valve for controlling the fluid flowing through the flow meter. The method of determination of the flow rate includes closing the valve and measuring a first zero flow rate value at a first time and a second zero flow rate value at a second time, estimating an error of the value measurement based on the first and second zero flow rate values, opening the valve and measuring value of the flowing fluid, applying an error correction to the measured value of the flowing fluid, and calculating a corrected flow rate based on the corrected value of flowing fluid.

Abstract: A fluid injection system controls the distribution of fluid from a supply line to a selected well at an adjustable rate. A fluid barrier divides a cylinder into first and second chambers. A multi-position valve comprises a first position for passing fluid from the supply line into the first chamber to displace fluid from the second chamber back through the valve to an injection point, and a second position for passing fluid from the supply line to the second chamber to displace fluid from the first chamber back through the valve to the injection point. A control system in communication with a position sensor times displacement of the fluid barrier to selected positions, and selectively adjusts a variable valve opening to adjust flow rate, switch between the first and second positions, and periodically increase the valve opening for cleaning.

Abstract: The invention relates to a flow meter and in particular to a flow meter suitable for connection into a fluid conduit. The flow meter has an inlet and an outlet for connection into a fluid line and includes interconnected cylinders, each cylinder having a plurality of ports controlled by a piston axially-movable therein such that at any time the inlet and outlet are in fluid communication by a fluid pathway which includes two cylinders characterized in that there are three interconnected cylinders.

Abstract: Apparatus 1 for monitoring flow of fluid, such as domestic water, along a conduit 2 comprising a piston and cylinder arrangement 3 having a plurality of free pistons 4 and 5, and port means 6 which are so arranged with respect to the pistons 4 and 5 that an inlet port is always open during strokes of each piston 4 or 5 so that fluid flow is continuous along the conduit 2.

Abstract: A fluid flow sensor comprises a housing having a fluid inlet and a fluid outlet, a measuring chamber in the housing connected at opposite ends to both the fluid inlet and the fluid outlet, a member in the chamber movable between opposite ends of the chamber, and a valve assembly for controlling fluid flow through the housing. The valve assembly is movable between a first position in which it cuts off one end of the chamber from the outlet so that fluid in that end of the chamber acts on the movable member to urge it to the other end of the chamber, and a second position in which it cuts off the other end of the chamber from the outlet so that the member is urged back in the opposite direction. The member oscillates back and forth at a rate proportional to the flow rate.

Abstract: A fluid flow sensor comprises a housing having a fluid inlet and a fluid outlet, a measuring chamber in the housing connected at opposite ends to both the fluid inlet and the fluid outlet, a member in the chamber movable between opposite ends of the chamber, and a valve assembly for controlling fluid flow through the housing. The valve assembly is movable between a first position in which it cuts off one end of the chamber from the outlet so that fluid in that end of the chamber acts on the movable member to urge it to the other end of the chamber, and a second position in which it cuts off the other end of the chamber from the outlet so that the member is urged back in the opposite direction. The member oscillates back and forth at a rate proportional to the flow rate.

Abstract: A fluid flow sensor comprises a housing having a fluid inlet and a fluid outlet, a measuring chamber in the housing connected at opposite ends to both the fluid inlet and the fluid outlet, a member in the chamber movable between opposite ends of the chamber, and a valve assembly for controlling fluid flow through the housing. The valve assembly is movable between a first position in which it cuts off one end of the chamber from the outlet so that fluid in that end of the chamber acts on the movable member to urge it to the other end of the chamber, and a second position in which it cuts off the other end of the chamber from the outlet so that the member is urged back in the opposite direction. The member oscillates back and forth at a rate proportional to the flow rate.

Abstract: A flowmeter for measuring the throughput of a liquid from a source to a load, especially for gasoline, diesel oil, heating oil and the like, comprises at least two measuring cylinders having floating pistons and respective reversing elements which have two positions in which the reversing elements can be temporarily retained. A first reversing element is controlled by the first measuring cylinder and controls the reversal of flow of the liquid to the second measuring cylinder and vice versa. Means is provided for counting the strokes of each of the floating pistons to signal the quantity of displaced liquid.

Abstract: A liquid flow meter comprises a housing having a cylindrical piston chamber and a control chamber. A measuring piston is movable in the piston chamber and a flow control slider is movable in the control chamber and it has respective oppositely directed control surfaces which are made effective, by the flow of liquid between the inlet to the housing and a communication between the measuring piston chamber and the control chamber to move the control slider in a control direction. At each end position of the slider, there is a magnetic holding device for holding the slider until a predetermined control pressure is brought to bear against it to move it in an opposite direction. At each limit of its movement, the piston engages and charges an energy or power storage device operable to accelerate its movement in the opposite direction. The control movements of the slider for regulating the flow between the inlet and the outlet are varied in accordance with the position of the measuring piston.