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A choke valve with a power system operated via a single hydraulic line. The sleeve of the choke valve is operated by a carrier mounted through an eccentric pin and guide track arrangement to open and close the valve with the rotation of a valve drive shaft. A power shaft is driven by a clutch plate,

A choke valve with a power system operated via a single hydraulic line. The sleeve of the choke valve is operated by a carrier mounted through an eccentric pin and guide track arrangement to open and close the valve with the rotation of a valve drive shaft. A power shaft is driven by a clutch plate, ratchet connected to a drive clutch plate, in turn, operated by the shaft of an hydraulic actuator. The valve actuator creates an incremental step sensing of its full sixteenth turn movement by closing a fluid exhaust port and causing back pressure in the hydraulic line to occur. The actuator is reset by a pre-loaded torsion bar. Reset of the actuator also ratchet resets the drive clutch plate.

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Apparatus for determining fluid flow rate, comprising a choke valve, including a cylinder with an axial exit opening and a plurality of entrance side flow ports, a sleeve moving concentrically over said cylinder to determine the amount of entrance opening provided by said side flow ports, said sleev

Apparatus for determining fluid flow rate, comprising a choke valve, including a cylinder with an axial exit opening and a plurality of entrance side flow ports, a sleeve moving concentrically over said cylinder to determine the amount of entrance opening provided by said side flow ports, said sleeve including side keying means, a back-and-forth carrier operating with said sleeve side keying means for causing said sleeve to progress from opening to closing and back to opening of said side flow ports with the travel of said carrier, said carrier including eccentric drive keying means, said carrier including a recess for accommodating said sleeve side keying means, said sleeve side keying means being a projection for riding in said recess in said carrier, a rotatable drive shaft at right angles to said cylinder and sleeve including compatible means for operating with said carrier drive keying means, and power means connected for rotating said rotatable valve drive shaft including a dynamic fluid actuator connected to receive actuation pulses from a single fluid input line, wherein a pulse input causes an incremental change in fluid flow through said choke valve.