Abstract: The beam of an amplifier beam transducer is maintained on a support edge of a fulcrum for pivotal movement thereabout yet restrained against other movement by a U-shaped yoke which cooperates with means disposed near opposite ends of the beam forming a pair of parallel axes about which the beam pivots. A fulcrum adjusting screw positions the support edge of a fulcrum lengthwise in the beam chamber varying the beam lengths on opposite sides of the support edge. A single load input cell or pair of differentially acting load input cells are threadably received in an opening on the housing and exert a force on one end of the beam tending to pivot the beam about the support edge of the fulcrum. An output cell, also threadably received in an opening on the housing, contacts the opposite end of the beam and produces an output signal in response to deviations of the input end of the beam.

Abstract: A constant flow valve for low flow rates employs a tire valve assembly which is threadably received within the downstream end portion of an axial passageway formed in an elongated inlet tube. The tube is received within a stem portion of a first part of an internal housing. A movable wall which is at its periphery clamped between a base portion of such first part and a bell portion of the second part, divides the interior of said housing into upstream and downstream chambers. The stem portion of the tire valve assembly extends into the upstream chamber and contacts the movable wall. A biasing spring is located in the downstream chamber and exerts a biasing force against the movable wall which is in turn transmitted to the control stem. A considerable length of relatively small internal diameter, high flow resistance tubing is coiled about the inlet tube and the stem portion of the first housing part.