Mechanical Flow Meter Low Flow

MECHANICAL FUNCTION

A fixed tapered needle passing through an orifice in the face of a piston, completely seals the port to port connection when the piston is seated. As flow commences the piston is displaced against a 4 p.s.i. differential spring and moves over the tapered section of the needle thus permitting flow through the orifice. Only the needle taper configuration needs to be changed to accommodate any specified viscosity and maximum flow requirement, thus the full deflection of the unit can be used for all applications.

INDICATION AND READ-OUT Piston movement is mechanically linked to a shaft which is rotated to a degree exactly representing piston displacement and therefore flow through the orifice. The shaft passes out of the unit wall into a switch box where it carries a field adjustable cam to operate up to four microswitches. A pointer on the shaft gives visual indication of flow.

INSTALLATION Accuracy is not affected by position and therefore the unit can be mounted in any plane. Forfine manual control of flow, a needle valve may be fitted to the outlet port, and this in conjunction with the flow read out, provides a simple, accurate means of setting maximum flows through the line.