VERSATILE FLOW RATE CONTROLLER

摘要

A versatile flow rate controller comprises an orifice (8) exchangeable depending on the required opening for a different fluid and a different flow rate range, a control valve (2) on the upstream side, a pressure detector (6) between the control valve (2) and the orifice (8), an arithmetic circuit (14) for calculating a flow rate as Qc=KP1 (K is a constant) from an upstream pressure P1 detected by the detector (6); an output circuit (16) for providing a flow-setting signal Qe, a converter circuit (18) for producing a flow rate signal Qf (Qf=kQc) by multiplying the calculated flow rate signal Qc by a factor k to change the full-scale flow rate, and a control circuit (20) for supplying a driver section (4) of the control valve (2) with a control signal Qy corresponding to the difference between the Qf and Qe.