RE: Perry Pumps and regulators
Sport Pilot,
Rangability wasn’t accepted by the spelling checker, all other arguing is by using different terms for all we know I see.
Pump
The throttle range of you, we call the range of flow, demand by the glow engine within your pump has to work properly and for that the pump has its limitation in high RPM value’s. (for ducted fan for example). The pump has an adjustable outlet pressure and a limited flow range.
Disadvantage is the difference in outlet pressure, your 0,1 psi. We call that the error (unwanted!), depending of load. When you cannot accept this error you have to choice another pomp (VP20, VP30) or brand.
Controller
The pressure controller does not have a throttle range, because there simple is nothing to throttle only reduce.
The controller has a fixed pressure setpoint , pre adjust by the designer and builder and you normally cannot change that.
We engineers can difine and change this setpoint by changing internal parts.
You can measure a delta outlet pressure between minimum and maximum flow demand by the engine (load?). This we call a “error”, the error of the proportional pressure control loop. This error (in Dutch “proportionele fout”) is mainly depending of the gain of the controller.
The error, usable flow range, minimum needed inlet pressure etc of the controllersystem is depending of the quality and design of the controller and other parts of the system.
Cees