Date of Award

Spring 1984

Document Type

Thesis

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Ping Toheng

Committee Member

Robert L. Ash

Committee Member

A. Sidney Roberts

Call Number for Print

Special Collections; LD4331.E56W31

Abstract

The development of a proportional fluid control valve/assembly is presented. This electro-mechanical system is needed for space applications to replace the current proportional flow controllers that use bulky hydraulic or pneumatic actuation systems. The flow is controlled by a microprocessor system that monitors the control parameters of upstream pressure and requested volumetric flow rate. The microprocessor achieves the ·proper valve stem displacement by means of a digital linear actuator. A linear displacement sensor is used to measure the valve stem position. 'Ibis displacement is monitored by the microprocessor system as a feedback signal to close the control loop. With an upstream pressure between 15-47 psig, the developed system operates between 779 standard cm3/sec (SCCS) and 1543 secs. The delivered volumetric flow rates were within 5% of the requested values. Recommendations made for future work on the design include further modification to the bellows spring and the possibility of a mass flow rate controller.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/w004-qn63

Download

Share

COinS