James D Tuttle

US Patent:

61095915, Aug 29, 2000

Filed:

Oct 25, 1996

Appl. No.:

8/738016

Inventors:

James D. Tuttle - Houston TX
Robert J. Schwartz - Houston TX

International Classification:

F16K 152

US Classification:

251208

Abstract:

A continuous flow type proportional flow control valve having a very wide controllable flow range and having a valve seat port design permitting a continuous, stable closed loop control to be achieved. The flow port design cooperates with a simple cylindrical flow passage of a movable valve element and provides the valve with a very wide flow control range and the ability to smoothly control the opening, modulation, and closing of the valve to eliminate undesirable hydraulic shock which is an undesirable characteristic of pulse operated flow control systems. The flow controlling seat has a flow controlling port therein that cooperates with the flow port of the closure to define an effective valve opening that is proportionally variable over a wide range of closure movement. The seat port is provided with an extremely narrow elongate slot section less than 1/50th of the maximum width of the aperture. The seat opening also defines a large final, generally circular orifice section having a radius comparable to the radius of the bore in the ball.

US Patent:

47499303, Jun 7, 1988

Filed:

Oct 22, 1986

Appl. No.:

6/921726

Inventors:

Paul E. Faville - Renton WA
James D. Tuttle - Houston TX

Assignee:

The Boeing Company - Seattle WA

International Classification:

H02P 800

US Classification:

318696

Abstract:

A high speed positive feed drill motor open loop control system. The motor system comprises a minimally limited inertia air turbine motor including mounting guidance and control for enabling the drill to advance into the workpiece at a rate exactly proportional to the rotational speed of the drill. The turbine speed is measured with a digital tachometer while a stepper motor/ball screw mechanism is utilized to control and apply the feed rate.