Dunan Microstaq, Inc.

Jennifer O'Keefe

Chen Yang

Parthiban Arunasalam

Joe Albert Ojeda, Sr

E Nelson Fuller

Gengxun Kara Gurley

Arvind Rao

Buu C Chung

A spool assembly configured for use in a two-stage proportional control valve in a fluid system includes a substantially cylindrical sleeve having an axially extending sleeve bore extending from an open first end to an open second end. A spool includes a spool bore that extends from an open first axial end to a closed second axial end and is slidably mounted within the sleeve bore. The spool further includes a first circumferentially extending groove defining a fluid flow path, a second circumferentially extending groove formed near a first end thereof, a third circumferentially extending groove formed near the second axial end thereof, a circumferentially extending pressure groove formed therein between the second axial end and the third circumferentially extending groove, and first, second, and third transverse fluid passageways formed through a side wall of the spool.

Expansion valve

A test equipment arrangement includes a superheat controller configured for connection to a unit under test, and further configured to test at least one operational parameter of the unit under test.

Test equipment arrangement having a superheat controller

A two-stage proportional control valve configured for use in a fluid system includes a valve body having a longitudinally extending valve body bore formed therethrough. A first stage microvalve is mounted within the valve body bore, and a second stage spool assembly is mounted within the valve body bore downstream of the microvalve. The second stage spool assembly includes a sleeve and a spool slidably mounted within the sleeve.

Growing community of inventors

Austin, TX, United States of America

Jennifer O'Keefe