Back to results
US 5,174,497 AGranted
Cryogenic pilot valve
AssigneePraxair Technology, Inc.
InventorNorman H. White
Life of this patent
Estimating the term…
Abstract
A cryogenic pilot valve comprising a thermal sensing element of two disparate thermal expansion materials on an actuator body joined to a control fixture having an integral valve wherein the actuator body and the control fixture are rigidly joined by loaded threads which simultaneously serve as the calibration set point device.
Claims4
A cryogenic pilot valve having an actuator body and a controlled component holding fixture characterized by:
- (A) said actuator body comprising:
- (1) a metallic sensing tube having a free end;
- and
- (2) a low thermal expansion element within the metallic sensing tube, attached by welding or brazing at one end to the free end of the sensing tube and having an actuator at the other end;
- (B) said controlled component holding fixture comprising:
- (3) loaded calibration threads for screwing the controlled component holding fixture into the actuator body to form a rigid joint, said calibration threads loaded by at least one concave shaped washer whose concave profile is flattened in proportion to an applied axial load;
- (4) a valve seat having an aperture;
- and
- (5) a spring loaded spherical valve plug for contacting the actuator through the valve seat aperture;
- and
- (C) inlet and outlet valve ports within the actuator body and controlled component holding fixture.
8 more elements
Dependencies are inferred from the claim text.