Robert A Sheldon

US Patent:

41802403, Dec 25, 1979

Filed:

Dec 16, 1977

Appl. No.:

5/861266

Inventors:

Robert S. Sheldon - Northridge CA
Jan W. Rabek - Northridge CA

Assignee:

Air-Dry Corporation of America - Northridge CA

International Classification:

F16K 4702
F16K 2500

US Classification:

251127

Abstract:

A low noise level valve for controlling high pressure fluid flow between an inlet and an outlet. The valve comprises a poppet movable along a given line with respect to a complementarily formed valve seat. The area between the poppet and valve seat comprises a series of spaced undulations which extend along a continuous curve of approximately 90. degree. The undulations are disposed substantially parallel to the direction of poppet movement adjacent to the inlet and are substantially transverse adjacent to the outlet. The undulations define a plurality of orifices which are opened progressively from the outlet toward the inlet. The orifices act as pressure drops and also cause turbulence as fluid flows around the undulations, thereby holding the fluid flow below undesirable speed and noise levels. A balancing chamber may be provided to counter-balance the poppet movement. Sealing means may be provided by an undercut lip formed on a sealing member adjacent to the inlet.

US Patent:

41799178, Dec 25, 1979

Filed:

Dec 16, 1977

Appl. No.:

5/861267

Inventors:

Robert S. Sheldon - Northridge CA
Jan W. Rabek - Northridge CA

Assignee:

Air-Dry Corporation of America - Northridge CA

International Classification:

G01N 2568

US Classification:

73 17A

Abstract:

A low pressure dew and frost point indicator of the type having a vortex tube which directs a cold air stream against the back of a viewing mirror for observation of the initial formation of frost. The mirror has means for simple and automatic centering with respect to the cold air stream of the vortex tube for maximum temperature transfer. The mirror engages no heat conducting elements and has means for improved cold temperature transfer. A venturi nozzle passes the warm air output of the vortex tube around the cold air output for adjustment to provide optimum cold air generation by reduction of the vortex tube outlet pressure. A temperature control valve controls the temperature in the sample chamber by mixing the warm and cold air outputs of the vortex tube.

US Patent:

39585999, May 25, 1976

Filed:

Aug 29, 1974

Appl. No.:

5/501785

Inventors:

Robert S. Sheldon - Northridge CA
David E. Whitten - Northridge CA

Assignee:

Air-Dry Corporation - Northridge CA

International Classification:

F16K 1110

US Classification:

137613

Abstract:

A remote sensing regulator and shutoff valve for valve manifold applications. The manifold includes a pressure regulator and a shutoff valve downstream from the regulator. The sensing pressure input of the regulator is connected to a negative pressure area of the shutoff valve so that the output pressure of the regulator is increased to compensate for pressure drops both upstream and downstream from the shutoff valve. The shutoff valve includes a control knob for adjusting the reference pressure and for shutting off the reference pressure simultaneously with shutting off the main stream through the shutoff valve.