Sumitomo Heavy Industries, Ltd.

Sumitomo (shi) Cryogenics of America, Inc.

Sumitomo (shi) Cryogenic of America, Inc.

Sumitomo Cryogenics of America, Inc.

Eric Robert Seitz

Ralph C Longsworth

Mingyao Xu

Jin Lin Gao

Stephen Dunn

Motokazu Saito

This invention relates to oil lubricated helium compressor units for use in cryogenic refrigeration systems, operating on the Gifford McMahon (GM) or Brayton cycle. The objective of this invention is to provide redundancy by having a water cooled compressor manifolded to an air cooled compressor and sensors to detect faults so that an expander can be kept running if there is a failure in either the water or air supply.

Dual helium compressors

A rotary valve unit which reduces the torque required to turn the valve disc, and the amount of wear dust that is blown into the cold head, using differential gas forces to keep the valve disc in contact with the valve seat, and which enables larger diameter valve discs to be utilized for multi-ported pulse tubes that have less force on the face of the valve disc, resulting in reduced torque and reduced wear rate.

Reduced torque valve for cryogenic refrigerator

An improved method of reducing wear dust and torque required to turn a multi-port rotary disc valve utilizes a thrust bearing to hold the valve seat and/or valve disc such that they are not in contact with each other, or have light contact each other.

Wearless valve for cryorefrigerator

Growing community of inventors

Macungie, PA, United States of America

Eric Robert Seitz