Hitachi Global Air Power Us, LLC

Jonathan D Batdorff

Hideki Fujimoto

Christian Vaughn

Edward Noble

Don Weinkauf

A screw compressor and a variable capacity bypass valve therefor are provided. The variable capacity bypass valve includes a bore formed in a rotor bore discharge face of the compressor housing upstream of a compression chamber outlet end of the compression chamber, a slide valve member inserted into the bore to fill a cavity, the valve member having a sealing surface configured to interact with a thread of a compressor screw during operation of the screw compressor, an actuator structure coupled to the valve member and oriented to move the valve member radially along the bore to open a fluid pathway communicatively coupling the compressor chamber to a bypass chamber configured to return compressed fluid to a fluid inlet of the compression chamber.

Variable capacity bypass valve for screw compressor

A screw compressor and a compact variable volume index valve therefore are provided. The compact variable volume index valve includes a linear valve member positioned adjacent a compression chamber outlet end of a compression chamber of the screw compressor, an actuator structure coupled to the liner valve member and oriented to move the linear valve member radially along the compression: chamber outlet end of the compression chamber to adjust a radial location where gas exits the compression chamber, wherein the actuator structure is coupled to a shutter of a spiral valve of the screw compressor such that the actuator structure moves the liner valve based on a position of the spiral valve of the screw compressor.

Compact variable volume index valve for screw compressor background

A spiral valve and a screw compressor having a compressor housing and the spiral valve are provided. The spiral valve includes an actuator module having an electric motor and a gearbox mechanically coupled to the electric motor to transmit a torque from the electric motor, and a spiral valve body coupled to the gearbox to rotate in response to the transmitted torque from the electric motor. The spiral valve body has a first shutter positioned to open and close one or more of a plurality of bypass ports formed in the compressor housing based on a rotational position of the second shutter, a second shutter positioned to progressively open and close a compressor inlet transfer duct formed in the compressor housing based on a rotation position of second shutter, and a gap formed between the first and second shutters.

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Michigan City, IN, United States of America

Jonathan D Batdorff