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A hybrid butterfly valve has a stationary seat and a valve closure disk which may rotate together with an actuating shaft from the fully open position to a position wherein the disk is aligned with th

Cryogenic liquids may be stored and transported in double-walled Dewar containers having a vacuum between the two walls for insulation purposes. To draw that vacuum, a manually operated valve fitting

A single-ported double seated valve mechanism comprising valve body means having an inlet and outlet communicated by a flow passage and a chamber positioned within said flow passage, a valve bonnet se