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Back-to-back valve gate system

  • US 5,478,230 A
  • Filed: 04/13/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 04/13/1994
  • Status: Expired due to Term
First Claim
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1. In combination,a housing,first means for providing a flow of fluid into the housing for a flow of the fluid through the housing,first passages communicating with the first means,pairs of second passages, each pair being in communication with an individual one of the first passages,second means for heating the fluid as the fluid flows through the passages in the housing,pistons movable in the housing, first ones of the pistons being movable in first and second opposite directions in the housing and second ones of the pistons being respectively movable in the housing in the second and first opposite directions simultaneously with the movements of the first pistons in the first and second opposite directions,third means associated with the pistons for applying a pneumatic pressure to the pistons to move the first ones of the pistons in the first and second opposite directions and to move the second ones of the pistons respectively in the second and first opposite directions simultaneously with the movements of the first ones of the pistons in the first and second opposite directions, andfourth means associated with the pistons and having first and second operative relationships with the movements of the pistons in the first and second opposite directions and operative in the first relationship to provide for the flow of the heated fluid through the first passages and the second passages in the housing and operative in the second relationship to prevent the flow of the fluid through the passages in the housing and responsive to the pressure of the pneumatic fluid from the third means for providing a change in the disposition of the pistons between the first and second relationships.

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