DOUBLE DISC SEAL VALVE

• US 3,842,861 A
• Filed: 09/27/1973
• Issued: 10/22/1974
• Est. Priority Date: 09/27/1973
• Status: Expired due to Term

• Current Assignee: Frank J. Jandrasi, Howard A. Purvis
• Original Assignee: Frank J. Jandrasi, Howard A. Purvis
• Inventors: Purvis, Howard A., Jandrasi, Frank J.
• Primary Examiner(s): Weakley, Harold W.
• Application Number:
  US05/401,508
• Time in Patent Office: 390 Days
• Field of Search: 137/613,628,637 251/172,298,302
• US Class Current: 137/628
• CPC Class Codes: F16K 3/10 with special arrangements for separating the sealing faces or for pressing them together
• CPC Class Codes: F16K 3/16 with special arrangements for separating the sealing faces or for pressing them together F16K3/10, F16K3/14 take precedence
• CPC Class Codes: Y10T 137/86928 Sequentially progressive opening or closing of plural valves
• CPC Class Codes: Y10T 137/87096 Valves with separate, correlated, actuators
• CPC Class Codes: Y10T 137/87917 Flow path with serial valves and/or closures

Abstract

A double disc seal valve provided with two independently operable disc valves, a double bellows pressure sealing system sealing each disc valve protected from the erosive action of solids or entrained solids flow, and an interdisc chamber that is pressurized to form an aerodynamic or hydrodynamic seal to provide additional seal of high pressure, high temperature, erosive solid or fluid flow systems. A control system is provided which sequences the operation of the disc valves, pressurization of the bellows system and pressurization of the interdisc chamber on closing, and releases the pressure from the bellows system and interdisc chamber and then opens the disc valves upon opening the valve.

Claims

1. A valve comprising, a body having a flow passage extending therethrough, a pair of disc valves arranged for movement to close and open the flow passage, said disc valves being spaced apart from one another in the direction of flow in the flow passage thereby providing an intermediate pressure chamber between the discs when the discs are in closed position, means for opening and closing the disc valves, pressure-sealing means to seal the disc valves relative to the flow passage when the discs are in closed position, and means for providing pressure to the pressure-sealing means and to the intermediate pressure chamber.

2. The invention of claim 1 where, the pressure-sealing means comprises an annular pressure-expansible sealing member on each side of each of the disc valves adjacent to and out of the path of flow in the flow passage, and annular housing means confining each of the pressure-expansible sealing member adjacent to and out of the path of flow in the flow passage.

3. The invention of claim 2 where, one each of the annular housings and annular pressure-expansible sealing members are carried by one each of the discs, the upstream surface of the carried housing means comprises a valve seating surface for the other of the annular sealing means, and an annular valve seating surface sealingly engageable by the disc-carried annular sealing ring.

4. The invention of claim 1 where, the means for opening and closing the disc valve are independently operable.

5. The invention of claim 1 where, the means for opening and closing the disc valves and for providing pressure to the pressure-sealing means in the intermediate pressure chamber comprise means to actuate the upstream disc valve to closed position, means responsive to closing the upstream disc valve providing pressure to the pressure-sealing means sealing the upstream valve disc and actuating the downstream disc valve to closed position, and means responsive to closing the downstream disc valve providing pressure to the pressure-sealing means sealing the downstream disc valve and to the intermediate chamber formed by the closing of the upstream disc valve and the downstream disc valve.