Excess pressure release for gas

• US 6,792,972 B2
• Filed: 08/02/2002
• Issued: 09/21/2004
• Est. Priority Date: 02/04/2000
• Status: Expired due to Fees

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Korsnas Bates A/S (Industriförvaltnings AB Kinnevik)
• Inventors: Poulsen, Mogens
• Primary Examiner(s): Hepperle, Stephen M.
• Application Number:
  US10/182,803
• Publication Number:
  US 20030010384A1
• Time in Patent Office: 781 Days
• Field of Search: 137/484.2, 137/484.4, 137/484.6
• US Class Current: 137/484.4
• CPC Class Codes: F16K 17/046 the valve being of the gate valve type or the sliding valve type
• CPC Class Codes: Y10T 137/7754 Line flow effect assisted
• CPC Class Codes: Y10T 137/7755 Reactor surface normal to flow
• CPC Class Codes: Y10T 137/7756 Reactor surface separated from flow by apertured partition

Abstract

An excess pressure release is provided which at injector effect during inflation of an air cushion ensures an under-pressure in a part (23) of a valve chamber. By activating a piston (19), the underpressure retains the excess pressure release in its open position against the force of a spring (11), until a desired counter pressure from the filled air cushion stops the injector effect, whereby the excess pressure release is closed. As a result the air cushion may be inflated at a comparative high pressure and thus in a fast manner. The inflation is stopped automatically and securely, when the desired pressure has been reached in the air cushion.

Claims

1. Excess pressure release for gas comprising a valve housing (1) having an inlet port (2) with an inlet valve seat (3), an outlet port (4), and a valve chamber (22,23) between said ports (2,4), said valve housing (1) further comprising

a valve body (5) displaceably arranged therein and provided with an inlet end (6), the periphery of which being slidably arranged in a snugly fitting opening (8) in a wall (9) of the valve housing (1) between the inlet port (2) and the valve chamber (22,23) and sealed against the valve chamber (22,23), the outer end (12) thereof facing the inlet valve seat (3) remaining closed towards the inlet valve seat (3) by means of a biassing means acting on the valve body (5), until the gas pressure at the inlet port (2) exceeds a predetermined gas pressure urging the valve body (5) into an open position and said valve body (5) comprising an outlet end (16) ending in the outlet port (4) and having an outlet passage (17) communicating with one or several openings (18) in the periphery (7) of the inlet end (6) for allowing the gas pressure access in the open position of the inlet end (6), characterised in that a piston means (19) connected with the valve body (5) divides the valve chamber into two parts (22 and 23) in an air-tight manner, the first part (22) thereof facing the inlet port (2) and the second part (23) facing the outlet port (4), wherein the second part (23) of the valve chamber facing the outlet port (4) encloses the outlet end (16) of the valve body (5) and communicates with the outlet port (4) through at least one opening, while the first part (22) of the valve chamber communicates with the surroundings.

2. Excess pressure release according to claim 1, characterised in that the opening between the second part (23) of the valve chamber and the outlet port (4) is obtained by providing the outlet end (16) of the valve body (5) with a conical shape as an injector nozzle, said outlet end jointly with the valve housing (1) forming an annular access opening (25) between the valve housing (1) and the outlet end (16) of the valve body (5).

3. Excess pressure release according to claim 1 or 2, characterised in that it comprises mechanical means for urging the piston means (19) into its open position.

4. Excess pressure release according to claim 3, characterised in that the mechanical means comprise a ring (30) arranged axially displaceable around the inlet port (2) on the valve housing (1) and provided with bars (31) going through the wall (9) of the valve housing and made to abut the piston means (19) against the force of pressure springs (32).