Backflash interrupter

• US 4,949,748 A
• Filed: 03/02/1989
• Issued: 08/21/1990
• Est. Priority Date: 03/02/1989
• Status: Expired due to Fees

• Current Assignee: Fike Corporation
• Original Assignee: Fike Corporation
• Inventors: Chatrathi, SriKrishna, DeGood, Robert L.
• Primary Examiner(s): Nilson, Robert G.
• Application Number:
  US07/317,768
• Time in Patent Office: 537 Days
• Field of Search: 48/192, 137/115, 137/70, 137/467, 220/89 A
• US Class Current: 137/115.26
• CPC Class Codes: F16K 17/162 of the non reverse-buckling-type F16K17/1633 takes precedence
• CPC Class Codes: F17D 1/20 Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves fluid dynamics F15D; damping pulsations in fluids in pipes in general F16L55/04
• CPC Class Codes: Y10T 137/1782 Frangible element returns pressure responsive valve
• CPC Class Codes: Y10T 137/2642 Sensor rigid with valve
• CPC Class Codes: Y10T 137/7734 Fluid opened valve requiring reset

Abstract

A backflash interrupter device is provided which can be placed in-line in a run of pipe, duct, or the like for preventing a pressure wave and any subsequent flame front traveling along the run from passing beyond the device. The preferred backflash interrupter device includes a chamber base and a vent cap cooperatively defining a transfer chamber with at least two fluid-conducting members coupled therewith with the distal ends thereof configured for coupling with respective terminal ends of portions of the run of pipe, duct, or the like.

Claims

1. An interrupter device for in-line placement in a run of pipe, duct, or the like conducting fluids or fluidized particles for preventing a pressure wave and any subsequent flame front traveling therealong from passing beyond said device into an adjacent portion of said run and equipment and areas connected thereto, said run presenting respective first and second spaced-apart, portions thereof, said device comprising:

chamber structure defining an enclosed fluid transfer chamber and including pressure responsive vent means for opening said chamber for exterior venting upon the occurrence of a predetermined level of pressure therein;

a first fluid-conducting member presenting a first fluid port and coupled with said chamber structure in order to fluidically couple said chamber with said first port;

a second fluid-conducting member presenting a second fluid port and coupled with said chamber structure in order to fluidically couple said chamber with said second port,

said members and chamber structure defining a fluid flow path between said ports by way of said chamber,

said members being coupled with said chamber structure in a non-aligned relationship relative to one another in order to prevent direct in-line fluid flow between said members by way of said chamber; and

respective first and second connecting means for fluidically connecting said first port with the first run portion and said second port with the second run portion respectively in order to place said apparatus in an in-line relationship with the run of pipe, duct, or the like,

said vent means including a dome-shaped vent cap defining at least a portion of said fluid flow path between said ports by way of said chamber.

2. The device as set forth in claim 1, each of said conducting members presenting a tubular configuration and a chamber connection end, said members being coupled with said chamber structure with said respective ends in a concentric relationship thereat.

3. The device as set forth in claim 1, each of said members being coupled with said chamber structure in a spaced-apart, generally parallel relationship in the vicinity of said chamber.

4. The device as set forth in claim 1, said connecting means connecting the respective run portions in an axially aligned relationship.

5. The device as set forth in claim 1, the fluid-conducting run being operable for conducting fluid therein at a pressure less than ambient pressure, said vent means presenting surface structure allowing the differential between ambient pressure and the pressure within the run to hold said vent means in a chamber-enclosing relationship relative to said chamber structure, and allowing a rise in pressure within the run above ambient pressure to open said chamber for said exterior venting.

6. The device as set forth in claim 1, said conducting members presenting respective, adjacent, chamber ends connected with said chamber structure, said vent means being located on an opposed side of said chamber structure from said ends so that upon occurrence of said exterior venting, the pressure wave and any subsequent flame front emanating from one of said ends is vented from said chamber and thereby prevented from entering the other of said ends.

7. An interrupter device for in-line placement in a run of pipe, duct, or the like conducting fluids or fluidized particles for preventing a pressure wave and any subsequent flame front traveling therealong from passing beyond said device into an adjacent portion of said run and equipment and areas connected thereto, said run presenting respective first and second spaced-apart, portions thereof, said device comprising:

chamber structure defining an enclosed fluid transfer chamber and including pressure responsive vent means for opening said chamber for exterior venting upon the occurrence of a predetermined level of pressure therein;

a first fluid-conducting member presenting a first fluid port and coupled with said chamber structure in order to fluidically couple said chamber with said first port;

a second fluid-conducting member presenting a second fluid port and coupled with said chamber structure in order to fluidically couple said chamber with said second port,

said members and chamber structure defining a fluid flow path between said ports by way of said chamber,

said members being coupled with said chamber structure in a non-aligned relationship relative to one another in order to prevent direct in-line fluid flow between said members by way of said chamber; and

respective first and second connecting means for fluidically connecting said first port with the first run portion and said second port with the second run portion respectively in order to place said apparatus in an in-line relationship with the run of pipe, duct, or the like,

said first and second members presenting respective chamber connection ends, said device further including closure means for closing at least one of said ends for blocking fluid communication between the conducting member associated therewith and said chamber in the event of said opening of said chamber by said vent means.

8. The device as set forth in claim 7, said closure means including

a closure flap for fluidically closing said one end,

means shiftably coupling said flap with said device adjacent said one end for shifting of said flap between a closed position in which said flap is in a fluid closing relationship with said one end, and an open position allowing fluid flow communication cation between said chamber and the conducting member associated with said one end,

means biasing said flap toward said closed position, and

releasable flap holding means for releasably holding said flap in said open position when said vent means is in a closed relationship relative to said chamber, and for releasing said flap for biased shifting to said closed position during opening of said chamber.

9. The device as set forth in claim 8, further including closure means for each of said ends.

10. The device as set forth in claim 7,

said vent means including a vent cap,

said device further including hinge means hingedly coupling said cap with said chamber structure for shifting of said cap between open and closed positions,

said closure means including a valve flap coupled with said vent cap and shiftable therewith for closing said one end when said cap is in said open position, and for allowing fluid communication between said chamber and the conducting member associated with said one end when said vent cap is in said closed position.