Pressure operated flow control device

Claim 2

A flow control device comprising a casing having inlet means, outlet means and interior wall means forming a flow passage therebetween; main valve means including a valve seat disposed in said flow passage and diaphragm means cooperating with said valve seat to control flow between said inlet means and said outlet means, said diaphragm means having a first side defining an operating pressure chamber and a second side defining an inlet pressure chamber; control means for operating said main valve means including a bleed line port in a portion of said interior wall means upstream of said valve seat, bleed line means communicating with said inlet pressure chamber at said bleed line port and with said flow passage downstream of said valve seat, bleed valve means controlling flow through said bleed line means, and passage means communicating with said bleed line means and said operating pressure chamber to subject said operating pressure chamber to inlet pressure to close said main valve means and to outlet pressure to open said main valve means, said portion of the interior wall means being substantially parallel to the flow passage; and flow disrupting means extending into said flow passage to create turbulent flow adjacent said bleed line port whereby the pressure at said bleed line port is maintained at a level to close said main valve means even under high flow conditions; said flow disrupting means being carried on said second side of said diaphragm means.

Claim 3

A flow control device as recited in claim 1 wherein said flow disrupting means includes a baffle integrally formed with said diaphragm means and aligned with said bleed line port.

Claim 4

A flow control device as recited in claim 2 wherein said baffle extends substantially transversely from said diaphragm means.

Claim 5

A flow control device as recited in claim 3 wherein said baffle has a surface with a substantially rectangular configuration disposed to face flow from said inlet means.

Claim 6

A flow control device as recited in claim 1 wherein said flow disrupting means includes a baffle extending substantially transversely to the direction of flow through said inlet pressure chamber.

Claim 7

A flow control device as recited in claim 5 wherein said baffle extends substantially transversely from said second side of said diaphragm means in alignment with said bleed line port.

Claim 8

A flow control device comprising a casing having inlet Means, outlet means and interior wall means forming a flow passage therebetween; main valve means including a valve seat disposed in said flow passage and diaphragm means cooperating with said valve seat to control flow between said inlet means and said outlet means, said diaphragm means having a first side defining an operating pressure chamber and a second side defining an inlet pressure chamber; control means for operating said main valve means including a bleed line port in a portion of said interior wall means upstream of said valve seat, bleed lines means communicating with said inlet pressure chamber at said bleed line port and with said flow passage downstream of said valve seat, bleed valve means controlling flow through said bleed line means, and passage means communicating with said bleed line means and said operating pressure chamber to subject said operating pressure chamber to inlet pressure to close said main valve means and to outlet pressure to open said main valve means, said portion of the interior wall means being substantially parallel to the flow passage; and flow disrupting means extending into said flow passage to create turbulent flow adjacent said bleed line part whereby the pressure at said bleed line port is maintained at a level to close said main valve means even under high flow conditions; said bleed line means including a bleed valve chamber communicating with said passage means, a restricted bleed passage communicating with said bleed line port and said bleed valve chamber, a by-pass bleed passage communicating with said bleed line part and terminating at an inlet bleed passage valve seat in said bleed valve chamber, and an outlet bleed passage communicating with said flow passage downstream of said valve seat and terminating at an outlet bleed passage valve seat in said bleed valve chamber; said bleed valve means including valve member means cooperating with said inlet and outlet bleed passage valve seats to selectively connect said by-pass bleed passage or said outlet bleed passage with said bleed valve chamber; said diaphragm means including a substantially flat diaphragm having a protruding control portion forming a valve member cooperating with said main valve seat; and said flow disrupting means including a baffle integrally formed with said diaphragm and extending substantially transversely from said second side in alignment with said bleed line port.

Claim 9

A flow control device comprising a casing having inlet Means, outlet means and interior wall means forming a flow passage therebetween; main valve means including a valve seat disposed in said flow passage and diaphragm means cooperating with said valve seat to control flow between said inlet means and said outlet means, said diaphragm means having a first side defining an operating pressure chamber and a second side defining an inlet pressure chamber; control means for operating said main valve means including a bleed line port in a portion of said interior wall means upstream of said valve seat, bleed lines means communicating with said inlet pressure chamber at said bleed line port and with said flow passage downstream of said valve seat, bleed valve means controlling flow through said bleed line means, and passage means communicating with said bleed line means and said operating pressure chamber to subject said operating pressure chamber to inlet pressure to close said main valve means and to outlet pressure to open said main valve means, said portion of the interior wall means being substantially parallel to the flow passage; and flow disrupting means extending into said flow passage to create turbulent flow adjacent said bleed line part whereby the pressure at said bleed line port is maintained at a level to close said main valve means even under high flow conditions; said bleed line means including a bleed valve chamber communicating with said passage means, a restricted bleed passage communicating with said bleed line port and said bleed valve chamber, a by-pass bleed passage communicating with said bleed line part and terminating at an inlet bleed passage valve seat in said bleed valve chamber, and an outlet bleed passage communicating with said flow passage downstream of said valve seat and terminating at an outlet bleed passage valve seat in said bleed valve chamber; said bleed valve means including valve member means cooperating with said inlet and outlet bleed passage valve seats to selectively connect said by-pass bleed passage or said outlet bleed passage with said bleed valve chamber; said diaphragm means including a substantially flat diaphragm having a protruding control portion forming a valve member cooperating with said main valve seat; and said flow disrupting means including a baffle integrally formed with said diaphragm and extending substantially transversely from said second side in alignment with said bleed line port.