Patent ID: 6926251

Claim:
A free floating diaphragm flow control valve comprising: a cylindrical outer valve body ( 2 ) with its two opposite ends ( 5 , 5 a ) joined radially to a concentric cylindrical inner body (Z 1 ), and with a partition plate ( 1 ) in the inner cylindrical body, dividing said inner body into two portions, an interior cylindrical inlet chamber (A) in the first portion of said inner cylindrical body, having open end (E 1 ) for connection to the up stream pipe, an interior cylindrical outlet chamber (B) in the second portion of said inner cylindrical body having open end (E 2 ) for connection to the down stream pipe, a cylindrical cavity ( 3 ) created between the cylindrical wall of outer cylindrical body ( 2 ) and concentric seat ( 1 A) for diaphragm ( 4 ), where said seat ( 1 A) is provided by the wall of inner cylindrical body (Z 1 ), slotted openings ( 1 C, 1 D) through the cylindrical wall of the inner cylindrical body (Z 1 ) on both sides of the partition plate ( 1 ) where said slots fluidly connect the cylindrical cavity ( 3 ) to the interior cylindrical inlet chamber (A) on one end of the partition plate ( 1 ) and to the interior outlet cylindrical chamber (B) on the other side of the partition plate ( 1 ) of the valve body, a enclosure box ( 5 L) to accommodate the doubled up ends of the diaphragm ( 4 ) and a tie assembly ( 7 A; 7 ; 10 A; 11 ; 12 ), a lid ( 6 ) to cover the outer opening of the receptacle enclosure box ( 5 L), an elastomeric rectangular sheet diaphragm ( 4 ) positioned in the cylindrical cavity ( 3 ) between the two cylindrical walls of the inner and outer cylindrical bodies ( 2 , Z 1 ), and partially encircles the cylindrical seat ( 1 A) to control fluid flow through a plurality of slotted openings ( 1 C, 1 D) provided in the inner cylindrical body Z 1 , and its two opposite corresponding end portions (Y 1 , Y 2 ) extend convergingly outward away from the center of the valve into cavity 3 A of the enclosure box, where its two doubled up ends are tied together by means of a tie assembly ( 7 A; 7 ; 10 A; 11 ; 12 ) means ( 22 , 22 B) to pressurize and means ( 22 B, 22 A) to depressurize the looped diaphragm ( 4 ), to allow or to block fluid flow, from the inlet chamber (A) to the outlet chamber (B), means ( 8 ) to actuate the diaphragm ( 4 ) by working in tandem with the pressure inside and outside of the loop of diaphragm 4 .