VALVE CONTROLLED BY MEANS OF DIAPHRAGM Russian patent published in 1999 - IPC

FIELD: applicable for maintaining a definite differential in water radiator heating systems. SUBSTANCE: positioned between inlet and outlet ports 7 and 8 of valve body 1 in central pipe 9 passing through diaphragm 6 and forming part of the passage for flow. Valve seat 11 is located on one end of pipe 9 for forming hole 20 with shut-off member 12. Shut-off member 12 is attached to diaphragm 6 squeezed over the external edge between the two parts of body 1 with formation of pressure chamber 21 and backpressure chamber 22. Backpressure chamber 22 is connected through pipe-line 23 to the point of measurement of heat-transfer agent pressure in the installation for influence of the mentioned pressure on diaphragm 6. Pressure chamber 21 responds to the pressure at one of the valve ports. Installed on the outer surface of central pipe 9 is control bush 14 connected to diaphragm 6 and shut-off member 12 and sliding on pipe 9. EFFECT: improved compactness and reduced cost. 11 cl, 2 dwg