VALVE CONTROLLED BY MEANS OF DIAPHRAGM DEPENDING ON PRESSURE DIFFERENTIAL Russian patent published in 1999 - IPC

FIELD: maintaining of definite pressure, applicable in heating systems. SUBSTANCE: valve body 1 between inlet and outlet ports 2 and 3 has a grooved duct with seat 4 engageable with shut-off member 27. Diaphragm 7 is loaded by spring 18 with a preset force. The external edge of diaphragm 7 is squeezed between cover 9 and lower part 5 of compartment 6 formed by the upper side of body 1. Folded edge 10 of body 1 is engaged with cover 9. The inner surfaces of lower part 5 of compartment 6 and cover 9 pass in parallel with each other. Diaphragm 7 divides compartment 6 into internal pressure chamber 11 communicating with chamber 13 of body 1 through hole 12, and external pressure chamber 14 communicating with pressure pickup 16 through a pressure pipe-line. Inlet pressure acts on internal pressure chamber 11, and return piping pressure acts on the upper pressure chamber. EFFECT: reduced valve overall dimensions. 9 cl, 2 dwg