PRESSURE DIFFERENTIAL CONTROL VALVE WITH DIAPHRAGM DRIVE Russian patent published in 1996 - IPC

FIELD: radiator type heating systems; maintenance of constant pressure differential and uniform delivery. SUBSTANCE: valve has body, first diaphragm capsule and second diaphragm capsule. Two different design versions of pressure differential valve can be made using similar components connected in different manner. Fasteners of first diaphragm capsule or fasteners of first diaphragm capsule and second diaphragm capsule are made in form of sliding bushings. Support surface made on first diaphragm engages with rod of sealing member or with one end of second diaphragm shaft provided with limiting ring on other end. Limiting ring engages with rod of sealing member. Second diaphragm is installed on shaft for longitudinal displacement. EFFECT: enlarged operating capabilities. 7 cl, 4 dwg