Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1988-04-01
1989-11-21
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374875, 137492, G05D 1600
Patent
active
048815721
ABSTRACT:
The invention relates to a control system for adjusting the setting of a damper (9) in a ventilation duct (8) and maintaining a substantially constant pressure at a selected region in the ventilation duct, the system comprising a cylinder (1) having a vertical cylinder axis and housing a readily movable, pressure-responsive device (2), which together with the cylinder defines a pressure space. The pressure space (22) communicates with the ventilation duct at the aforementioned selected region, and drive means (11, 12) are provided for adjusting the damper setting in response to the position of the pressure-responsive device, so as to maintain a constant pressure. The inventive system is characterized in that the pressure-sensitive device (2) has a mass which corresponds to a selected pressure at the aforementioned region in the duct and is intended to balance the pressure force acting on the device.
REFERENCES:
patent: 651927 (1900-06-01), Marsh
patent: 967702 (1910-08-01), Anderson
patent: 2896850 (1959-07-01), Ashley
patent: 3047010 (1962-07-01), Rothfuss
Cohan Alan
Ljungman Nils H.
Stifab AB
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