Automatic temperature and humidity regulation – Motors – Fluid-operated
Patent
1978-07-20
1979-06-05
Wayner, William E.
Automatic temperature and humidity regulation
Motors
Fluid-operated
137489, F16K 3112, G05D 2300
Patent
active
041571592
ABSTRACT:
A fluid flow regulating device for use in fluid handling systems which is capable of maintaining substantially constant flow rates over a wide range of variations in system pressure. The device includes a housing having disposed therein a conduit whose lateral wall includes one or more apertures of a predetermined configuration. A piston is disposed within the conduit and is axially displaceable, in response to pressure differentials, throughout the portion of the conduit wherein the apertures are located. A spring mechanism having a specified non-linear coefficient of stiffness is employed to yieldably resist downstream displacement of the piston. The piston and aperture together form a variable area flow passageway through which substantially all the fluid must pass. A pneumatic, thermometric mechanism may also be employed to displace the piston within the conduit in response to changes in temperature and independent of pressure variations. Finally, the device may be arranged so that its sole source of energy is derived from the air flow being regulated, thus eliminating any need for an external energy source.
REFERENCES:
patent: 3779275 (1973-12-01), Ley et al.
patent: 3806027 (1974-04-01), Ginn et al.
Mark Controls Corporation
Wayner William E.
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