Digital pressure controller

Details Digital pressure controller Digital pressure controller

1984-09-19

1986-03-11

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

With condition responsive control of pump fluid valve

138 31, 417 44, 417 63, 417317, 417505, F04B 4900

Patent

active

045753130

ABSTRACT:
A pressure controller includes a set point switch mechanism by which a selectable pressure to be maintained in a pressure vessel can be set. The actual pressure in the pressure vessel is detected and converted into a corresponding electrical signal by a suitable pressure transducer. Electrical signals from the set point switch mechanism and the transducer are utilized by a computer to generate control signals for controlling a volume adjustment mechanism which adjusts the effective volume of the pressure vessel and adjusts the quantity of pressurizing fluid disposed in the vessel. The volume adjustment mechanism includes a piston disposed in a cavity which is connectable with the chamber of the pressure vessel. The volume adjustment mechanism also includes a stepper motor which can be moved in precise increments to adjust the position of the piston in the cavity.

REFERENCES:
patent: 2986898 (1961-06-01), Wood
patent: 3424370 (1969-01-01), Law
patent: 3720487 (1973-03-01), Wiley
patent: 4093404 (1978-06-01), Soehngen et al.
patent: 4248268 (1981-02-01), Choate
patent: 4321014 (1982-03-01), Eburn et al.

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