Pumps – With condition responsive pumped fluid control – Plural separate sensing means for a single fluid controller
Patent
1989-12-26
1991-10-01
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Plural separate sensing means for a single fluid controller
417295, 417310, F04B 4900
Patent
active
050528998
ABSTRACT:
A compressor coupled to a load of smaller capacity is provided for loading with a setpoint adjusting circuit substituting a pseudo-setpoint signal for the pressure signal derived from the load, so that the master-controller operates in response to a signal increasing gradually from a low initial value until matching in magnitude with the assigned setpoint signal for normal operation. The master-controller is modified so as to bypass the normal modulation means during loading, a minimum inlet valve opening being imposed initially and concurrently the bypass valve being allowed to close under the low initial value, inlet valve control being enabled after the bypass valve has closed and in accordance with said gradual increase of the pseudo-setpoint signal. After load pressure has reached the assigned pressure setpoint in magnitude, the master-controller normal operation is reinstated.
REFERENCES:
patent: 4080110 (1989-03-01), Szymaszek
patent: 4249866 (1981-02-01), Shaw et al.
patent: 4519748 (1985-05-01), Murphy et al.
patent: 4976588 (1990-12-01), Heckel
Lorin C. M.
Scheuermann David W.
Smith Leonard E.
Westinghouse Electric Corp.
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