Conveyors: fluid current – With means to control conveying fluid or movement of load in... – Control of conveying fluid
Patent
1981-02-13
1983-02-15
Love, John J.
Conveyors: fluid current
With means to control conveying fluid or movement of load in...
Control of conveying fluid
406192, 137236R, B01D 100, B65G 5300
Patent
active
043738389
ABSTRACT:
A vacuum transport system for intermittently transporting sewage from a source to a collection station through a vacuum conduit under the differential influence of positive atmospheric pressure at the source and substantially lower or vacuum pressure in the vacuum conduit between a primary control valve and the collection station. The control valve of the system is operated by differential pressure to open and close the vacuum conduit at intervals for sewage transport to the collecting station when a pressure differential operated sensor-controller apparatus, which will automatically purge condensate accumulation, selectively controls the operation of the primary control valve. One part of the sensor element of the apparatus is connected in pressure communication with the sewage source, but is closed to fluid flow when in stand-by condition, and another part is connected in pressure communication with sequentially activated differential pressure responsive controller elements oriented between the sensor and the control valve. The controller elements are connectible alternately to the vacuum in the conduit and an atmospheric source, and when the sensor detects pressure variations at the sewage source, it will respond to a pre-selected sensed pressure condition at the source to sequentially activate the differential pressure responsive elements of the controller to open the control valve while detection of a second pressure condition results in closing the control valve by sequentially reversing activation of the differential pressure responsive controller elements to automatically return the sensor-controller apparatus to its stand-by mode during which air passage through the apparatus is prevented.
REFERENCES:
patent: 4171853 (1979-10-01), Cleaver et al.
patent: 4179371 (1979-12-01), Foreman et al.
patent: 4245664 (1981-01-01), Johnson
Foreman Brian E.
Grooms John M.
Burton Mechanical Contractors Inc.
Love John J.
Williams L. E.
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