Fluid handling – Pressure modulating relays or followers – Plural series units
Patent
1978-09-13
1980-06-24
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
Plural series units
137 85, G05D 1600
Patent
active
042090300
ABSTRACT:
A self-contained control device for a system having a first source provided with a changeable fluid pressure value and a second source provided with a changeable vacuum value and having a pressure operated control unit that changes its operating condition in relation to the value of the pressure signal directed thereto, the control device having pneumatically operated control means adapted to be operatively interconnected to the sources and the control unit for increasing the pressure signal from the first source to the unit as the pressure value from the first source increases from a first value thereof to a second value thereof and for thereafter decreasing the pressure signal from the first source to the unit as the pressure value from the first source further increases from the second value thereof to a third value thereof. The control means are adapted to produce the signal in substantially the same manner but at different values for different levels of vacuum at the second source. The control device comprises at least three housing plates disposed in stacked relation and the control means comprise a plurality of pneumatically operated relays defined in part by the housing plates and each having diaphragms disposed between certain of the housing plates. Each relay has a chamber confined within an intermediate housing plate receiving the vacuum from the second source.
REFERENCES:
patent: 4099539 (1978-07-01), Brakebill
Cohan Alan
Robertshaw Controls Company
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