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Siemens 66BA6 Amplifying and Reducing Pneumatic Relay. Model 66 | Input-to-Output Ratio | 1:6 Amplifying | 6:1 Reducing Simple Type: Amplifying and Reducing Pneumatic Relay

The Model 66 Amplifying and Reducing Relays are used to increase or decrease control-circuit pressure signals.Its input pressure, acting upon the effective area of the top diaphragm, produces a force that is balanced by the force produced by the output pressure applied over the effective area of the lower diaphragm. Any imbalance in these opposing forces will operate the plunger, increasing or decreasing air supply to the output chamber. (The amplifying or reducing ratio is fixed by the ratio of input-to-output diaphragm areas.) An increase in input opens the pilot valve to admit supply air directly to the output. A decrease in input opens the exhaust port to exhaust air from the output. An amplifying relay may be easily changed to a different ratio or into a reducing relay by changing diaphragm assembly parts

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