143. Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true

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inlet pressure acts on the lower surface of the top disc and the upper surface of the bottom disc for the purpose of achieving hydraulic balance so that inlet pressure does not influence the valve position.

143. Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true

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