the two-input, two-output control volume
(Forall (?Self ?Time) (<=> (Active ?Time 2-2-Control-Volume ?Self) (And (2-2-Control-Volume ?Self) (Active ?Time 2-Input-Control-Volume ?Self) (Active ?Time 2-Output-Control-Volume ?Self))))
(Forall (?Self ?Time) (<=> (Active ?Time 2-2-Control-Volume ?Self) (And (2-2-Control-Volume ?Self) (Active ?Time 2-Input-Control-Volume ?Self) (Active ?Time 2-Output-Control-Volume ?Self)))) (Inherited-Facet-Value Slot-Value-Type 2-2-Closed-Feedwater-Heater-System Chtr-Cv 2-2-Control-Volume) (=> (2-2-Closed-Feedwater-Heater-System ?Self) (And (Value-Cardinality ?Self Cls-Fwt-Htr 1) (Value-Type ?Self Cls-Fwt-Htr 2-2-Closed-Feedwater-Heater) (Value-Cardinality ?Self Cls-Fwt-Htr 1) (Value-Cardinality ?Self Chtr-Cv 1) (Value-Type ?Self Chtr-Cv 2-2-Control-Volume) (Value-Cardinality ?Self Chtr-Cv 1) (Value-Cardinality ?Self Ht-Xchg-Prcs 1) (Value-Type ?Self Ht-Xchg-Prcs Steady-Flow-Adiabatic-Heat-Exchange) (Value-Cardinality ?Self Ht-Xchg-Prcs 1) (Cv-Component (Chtr-Cv ?Self) (Cls-Fwt-Htr ?Self)) (Component-Cv (Cls-Fwt-Htr ?Self) (Chtr-Cv ?Self)) (Process-Cv (Ht-Xchg-Prcs ?Self) (Chtr-Cv ?Self)))) (=> (Chtr-Cv $X $Y) (2-2-Control-Volume $Y)) (Inherited-Facet-Value Slot-Value-Type Steam-Generator-With-Reheat-System Sgen-Cv 2-2-Control-Volume) (=> (Steam-Generator-With-Reheat-System ?Self) (And (Value-Cardinality ?Self Sgen 1) (Value-Type ?Self Sgen Steam-Generator-With-Reheat) (Value-Cardinality ?Self Sgen 1) (Value-Cardinality ?Self Sgen-Cv 1) (Value-Type ?Self Sgen-Cv 2-2-Control-Volume) (Value-Cardinality ?Self Sgen-Cv 1) (Value-Cardinality ?Self Stmgen-Htsr-Prcs 1) (Value-Type ?Self Stmgen-Htsr-Prcs Steady-Flow-Heat-Transfer) (Value-Cardinality ?Self Stmgen-Htsr-Prcs 1) (Cv-Component (Sgen-Cv ?Self) (Sgen ?Self)) (Component-Cv (Sgen ?Self) (Sgen-Cv ?Self)) (Process-Cv (Stmgen-Htsr-Prcs ?Self) (Sgen-Cv ?Self)))) (=> (Sgen-Cv $X $Y) (2-2-Control-Volume $Y))