Spring plenum testimonium generis salutem valvae (W series)

P-A48Y₅₄ 3.82V, A48Y X-, A48Y-X, P, A48Y₅₄ 3.82V, A48Y-XX, A48Y P,₅₄ 5.29V, A48Y-XX, A48Y P,₅₄ 5.29V, A48Y-XX, A48Y P,₅₄ 10v: A48Y-XX, A48Y P,₅₄ 10v

Temperatus non minus quam C-genus pertinent A48Y 425ºC; A48Y V-genus armorum tutela esse idoneam ad nimis pressura; DL est sua caliditas opus ºC vel minus. Sicut in boiler PowerStation, lanista pressura, reducere temperatus et pressura reducing apparatus.