Cross‐connected engines are fitted with a non‐return valve 12 in the pipe 11 between the pump chamber of one two‐diameter cylinder and the working chamber of an adjoining cylinder. Each pump‐piston is phased 90 deg. in advance of its associated power piston. The valves 12 are controlled by springs enclosed in a sealed chamber, are placed at the power‐cylinder end of the conduits, and closed by the power‐piston at the top of the stroke. They are inclined so as to divert the incoming charge towards the cylinder head, the wall of the inlet port adjacent to the half‐circumference of the valve head which is distant from the cylinder head being a close fit to said half‐circumference.
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