6 56 MODERN STEAM PRACTICE . siderable shock . With a view , therefore , to soften the action of the valves , air vessels have been adopted on the suction and discharge boxes , with cup valves working in a cage , similar to the ball - valve arrangements , and it is found neces - … Fig . 530 . — Non - return Valve and Box . Fig . 529 . — Air Chambers . Valves . a , Non - return valve and box . b , Pipe from a , Pump barrel . c , Air vessel and suction valves , pump , c , Expansion joint . and d , Delivery valve and air vessel . which varies from ^ to of an inch . A valve with…
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