| 摘要 |
In producing carbonated water, CO2 gas from a storage tank is introduced into a charging chamber together with a water spray delivered by a double-acting pump. The charged water is collected in a reservoir from which a portion of the evolving gas is directed to the pump for reciprocating same; on its way to the pump, this gas flow passes through a pair of control valves held open by gas pressure from another reservoir outlet as long as the liquid in that reservoir remains below a predetermined level. When this level is reached, a float cuts off the gas pressure so that the control valves close to arrest the pump. Reciprocation of the pump piston is controlled by a switching valve which is temporarily locked in a terminal phase of each piston stroke to stress a spring in a lost-motion coupling between the piston and the valve body, the subsequent release of the locking detent enabling the instant reversal of the switching valve by snap action.
|
