| 摘要 |
A dispensing system including a tank and a constant displacement pump mounted on the tank for dispensing liquid from the tank. Liquid is withdrawn from the tank via an adapter mounted in the tank bung and having two concentric tubular members, the inner of which receives a tube connected to the pump inlet. A standpipe extends downwardly from the inner tubular member so that liquid is withdrawn from lower portions of the tank. A bypass bore, containing a pressure relief valve, is formed in the pump body between the pump outlet and a recirculation port to return liquid from the pump outlet to the recirculation port when a valve on a delivery line from the pump is closed. The recirculation port is fluidly connected to the outer tubular member of the adapter to return the liquid to the tank.
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