| 摘要 |
The invention relates to a fuel burner pump assembly of the type having a main regulating valve for controlling a supply of fuel to a burner nozzle and a flow responsive bypass valve for bypassing fluid from the main valve until a predetermined flow rate is achieved. A check valve downstream from the bypass valve and in series therewith has a small predetermined opening pressure which facilitates the operation of the bypass valve. The check valve utilizes a rubber sleeve as the closure member thereof which enhances the operation of the bypass valve by operating to close tightly despite the presence of small dirt particles in the fluid flow.
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