| 摘要 |
<p>A pump has an inlet communicating with a fuel source, and an outlet which communicates with a control valve for regulating the pressure of the fuel supplied to the burner nozzle. High pressure fuel is pumped into the main valve chamber through a first outlet passage leading from the pump. A second outlet passage leading from the pump to the nozzle passage by-passes the control valve assembly so that air may be purged from the system when the pump initially is started. An air purging valve within the second outlet passage is movable for blocking fuel flow thrugh the passage during normal operation of the pump and for opening the second passage when the pump is initially started. The purging valve is operable manually or it may be operated automatically.</p> |
