(57) fluid injector 1 for an oil fuel burner suitable for firing the fuel of a boiler
includes an injection device 2 which can be inserted into the wall of the boiler to
an operating position at which oil discharge can be safely permitted and withdrawn
from that operating position for inspection and servicing. A flow control valve 3
of the fluid injector 1 is adapted for connection to an oil fuel and delivery circuit
and is mounted in a fixed position relative to the boiler wall. The fluid injector
1 also includes a fluid coupling device 11 between the injection device 2 and the
flow control valve 3. The fluid coupling device includes male and female terminals
19 and 20, respectively, which are fast with the injection device 2 and the flow control
valve 3, respectively. The male and female terminals 19 and 20 are disconnected as
the injection device 2 is withdrawn whilst the change-over valve remains mounted to
the boiler wall and connected to the oil fuel and return circuit, at which time the
female terminal 20 isolates that circuit from the withdrawn injection device 2 and
seals flow from the circuit within itself. When the injection device 2 is inserted
to its operating position, the male terminal 19 interconnects with the female terminal
20 to communicate the oil fuel and delivery circuit with the injection device 2 through
the flow control valve 3. The flow control valve 3 may provide a direct flow path
through itself when the injection device 2 is withdrawn to allow oil to circulate
continuously in the oil fuel and delivery circuit at that time.
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