Return Nozzle Rod Rdn - elco EKEVO N6.2400 GL-E Original Operating Instructions

Commissioning

Return nozzle rod RDN

Description
The return nozzle rod RDN is suitable for
operation with Fluidics return nozzle
type W or Bergonzo CBM type B with 7/
8" connection thread. These nozzles are
fitted with an integral, spring-loaded
shut-off system, in which a stop needle
directly closes the nozzle aperture. The
stop needle is operated by the control
needle, which is connected to the
hydraulic piston system of the nozzle
rod.
The stroke of the control needle is
calculated so that the nozzle with the
greatest possible needle stroke in the
open needle position still has some play
between the spring plate and control
Nozzle closed
Nozzle open
36
needle head. If the pump pressure is too
little (< 20 bar) and the control needle is
not pressed on fully, one must assume
that there are differences in flow,
because then the needle position will
affect the oil return.
03/2016 - Art. Nr. 4200 1044 8002A
Return nozzle rod RDN
1 Stroke setting (control needle)
2 Hydraulic piston system
3 Fuel-oil connection, return
4 Fuel-oil connection, supply
5 Return nozzle fluidics W-50°
Please note:
The stroke (1) is set at the factory,
and must not be adjusted on the
system. The stroke (H) is 9 mm, and
can only be accurately set on a suitable
hydraulic test stand.
Function, nozzle W-50° or CBM/B
Opening the nozzle
* the piston in the hydraulic system and
with it the control needle (7) are
pulled back by the supply oil pressure
* the spring (8) in the nozzle opens the
stop needle (9)
Closing the nozzle
• the burner stops, the hydraulic piston
system is depressurised
• with the spring pressure, the control
needle (7) presses on the stop needle
of the nozzle until it closes
Opening pressure = 13 bar (fully open
at 20 bar)
Closing pressure = 10 bar
7 Control needle
8 Nozzle opening spring
9 Stop needle