50
EN
8877.tif
N° 8877-GB
Rev. 06/11/90
Detail of terminal block
Neutral
1
st
Position
2
nd
Position
N
L1 L2
OPERATING PRINCIPLE
This valve has two open positions and is equipped with
a regulator. The regulator sets the hydraulic brake
activation point which, in turn, causes rapid release of
the opening first stage. After the initial release, the brake
cuts in, ensuring that the valve continues to open slowly.
This valve is also equipped with two gas flow regulators:
one for the first flame and the other for the second.
Setting the initial rapid release trip
To set the initial rapid release trip, unscrew the
protection cap “F” and use the back of the cap as a
tool to turn pin “G”. Turning clockwise decreases the
gas flow, turning counter-clockwise increases it.
This done, screw down cap “F in its original position.
Setting gas flow for the 1
st
flame
Before setting the gas flow for the 1
st
and 2
nd
flames,
loosen screw “D” (unpainted screw with raised
cylindrical head). After the gas flow has been set,
remember to tighten this screw once more.
N.B. To open to the 1
st
flame position, turn the 2nd
flame regulation ring “L” counter-clockwise by at
least one full turn. To set the gas flow for the 1
st
flame, turn knob “E”: turning it clockwise
decreases gas flow, turning it counter-clockwise
increases it. Full travel of regulator “E” for the 1
st
flame, from + to -, is approximately 3
1
/
2
turns.
When this regulator is fully open, the gas flow to
the 1
st
flame can be approximately 40% of the
total available when the valve is fully open in the
second position.
Setting gas flow for the 2
nd
flame
Loosen screw “D” (unpainted screw with raised
cylindrical head).
To set the gas flow for the 2
nd
flame, turn ring “L”: turning
it clockwise decreases gas flow, turning it counter
clockwise increases it.
This done, tighten screw “D”. Full travel for regulator
“L” for the 2
nd
flame, from + to -, is approximately 5
1
/
2
turns.
H = Identification plate
I = Flow direction indicator
INSTRUCTIONS FOR SETTING DUNGS GAS
VALVES mod. ZRDLE