13
Fig. 3
ELEKTROGAS VM-L GAS VALVE
Slow Opening and Fast Closing Valve with Hydraulic Damper and Flow - Rate Control
- Slow opening time : It can be regulated from a fast speed of 4 sec, to a slow speed of 25 sec. (Valves
are delivered with a standard opening time of 10 - 12 seconds).
- Initial fast opening, followed by a slow opening : it can be regulated from 0 to 100 % of the whole lift.
B
C
A
ELEKTROGAS VM-L GAS
VALVE
Governor spring
Inlet pressure test screw
Governor
Burner pressure test screw
A
Opening
Time
Regulation
Slow opening valves are supplied with an opening time of 10 - 12 seconds.
By fully unscrewing the speed adjustment screw (anti-clockwise) the valve will open quickly in about 4
seconds.
By gradually turning the speed adjusting screw (clockwise) the opening time can be slowed up to about 25 -
30 seconds.
NOTE
: Remove the red plastic cap to carry out following settings.
B
Regulation of an Initial Quick - Opening Interval Followed by a Slow - Opening Interval
The initial quick interval can be regulated from 0 to 100 % of the whole valve movement, by acting on the
slow opening adjustment screw.
Valves are supplied with the screws completely closed and therefore with a slow shutter run.
When the screw is in a closed position and then gradually opened (anti-clockwise), each complete turn is
equal to an initial part of the fast run of 1 mm.
C
Flow
Regulation
The flow regulation screw (located inside screw
B)
stops the shutter, which can be stopped at any point of
the run. When the regulation screw is in the closed position (shutter stopped against the valve seat with zero
flow) and is gradually opened (anti-clockwise) the shutter can be raised 0.8 mm at each complete turn.
Fig. 4
