BALANCED VALVE

Proceed as follows:
Slightly open the outlet shut-off valve, and then slightly and very slowly open the inlet shut-off valve. Next, reset the slam-shut valve (when fitted) and wait for outlet pressure to stabilize, then fully and very slowly open the outlet
valve.

It is recommended that the regulator be periodically checked in order to ensure its proper functioning.
1. Checking regulator
Slowly close the outlet shut-off valve and check pressure in the length of pipe between the regulator and the valve. If the system is functioning properly, an increase in outlet pressure will be noticed due to lock-up
pressure, after which pressure will stabilize. If, on the contrary, outlet pressure continues increasing, the
system is not functioning properly due to improper valve disc tightness. In this case, close the valve located upstream of regulator and carry out maintenance procedures as set out in general maintenance below.
2. Checking relief valve (when fitted)
Close the valve located downstream of regulator. Next, connect a manual pump or other similar device to a previously fitted impulse connection between the regulator and the valve and raise the pressure until relief valve is activated, i.e. until gas is released from vent.

1. Warning
Maintenance should be carried out only by qualified, skilled personnel. If required, please contact our Technical Department or authorized dealers .
Before carrying out maintenance procedures, make sure that no gas under pressure is trapped in the regulator body. In order to release all gas from the regulator, first close inlet and outlet valves and then release gas from the line by opening the appropriate vent tap.
When carrying out general maintenance, replace all rubber parts. For this purpose, use only the spare parts included in LILI’S spare parts kit.
Maintenance operations do not require removal of valve body from the line.
2. General Maintenance
A. Remove screws (52) and clamp (53) in order to take off diaphragm case. By removing diaphragm case, the balancing unit and pad (22) will also come off.
B. Unscrew pad retainer (30) and check for proper condition of pad unit (22).
C. Loosen stem (19) and disassemble all balancing unit components. Carefully clean all parts with petrol. Check diaphragm (21) and replace any parts which are found to be worn out.
D. By means of the appropriate tool, unscrew seat (28) and check O-ring (23). Replace seat if worn or damaged.
E. Remove cap (1), ring nut (2) and spring (3), taking care to mark the exact position of the ring nut for remounting.
F. Remove screws (40) and take off cover (4) .
G. Remove the diaphragm assembly from the diaphragm case.
H. Strip the diaphragm assembly down into its various components. In the models fitted with relief valve,
unscrew register nut (5) and then remove spring (8), taking care to mark the height of the preloaded spring in order to reassemble it in its original position, thus ensuring proper setting of the relief valve. Finally, unscrew ring nut (11). For all other models, simply remove nut (5) and unscrew ring nut (11).
I. Check diaphragm (16), seal (39), relief valve (13) and O-ring (48). Replace any parts which are found to be worn or damaged.
L. Check O-rings (18 and 27).

3. Reassembling
Reassemble parts by carrying out the steps outlined in part 2 above in reverse order. Upon reassembling, make sure that each part moves freely. Moreover, take care that:
A. Take care of all the seals . Use utmost care to ensure against any damage during reassembling.
B. Diaphragm (16) is properly reassembled by lubricating it with some grease and by carefully fitting it into the case (34) .
C. All screws are duly tightened in order to ensure proper sealing.
D. There are no leaks, by using soapy water.