Initial Operation
Before the system is pressurised it has to be bled. For this,
the vent screw in the fluid port assembly has to be eased
until fluid emerges.
Then retighten the gas valve locknut carefully.
The system is charged with maximum pressure and
sealings and connections should be checked.
Periodic Checking
After the installation of a new unit, or following repairs, the
initial pressure must be tested as follows:
Atleast once during the first week so that any gas losses
can be immediately observed and remedied.
If no gas losses are observed during the first check, a
second check should be carried out approximately 3
months later,
If during this check no gas losses are evident, a six-month
check should be sufficient.
It is however recommend that heavy duty applications be
checked every month.
Checking & Charging
Pre-Loading & Checking Set type-PC (refer Fig.15) is to be
used for checking / charging of Bladder Accumulators.
When charging, the nitrogen bottles must be capable of
delivering pressure higher than the desired accumulator
gas pressure.
Use dry industrial nitrogen. NEVER USE OXYGEN OR AIR.
Proceed as follows:
Ÿ
Fit the suitable pre-charging equipment to the gas
valve;
Ÿ
Connect it to the nitrogen cylinder with the charging
hose;
Ÿ
Slowly introduce nitrogen into the accumulator until
reaching a pressure slightly above the required level;
Ÿ
Close the valve of nitrogen cylinder and disconnect the
charging hose from the equipment;
Ÿ
Wait for the gas temperature stabilization;
Ÿ
Set the pressure by venting off the excess of gas.
It is important that the gas pressure be kept constant and
should therefore be checked periodically by means of the
filling and checking equipment PC/...
The same equipment is used for re-inflating the bladder
after repair work or change of use.
Connection is made by the special hose to the dry
nitrogen bottle.
ONLY NITROGEN MUST BE USED. AIR OR OXYGEN
COULD CAUSE AN EXPLOSION.
Pressure Checks
This is simple operation, the correct procedure is as
follows:
Ÿ
Isolate the accumulator from the system and reduce
the liquid pressure to zero.
Ÿ
Remove the protective and sealing caps from the gas
valve.
Ÿ
Prior to the mounting PC/ - equipment ensure that the
valve A is unscrewed, that bleed valve B is closed and
that is non-return valve C is screwed tight. (refer
Fig.16)
Ÿ
Attach the unit to the gas-fill valve by means of the
knurled nut D.
Ÿ
Screw valve A to a point where pressure is registered.
If the pressure is OK remove the PC/unit as follows:
Ÿ
Unscrew the valve A.
Ÿ
Open the bleed valve B and unscrew the nut D.
Pressure Reduction
If the pressure has to be reduced this is done by opening
the bleed valve B slowly until the correct pressure is
registered on the gauge.
Operation & Maintenance
Bleed
Ring Nut
Non-Return Valve
Connection for
Charging Hose
Pin
5/8” UNF
125
20
Fig.15
Fig.16
