MOUNTING, APPLICATION, CHECKING AND MAINTENANCE OF BLADDER ACCUMULATORS

Assembly

Cleaning all the parts and inside suiface of shell before assembling, then:
（1）Insert the bladder by pull Rod;
（2）Install the name plate and lock nut on gas valve side;
（3）lnsert the oilvalve and then the rubber coated retaining ring;
（4）Locate the oil valve on to support ring fit gaskets and spacerring, then tighten the lock nut and making sure the assembly is centrally located;
（5）Fit the bleed screw with gasket;
（6）Finally mount the gas valve,then tightens again the lock nut.

Mounting position

To achieve a high degree of efficiency, the accumlator should be fixed as close as possible that is severs lt is recom mendedthe accumulator should be installed vertically; the same time adequate space is necessary for and filling equipment.

Fastening

Correct fastening is given using clamps and brackets arranged as (fig.1)

Accumulator's connection with the pipeline

The thread connection tie-in can see the table-2. Flange connection tie-in can seethe table-3. Please note the tie-in connected with the oil-in valve should be wringed the Suitably dimension to avoid to damage the bladder.

Attention:

（1）Any welding and machining on the accumulator is absolutely forbidden.
（2）For checking gas pressure or adjusting fluid flow rate, safety block is necessary between the accumulator and hydraulic circuit.
（3）To prevent the oil back up to oil tank, a single valve is necessary to the accumulator with capacity over 10L.
（4）ln any case, must be used only nitrogen,never air or oxygen.

Nitrogen charging

（1）Nitrogen must be charged in the accumulator before starting to use.
（2）To keep constant pressure, re-charging is necessary when the gas pressure lower.

Gas charging

（1）To fill the gas into the bladder, charging kits is necessary.
（2）When pre-charge gas pressure is over 10Mpa, a specialgas charging equipment can be used.
（3）To avoid the possibility of damaging the bladder.
（4）Gas charging rate must be slow before the valve of oil fluid valve is closed.

Determination of nitrogen charging pressure

The accurate choice of pre-charge pressure is fundamental in obtaining the optimum efficiency and maximum life from the accumulator and its components, the maximum storage or release of liquid is obtained the oretically when the gas pre-chargepressure is as close as possible to the mininmum working pressure.

For practical purposes to give a safety margin. and to avoid valve shut off during operation, the valve, unless otherwise stated, is=0.9.

Special valve are used for:

（1）Hydraulic line shock damper.=0.9.
（2）Pulsction damper.=0.6.
（3）Fluid power storage.0.25≤≤0.9.
（4）Volume compensator or pressure compensatorP0≤P1.

Checking and maintenance

To keep constant pressure, re-charging is necessary when the gas pressure lower. In the same time, It is very important to find the reason of gas leading and to replace in time.

Be out of work for long time

When the accumulator stopped working, it is necessary to shut off the ball valve between the accumulator and the pressure pipe for keeping the hydraulic circuit pressure overgas pressure in the bladder.

Maintenance

（1）For the reason of gas valve, replace the gas valve after discharging completely the gas from the bladder by gas charging kit.
（2）For the reason of seal ring between the gas valve and bladder, replace it after discharging completely the gas from the badder by gas charging kit.
（3）For the reason of bladder damage, replace it after discharging completely the gas from the bladder by gas charging kit.

ln any case, if find any leaking of hydraulic oil, replace the o ring between the oid fluid valve and adapter.

Advices to safely use

（1）Accumulator is considered as a pressure vessel that is supervised by regulations. lese consut and obey local current regulations before and during the use of accumulator please insure that the fluid is compatible with the equipment. if the fluid really used is not the fluid declared in the original order, olaerweii declaim all esponsibility in case of any dysfunction and damage.
（2）Please insure the maximum allowable pressure is higher than that of the hy draulic circuit
（3）Please insure that the aiiowabll temperatuer range covers the operating temperatures (environment and hydraulic fluid temperatures).
（4）Please conside the environmental conditions and if needed, protect the accumulator aganst heat sources, electrical and magnetic fields, lightning strikes, humidity and foul weather please well fix the accumulator (oilaer saddle clamps and support backets arespecially designed for this purepose).
（5）please determine a safety area, which is not in line with the openings (hydraulic andnitrogen side). attention parts may be ejected in the event of component baeakage.
（6）Leave at least 200mm above the nitrogen gas valve for the checking and inflation instruments please replace the name plate when it is damaged or lost. oiaer can offanew name plate according to the orginealone. never use an accumulator without aname plate.

Dismantlement

First, the accumulator must be cut off and discharged from the liquid pressure and removed from the hydraulic ircuit, after that place the accumulator horizontally in a vice then proceed, for both the types,as follows:
（1）Remove the protection cap of gas valve and discharge completely the gas from the bladder by gas charging kit then dismantle the gas valve;
（2）Remove the lock nut, name, plate;
（3）Remove the gas valve;
（4）Remove bleed the bleed screw;
（5）Remove thelock nut and spacer ring;
（6）Push the oil valve into the shell and remove gaskets;
（7）Bend the rubber coated retaining ring and remove it from the shell;
（8）Remove the oil valve from the shell;
（9）Remove the bladder from the liquid side by slightly twisting.