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To maintain system performance HYDAC recommends that the gas precharge pressure is checked regularly. The inevitable loss of gas precharge pressure due to permeability will change the system effectiveness (performance) and could cause damage to the bladder, diaphragm, or piston accumulator.
HYDAC charging and gauging units allow hydro-pneumatic accumulators to be precharged with dry nitrogen. For these purposes, a charging and gauging unit is connected to a commercially available nitrogen bottle via a flexible charging hose.
These units also allow maintenance personnel to check the current gas precharge pressure of an accumulator. For critical systems, consider the use of a permanent gauging block which will provide for continuous monitoring.
Unit of Measure

Specifications

Type

 N/A Charging and Gauging Units

Model Code Description

 N/A FPK 25 F4 G4 A3 K

Series

 N/A FPK

Gas Valve Version

 N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable

Gauge / Gas Pressure [Min]

 N/A 0 bar0 psi

Gauge / Gas Pressure [Max]

 N/A 25 bar350 psi

Charging Hose

 N/A With Cap Screw G1 (Thread W24, 32x1/14 - DIN477)

Charging Hose Length

 N/A 13 ft4 m

Connection Type

 N/A G4

Adapter / Country

 N/A G4 / USA (CGA 580)

Case

 N/A Plastic Carrying Case (Standard)

Connection Size

 N/A Thread W24, 32 x 1/14 - DIN477

Additional Adapter Type

 N/A A3

Valve Type

 N/A Bleed

BUn

 N/A EA

Division

 N/A ACCUMULATORS

Product Group Family

 N/A CHARGING AND GAUGING UNITS

Product

 N/A ACCUMULATORS ACCESSORIES

Includes

N/A The standard FPS & FPK Charging and Gauging kits include a hose with the G1 bushing and a G4 adapter for North America. Other "G" adapters are available separately or included in kit.

Additional Accessories

N/A 6 mm Allen Wrench
14 mm Open End Wrench
O-Ring (PN - 601032)
Seal-Ring (PN - 601228)
Gauge 10 (0 to 145 psi) (PN - 606759)
Gauge 25 (0 to 350 psi) (PN - 606760)
Gauge 100 (0 to 1400 psi) (PN - 606761)
Gauge 250 (0 to 3600 psi) (PN - 606762)
Gauge 400 (0 to 5800 psi) (PN - 606763)
Check Valve (PN - 610004)
Manual Bleed Valve (PN - 236445)
O-Ring - FPS (PN - 626488)
O-Ring - FPK (PN - 601049)
2.5 m Hose (PN - 236514)
4 m Hose (PN - 236515)
10 m Hose (PN - 373405)
ADAPTER G4 (PN - 2068737)
ADAPTER A3 (FPK/SB) (PN - 291533)
O-Ring - ADAPTER A3 (FPK/SB) (PN - 601964)

Additional Information

N/A Gas Valve Version 1
Metric, M28 x 1.5
Used on Diaphragm Accumulators w/ E1 gas valves and Piston Accumulators w/ VA or VB gas valves.

Adapter A3 (FPK/SB)
Part No. 291533
The A3 (FPK/SB) adapter can be used with the FPK to connect to any HYDAC version 4 gas valve for both bottom and top repairable bladder accumulators. The A3 adapter also serves as the required spacer for top repairable bladder accumulators.

All HYDAC charging and gauging units incorporate a gauge and check valve in the charging connection, and a manual bleed valve with a T-handle.
HYDAC offers charging and gauging units:

  • FPK for use with HYDAC version 1 gas valve

Note

N/A Operating and Installation Instructions are included with each charging kit.

SB Top repairable bladder accumulators must use FPK with Adapter A3 (FPK/SB), PN 291533.

Only qualified persons should perform maintenance on any type of accumulator.