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.
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Part Number

Model Code Description

Gas Valve Version

Gauge / Gas Pressure [Max]

Adapter / Country

Additional Adapter Type

Core Products

N/A FPK 10 F2.5 G3 A2 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 10 bar145 psi N/A G3 / France G3 / Mexico N/A A2
N/A FPK 10 F2.5 G4 A9 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 10 bar145 psi N/A G4 / USA (CGA 580) N/A A9
N/A FPK 10 F2.5 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 10 bar145 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 10 F4 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 10 bar145 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 100 F2.5 G1 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G1 / Germany N/A
N/A FPK 100 F2.5 G2 A2 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 100 bar1400 psi N/A G2 / Great Britain G2 / India N/A A2, A3
N/A FPK 100 F2.5 G2 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G2 / Great Britain G2 / India N/A
N/A FPK 100 F2.5 G4 A9 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G4 / USA (CGA 580) N/A A9
N/A FPK 100 F2.5 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 100 F4 G10 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 100 bar1400 psi N/A G10 / Russia G10 / Venezula N/A A3
N/A FPK 100 F4 G11 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G11 / China N/A
N/A FPK 100 F4 G2 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 100 bar1400 psi N/A G2 / Great Britain G2 / India N/A A3
N/A FPK 100 F4 G2 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G2 / Great Britain G2 / India N/A
N/A FPK 100 F4 G3 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 100 bar1400 psi N/A G3 / France G3 / Mexico N/A A3
N/A FPK 100 F4 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 100 F4 G7 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 100 bar1400 psi N/A G7 / South Korea N/A
N/A FPK 25 F2.5 G4 A9 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 25 bar350 psi N/A G4 / USA (CGA 580) N/A A9
N/A FPK 25 F2.5 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 25 bar350 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 25 F4 G4 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 25 bar350 psi N/A G4 / USA (CGA 580) N/A A3
N/A FPK 25 F4 G4 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 25 bar350 psi N/A G4 / USA (CGA 580) N/A
N/A FPK 25 F4.0 G4 A8 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 25 bar350 psi N/A G4 / USA (CGA 580) N/A A8, A3
N/A FPK 250 F2.5 G1 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 250 bar3500 psi N/A G1 / Germany N/A
N/A FPK 250 F2.5 G11 A3 K N/A Version 1 (M28 x 1.5) and Version 4 for SBO, SK, & SB, SB Top Repairable N/A 250 bar3500 psi N/A G11 / China N/A A3
N/A FPK 250 F2.5 G11 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 250 bar3500 psi N/A G11 / China N/A
N/A FPK 250 F2.5 G2 K N/A Version 1 (M28 x 1.5) for SBO and SK N/A 250 bar3500 psi N/A G2 / Great Britain G2 / India N/A
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