Charging and Gauging Units

To maintain system performance HYDAC recommends that the gas pre-charge pressure is checked regularly. The inevitable loss of gas pre-charge 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 pre-charged 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 pre-charge pressure of an accumulator. For critical systems, consider the use of a permanent gauging block which will provide for continuous monitoring.

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 several types of charging and gauging units:

• FPK for use with HYDAC version 1 gas valve
• FPS for use with HYDAC version 4 gas valve
• FPO for use with HYDAC version 4 gas valve