8302216 [Accumulator Test Tool]
Instruction Guide
1404 13
th
St. South Humboldt, IA 50548 Phone: 844.247.2162 www.hy-capacity.com
052019
INST-8302216.DOCX
WARNING!
Never use oxygen or air – this could cause an explosion! Use dry nitrogen or other
recommended gases.
Preparation
To check the gas precharge pressure in an accumulator, it must first be
isolated from the system shut off, and all hydraulic pressure relieved.
HYDAC Gas Valve Version 1
(
see Fig. 2
)
Unscrew the valve protection cap. Slightly loosen the socket head cap
screw with an Allen wrench (
approx. 1/6 turn, see Fig. 2
).
FPK Unit
Prior to connecting the charging and gauging unit to an accumulator,
close manual bleed valve by hand tightening. Connect the unit to the
accumulator by screwing cap nut onto HYDAC gas valve version 1;
hand tighten (
see Fig. 1
).
Checking Gas Precharge Pressure
Connect the appropriate charging and gauging unit to the
accumulator following the instructions under “Preparation”.
FPK Unit
Turn T-handle counter clockwise a maximum of 3 full turns. The gauge
needle should indicate the existing gas precharge pressure. If there is
no gas precharge pressure indicated or if it is too low or too high,
please follow instructions under the appropriate section, either “Pressure
Release” or “Charging”. If desired gas precharge pressure registers,
please follow the instructions under “Removal of Charging and
Gauging Unit”.
Pressure Release
With the appropriate charging and gauging unit attached as previously
described, gas precharge pressure can be released by carefully
opening manual bleed valve. Release the gas precharge pressure very
slowly until the desired gas precharge pressure is reached (this insures
that the gas temperature does not fluctuate greatly, providing and
accurate gas precharge pressure). Close the manual bleed valve.
Allow the gas precharge pressure to stabilize. (
5 to 10 minutes
) recheck,
adjust if required. Once the desired gas precharge pressure is reached,
please follow the instructions under “Removal of Charging and
Gauging Unit”.
Charging
HYDAC recommends the use of a pressure regulator on the
commercially available nitrogen bottle to regulate pressure to the
charging and gauging unit.
