Gas
Valve Instructions
1. Gas valve installation: Apply light coating of lubricant to
sealing "O" ring. Tighten 3/4 Hex body against top surface
of valve stem to 100-110 inch-pounds of torque. Never loosen body
assembly to discharge gas pressure.
2. To open gas valve: Remove gas valve cap. (Using suitable wrench,
hold 3/4" Hex body from turning and with wrench turn 3/4"
Hex top swivel nut (left hand) counter clockwise approximately three
turns to open valve.
3. To close gas valve: Tighten 3/4" Hex top swivel nut (right
hand) clockwise to 50-70 inch-pounds of torque. Replace and tighten
gas valve cap to extreme finger tightness.
Gauging Head Assembly
Consists of air chuck, bleeder valve and gas charging (tank) valve
mounted into an adapter and
attached as one unit directly to the gas valve assembly of surge
suppressors. When attached to
any size surge suppressor, the gauging head assembly enables gas
precharge to be checked,
increased or decreased. Readings of surge suppressor operating pressure
can also be taken
using the gauging head assembly.
Charging Hose Assembly
Furnished to connect the gauging head assembly to gas bottles
in order to increase precharge to proper pressure.
It consists of a 10 feet of hose, attached to a swivel connector
on one end and a gland nut assembly on the other. Also required
is a pressure gauge of the appropriate range: 0-100 PSI; 0-300 PSI;
0-600 PSI, etc.
Operation
Note A - Precharge: To read or adjust gas pressure of "precharge"
pressure, liquid must be drained from fluid side of surge suppressor
/ PD to zero hydraulic pressure.
Note B - Operating Pressure: To read hydraulic pressure or "operating"
pressure, do not drain fluid from surge suppressor. Read hydraulic
pressure while unit is in normal operation. |
Installation
1. Remove valve guard and valve cap from surge suppressor /
PD. See Notes A & B before proceeding.
2. (For units up to and including 10 gallons). To mount the gauging
head, mount swivel of air chuck on surge suppressor's gas valve
stem, compressing gasket in swivel to prevent gas leakage. (For
units 25 gallons and up). Check surge suppressor gas valve assembly
for leaks with soapy water solution.
4. Replace surge suppressor gas valve cap and tighten one-half
turn beyond hand tightness.
5. Replace surge suppressor valve guard.
6. Check for precharge loss within one week after installation.
Precharging Method
(See Note A before proceeding.)
1. Mount gland nut of hose assembly on nitrogen bottle.
2. Remove cap from gas charging valve and attach swivel connector
of hose assembly. Hand tighten sufficiently to compress gasket
in swivel connector to prevent gas leakage.
3. Proceed to pressurize surge suppressor to predetermined pressure
by opening valve on nitrogen bottle slowly, closing it occasionally
to allow needle on pressure gauge to settle in position, thus
giving accurate reading of precharge pressure.
4. When correct precharge has been reached, close valve in nitrogen
bottle securely.
5. Bleeder valve can be used to let out any gas pressure in excess
of desired precharge.
Removal
1. (For units up to and including 10 gallon) Retract shaft of
air chuck by turning bar handle counterclockwise to full stop
position before disconnecting swivel; thereby, preventing excess
leakage of gas from surge suppressor. Remove chuck from surge
suppressor gas valve stem. (For units 25 gallons and over). Using
two wrenches, keep the bottom nut of the gas valve stationary
and rotate the top nut of the valve in a clockwise direction,
closing the valve. Remove chuck from surge suppressor gas valve
stem (Figure 24).
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