Tweco PAK 44G - Manual (Page 34)

CUSTOMER/OPERATOR SERVICE 28 Manual 0-2686
5.05 Gas Pressure Regulators
Components of the Gas Pressure Regulators are as fol-
lows:
1. Inlet connection
2. Inlet pressure gage
3. Safety valve
4. Working pressure gage
5. Hose connection
6. Adjusting knob
1
6
5
2 4 3
A-01894
Figure 5-1 Components of Gas Pressure Regulator
The gas pressure regulators provide a means of conve-
niently selecting and maintaining the required working
pressures of the gases. The regulator will hold this pres-
sure constant. Inlet pressure is reduced in one step to the
working pressure by means of a pressure balanced pop-
pet valve controlled by a spring loaded piston in a low
pressure chamber. A large adjusting spring knob (6) pro-
vides for adjusting spring pressure against its piston. A
sintered stainless steel filter, in the inlet connector (1),
prevents dirt from entering the regulator mechanism.
No regular maintenance of the gas pressure regulators is
required, except an occasional lubrication of the adjust-
ing screw thread and on its end, where it contacts the
adjusting spring. Lubricant is available from Thermal
Dynamics for this purpose (Catalog No. 9-2871).
Replaceable parts in the regulator include the pressure
gages, the O-ring seals on the piston and above the pop-
pet valve, and the poppet valve. Refer to Section 6 for
replacement parts.
CAUTION
Do not attempt to remove the sintered metal filter
in the inlet connection. This is not a serviceable
item.