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SHUTOFF VALVES. There are four shutoff valves, one on the inlet side of each pressure regulator and one on the outlet side of each regulator. These shutoff valves control the flow of oxygen from the upper manifold to the lower manifold, via the regulator. When the shutoff valves on the inlet and outlet sides of the regulator are open, the pressure regulator is ready for use. By turning the regulator control-handle clockwise, the pressure (as read on
Figure 5-13.- Type NO-2 gaseous oxygen servicing trailer. the gauge attached to the regulator) will increase. of the regulators, a delivery pressure gauge, and Turning the control handle counterclockwise a flexible hose that connects the lower manifold decreases pressure. to the drier assembly. LOWER MANIFOLD. The lower manifold DRIER ASSEMBLY. The drier assembly is provides connections/ mountings for the two a reservoir containing a chemical drying agent lower/ outlet shutoff valves from the outlet side through which oxygen must pass before going through the servicing hose. This chemical drier is provided to remove any moisture in the oxygen supply. The oxygen flows into the bottom of the drier, passes up through the drying agent, and out through the servicing hose. SERVICING HOSE AND LINE VALVE. The servicing hose is a high-pressure, nonkinking, metallic flexible hose. The line servicing valve is attached to the servicing hose and is used to control the flow of oxygen to the system being charged.
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