Parr Instrument Series 4558 - Manual (Page 14)

4555 - 58 Series
5G & 10L Pressure Reactors
- 13 -
IDENTIFY THE VALVES
Gas Inlet Valve
The gas inlet valve is easily identified when the vessel is open by noting that it is
connected to a dip tube which extends to a point near the bottom of the cylinder. Typically,
this is an angle valve with an attached fitting which provides a socket for attaching the
A495HC pressure hose furnished with the reactor.
Gas Release Valve
The gas release valve is connected to a plain opening on the underside of the head. Gas
released from this valve will be drawn from the top of the reactor.
Liquid Sampling Valve
The liquid sampling valve is attached to the same fitting as the gas inlet valve and
connected to the same dip tube. With this arrangement, incoming gas is always introduced
below the surface of the liquid and the operator is provided with a means for clearing the dip
tube to be sure that any sample taken during a run will be representative of the charge. This
can be done by opening the gas valve momentarily to force any liquid in the dip tube back
into the reactor before withdrawing a sample from the sampling valve.