Pressure Regulation; Setting The Pressure - Refco PRV-2000 Manual De Instrucciones

7.1 Pressure regulation

Connecting the pressure regulator
Before screwing on the pressure regulator (8), open the cylinder valve once briefly
to blow out any dirt present. During this process, do not stand in front of the valve
and do not hold your hand in front of the valve.
When installing the pressure regulator (8), all components coming into contact with
the gas must be completely free of oil and grease.
Before connecting the pressure regulator to the gas cylinder, check that the cylinder
definitely contains nitrogen (N2).
Check the nitrogen cylinder connection. Do not under any circumstances connect
the pressure regulator if it is damaged or leaking.
Depressurise the pressure regulator by turning the setting hand wheel (8) to the zero
position (anti-clockwise).
Connect the pressure regulator to the nitrogen cylinder by tightening the connection
nut (1) securely. Do not tighten the threaded connection too much as this could
damage the seal. The setting handwheel (8) must be pointing vertically downwards.

7.2 Setting the pressure

First close the shutoff valve (6) and depressurise the pressure regulator by unscrewing
the adjusting screw (8). Slowly open the cylinder valve. The high pressure gauge (9) will
now be indicating the cylinder pressure. Open the shutoff valve (6) and open the
corresponding shutoff valve slightly on the consumer equipment. Now set the required
backpressure (working pressure) by screwing in the adjusting screw (8) and take the
reading from the low pressure gauge (10). Correct the pressure setting in the event of a
pressure drop.
7.3 Disconnecting the pressure regulator
It is not permitted to remove the pressure regulator when under
pressure!
Close the nitrogen cylinder valve.
Release the pressure from the low pressure range. Make absolutely sure
that the pressure regulator and the nitrogen cylinder connection (1) are not
under pressure. During the check, the primary pressure (9) and secondary
pressure gauge (10) must be on zero.
First hold the pressure regulator with your hand and carefully (there may be
residual pressure present) loosen the connection between the pressure regulator
and the gas cylinder valve with a half or a whole turn. To make sure that all the
gas has been released, waggle the pressure regulator briefly. Do not remove the
pressure regulator before doing this.
Ensure that the setting handwheel (8) has been fully depressurised and store
the pressure regulator in the case together with the other components. This
ensures that the threaded connections and gauge are optimally protected
against damage.