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3.3.2.
Close the regulator by turning the adjusting knob anti-clockwise to relieve the pressure on the diaphragm before opening the cylinder
valve. If this is not done, pressure from the cylinder can damage the diaphragm and render the regulator inoperative.
3.3.3.
The cylinder valve-to-regulator connection should be checked for leaks using an approved leak detection spray or water and soap
solution. Stand so that the cylinder valve is between you and the regulator. Slowly open the cylinder valve.
3.4.
Connecting a flashback arrestor.
3.4.1.
According to safety regulations, when regulators are used with acetylene, it is compulsory to use a flashback arrestor. This should
be connected directly to the gas outlet on the regulator as shown below and the gas hose should then be fitted to the flashback
arrestor. The flash back arrestor should be colour coded RED for ACETYLENE and has to be fitted the right way round. It will have
the direction of flow marked on it. Follow the instructions provided with the arrestor. The arrestor will have reverse threaded unions
which have to be turned anticlockwise to attach them.
connecting a hose.
3.5.
note: New hoses contain a preservative talc which must be blown out with compressed air before use.
3.5.1.
Connect a hose coded RED for ACETYLENE to the flashback arrestor as shown below. Tighten nut securely with wrench. The nut
will have a reverse thread which will have to be turned anticlockwise to attach it. If any sign of oil or grease is found, discontinue use
immediately.
3.5.2.
Prior to attaching the torch blow out the hose to eliminate any particles or debris. Perform this on the hose in a well ventilated area,
otherwise you may create conditions for fire or explosion.
a) Turn the regulator adjusting screw slowly clockwise until the outlet gauge registers 5psi and acetylene begins to pass through
hose.
b) Allow the acetylene to flow for approximately 10 seconds to purge the hose.
High pressure gauge
indicates pressure
in acetylene cylinder
4. operation
4.1.
Ensure that the regulator is closed by turning the adjusting knob anti-clockwise to relieve the pressure on the diaphragm before
opening the cylinder valve. If this is not done, pressure from the cylinder can damage the diaphragm and render the regulator
inoperative.
4.2.
Slowly open the acetylene cylinder valve. As you do so the high pressure gauge (left hand) will register the cylinder pressure.
4.3.
Slowly open the regulator by turning the adjusting knob clockwise. As you do so the outlet pressure gauge (right hand) will register
the outlet pressure of gas being fed to the torch. Adjust the pressure according to the size of nozzle in use and the thickness of the
material to be cut or welded. The manufacturer of the torch will normally supply a data chart to refer to.
4.4.
Shutting down process. On completion close the cylinder valve.
4.5.
Drain gas from the regulator and hose by opening the appropriate acetylene control valve on the torch for a few seconds. Ensure
adequate ventilation when doing this.
4.6.
Close the regulator by turning the adjusting knob anti-clockwise.
© Jack Sealey Limited
Max inlet
pressure 20 Bar
Gas in from cylinder
(fitting has left hand thread)
Original Language Version
High pressure gauge
indicates pressure of
acetylene delivered to
torch
Max outlet
pressure1.5 Bar
To increase pressure
turn clockwise
To decrease pressure
turn anticlockwise
sGA4.V2 | Issue 1(L) 15/04/16
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