Tweco ULTRAFEED VAF-4, Руководство по обслуживанию

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ULTRAFEED VAF-4
4-28 OPERATION Manual 0-5332
Operation
With the regulator/ flowmeter connected to cylinder or pipeline, and the adjustment screw/knob fully disengaged,
pressurize as follows:
1. Stand to one side of regulator/ flowmeter and slowly open the cylinder valve. If opened quickly, a sudden
pressure surge may damage internal regulator/ flowmeter parts.
2. With valves on downstream equipment closed, adjust regulator/ flowmeter to approximate working pressure.
It is recommended that testing for leaks at the regulator/ flowmeter connection points be carried out using a
suitable leak detection solution or soapy water.
3. Purge air or other unwanted welding grade shielding gas from equipment connected to the regulator/ flowme-
ter by individually opening then closing the equipment control valves. Complete purging may take up to ten
seconds or more, depending upon the length and size of the hose being purged.
Adjusting Flow Rate
Figure 4-35 Adjust Flow Rate
With the regulator/ flowmeter ready for operation, adjust working flow rate as follows:
1. Slowly turn adjusting screw/knob in (clockwise) direction until the outlet gauge indicates the required flow
rate.
NOTE
It may be necessary to re-check the shielding gas regulator/ flowmeter flow rate following the first weld
sequence due to back pressure present within shielding gas hose assembly.
2. To reduce flow rate, allow the welding grade shielding gas to discharge from regulator/ flowmeter by opening
the downstream valve. Bleed welding grade shielding gas into a well ventilated area and away from any ignition
source. Turn adjusting screw counterclockwise, until the required flow rate is indicated on the gauge. Close
downstream valve.
Shutdown
Close cylinder valve whenever the regulator/ flowmeter is not in use. To shut down for extended periods (more than
30 minutes).
1. Close cylinder or upstream valve tightly.
2. Open downstream equipment valves to drain the lines. Bleed gas into a well ventilated area and away from any
ignition source.
3. After gas is drained completely, disengage adjusting screw and close downstream equipment valves.
4. Before transporting cylinders that are not secured on a cart designed for such purposes, remove regulators/
flowmeters.