3
3.3 HANGER ROD ADJUSTMENT
When placing the Gas Block in operation, the hanger rod should be adjusted so that the torch will close the valves with the torch equipment’s weight.
When the torch is placed on the hanger rod, the torch flame should be extinguished. If the flame is not extinguished, perform the following operations:
A. Loosen the hanger rod lock screw
(Item 4 TABLE B)
and slide the hanger rod
(Item 2 TABLE B)
and torch forward in the hanger block
(Item 3 TABLE B)
to a
position where the flame is extinguished when torch is placed on the hanger rod hook.
B. Tighten the hanger rod lock screws.
C. If either gas continues to flow, it may be necessary to adjust the shut-off valve seat pressure. This operation is described in “3.4 Shut-Off Valve Adjustment.”
3.4 SHUT-OFF VALVE ADJUSTMENT
Initial adjustment(s) were made at the factory. Readjustments should only be performed if hanger rod adjustment fails to provide positive valve shut-off of gases or
if the proper gas shut-off sequence has changed due to service, repair, etc.
A. Torch equipment should be in place on the hanger rod during adjustment.
B. To make adjustment(s) only the gas pressure of the valve being adjusted should be on. Adjustments of fuel gas and oxygen valve should be done in a well
ventilated area away from all sources of ignition.
C. Loosen the shut-off valve locking nut
(Item 11 TABLE B)
.
D. Turn valve adjusting screw
(Item 12 TABLE B)
clockwise until gas flow ceases, then turn one-half turn more.
E. Re-tighten locking nuts, not allowing adjusting screws to turn while tightening.
3.5 OXY-FUEL SHUT-OFF SEQUENCE ADJUSTMENT
A popping sound may occur at shut-off (when lighted torch is returned to hanger rod). This occurs primarily because the oxy-fuel gas pressure settings are not set
properly or the oxy-fuel shut-off sequence is set improperly.
A. Adjust tip pressure settings according to the manufacturers recommendations. If popping persists, adjust oxy-fuel shut-off sequence. (See 3.58 below.)
B. Resetting oxy-fuel gas shut-off sequence requires that oxygen be shut-off first and fuel gas last with a slight delay between to prevent popping. To reset
sequence, loosen fuel gas shut-off valve locking nut. Turn adjustment screw counterclockwise one-half turn and test system. If popping persists, turn screw further
and retest. When popping ceases, re-tighten locking nut while preventing screw from turning.
3.6 SERVICE
Whenever leaks or improper operation of a Gas Block System persists and cannot be corrected by adjustments mentioned in 3.3 and 3.4 above, removal from service
and repair may be required.
A. Removal from service:
• Close pipeline and/or cylinder valves upstream of the regulators.
• Lift torch from Gas Block hanger rod with torch valves open to bleed pressure from system.
• When regulator outlet gauge reading(s) drop to zero, turn regulator adjustment counterclockwise until loose.
• Remove Gas Block from operation.
B. Repair service:
Harris recommends, unless personnel at your facility are specifically trained to do so, that the Gas Block be sent to an experienced repair facility. Special tools,
techniques and trained personnel are required.
3.7 USER RESPONSIBILITIES
This equipment will perform safely and reliably only when installed, operated, maintained and adjusted in accordance with the instructions provided. Equipment
must be checked periodically and serviced, replaced or reset as necessary for continued safe and reliable performance. Defective equipment should not be used.
Parts that are broken, missing, plainly worn, distorted, or contaminated should be replaced immediately with parts that are manufactured or sold by Harris Products
Group. The equipment or any of its parts should not be modified without prior written approval from The Harris Products Group. The user of this equipment shall have
the sole responsibility for any malfunction which results from improper use, faulty maintenance, or repair using parts other than from The Harris Products Group, or
using parts that have been damaged or modified by anyone other than Harris Products Group.
To assure proper operation and warranty coverage, use only genuine Harris parts with this equipment. For assistance, visit the Harris website at
www.harrisproductsgroup.com.
