OM-280439B
2017−08
Processes
Oxy-Fuel
Gas Regulation
Pressure Regulators
LP/Acetylene
Oxygen
OWNER’S MANUAL
www.HobartWelders.com
File: Accessory
TABLE OF CONTENTS
SECTION 1 − SAFETY PRECAUTIONS -READ BEFORE USING 1...........
1-1. Symbol Usage 1..................................................
1-2. Welding, Cutting, Brazing, Heating Hazards 1.........................
1-3. California Proposition 65 Warnings 6.................................
1-4. Principal Safety Standards 6........................................
SECTION 2 − INTRODUCTION 7........................................
SECTION 3 − HAZARDOUS EVENTS 7..................................
SECTION 4 − ASSOCIATED HAZARDS OF RECOMPRESSING PURE
SECTION 5 − PRE-INSTALLATION PROCEDURES: REGULATORS 8........
SECTION 6 − INSTALLATION AND OPERATION 10........................
SECTION 7 − SYSTEM SHUTDOWN 12..................................
SECTION 8 − PERFORMANCECHARACTERISTICS 12....................
SECTION 9 − CARE AND MAINTENANCE 13.............................
SECTION 10 − WARRANTY 14..........................................
OXYGEN 7..............................................
SECTION 1 − SAFETY PRECAUTIONS -
READ BEFORE USING
Protect yourself and others from injury — read, follow, and
save these important safety precautions and operating instructions.
1-1. Symbol Usage
DANGER! − Indicates a hazardous situation which, if not
avoided, will result in death or serious injury. The possible
hazards are shown in the adjoining symbols or explained
in the text.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury. The possible hazards are shown in the adjoining symbols or explained in
the text.
NOTICE − Indicates statements not related to personal injury.
OXY FUEL 2015-09
Indicates special instructions.
This group of symbols means
Warning! Watch Out! ELECTRIC
SHOCK, MOVING PARTS, and
symbols and related instructions below for necessary actions to avoid
the hazards.
HOT PARTS hazards. Consult
1-2. Welding, Cutting, Brazing, Heating Hazards
The symbols shown below are used throughout this manual
to call attention to and identify possible hazards. When you
see the symbol, watch out, and follow the related instructions
to avoid the hazard. The safety information given below is
only a summary of the more complete safety information
found in the Safety Standards listed in Section 1-4. Read and
follow all Safety Standards.
Only qualified persons should install, operate, maintain, and
repair this equipment.
During operation, keep everybody, especially children, away.
Do not use this equipment unless you are trained in its proper
use or are under competent supervision. Follow the procedures described in this booklet every time you use the equipment. Failure to follow these instructions can cause fire, explosion, asphyxiation, property damage, or personal injury.
This equipment must be used in accordance with all Federal,
State, and local regulations as well as DOT (Department of
Transportation) and CGA (Compressed Gas Association) regulations. Contact your gas supplier for more information on
the proper use of compressed gases.
In this document, the phrase “welding and cutting” also refers to oth-
er oxy-fuel operations like brazing and heating.
OM-280439 Page 1
READ INSTRUCTIONS.
Read and follow all labels and the Owner’s Manual carefully before installing, operating, or servicing equipment. Read the safety
information at the beginning of the manual and in each section.
Use only genuine replacement parts from the manufacturer.
Perform installation, maintenance, and service according to the
Owner’s Manuals, industry standards, and national, state, and
local codes.
HOT PARTS can burn.
Do not touch hot parts bare handed.
Allow cooling period before working on equipment.
To handle hot parts, use proper tools and/or wear heavy, insu-
lated welding gloves and clothing to prevent burns.
FUMES AND GASES can be hazardous.
Welding and cutting produces fumes and gases. Breathing these
fumes and gases can be hazardous to your health.
Keep your head out of the fumes. Do not breathe the fumes.
If inside, ventilate the area and/or use local forced ventilation at
the flame to remove welding and cutting fumes and gases. Some
gases (natural gas and acetylene) are lighter than air and will collect in high areas. Other gases (propane and butane) are heavier
than air and will collect in low areas. Heavier-than-air gases are
more difficult to diffuse and are more likely to accumulate. The
recommended way to determine adequate ventilation is to sample for the composition and quality of fumes and gases to which
personnel are exposed.
If ventilation is poor, wear an approved air-supplied respirator.
Read and understand the Safety Data Sheets (SDSs) and the
manufacturer’s instructions for adhesives, coatings, cleaners,
consumables, coatings, cleaners, degreasers, fluxes, and
metals.
Work in a confined space only if it is well ventilated, or while
wearing an air-supplied respirator. Always have a trained watchperson nearby. Welding and cutting fumes and gases can displace air and lower the oxygen level, causing injury or death. Be
sure the breathing air is safe. Test atmospheres in confined areas
for explosive and toxic gases before using oxy-fuel equipment.
Do not weld or cut in locations near degreasing, cleaning, or
spraying operations. The heat from welding or cutting flame can
react with vapors to form highly toxic and irritating gases.
Do not weld or cut on coated metals, such as galvanized, lead, or
cadmium-plated steel unless the coating is removed from the affected area, the area is well ventilated, and while wearing an airsupplied respirator. The coatings and any metals containing
these elements can give off toxic fumes if welded or cut.
Do not weld or cut on sealed air conditioning or refrigeration sys-
tems unless all refrigerants have been removed from the system.
OM-280439 Page 2
BUILDUP OF GAS can injure or kill.
Shut off compressed gas supply when not in use.
Always ventilate confined spaces or use approved air-supplied
respirator.
LIGHT RAYS can burn eyes and skin.
Light rays from the welding and cutting process produce intense visible
and invisible (ultraviolet and infrared) rays that can burn eyes and skin.
Sparks fly off from the weld.
Wear approved face protection fitted with a proper shade of filter
lenses to protect your face and eyes from light rays and sparks
when welding, cutting, or watching (see ANSI Z49.1 and Z87.1
listed in Safety Standards).
Wear welding goggles, or wear welding helmet/welding face-
shield over approved goggles/safety glasses with side shields.
Use protective screens or barriers to protect others from flash,
glare and sparks; warn others not to watch the welding or cutting.
Wear body protection made from durable, flame−resistant mate-
rial (leather, heavy cotton, wool). Body protection includes
oil-free clothing such as leather gloves, heavy shirt, cuffless
trousers, high shoes, and a cap.
WELDING AND CUTTING can cause
fire or explosion.
Welding and cutting on closed containers, such as tanks, drums, or
pipes, can cause them to blow up. Sparks can fly off from the welding or
cutting operations. The torch flame, flying sparks, hot workpiece, and
hot equipment can cause fires and burns. Check and be sure the area is
safe before doing any welding or cutting.
Do not use this welding and cutting equipment with gases and
pressures other than those for which it is intended. Oxygen is not
flammable; however, the presence of pure oxygen will drastically
increase the speed and force with which burning takes place. Oxygen must never be allowed to contact grease, oil, or other petroleum-based substances; therefore, be sure there is no oil or grease
on the regulator, cylinder, valves, or equipment. Do not use petroleum-based pipe sealants. Do not use or store near excessive heat
(above 125 F/51.5 C) or open flame. Do not refer to oxygen as air
and do not use oxygen as a substitute for compressed air. Do not
use oxygen to clean clothes or work area, for ventilation, or to operate pneumatic tools. Open oxygen cylinder valves slowly. Be sure
regulator adjusting handle is in the full out (off) position before
opening oxygen cylinder valve.
Inspect all equipment before use. Do not use damaged, defective,
or improperly adjusted welding and cutting equipment. Make sure
levers and valves work properly, threads on equipment are clean
(no grease or oil) and not deformed, gauges are intact and easy to
read, regulator is clean and free of oil or dirt, and fittings are properly sized for the cylinder. Make sure hoses are clean (no grease or
oil) and ferrules are properly installed so the fitting does not slip inside the hose. Be sure all connections are tight.
OM-280439 Page 3
It is recommended that a reverse-flow check valve or a flashback ar-
restor be installed between the torch handle and the regulator. Check
valves do not prevent the propagation of a flame upstream (flashback) but are designed to prevent the unintentional backflow of gases
into the cutting attachment, torch, hoses, or regulator which could
cause an explosion or fire. A flashback arrestor can be installed on the
torch handle instead of a check valve. Miller flashback arrestors have
a reverse flow check valve and prevent the propagation of a flame upstream. If a flashback arrestor is installed, a check valve is not necessary. Using a flashback arrestor and a check valve can reduce gas
flow and affect torch operation. To help prevent the reverse flow of
gases, be sure the cylinders contain enough gas to complete the
work.
Perform work only in an area with a fireproof floor (concrete). Do
not heat concrete because it can expand and explode violently.
Perform work on a fireproof surface. Use heat resistant shields to
protect nearby walls and flooring.
Do not use if grease or oil is present on equipment or if equipment is
damaged. Have equipment cleaned/repaired by a qualified person.
Do not open a cylinder valve quickly or the regulator can be dam-
aged and cause a fire.
Do not open acetylene cylinder valve more than 3/4 turn. (For all
gases except acetylene, open cylinder valve fully to backseal the
cylinder valve.) Keep cylinder wrench on the cylinder for quick
shut-off.
Do not slightly open or “crack” fuel cylinder valve to blow debris
from the valve outlet. Remove the debris using nitrogen, air, or a
clean, oil-free rag.
Always purge gas from the system before lighting torch. Purge gas
in a well-ventilated area and away from flame or sparks.
Keep torch flame or sparks away from cylinder, regulator, and gas
hose.
Use only the gases recommended by the manufacturer of the
oxy-fuel equipment being used.
Never light a torch with matches or a lighter. Always use a striker.
Do not use acetylene above 15 psi (103 kPa) flowing. It is accept-
able to use acetylene regulators that indicate a static pressure up
to 22 psi (151 kPa).
Do not use torch if you smell gas. Check oxy-fuel system for leaks
with an approved leak detection solution or leak detector. Never
test for gas leaks with a flame.
Remove all flammables within 35 ft (10.7 m) of the welding or cut-
ting operation. If this is not possible, tightly cover them with approved covers.
Do not weld or cut where flying sparks can strike flammable
material.
Protect yourself and others from flying sparks and hot metal.
Be alert that welding and cutting sparks and hot materials from
welding and cutting can easily go through small cracks and openings to adjacent areas.
Watch for fire, and keep a fire extinguisher nearby.
Be aware that welding or cutting on a ceiling, floor, bulkhead, or
partition can cause fire on the hidden side.
Do not weld or cut on containers that have held combustibles, or on
closed containers such as tanks, drums, or pipes unless they are
properly prepared according to AWS F4.1 and AWS A6.0 (see
Safety Standards).
Do not weld or cut where the atmosphere can contain flammable
dust, gas, or liquid vapors (such as gasoline).
OM-280439 Page 4
Wear body protection made from durable, flame−resistant material
(leather, heavy cotton, wool). Body protection includes oil-free
clothing such as leather gloves, heavy shirt, cuffless trousers, high
shoes, and a cap.
Do not use fuel gases to clean clothes or work area.
Remove any combustibles, such as a butane lighter or matches,
from your person before doing any welding or cutting.
After completion of work, inspect area to ensure it is free of sparks,
glowing embers, and flames.
Follow requirements in OSHA 1910.252 (a) (2) (iv) and NFPA 51B
for hot work and have a fire watcher and extinguisher nearby.
CYLINDERS can explode if damaged.
Compressed gas cylinders contain gas under high pressure. If
damaged, a cylinder can explode. Since gas cylinders are normally part
of the welding or cutting process, be sure to treat them carefully.
Protect compressed gas cylinders from excessive heat, mechani-
cal shocks, physical damage, slag, open flames, and sparks.
Install cylinders in an upright position by securing to a stationary
support or cylinder rack to prevent falling or tipping. Do not lay acetylene cylinders on their sides or acetone will flow out of the cylinder
and damage the equipment.
Keep cylinders away from any arc welding, cutting, or other electri-
cal circuits.
Never drape a welding or cutting torch over a gas cylinder.
Never weld or cut on a pressurized cylinder − explosion will result.
Use only correct compressed gas cylinders, regulators, hoses, and
fittings designed for the specific application; maintain them and associated parts in good condition. Do not use compressed gas cylinder unless an approved gas regulator is attached to the gas valve.
Turn face away from valve outlet when opening cylinder valve. Do
not stand in front of or behind the regulator when opening the valve.
Keep protective cap in place over valve except when cylinder is in
use or connected for use.
Use the right equipment, correct procedures, and sufficient num-
ber of persons to lift and move cylinders.
Store compressed gas and oxygen cylinders in separate locations.
Store empty cylinders with valves closed and caps in place.
Do not modify or repair cylinders or valves. Store leaking acetylene
cylinders outdoors in a safe area. Identify leaking cylinders and return them to the supplier.
Dispose of used disposable cylinders according to the manufactur-
er’s recommendations. Do not throw cylinders in fire.
Follow instructions provided by the gas supplier and on com-
pressed gas cylinders, associated equipment, and in Compressed
Gas Association (CGA) publication P-1 listed in Safety Standards.
FLYING METAL or DIRT can injure eyes.
Welding, cutting, chipping, wire brushing, and grinding cause
sparks and flying metal.
Wear welding goggles, or wear welding helmet/welding face-
shield over approved goggles/safety glasses with side shields.
OM-280439 Page 5
1-3. California Proposition 65 Warnings
Welding or cutting equipment produces fumes or gases
which contain chemicals known to the State of California to
cause birth defects and, in some cases, cancer. (California
Health & Safety Code Section 25249.5 et seq.)
This product contains chemicals, including lead, known to
the state of California to cause cancer, birth defects, or other
reproductive harm. Wash hands after use.
1-4. Principal Safety Standards
Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,
is available as a free download from the American Welding Society at
http://www.aws.org or purchased from Global Engineering Documents
(phone: 1-877-413-5184, website: www.global.ihs.com).
Safe Practices for the Preparation of Containers and Piping for Welding
and Cutting, American Welding Society Standard AWS F4.1, from Global
Engineering Documents (phone: 1-877-413-5184,
website: www.global.ihs.com).
Safe Practices for Welding and Cutting Containers that have Held Combustibles, American Welding Society Standard AWS A6.0, from Global
Engineering Documents (phone: 1-877-413-5184,
website: www.global.ihs.com).
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1,
from Compressed Gas Association, 14501 George Carter Way, Suite
103, Chantilly, VA 20151 (phone: 703-788-2700,
website:www.cganet.com).
Acetylene, CGA Pamphlet G-1, from Compressed Gas Association,
14501 George Carter Way, Suite 103, Chantilly, VA 20151 (phone:
703-788-2700, website:www.cganet.com).
Safety in Welding, Cutting, and Allied Processes, CSA Standard
W117.2, from Canadian Standards Association, Standards Sales, 5060
Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5NS
(phone: 800-463-6727, website: www.csagroup.org).
Safe Practice For Occupational And Educational Eye And Face Protection, ANSI Standard Z87.1, from American National Standards Institute,
25 West 43rd Street, New York, NY 10036 (phone: 212-642-4900, website: www.ansi.org).
Standard for Fire Prevention During Welding, Cutting, and Other Hot
Work, NFPA Standard 51B, from National Fire Protection Association,
Quincy, MA 02269 (phone: 1-800-344-3555, website: www.nfpa.org.)
OSHA, Occupational Safety and Health Standards for General Industry,
Title 29, Code of Federal Regulations (CFR), Part 1910, Subpart Q, and
Part 1926, Subpart J, from U.S. Government Printing Office, Superintendent of Documents, P.O. Box 371954, Pittsburgh, PA 15250-7954
(phone: 1-866-512-1800) (there are 10 OSHA Regional Offices—phone
for Region 5, Chicago, is 312-353-2220, website: www.osha.gov).
Applications Manual for the Revised NIOSH Lifting Equation, The National Institute for Occupational Safety and Health (NIOSH), 1600 Clifton
Rd, Atlanta, GA 30329-4027 (phone: 1-800-232-4636,
website: www.cdc.gov/NIOSH).
Recommended Practices for Safe Oxyfuel Gas Cutting Torch Operation
C4.2/C4.2M, and Recommended Practices for Safe Oxyfuel Gas Heating Torch Operation C4.3/C4.3M from Global Engineering Documents
(phone: 1-877-413-5184, website: www.global.ihs.com).
OM-280439 Page 6
SECTION 2 − INTRODUCTION
Inspect all equipment before use. Do not use damaged, defective, or improperly adjusted welding and cutting equipment.
Make sure levers and valves work properly, threads on equipment are clean (no grease or oil) and not deformed, gauges are
intact and easy to read, regulator is clean and free of oil or dirt,
and fittings are properly sized for the cylinder. Make sure
hoses are clean (no grease or oil) and ferrules are properly installed so the fitting does not slip inside the hose. Be sure all
connections are tight and there are no leaks in the system.
This booklet offers basic information regarding oxy−fuel pressure regulators. Given reasonable care, the regulators will provide trouble-free
use for many years.
SECTION 3 − HAZARDOUS EVENTS
The following events are very hazardous and can occur in any oxy-fuel
system. It is important to understand these hazards and know how to
prevent them.
Backfire: The return of the flame into the torch, usually accompanied by
a popping sound. The flame may be extinguished or it may re-appear at
the tip end.
Sustained Backfire: The return of the flame into the torch that continues to burn inside the torch with a hissing or squealing sound.
Flashback: The return of a flame into and through the torch or into the
hose. In some instances it can reach the regulator and even enter the cylinder. Flashback is generally caused by the mixing of the oxygen and fuel gas
in the system, resulting in a very dangerous situation that can cause an explosion anywhere in the system. This is why purging is so important (see
Section 6).
SECTION 4 − ASSOCIATED HAZARDS OF
RECOMPRESSING PURE OXYGEN
Open oxygen cylinder valves slowly. Opening an oxygen cylinder valve quickly can cause a fire or explosion. Be sure regulator adjusting handle is in the full out (off) position before opening an oxygen cylinder valve.
Recompressing high pressure oxygen in a low pressure cavity may create heat, resulting in combustion. For combustion to occur, oxygen, fuel,
and kindling temperatures must be present. All of these components
may be present when oxygen is recompressed by opening the tank valve
too quickly.
OM-280439 Page 7
Oxygen: High purity oxygen accelerates the rate of combustion, increases heat output, and lowers the combustible point at which various
materials will burn.
Fuel: The fuel for combustion may be the regulator itself if enough heat is
produced to reach the kindling temperature of the regulator’s components.
Kindling Temperatures: Enough heat may be generated to ignite the
regulator components by the friction created when recompressing
high-pressure oxygen. This heat is known as the heat of recompression.
If an internal fire or flashback occurs (indicated by a whistling
sound or inverted flame), do the following:
Turn off the torch oxygen valve immediately.
Turn off the torch fuel valve.
Turn off the oxygen cylinder valve.
Turn off the fuel gas cylinder valve.
Do not relight the torch until the equipment has cooled to the touch and
the flashback cause has been determined and corrected.
SECTION 5 − PRE-INSTALLATION PROCEDURES:
REGULATORS
Do not use this equipment unless you are trained in its proper
use or are under competent supervision. Follow the procedures described in this booklet every time you use the equipment. Failure to follow these instructions may cause fire, explosion, asphyxiation, property damage, or personal injury.
This equipment must be used in accordance with all Federal,
State, and local regulations as well as DOT (Department of
Transportation) and CGA (Compressed Gas Association) regulations. Contact your gas supplier for more information on
the proper use of compressed gases.
Regulators must be used only with the gases and pressures for
which they are designed. Consult a safety data sheet (SDS) for
gases used to determine compatibility of gases and regulator
components (available from your gas supplier).
1. Check the designed pressure rating of the regulator (labeled or
stamped on the regulator body) and the scale range of the pressure
gauges. The pressure ratings must be adequate for the cylinder
pressure and the operating pressure.
2. Verify the materials used in the construction of the regulator are
compatible with the intended gas service.
3. Verify the regulator inlet connection is compatible with the cylinder
outlet valve connections.
4. Install a check valve purge assembly and pressure relief devices in
the operating system as required.
5. Do not interchange pressure regulators or other equipment that
was used with different gases unless you are sure the gases are
compatible.
6. Do not use regulator equipment for oxygen service that has been in
other gas service.
7. If the regulator has an open port, that port must be assembled for its
intended use.
OM-280439 Page 8
8. If gauges are used with the regulator and the regulator is UL listed,
the following requirements apply:
A. Gauges over 1,000 psi (6895 kPa) should be UL listed per UL
standard 404.
B. Gauges under 1,000 psi (6895 kPa) should be UL recognized
per UL standard 252.
9. Do not use pressure regulators in ambient temperatures below
−40˚F (−40˚C) or above 140˚F (60˚C).
Notes
OM-280439 Page 9
SECTION 6 − INSTALLATION AND OPERATION
Inspect all equipment before use. Do not use damaged, defective,
or improperly adjusted welding and cutting equipment. Make
sure levers and valves work properly, threads on equipment are
clean (no grease or oil) and not deformed, gauges are intact and
easy to read, regulator is clean and free of oil or dirt, and fittings
are properly sized for the cylinder. Make sure hoses are clean (no
grease or oil). Be sure all connections are tight and there are no
leaks in the system.
LP/Acetylene Regulator (Side Inlet)
Low Pressure
(Delivery) Gauge
High Pressure
(Supply) Gauge
Regulator Bonnet
Outlet Connection
Inlet Connection
Adjusting Handle
LP/Acetylene Regulator (Back Inlet) CGA−200, MC Type
Low Pressure
(Delivery) Gauge
Inlet Connection
Regulator Bonnet
Outlet Connection
Oxygen Regulator
(Side Inlet)
Low Pressure
(Delivery) Gauge
Regulator Bonnet
Outlet Connection
Relief Valve
Oxygen Regulator
(Back Inlet)
Low Pressure
(Delivery) Gauge
Inlet Connection
Regulator Bonnet
Outlet Connection
High Pressure
(Supply) Gauge
Adjusting Handle
High Pressure
(Supply) Gauge
Inlet Connection
Adjusting Handle
High Pressure
(Supply) Gauge
Adjusting Handle
Relief Valve
OM-280439 Page 10
1. Attach the regulator to the cylinder valve and tighten firmly with a
wrench.
2. Connect the operating system to the regulator outlet.
3. Turn the regulator adjusting handle counterclockwise until the adjusting handle turns freely (no spring load). This closes the regulator valve.
4. Close the regulator outlet valve (if used).
Do not stand in front of or behind the regulator when opening
the cylinder valve. Never open a cylinder valve suddenly as this
can damage a regulator or cause an oxygen regulator fire.
5. Slowly open the cylinder valve until the full cylinder pressure is indicated on the high pressure (supply) regulator gauge. Open the oxygen cylinder valve all the way; do not open acetylene cylinder more
than 3/4 turn. The high pressure gauge should read the cylinder
pressure. The low pressure (delivery) gauge should read zero (0).
6. With the valve at the outlet of the regulator closed and the adjusting
handle tension released, leave pressure on the inlet for 5–10 minutes. The low pressure (delivery) gauge should not indicate any
pressure increase. A pressure increase indicates gas leakage past
the regulator valve seat.
Do not use the regulator if gas leakage occurs.
7. Turn the adjusting handle clockwise to set a normal delivery pressure.
Do not use the regulator if you are unable to attain a desired
pressure or the pressure continues to rise above the set point.
8. If the unit functioned properly in the previous step, close the cylinder valve and note the readings of both the high pressure (supply)
and low pressure (delivery) pressure gauges. After 5–10 minutes, a
drop in the reading of either gauge indicates a leak in the system.
Use an approved oil-free leak detection fluid to locate possible
leaks at the inlet, any threaded port, through the regulator diaphragm or through the outlet valve. PTFE tape is an acceptable pipe thread sealant. If other sealing materials are preferred, those materials must be compatible with the gas that is
being used in the system.
9. If a leak is indicated, relieve all pressures from the regulator and
retighten the connections.
Do not use the regulator if a leak continues or is found at the
diaphragm or outlet valve.
10. If the system is determined to be leak free, turn the adjusting handle
clockwise until the desired pressure setting is indicated on the low
pressure (delivery) pressure gauge.
Do not use acetylene above 15 psi (103 kPa) flowing.
11. Open the outlet valve to purge the system. Adjust the regulator adjusting handle to obtain the desired pressure setting at the flow conditions.
NOTICE − A regulator is not intended to be used as a shut−off device.
Close the cylinder valve when system is not in use. Install a pressure relief device downstream of the regulator or outlet valve to protect the
process equipment if operating pressures rise.
OM-280439 Page 11
SECTION 7 − SYSTEM SHUTDOWN
1. Close the cylinder valve.
2. Release all gas from the regulator and/or system so that both
gauges read zero (0). Before venting the gas to the atmosphere,
render it harmless by employing a suitable disposable system.
3. Turn the adjusting handle counterclockwise until all spring load is
released.
4. Close the outlet valve (if used).
5. Disconnect the regulator.
6. If the regulator is to remain out of service, protect the inlet and outlet
fittings from dirt, contamination or mechanical damage.
7. Replace the cylinder valve cap.
SECTION 8 − PERFORMANCE
CHARACTERISTICS
The following information is intended to help you determine if the regulator is performing properly.
A. Indications Of Proper Performance
The delivery pressure drops when flow is started and/or increased.
The delivery pressure rises when flow is stopped. This difference in
delivery pressure between flow and no flow condition is called
“lockup.”
The delivery pressure of a single stage regulator increases as the
supply/cylinder pressure decays (as the cylinder is emptied). This
will not happen with a 2-stage regulator until the supply pressure
drops below the first-stage set pressure of 250 psig (1724 kPa).
The exception is 250 psig (1724 kPa) delivery range regulators,
which are set at 400 psig (2758 kPa).
B. Indications Of Improper Performance
The delivery pressure continues to rise when flow is stopped (lock−
up) without a change in adjusting-handle position. This condition
indicates valve seat wear or contamination with foreign materials
(which allows gas to leak to the delivery side). This condition is referred to as “creep.” If this condition exists, remove regulator from
service and have it repaired or replaced.
A significant drop in delivery pressure during normal flow condi-
tions indicates internal blockage. Check inlet connection filters for
contamination. If this condition exists, remove regulator from service and have it repaired or replaced.
OM-280439 Page 12
SECTION 9 − CARE AND MAINTENANCE
Periodic inspection and maintenance of the pressure regulator is
essential for continued safe and satisfactory operation. The frequency of servicing will depend on duty cycle and type of gas.
Inspect regulator monthly. If the regulator is used under normal, non-corrosive conditions, perform annual maintenance (such as removing deposits left by gas and replacing any worn or damaged parts). Inspect and
maintain the regulator more frequently if the system is subject to a high
duty cycle or is used in corrosive conditions. Regulators requiring service
repair should be sent to a Factory Authorized Service Agent.
A. Inspection
Follow these steps to inspect regulator:
1. Inspect gauges to assure they read zero (0) when all pressure is
released from the system.
2. With adjusting handle turned counterclockwise (to release all
spring tension), slowly open cylinder valve. The high pressure (supply) gauge should read cylinder pressure and the low pressure (delivery) gauge should read zero (0).
3. With valve at outlet of regulator closed and adjusting handle tension
released, leave pressure on inlet for 5–10 minutes. The low pressure
(delivery) pressure gauge should not indicate any pressure increase.
A pressure increase indicates leakage past the regulator valve seat.
If leakage is indicated, remove regulator from service and have
it repaired or replaced.
4. Turn adjusting handle clockwise to set a nominal delivery pressure.
If you are unable to attain desired pressure setting or if delivery
pressure continues to rise above set point, remove regulator from
service and have it repaired or replaced.
5. If unit functions properly in the previous step, close cylinder valve
and note the readings of both the high pressure (supply) and low
pressure (delivery) pressure gauges. After 5–10 minutes, a drop in
reading of either gauge indicates a leak in the system.
Use an approved oil-free leak detection fluid to locate possible
leaks at the inlet, any threaded port, through the regulator diaphragm, or through the outlet valve. PTFE tape is an acceptable
pipe thread sealant. If other sealing materials are preferred, those
materials must be compatible with the gas that is being used in
the system.
6. If leak is at the inlet or at a threaded port, relieve all pressure from
the regulator and then tighten. if leak continues or is found at the
diaphragm and outlet valve, remove regulator from service and
have it repaired or replaced.
B. Storage
1. Regulators taken out of service for extended periods should receive proper care to extend their service life.
2. Regulators should be wiped clean with a clean, dry, lint-free cloth
and sealed in a plastic bag for storage in a dry area at room temperature.
C. Repair Service
Any regulator in need of service should be returned to a Factory Authorized Service Agent for evaluation.
OM-280439 Page 13
SECTION 10 − WARRANTY
Warranty applies to all Hobart welding equipment with a serial
This limited warranty supersedes all previous Hobart warranties
and is exclusive with no other guarantees or warranties expressed
or implied. Hobart products are serviced by Hobart or Miller
LIMITED WARRANTY − Subject to the terms and conditions below, Hobart
Brothers Co. and Miller Electric Mfg. Co., Appleton, Wisconsin, warrants to its
original retail purchaser that new Hobart equipment sold after the effective
date of this limited warranty is free of defects in material and workmanship at
the time it is shipped by Hobart. THIS WARRANTY IS EXPRESSLY IN LIEU
OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS.
Within the warranty periods listed below, Hobart/Miller will repair or replace
any warranted parts or components that fail due to such defects in material or
workmanship. Hobart/Miller must be notified in writing within thirty (30) days
of such defect or failure, at which time Hobart/Miller will provide instructions
on the warranty claim procedures to be followed. If notification is submitted
as an online warranty claim, the claim must include a detailed description of
the fault and the troubleshooting steps taken to identify failed components
and the cause of their failure.
Hobart/Miller shall honor warranty claims on warranted equipment listed
below in the event of such a failure within the warranty time periods. All
warranty time periods start on the delivery date of the equipment to the
original retail purchaser, and not to exceed twelve months after the
equipment is shipped to a North American distributor or twelve months after
the equipment is shipped to an International distributor.
1 Year — Parts and Labor Unless Specified
(90 days for industrial use)
* Flowgauge and Flowmeter Regulators (No Labor)
* Regulators
Hobart’s warranty shall not apply to:
Equipment that has been modified by any party other than
Hobart/Miller, or equipment that has been improperly installed,
improperly operated or misused based upon industry standards, or
equipment which has not had reasonable and necessary
maintenance, or equipment which has been used for operation
outside of the specifications for the equipment.
HOBART PRODUCTS ARE INTENDED FOR PURCHASE AND USE BY
COMMERCIAL/INDUSTRIAL USERS AND PERSONS TRAINED AND
EXPERIENCED IN THE USE AND MAINTENANCE OF WELDING
EQUIPMENT.
In the event of a warranty claim covered by this warranty, the exclusive
remedies shall be, at Hobart’s/Miller’s option: (1) repair; or (2) replacement;
or, where authorized in writing by Hobart/Miller in appropriate cases, (3) the
reasonable cost of repair or replacement at an authorized Hobart/Miller
service station; or (4) payment of or credit for the purchase price (less
reasonable depreciation based upon actual use) upon return of the goods at
customer’s risk and expense. Hobart’s/Miller’s option of repair or
replacement will be F.O.B., Factory at Appleton, Wisconsin, or F.O.B. at a
Hobart/Miller authorized service facility as determined by Hobart/Miller.
Therefore no compensation or reimbursement for transportation costs of any
kind will be allowed.
Effective January 1, 2017
number preface of MH or newer.
Authorized Service Agencies.
OM-280439 Page 14
TO THE EXTENT PERMITTED BY LAW, THE REMEDIES PROVIDED
HEREIN ARE THE SOLE AND EXCLUSIVE REMEDIES. IN NO EVENT
SHALL HOBART/MILLER BE LIABLE FOR DIRECT, INDIRECT, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING LOSS OF
PROFIT), WHETHER BASED ON CONTRACT, TORT OR ANY OTHER
LEGAL THEORY.
ANY EXPRESS WARRANTY NOT PROVIDED HEREIN AND ANY
IMPLIED WARRANTY, GUARANTY OR REPRESENTATION AS TO
PERFORMANCE, AND ANY REMEDY FOR BREACH OF CONTRACT
TORT OR ANY OTHER LEGAL THEORY WHICH, BUT FOR THIS
PROVISION, MIGHT ARISE BY IMPLICATION, OPERATION OF LAW,
CUSTOM OF TRADE OR COURSE OF DEALING, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
PARTICULAR PURPOSE, WITH RESPECT TO ANY AND ALL
EQUIPMENT FURNISHED BY HOBART/MILLER IS EXCLUDED AND
DISCLAIMED BY Hobart/Miller.
Some states in the U.S.A. do not allow limitations of how long an implied
warranty lasts, or the exclusion of incidental, indirect, special or
consequential damages, so the above limitation or exclusion may not apply
to you. This warranty provides specific legal rights, and other rights may be
available, but may vary from state to state.
In Canada, legislation in some provinces provides for certain additional
warranties or remedies other than as stated herein, and to the extent that
they may not be waived, the limitations and exclusions set out above may not
apply. This Limited Warranty provides specific legal rights, and other rights
may be available, but may vary from province to province.
Ref. Hobart_warr 2017−01
Notes
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Notes
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Notes
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Notes
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OM-262 659 Página 19
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Hobart Brothers Co.
An Illinois Tool Works Company
1635 West Spencer Street
Appleton, WI 54914 USA
Phone: 800-332-3281
Visit our website at
www.HobartWelders.com
ORIGINAL INSTRUCTIONS 2017 Hobart Welders. 2017−07
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