INSTRUCTIONS for
F-9082-H
October, 2000
H-11 & H-12
HYDRAULIC BACK-PRESSURE VALVES
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of operation and safe
practices for oxy-fuel gas equipment, we urge you to read our booklet "Precautions and Safe Practices for Gas Welding, Cutting
and Heating," Form 2035. Do NOT permit untrained persons to operate this equipment. Do NOT attempt to operate this equipment until you have read and fully understand these Instructions. If you do not fully understand these Instructions, contact your
supplier for further information.
The hydraulic valves covered by these Instructions are listed by Underwriter's Laboratories only when using parts manufactured
by ESAB Welding & Cutting Products to the specifications on file with Underwriter's Laboratories, Inc., and when they are used in
the gas service for which they are designed and listed. The use of other parts that cause damage or failure to the equipment will
void the manufacturer's warranty.
INTRODUCTION
The H-1 1 and H-12 are triple-tube constructed hydraulic back-pressure valves (commonly called "hydraulics")
designed for station or main line use. The H-11 is for
acetylene use only . The suffix 6M indicates the capacity of 6000 cubic feet per hour (cfh) at an inlet pressure of 15 psi. The H-11 is equipped with the RV-28
relief valve which can be adjusted to relieve pressures
The H-12 is for use with any fuel gas except acetylene, which are available in two different operating pressure ratings. Like the H-11, one is equipped with the
RV-28 relief valve with maximum operating pressure
of 15 psi. The other is rated to operate up to 100 psi.
It is equipped with the 22X56 relief valve which can be
set to relieve at pressures from 50 to 125 psi.
from 10 to 20 psi.
Table 1 - Specifications
Hydraulic Liquid Maximum Recommended Gas Flow Rate Capacity
Back-Pressure Capacity @ Various Inlet Pressures in Cubic Feet per Hour*.
Valve Relief pints 3 psi 5 psi 10 psi 15 psi 25 psi 50 psi 75 psi 100 psi
Model Part No. V alve (liters) (0.2 bars) (0.35 bars) (0.7 bars) (1.0 bars) (1.7 bars) (3.5 bars) (5.2 bars) (6.9 bars)
For Acetylene
H-11-6M 06P53 (11P63) 8.5 (4.0) 3600 4000 5000 6000 — — — —
For Fuel Gases other than Acetylene
F-9082-H
H-12-6M 11P98 (11P63) 8.5 (4.0) 3600 4000 5000 6000 — — — —
H-12-6M 09P70 22X56 8.5 (4.0) 3600 4000 5000 6000 8000 13000 18000 23000
* To convert cubic feet per hour (CFH) to cubic meters per hour (m3/h), multiply the given flow rates by 0.0283.
RV-28
RV-28
Be sure this information reaches the operator.
You can get extra copies through your supplier.
SAFETY PRECAUTIONS
These Safety Precautions are for your protection. They summarize precautionary information from the references listed
in Additional Safety Information section. Before performing any
installation or operating procedures, be sure to read and follow the safety precautions listed below as well as all other
manuals, material safety data sheets, labels, etc. Failure to observe Safety Precautions can result in injury or death.
PROTECT YOURSELF AND OTHERS - Some
welding, cutting and gouging processes are
noisy and require ear protection. Hot metal can
cause skin burns and heat rays may injure
eyes. Training in the proper use of the processes and equipment is essential to prevent
accidents. Also:
1. Always wear safety glasses with side shields in any work area,
even if welding helmets, face shields, or goggles are also required.
2. Wear flameproof gauntlet type gloves, heavy long-sleeve shirt,
cuffless trousers, high-topped shoes, and a welding helmet or
cap for hair protection, to protect against hot sparks and hot
metal. A flameproof apron may also be desirable as protection
against radiated heat and sparks.
3. Hot sparks or metal can lodge in rolled up sleeves, trousers
cuffs, or pockets. Sleeves and collars should be kept buttoned,
and open pockets eliminated from the front of clothing.
4. Protect other personnel from hot sparks with a suitable nonflammable partition or curtains.
5. Use goggles over safety glasses when chipping slag or grinding. Chipped slag may be hot and can travel considerable distances. Bystanders should also wear goggles over safety
glasses.
FIRES AND EXPLOSIONS - Heat from a flame
can act as an ignition source. Hot slag or sparks
can also cause fires or explosions. Therefore:
1. Remove all combustible materials well away from the work
area or completely cover the materials with a protective nonflammable covering. Combustible materials include wood,
cloth, sawdust, liquid and gas fuels, solvents, paints and coatings, paper, etc.
2. Hot sparks or hot metal can fall through cracks or crevices in
floors or wall openings and cause a hidden smoldering fire on
the floor below. Make certain that such openings are protected
from hot sparks and metal.
3. Do not weld, cut, or perform any other hot work on materials,
containers, or piping until it has been completely cleaned so
that no substances on the material can produce flammable or
toxic vapors. Do not do hot work on closed containers. They
may explode.
4. Have fire extinguishing equipment handy for instant use, such
as a garden hose, a pail of water or sand, or portable fire
extinguisher. Be sure you are trained in its use.
5. After completing operations, inspect the work area to be sure
that there are no hot sparks or hot metal which could cause a
later fire. Use fire watchers when necessary.
6. For additional information, refer to NFPA Standard 51B, Fire
Prevention in Use of Cutting and Welding Processes, which
is available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
FUMES AND GASES - Fumes and gases, particularly in confined spaces, can cause discomfort or injury. Do not breathe fumes or
gases from welding or cutting, Therefore:
1. Always provide adequate ventilation in the work area by natural or mechanical ventilation means. Do not weld, cut, or gouge
on materials such as galvanized steel, stainless steel, copper,
zinc, lead, beryllium, or cadmium unless positive mechanical
ventilation is provided. Do not breathe fumes and gases from
these materials.
2. If you develop momentary eye, nose, or throat irritation while
operating, this is an indication that ventilation is not adequate.
Stop work at once and take necessary steps to improve ventilation in the work area. Do not continue to operate if physical
discomfort persists.
3. Refer to ANSI/ASC Standard Z49.1 listed below for specific
ventilation recommendations.
4. WARNING: This product, when used for welding or
1. Always have qualified personnel perform the installation,
troubleshooting, and maintenance work. Do not operate or
repair any equipment unless you are qualified to do so.
2. Keep all oxy-fuel equipment free of grease or oil. Grease, oil,
and other similar combustible materials, when ignited, can burn
violently in the presence of oxygen.
3. Do not abuse any equipment or accessories. Keep equipment
away from heat and wet conditions, oil or grease, corrosive
atmospheres and inclement weather.
4. Keep all safety devices in position and in good repair.
5. Use equipment for its intended purpose. Do not modify it in
any manner.
1. Use the proper gas for the process and use the proper pressure reducing regulator designed to operate from the compressed gas cylinder. Do not use adaptors to mount the regulator on the cylinder. Maintain hoses and fittings in good condition. Follow manufacturer s operating instructions for mounting the regulator to the gas cylinder.
2. Always secure cylinders in an upright position by chain or strap
to suitable hand trucks, benches, walls, post, or racks. Never
secure cylinders to work tables or fixtures where they may
become part of an electrical circuit.
3. When not in use, keep cylinder valves closed. Have the valve
protection cap in place on top of the cylinder if no regulators is
installed. Secure and move cylinders by using suitable hand
trucks. Avoid rough handling of cylinders.
4. Locate cylinders away from heat, sparks, or flame of a welding, cutting, or gouging operation. Never strike an arc on a
cylinder.
5. For additional information, refer to CGA Standard P-1, Precautions for Safe Handling of Compressed Gases in Cylinders:, which is available from the Compressed Gas Association, 1235 Jefferson Davis Highway, Arlington, VA 22202.
The following publications, which are available from the American
Welding Society, 550 N.W. LeJuene Road, Miami, FL 33126, are
recommended to you:
1. ANSI/AWS Z49.1 - Safety in Welding and Cutting.
2. AWS F4.1 - Recommended Safe Practices for the Preparation for Welding and Cutting of Containers and Piping That
Have Held Hazardous Substances/
3. AWS SP - Safe Practices - Reprint, Welding Handbook.
cutting, 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 §25249.5 et seq.)
EQUIPMENT MAINTENANCE - Faulty or improperly maintained equipment, such as torches, hoses
and regulators, can result in poor work, but even
more important, it can cause injury or death
through fires. Therefore:
GAS CYLINDER HANDLING - Gas cylinders, if mishandled, can rupture or explode violently. Sudden
rupture of a cylinder, valve or relief device can injure or kill you. Therefore:
ADDITIONAL SAFETY INFORMATION - For more
information on safe practices for oxy-fuel welding
and cutting equipment, ask your distributor for a
copy of Precautions and Safe Practices for Gas
Welding, Cutting, and Heating, Form 2035. Gas
apparatus safety guidelines are also available on
video cassettes from your distributor.
MEANING OF SYMBOLS - As used throughout
this manual: Means Attention! Be Alert! Your
safety is involved.
Means immediate hazards which, if not avoided,
will result in immediate, serious personal in-
jury or loss of life.
Means potential hazards which could result in
personal injury or loss of life.
Means hazards which could result in minor
personal injury.
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SP-GA 10/98
IMPORT ANT: In addition to this booklet (F-9082) you
will find another booklet "Cold Weather
Care for Acetylene Generating and Distributing Equipment" (F-3088) packed
with your hydraulic back-pressure valve.
Although it deals primarily with the installation and maintenance of acetylene
equipment, the information also applies
to similar equipment for use with fuel
gases other than acetylene. You are
urged to read it carefully before attempting to install your hydraulic back-pressure valve.
INSTALLATION
VENT PIPE
This pipe must be galvanized and have galvanized fittings. It must be at least 3/4-in. in diameter. A 3/4-in.
street elbow (galvanized) should be used to connect
the vent pipe to the outlet on the side of the relief valve.
The vent pipe must extend to the outside of the building and terminate not less than 12-ft. above the ground,
remote from windows or openings in the building, and
as far as possible from sources of ignition such as flues
or chimneys. Its end must be fitted with a return bend
or elbow opening downward, preferably screened to
prevent obstructions. The vent pipe must be installed
without traps so that any liquid or condensation will
drain back to the hydraulic. Where used for station
outlet service, the vent pipes from two or more hydraulics supplied through a common branch of the service
line may be connected to a common vent pipe header.
Where installed in the service piping system for branch
line service, the vent line from each hydraulic must be
run separately to the outside of the building.
TO INSTALL HYDRAULIC
IMPORTANT: Before connecting the hydraulic to a
supply line which has previously contained gas, the supply line must first be
isolated (completely shut off) from the
source of gas supply, vented, and then
purged of all traces of gas. Nitrogen or
carbon dioxide should be used for purging.
1. Install the hydraulic in a true vertical position as
illustrated in Fig. 1. Allow at least 15-in. between
drain plug and floor so that plug and screen assembly can be removed when necessary .
2. Make up the necessary gas connections between
the hydraulic service outlet tee and the inlet connection on the apparatus to which gas is to be supplied. If this connecting gas line is of considerable
length, a shutoff valve should also be provided near
the hydraulic service outlet.
3. Remove the liquid-filling plug and the liquid-level
plug. Fill the hydraulic with automotive type, ethylene glycol anti-freeze through the filling plug opening, until there is an overflow from either the liquidlevel opening or the filling plug opening. Reinstall
the plugs.
4. Open the service valve at the hydraulic outlet and
close the fuel gas supply valve at the consuming
device. Open the station shutoff valve and any
other valves on the supply line serving the hydraulic to fill the hydraulic and the newly installed service connection piping with the fuel gas at working
pressure.
5. Test all joints for leaks on the hydraulic and service connecting piping. These should include the
hydraulic filling plug and outlet connections. Use
soapy water and maintain operating pressure in
the hydraulic and service connection piping. Never
test for leaks with an open flame. Eliminate all
leaks before putting the hydraulic into service.
OPERATION
FILLING THE HYDRAULIC
First close the station shutoff valve and the hydraulic
outlet valve. Operate the relief valve to vent any gas
pressure in the hydraulic through the vent pipe. Remove the liquid-level plug. Fill through the filling plug
opening until there is an overflow from either the liquid-level or filling plug opening. Replace the plugs.
The liquid level should be checked regularly, and the
correct level maintained at all times.
CHECKING THE LIQUID LEVEL
The frequency with which the level should be checked
depends upon the conditions of service and the liquid
used in the hydraulic. If the hydraulic is used for a dry
gas, use concentrated or undiluted anti-freeze unless
the hydraulic may be exposed to temperatures below
o
5
F. Where anti-freeze protection at lower temperatures must be provided, use a water solution of antifreeze as directed in the booklet "Cold Weather Care
of Acetylene Generating and Distributing Equipment,"
(Form 3088) which is packed with this hydraulic.
If the hydraulic is used for a fuel gas that contains a
considerable amount of water vapor, it is desirable to
have a solution which will neither absorb, nor give up,
any moisture as the gas passes through it. Such solution is said to be in "equilibrium" with the gas and reduces the necessity of frequently checking liquid levels. Full instructions for obtaining the correct concentration are given in F-3088.
If a flashback occurs, check the liquid level immediately. Before resuming service, make sure that the
liquid is at the correct level. Refill the hydraulic if necessary.
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