MVP HVDG-2000 User manual

High Volume 1:1 Pro Gun
Operations Manual
This manual is applicable to the
following models:
 HVDG-2000
 HVDG-2000-DR
 HVDG-2000-R
 HVDG-2000-TM
 HVDG-4000
 HVDG-4000-EP
Rev. March 2019

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CORPORATE HEADQUARTERS
2030 Falling Waters Rd, Suite 350, Knoxville, TN 37922 · USA · Tel: [phone]
DISTRIBUTION AND PURCHASING
642 Barbrow Ln, Knoxville, TN 37932 · USA · Tel: [phone]
TECHNOLOGY CENTER AND MANUFACTURING
1862 Ives Ave, Kent, WA 98032 · USA · Tel [phone] · Fax [phone]
E-mail: [email protected]om
For a list of international distributors, visit our website at :
www.mvpind.com/mvp-international
Use of this product co nfirms that Magnum Venus Products, Inc.’s standard terms and
conditions of sale apply.

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Table of Contents
Section Page
 Table of Contents 3
 Safety & Warning Information 4
 Introduction 15
 Disassembling Gun 16
 Disassembling Gun Block 17
 Assembling Gun Block 21
 Rebuilding Actuator 25
 Parts Drawings 25

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Safety & Warning Information
Warnings
Due to the vast number of chemicals that could be used and their varying chemical reactions, the
buyer and user of this equipment should determine all factors relating to the fluids used, including
any of the potential hazards involved. Particular inquiry and investigation should be made into
potential dangers relating to toxic fumes, fires, explosions, reaction times, and exposure of
human beings to the individual components or their resultant mixtures. MVP assumes no
responsibility for loss, damage, expense or claims for bodily injury or property damage, direct or
consequential, arising from the use of such chemical components.
The end user is responsible for ensuring that the end product or system complies with all the
relevant laws in the country where it is to be used and that all documentation is adhered to.
Recommended Occupational Safety & Health Act (OSHA) Documentation:
 1910.94 Pertaining to ventilation
 1910.106 Pertaining to flammable liquids
 1910.107
Pertaining to spray finishing operations, particularly paragraph (m),
Organic Peroxides and Dual Component Coatings
For Additional information, contact the Occupational Safety and Health Administration (OSHA)
at https://www.osha.gov/about.html.
Recommended National Fire Protection Association (NFPA) Documentation:
 NFPA No.33 Chapter 14 Organic Peroxides and Dual Component Materials
 NFPA No. 63 Dust Explosion Prevention
 NFPA No. 70 National Electrical Code
 NFPA No. 77 Static Electricity
 NFPA No. 91 Blower and Exhaust System
 NFPA No. 654 Plastics Industry Dust Hazards
Fire Extinguisher – code ABC, rating number 4a60bc using Extinguishing Media –Foam,
Carbon Dioxide, Dry Chemical, Water Fog, is recommended for this product and applications.
The following general warnings and guidelines are for the setup, use, grounding, maintenance,
and repair of equipment. Additional product-specific warnings may be found throughout this
manual as applicable. Please contact your nearest MVP Technical Service Representative if
additional information is needed.

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Safety Precautions
 Avoid skin contact and inhalation of all chemicals.
 Review Material Safety Data Sheet (MSDS) to promote the safe handling of chemicals in
use.
 Restrict the use of all chemicals to designated areas with good ventilation.
 Chemicals are flammable and reactive.
 Noxious fumes released when combusted.
 Operate equipment in a ventilated environment only.
 Uncured liquid resins are highly flammable unless specifically labeled otherwise.
 Cured laminate, accumulations of overspray, and laminate sandings are highly combustible.
 Do not operate or move electrical equipment when flammable fumes are present.
 Ground all equipment.
 If a spark is seen or felt, immediately halt operation. Do not operate the equipment until the
issue has been identified and repaired.
 Contaminated catalyst may cause fire or explosion.
 Containers may explode if exposed to fire / heat.
 Use and store chemicals away from heat, flames, and sparks.
 Do not smoke in work areas or near stored chemicals.
 Do not mix Methyl Ethyl Ketone Peroxide (MEKP) with materials other than polyethylene.
 Do not dilute MEKP.
 Keep food and drink away from work area.

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Physical Hazards
 Never look directly into the spray gun fluid tip. Serious injury or death can result.
 Never aim the spray gun at or near another person. Serious injury or death can result.
 Chemical compounds can be severely irritating to the eyes and skin.
 Inhalation, ingestion, or injection may damage internal organs and lead to pulmonary disorders, cancers,
lymphomas, and other diseases or health conditions.
 Other potential health effects include: irritation of the eyes and upper respiratory tract, headache, light-
headedness, dizziness, confusion, drowsiness, nausea, vomiting, and occasionally abdominal pain.
 Eye contact: Immediately flush with water for at least 15 minutes and seek immediate medical attention.
 Skin Contact: Immediately wash with soap and water and seek immediate medical attention.
 Inhalation: Move the person to fresh air and seek immediate medical attention.
 Do not remove shields, covers, or safety features on equipment that is in use.
 Never place fingers, hands, or any body part near or directly in front of the spray gun fluid tip. The force
of the liquid as it exits the spray tip can shoot liquid through the skin.
 Keep hands and body parts away from any moving equipment or components.
 Do not stand under plunger
 An improperly loaded drum may lead to an imbalance, causing a unit to tip over
Personal Protective Equipment (PPE)
 MVP recommends the use of personal safety equipment with all products in our catalog.
 Wear safety goggles, hearing protection, a respirator, and chemical resistant gloves.
 Wear long sleeve shirts or jackets and pants to minimize skin exposure.
 PPE should be worn by operators and service technicians to reduce the risk of injury.
For Additional information, contact the Occupational Safety and Health Administration
(OSHA). https://www.osha.gov/about.html

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Symbol Definitions
Indicates the risk of
contact with chemicals
that are hazardous, which
may lead to injury or
death.
Indicates the risk of
contact with voltage /
amperage that may lead
to serious injury or death
Indicates that the
materials being used are
susceptible to combustion
Indicates the risk of
contact with moving
components that may
lead to serious injury or
death.
Indicates that the system
or component should be
grounded before
proceeding with use or
repair.
Indicates the use of lit
cigarettes or cigars is
prohibited, because the
materials being used are
susceptible to
combustion.
Indicates that the
materials and/or the
process being performed
can lead to ignition and
explosion.
A recommendation for
the use of Personal
Protective Equipment
(PPE) before using or
repairing the product.

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Polymer Matrix Materials: Advanced Composites
Potential health hazards associated with the use of advanced composites can be controlled through
the implementation of an effective industrial hygiene and safety program.
https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_1.html#t iii:1_1
Resins
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Epoxy resins Skin, lungs, eyes Contact and allergic dermatitis,
conjunctivitis
Polyurethane resins Lungs, skin, eyes Respiratory sensitization, contact
dermatitis, conjunctivitis
Phenol formaldehyde Skin, lungs, eyes As above (potential carcinogen)
Bismaleimides (BMI) Skin, lungs, eyes As above (potential carcinogen)
Polyamides Skin, lungs, eyes As above (potential carcinogen)
Reinforcing materials
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Aramid fibers Skin (lungs) Skin and respiratory irritation, contact
dermatitis (chronic interstitial lung disease)
Carbon/graphite fibers Skin (lungs) As noted for aramid fibers
Glass fibers (continuous
filament) Skin (lungs) As noted for aramid fibers
Hardeners and curing agents
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Diaminodiphenylsulfone N/A No known effects with workplace
exposure
Methylenedianiline Liver, skin Hepatotoxicity, suspect human carcinogen
Other aromatic amines
Composite Component Organ System Target
(Possible Target)
Known (Possible) Health Effect
Meta-phenylenediamine (MPDA) Liver, skin (kidney,
bladder)
Hepatitis, contact dermatitis (kidney and
bladder cancer)
Aliphatic andcyclo-aliphatic
amines
Eyes, skin Severe irritation, contact dermatitis
Polyaminoamide Eyes, skin Irritation (sensitization)
Anhydride Eyes, lungs, skin Severe eye and skin irritation, respiratory
sensitization, contact dermatitis

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Catalyst - Methyl Ethyl Ketone Peroxide (MEKP)
MEKP is among the more hazardous materials found in commercial channels. The safe handling
of the “unstable (reactive)” chemicals presents a definite challenge to the plastics industry. The
highly reactive property which makes MEKP valuable to the plastics industry in producing the
curing reaction of polyester resins also produces the hazards which require great care and caution
in its storage, transportation, handling, processing and disposal. MEKP is a single chemical.
Various polymeric forms may exist which are more or less hazardous with respect to each other.
These differences may arise not only from different molecular structures (all are, nevertheless,
called “MEKP”) and from possible trace impurities left from the manufacture of the chemicals, but
may also arise by contamination of MEKP with other materials in its storage or use. Even a small
amount of contamination with acetone, for instance, may produce an extremely shock-sensitive
and explosive compound.
WARNING
Contamination with promoters, materials containing promoters (such as
laminate sandings), or with any readily oxidizing material (such as brass or
iron) will cause exothermic redox reactions which can be explosive in
nature. Heat applied to MEKP or heat buildup from contamination reactions
can cause the material to reach its Self-Accelerating Decomposition
Temperature (SADT).
Researchers have reported measuring pressure rates-of-rise well over 100,000 psi per second when
certain MEKP’s reach their SADT. For comparison, the highest-pressure rate-of-rise listed in
NFPA Bulletin NO.68, “Explosion Venting”, is 12,000 psi per second for an explosion of 12%
acetylene and air. The maximum value listed for a hydrogen explosion is 10,000 psi per second.
Some forms of MEKP, if allowed to reach their SADT, will burst even an open topped container.
This suggests that it is not possible to design a relief valve to vent this order of magnitude of
pressure rate-of-rise. The user should be aware that any closed container, be it a pressure vessel,
surge chamber, or pressure accumulator, could explode under certain conditions. There is no
engineering substitute for care by the user in handling organic peroxide catalysts. If, at any time,
the pressure relieve valve on top of the catalyst tank should vent, the area should be evacuated at
once and the fire department called. The venting could be the first indication of a heat, and
therefore, pressure build-up that could eventually lead to an explosion. Moreover, if a catalyst
tank is sufficiently full when the pressure relief valve vents, some catalyst may spray out, which
could cause eye injury. For this reason, and many others, anyone whose job puts them in an area
where this vented spray might go, should always wear full eye protection even when laminating
operations are not taking place.
Safety in handling MEKP depends to a great extent on employee education, proper safety
instructions, and safe use of the chemicals and equipment. Workers should be thoroughly
informed of the hazards that may result from improper handling of MEKP, especially regarding
contamination, heat, friction and impact. They should be thoroughly instructed regarding the
proper action to be taken in the storage, use, and disposal of MEKP and other hazardous
materials used in the laminating operation. In addition, users should make every effort to:
 Store MEKP in a cool, dry place in original containers away from direct sunlight and away
from other chemicals.
 Keep MEKP away from heat, sparks, and open flames.
 Prevent contamination or MEKP with other materials, including polyester over spray and
sandings, polymerization accelerators and promoters, brass, aluminum, and non-stainless
steels.

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 Never add MEKP to anything that is hot, since explosive decomposition may result.
 Avoid contact with skin, eyes, and clothing. Protective equipment should be worn at all
times. During clean-up of spilled MEKP, personal safety equipment, gloves, and eye
protection must be worn. Firefighting equipment should be at hand and ready.
 Avoid spillage, which can heat up to the point of self-ignition.
 Repair any leaks discovered in the catalyst system immediately, and clean-up the leaked
catalyst at once in accordance with the catalyst manufacturer’s instructions.
 Use only original equipment or equivalent parts from Magnum Venus Products in the catalyst
system (i.e.: hoses, fitting, etc.) because a dangerous chemical reaction may result between
substituted parts and MEKP.
 Catalyst accumulated from the purging of hoses or the measurement of fluid output
deliveries should never be returned to the supply tank, such catalyst should be diluted with
copious quantities of clean water and disposed of in accordance with the catalyst
manufacturer’s instructions.
The extent to which the user is successful in accomplishing these ends and any additional
recommendations by the catalyst manufacturer determines largely the safety that will be present
in his operation.
Clean-Up Solvents and Resin Diluents
WARNING
A hazardous situation may be present in your pressurized fluid system! Hydro
carbon solvents can cause an explosion when used with aluminum or
galvanized components in a closed (pressurized) fluid system (pump,
heaters, filters, valves, spray guns, tanks, etc.). An explosion could cause
serious injury, death, and/or substantial property damage. Cleaning agents,
coatings, paints, etc. may contain Halogenated Hyrdrocarbon solvents. Some
Magnum Venus Products spray equipment includes aluminum or galvanized
components and will be affected by Halogenated Hydrocarbon solvents.
There are three key elements to the Halogenated Hyrdocarbon (HHC) solvent hazard.
1. The presence of HHC
solvents.
1,1,1 – Trichloroethane and Methylene Chloride are the most common of
these solvents. However, other HHC solvents are suspect if used; either
as part of paint or adhesives formulation, or for clean-up flushing.
2. Aluminum or
Galvanized Parts.
Most handling equipment contains these elements. In contact with
these metals, HHC solvents could generate a corrosive reaction of a
catalytic nature.
3. Equipment capable of
withstanding pressure.
When HHC solvent contact aluminum or galvanized parts inside a
closed container such as a pump, spray gun, or fluid handling system,
the chemical reaction can, over time, result in a build-up of heat and
pressure, which can reach explosive proportions. When all three
elements are present, the result can be an extremely violent explosion.
The reaction can be sustained with very little aluminum or galvanized
metal; any amount of aluminum is too much.

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 The reaction is unpredictable. Prior use of an HHC solvent without incident (corrosion or
explosion) does NOT mean that such use is safe. These solvents can be dangerous alone (as a
clean-up or flushing agent) or when used as a component or a coating material. There is no
known inhibitor that is effective under all circumstances. Mixing HHC solvents with other
materials or solvents such as MEKP, alcohol, or toluene may render the inhibitors ineffective.
 The use of reclaimed solvents is particularly hazardous. Reclaimers may not add any inhibitors.
The possible presence of water in reclaimed solvents could also feed the reaction.
 Anodized or other oxide coatings cannot be relied upon to prevent the explosive reaction. Such
coatings can be worn, cracked, scratched, or too thin to prevent contact. There is no known way
to make oxide coatings or to employ aluminum alloys to safely prevent the chemical reaction
under all circumstances.
 Several solvent suppliers have recently begun promoting HHC solvents for use in coating
systems. The increasing use of HHC solvents is increasing the risk. Because of their exemption
from many state implementation plans as Volatile Organic Compounds (VOCs), their low
flammability hazard, and their not being classified as toxic or carcinogenic substances, HHC
solvents are very desirable in many respects.
WARNING
Do not use Halogenated Hydrocarbon (HHC) solvents in pressurized fluid
systems having aluminum or galvanized wetted parts.
Magnum Venus Products is aware of NO stabilizers available to prevent HHC
solvents from reaction under all conditions with aluminum components in
closed fluid systems. HHC solvents are dangerous when used with aluminum
components in a closed fluid system.
 Consult your material supplier to determine whether your solvent or coating contains
Halogenated Hydrocarbon solvents.
 Magnum Venus Products recommends that you contact your solvent supplier regarding the best
non-flammable clean-up solvent with the heat toxicity for your application.
 If, however, you find it necessary to use flammable solvents, they must be kept in approved,
electrically grounded containers.
 Bulk solvent should be stored in a well-ventilated, separate building, 50 feet away from your main
plant.
 You should only allow enough solvent for one day’s use in your laminating area.
 NO SMOKING signs must be posted and observed in all areas of storage or where solvents and
other flammable materials are used.
 Adequate ventilation (as covered in OSHA Section 1910.94 and NFPA No.91) is important
wherever solvents are stored or used, to minimize, confine and exhaust the solvent vapors.
 Solvents should be handled in accordance with OSHA Section 1910.106 and 1910.107.

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Catalyst Diluents
Magnum Venus Products spray-up and gel-coat systems currently produced are designed so that
catalyst diluents are not required. Magnum Venus Products therefore recommends that diluents
not be used to avoid possible contamination which could lead to an explosion due to the handling
and mixing of MEKP and diluents. In addition, it eliminates any problems from the diluent being
contaminated through rust particles in drums, poor quality control on the part of the diluents
suppliers, or any other reason. If diluents are absolutely required, contact your catalyst supplier
and follow his instructions explicitly. Preferably the supplier should premix the catalyst to prevent
possible “on the job” contamination while mixing.
WARNING
If diluents are not used, remember that catalyst spillage and gun, hose,
and packing leaks are potentially more hazardous since each drop
contains a higher concentration of catalyst and will therefore react more
quickly with overspray and the leak.
Cured Laminate, Overspray and Laminate Sandings Accumulation
 Remove all accumulations of overspray, Fiberglass Reinforced Plastic (FRP) sandings, etc. from
the building as they occur. If this waste is allowed to build up, spillage of catalyst is more likely to
start a fire; in addition, the fire would burn hotter and longer.
 Floor coverings, if used, should be non-combustible.
 Spilled or leaked catalyst may cause a fire if it comes in contact with an FRP product, over-
sprayed chop or resin, FRP sandings or any other material with MEKP.
To prevent spillage and leakage, you should:
1. Maintain your Magnum Venus
Products System.
Check the gun several times daily for catalyst and
resin packing or valve leaks. REPAIR ALL LEAKS
IMMEDIATELY.
2. Never leave the gun hanging over
or lying inside the mold.
A catalyst leak in this situation would certainly
damage the part, possibly the mold, and may cause
a fire.
3. Inspect resin and catalyst hoses
daily for wear or stress at the entry
and exits of the boom sections and
at the hose and fittings.
Replace if wear or weakness is evident or
suspected.
4. Arrange the hoses and fiberglass
roving guides so that the fiberglass
strands DO NOT rub against any of
the hoses at any point.
If allowed to rub, the hose will be cut through,
causing a hazardous leakage of material which
could increase the danger of fire. Also, the material
may spew onto personnel in the area.

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Toxicity of Chemicals
 Magnum Venus Products recommends that you consult OSHA Sections 1910.94, 1910.106,
1910.107 and NFPA No.33, Chapter 14, and NFPA No.91.
 Contact your chemical supplier(s) and determine the toxicity of the various chemicals used as
well as the best methods to prevent injury, irritation and danger to personnel.
 Also determine the best methods of first aid treatment for each chemical used in your plant.
Equipment Safety
Magnum Venus Products suggest that personal safety equipment such as EYE GOGGLES,
GLOVES, EAR PROTECTION, and RESPIRATORS be worn when servicing or operating this
equipment. Ear protection should be worn when operating a fiberglass chopper to protect against
hearing loss since noise levels can be as high as 116 dB (decibels). This equipment should only be
operated or serviced by technically trained personnel!
CAUTION
Never place fingers, hands, or any body part near or directly in front of the
spray gun fluid tip. The force of the liquid as it exits the spray tip can cause
serious injury by shooting liquid through the skin. NEVER LOOK DIRECTLY
INTO THE GUN SPRAY TIP OR POINT THE GUN AT OR NEAR ANOTHER
PERSON OR AN ANIMAL.
DANGER
Contaminated catalyst may cause fire or explosion. Before working on the
catalyst pump or catalyst accumulator, wash hands and tools thoroughly.
Be sure work area is free from dirt, grease, or resin. Clean catalyst system
components with clean water daily.
DANGER
Eye, skin, and respiration hazard. The catalyst MEKP may cause blindness,
skin irritation, or breathing difficulty. Keep hands away from face. Keep
food and drink away from work area.
Treatment of Chemical Injuries
CAUTION
Refer to your catalyst manufacturer’s safety information regarding the safe
handling and storage of catalyst. Wear appropriate safety equipment as
recommended.
Great care should be used in handling the chemicals (resins, catalyst and solvents) used in polyester
systems. Such chemicals should be treated as if they hurt your skin and eyes and as if they are
poison to your body. For this reason, Magnum Venus Products recommends the use of protective
clothing and eye wear in using polyester systems. However, users should be prepared in the event of
such an injury.

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Precautions include:
1. Know precisely what chemicals you are using and obtain information from your chemical
supplier on what to do in the event the chemical gets onto your skin or into the eyes, or if
swallowed.
2. Keep this information together and easily available so that it may be used by those
administering first aid or treating the injured person.
3. Be sure the information from your chemical supplier includes instructions on how to treat
any toxic effects the chemicals have.
WARNING
Contact your doctor immediately in the event of an injury. If the product’s
MSDS includes first aid instructions, administer first aid immediately after
contacting a doctor.
Fast treatment of the outer skin and eyes that contact chemicals generally includes immediate
and thorough washing of the exposed skin and immediate and continuous flushing of the eyes
with lots of clean water for at least 15 minutes or more. These general instructions of first aid
treatment may be incorrect for some chemicals; you must know the chemicals and treatment
before an accident occurs. Treatment for swallowing a chemical frequently depends upon the
nature of the chemical.
Emergency Stop Procedure
In an emergency, follow these steps to stop a system:
1. The ball valve located where the air enters the power head of the resin pump, should be moved to
the “OFF” or closed position.
Note The “open” or “on” position is when the ball valve handle is parallel (in line) with
the ball valve body. The “closed” or “off” position is when the ball valve handle
is perpendicular (across) the ball valve body.
2. Turn all system regulators to the “OFF” position (counter-clockwise) position.
3. Verify / secure the catalyst relief line, located on the catalyst relief valve.
4. Verify / secure the resin return line, located on the resin filter.
5. Place a container under the resin pump ball valve to catch ejected resin.
6. Locate the ball valve on the resin pump.
7. Rotate the ball valve 90 degrees to the “On” or open position.
Grounding
Grounding an object means providing an adequate path for the flow of the electrical charge from the
object to the ground. An adequate path is one that permits charge to flow from the object fast enough
that it will not accumulate to the extent that a spark can be formed. It is not possible to define exactly
what will be an adequate path under all conditions since it depends on many variables. In any event,
the grounding means should have the lowest possible electrical resistance.

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Grounding straps should be installed on all loose conductive objects in the spraying area. This
includes material containers and equipment. Magnum Venus Products recommends grounding straps
be made of AWG No.18 stranded wire as a minimum and the larger wire be used where possible.
NFPA Bulletin No77 states that the electrical resistance of such a leakage path may be as low as 1
meg ohm (10 ohms) but that resistance as high as 10,000 meg ohms will produce an adequate leakage
path in some cases.
CAUTION
Whenever flammable or combustible liquids are transferred from one container to
another, or from one container to the equipment, both containers or container and
equipment shall be effectively bonded and grounded to dissipate static electricity.
For further information, see National Fire Protection Association (NFPA) 77, titled
“Recommended Practice on Static Electrical”. Refer especially to section 7-7
titled “Spray Application of Flammable and Combustible Materials”.
Introduction
This manual provides information for the operation, maintenance, and simple repair of the MVP
High Volume 1:1 Pro Gun. The following procedures are included:
 Step-by-step assembly and disassembly
 Troubleshooting information
The gun will not need to be completely disassemble for daily cleaning, however the entire gun
should be disassembled and the O-rings replaced every six months (depending on use).
The gun breaks down into two separate modules which can be disassembled further into their
individual parts.
Please read this manual carefully and retain for future reference. Follow the steps
in the order given, otherwise you may damage the equipment or injure yourself.
During Disassembly
A special tool kit (HVPG-TOOLS), which includes a specially designed Pro Gun tool and a
packing assembly tool, is available to aid in maintenance and repair.
As you disassemble the equipment, lay out the components on a clean surface in the correct order
and direction to aid in reassembly.
Requirements
You will need the following tools:
 Rubber mallet
 Thread sealant

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 Adjustable wrench
 Needle-nose pliers
 Flathead screwdriver
 Lubriplate™ lubricant
 Scribe set
 Pro Gun oil
 Seal installation tool
 HV Pro Gun packing bit
You need appropriate cleaning materials such as solvent, clean shop towels or rags, a small
brush, and empty containers into which you may flush the gun. You will also need new O-rings
and seals to replace the current ones. Refer to the parts drawing for your model to ensure you
obtain correct part numbers for the O-rings and seals needed.
Note If you are using O-ring part number O-K-008 in the flush assembly, you do not
need to replace the O-ring unless it is showing obvious signs of wear. This O-
ring is specially designed to handle most solvents.
Disassembling Gun
Release Pressure
WARNING
To prevent accidental injection injury disconnect all air and electrical power
to the unit before beginning repair or maintenance of this equipment.
1. Turn off air supply to pump and set regulator to zero (“0”).
2. Hold the gun over an appropriate container and activate the gun to release fluid pressure
from the lines.
3. If your system has a recirculation assembly, release the pressure from those lines as well.
4. Flush the gun into an appropriate container.
5. Turn OFF the main air supply to the unit.
6. Turn OFF air supply to the solvent tank.
7. Release any pressure in the flush tank by gently pulling upward on the ring attached to the
pressure relief valve.
Remove Hoses
CAUTION
If you followed previous steps you should have removed all pressure
from the lines, however there may still be trapped fluids in the lines.

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CAUTION
Wear appropriate eye protection. Pressurized fluids can cause eye
injuries.
8. Fit a wrench to the resin fitting and wrap them both in a large rag or towel.
9. Slowly loosen the fitting, allowing any trapped fluids to escape into the cloth, until you can
remove the resin hose.
10. Use the same technique to remove the solvent hose and
the catalyst hose.
Disassemble into Modules
11. Remove the four screws that secure the gun block to the
actuator and set the gun block aside.
You now have two major components.
Disassembling Gun Block
1. Unscrew the actuating stem from the valve rod.
2. Tightly clamp the actuating stem into a soft-jawed vise
and rotate the whole gun block to remove the stem.
Disassemble Flush Valve
3. Unscrew the flush valve body from either side of the gun
block.
4. Remove the split seal from the flush valve body.
5. Remove the flush valve body from the flush valve neck.
6. Remove the flush valve seal from the flush valve body.
FLUSH BODY
PUSH STEM
O-RING
BACK-UP RING
GRIP RING
SPRING
FLUSH VALVE BODY
HOSE CLAMP
BARBED FITTING
SEAL

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7. If your system does not have auto/manual flush, skip to step 11.
8. Unscrew the auto/manual flush body assembly from the flush valve body.
9. Remove the grip ring from the push stem of the auto/manual flush body assembly.
Note Be careful not to lose the spring in the flush body.
10. Remove the O-ring from the push stem.
11. Unscrew the flush seal body from the flush valve button.
12. Remove the spring.
13. Use a scribe to remove the O-ring from the flush valve button.
14. Remove the O-ring from the flush seal body.
15. Discard and replace the flush valve’s O-rings and seals.
Note The O-E-008 flush button O-ring can be replaced by O-K-008, designed for
use with all solvents.
Remove Gun Head/Mix Chamber
There are four gun heads/mix chambers available for the HV Duo gun:
FLUSH VALVE BODY -
AUTO/MANUAL
SPRING
SEAL
O-RING
O-RING
FLUSH SEAL BODY
FLUSH VALVE NECK
FLUSH VALVE BUTTON
SPLIT SEAL
FLUSH VALVE BODY

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HVDG-2202 Static Mixer
Gun Head
Use with ¾” static mixer
HVDG-2204 Ratio Gun
Head
Used for checking
material ratios and
recirculation guns
HVDG-2212 Disposable
Mixer Gun Head
Use with ¾” disposable
mixer
HVDG-2214 High Volume
Gun Head
Use for spray or all
application of the
standard HV Pro Gun
16. Remove any items connected to the front of the gun head (nozzle, mixer, etc.).
17. Remove the two front plugs and seals, being careful not to lose the spring and ball.
18. Remove the spring and ball from the gun head, if applicable.
19. Remove the side plugs and seals from the gun head.
20. Unscrew the four screws holding the gun head to the gun block and remove the gun head,
using caution not to drop the locator pin.
21. Remove the two check face seals from the gun block.
22. Inspect and clean the gun head and components with solvent.

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23. Remove and clean the fitting and O-rings on the rear of the gun block.
Remove Valve Rod
24. Remove the two set screws and seals from the top of the gun block assembly.
25. Use the packing bit to unscrew the packing nuts from both the catalyst and resin sides.
Note Use caution not to damage the packing bit. If you are unable to remove the
packing nut, soak in a solvent or apply heat to the packing nuts.
26. Place the small end of the seal
installation tool onto one end of the
valve rod.
27. Use a rubber mallet to gently tap the
valve rod out of the gun block.
28. Inspect the valve rod for damage and
clean with solvent.
29. Use needle-nose pliers to remove the center
spacer.
Remove Seals
30. Insert the seal installation tool into one of the
side ports and gently tap it completely through the gun block with a rubber mallet.
As the tool is tapped through the interior of the gun block it will remove the seal sets for both
the resin and hardener sides.
31. Remove the hardener and resin seals (relief spacer and secondary seal) from the seal
installation tool and clean with solvent.