Henkel LOCTITE EQ VA20 User manual

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EQ VA20 Volumetric Valve
2084141
Operating Manual

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Table of Contents
1Please Observe The Following ............................................................................................. 3
1.1Emphasized Sections ..................................................................................................... 3
1.2For Your Safety .............................................................................................................. 3 
1.3Unpacking and Inspection .............................................................................................. 4
1.4Items supplied ................................................................................................................ 4
1.5Features ......................................................................................................................... 4
1.6Usage ............................................................................................................................. 4
2Description ............................................................................................................................ 5
3Specifications ........................................................................................................................ 5
4Installation ............................................................................................................................. 6
5Operation .............................................................................................................................. 7
6Application Hints ................................................................................................................... 7
7Troubleshooting .................................................................................................................... 8
8Care and Maintenance .......................................................................................................... 9
9Accessories and Spare Parts .............................................................................................. 11
10Diagrams ............................................................................................................................. 12
11Warranty .............................................................................................................................. 1 5 

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1 Please Observe The Following
1.1 Emphasized Sections
Warning!
Refers to safety regulations and requires safety measures that protect the operator or
other persons from injury or danger to life.
Caution!
Emphasizes what must be done or avoided so that the unit or other property is not
damaged.
Notice:
A notice gives recommendations for better handling of the unit during operation or
adjustment as well as for service activities.
1.2 For Your Safety
For safe and successful operation of the unit, read these instructions completely. If
the instructions are not observed, the manufacturer can assume no responsibility.
Do not expose the connecting plastic lines to heat, oil, or sharp edges.
Make sure the Unit stands stable and secure.
Use only original equipment replacement parts.
Always disconnect the power supply before servicing the unit.
Always disconnect the pneumatic supply before servicing the unit.
Observe general safety regulations for the handling of chemicals such as Loctite®
adhesives and sealants. Observe the manufacturer’s instructions as stated in the Safety
Data Sheet.
While under warranty, the unit may be repaired only by an authorized Loctite
service representative.

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1.3 Unpacking and Inspection
Carefully unpack the Loctite® EQ VA20 Volumetric Valve and examine the items
contained in the carton. Inspect the unit for any damage that might have occurred in
transit. If such damage has occurred, notify the carrier immediately. Claims for damage
must be made by the consignee to the carrier and should be reported to the
manufacturer.
1.4 Items supplied
Loctite EQ VA20 Volumetric Valve 2084141
Equipment Manual
PTFE lined tubing, 6.4mm OD, 2 meters long
Air Line 4mm OD, blue, 2 meters
Air Line 4mm OD, yellow, 2 meters
Needle Sample Kit
1.5 Features
Volumetric displacement
Dosing range, 1.5 – 12 microliters
Cycle rate, 180/minute
Patent Pending priming system
Innovative Rod and Seal design
Slim design
Fluid inlet fitting – barbed stainless steel
Field Repairable
1.6 Usage
The Loctite EQ VA20 Volumetric Valve is a positive displacement metering valve
which dispenses a precise drop of adhesive with each cycle. Positive
displacement is not influenced by variations in pressure, time, temperature or
adhesive viscosity therefore making it a better choice for drop applications. The
Loctite EQ VA20 Volumetric Valve is specifically design to dispense low to
medium viscosity Loctite Light Cure Adhesives.

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2 Description
The Loctite® EQ VA20 Volumetric Valve is a positive displacement metering valve which
dispenses a precise volumetric drop of adhesive with each cycle. The EQ VA20 is
designed with a flooded chamber and a single check valve that allows for quick priming
and minimizes the need for re-priming. The priming system utilizes a patent pending
check valve design which improves the speed and reliability of priming. The innovative
displacement rod and seal of the VA20 design provide long dispensing life before rebuild
is needed. The Loctite® EQ VA20 is specifically design to dispense drops of Loctite
Light Cure Adhesives with precise dosing in the range of 1.5 to 12 microliters.
The Loctite® EQ VA20 Volumetric Valve has a diameter of 19mm [0.748”] and an overall
length of 15.3 cm [6.0”]. This compact dispense valve is stackable at 19mm centers.
The fluid body is made of 316 stainless steel and the actuator is anodized aluminum.
The actuator is a double acting cylinder with a hardened rod and a Delrin® piston for
long life. The Loctite® EQ VA20 Volumetric Valve is capable of dispense rates up to 3
cycles a second.
3 Specifications
Dimensions (L x OD) 15.3 cm [6.0”] long X 19 mm [0.748”] OD
Total weight: lbs. (Kg) 0.13Kg
Viscosity Range: 1 to 10000cP
Operating Air Pressure: 4 to 7 bar [60 -100 Psi]
Operating Product Pressure: 2 to 5 bar [30 to 70 Psi]
Wetted Components: 316 Stainless Steel, TiN
Fluid Inlet Thread #10-32
Threaded Hole-Mounting M4 x 0.7mm

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4 Installation
The Loctite® EQ VA20 Volumetric Valve requires a four way pneumatic solenoid valve
to actuate the cylinder section. The pneumatic valve must be operated with clean dry air
at 4 to 7 bars of pressure. The 4-way pneumatic solenoid valve has a normally open port
and a normally closed port. Use the supplied 4 mm OD tubing to connect the air ports to
the EQ VA20 Volumetric Valve.
The adhesive is supplied from a pressure reservoir to the barbed fitting located on the
fluid body of the Loctite® EQ VA20 Volumetric Valve. Use the supplied 6.4 mm OD
tubing, insert the tube over the barbed fitting, than insert the flange locking sleeve over
the tube. Secure the tubing to the reservoir with a compression fitting which allows the
tubing to pass through the fitting into the adhesive container.
Supply clean, dry, regulated air to the reservoir and set the pressure at 2 bar [30 psi].
The reservoir pressure setting is to insure adhesive product will flow into the Loctite EQ
VA20 Volumetric Valve at a rate which allow the EQ VA20 to operate at 180 cycle per
minute.
Loctite EQ VA20 Volumetric Valve – Annotated Drawing

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5 Operation
The Loctite EQ VA20 Volumetric Valve Air is ready to dispense - control lines are
installed, pressure reservoir is loaded with adhesive and a feed line is attached to the
fluid body. The pneumatic pressure to the controller is set at 4 bars and the reservoir
pressure is set at 2 bars. The system is now ready to set- up for drop dispensing:
1. A dispense tip is inserted onto the Luer Check Valve and secured with the Tip Retainer
Nut.
2. The drop size is determined by the length of the stroke which the displacement rod
travels into the displacement chamber. The drop decreases as the stroke is shorten.
The stroke is set by loosening the clamping screws and rotating the stroke adjuster
clockwise to decrease the stroke. The maximum stroke is approximately 9.5 mm [0.374
inch] and the minimum stroke is approximately 1 mm [0.039 inch].
3. To prime the Loctite EQ VA20 Volumetric Valve rotate the Luer Check Valve
counterclockwise 2 1/4 rotations. When a steady flow of adhesive is observed rotate the
Luer Check Valve clockwise and tighten.
4. The Loctite EQ VA20 Volumetric Valve is ready to dispense. Set actuation rate at greater
than or equal to 0.166 seconds.
5. Cycle the Loctite EQ VA20 Volumetric Valve 5 -10 times than measure drop size. Adjust
stroke to suit.
6 Application Hints
The Loctite® EQ VA20 is specifically design to dispense drops of Loctite Light Cure
Adhesive. This adhesive cures in the presents of light. Caution should be used to protect
the dispense tip from ambient light.

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7 Troubleshooting
Problem Possible Cause Correction
No liquid flow If pneumatic valve operating
pressure is to low, the valve
will not shift.
The reservoir pressure may
not be high enough
Displacement rod may be in
forward position
The dispense tip may be
clogged.
Increase air pressure to 60
psi (4 bars) minimum
Increase pressure
Insure that the normally open
airport is energized
Replace tip
Fluid drools after
the volumetric
valve is cycled,
eventually
stopping.
This is caused by air coming
from the reservoir into the
fluid body and pumped out
into the lure check valve.
The air will expand after the
check valve closes, causing
product to extrude out the
dispense tip until the air
reaches atmospheric
pressure.
Prime the Loctite EQ VA20
Volumetric Valve by rotating
the Luer Check Valve
counterclockwise 2 1/4
rotations. When a steady flow
of adhesive is observed rotate
the Luer Check Valve
clockwise and tighten.
Liquid drips at a
steady rate after
the valve closes.
A steady drip can be caused
by excessive reservoir
pressure.
The Luer Check Valve is not
closing fully due to particle
build up on the ball and seat.
Check reservoir pressure to
ensure it is not above 70 psi
(4.8 bar)
Remove the luer check valve
body, inspect sealing surfaces
and ball surface. Clean or
replace ball if contaminated
with particulate.
Liquid flows out of
the drain hole
Fluid leaking out of the drain
hole indicates a seal failure.
Replace seal in accordance
with maintenance instructions

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8 Care and Maintenance
The Loctite EQ VA20 Volumetric Valve is designed to provide continuous dispensing
service without any special maintenance. The Loctite EQ VA20 Volumetric Valve is a
robust design that will delivery over a million cycles with minimal maintenance. Adhesives
and/or small particles may build up on the sealing surfaces within the Luer Check Valve.
Luer Check Valve Disassembly and Surface Cleaning
1. Vent air pressure from product reservoir.
2. Use Equipment Flushing Solvent (item #12121) or Isopropyl Alcohol (IPA) to clean
parts.
3. Remove luer check valve and submerge parts in cleaning solvent.
4. Use a cotton tip applicator and cleaning solvent to clean the Displacement
Chamber surface.
5. Remove luer check valve body, spring and ball seat from cleaning solvent and
insure that parts are clean. Allow solvent to dry off.
6. Remove ball from solvent and inspect. Insure that the surface of the ball is clean
and free of all containments. If there are particles imbedded into the surface of the
ball, replace ball.

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7. Reassembly luer check valve
a. Insert ball seat into spring
b. Place spring and ball seat into luer check valve body.
c. Place ball into the ball seat
8. The Loctite EQ VA20 Volumetric Valve is ready to dispense.
Dispense Valves Flushing & Cleaning Procedure
If the dispensing system (reservoir, dispense valve, etc.) will not be used for one or more
weeks, it is recommended that the feed line and dispense valve be flushed clean with the proper
solvent. This procedure will describe the process.
1. Turn off the reservoir pressure and verify that pressure has been exhausted from
the reservoir.
2. Remove the reservoir lid and remove the adhesive container.
3. Replace it with a container of Equipment Flushing Solvent (item # 12121).
4. Replace the reservoir lid and tighten all wing nuts so the lid is secure.
5. Adjust the air pressure regulator to 5 psi.
6. Place a beaker or similar container under the dispense valve.
7. Rotate the Luer Check Valve counterclockwise 2 ¼ rotations and allow the
Equipment Flushing Solvent to flow into the container.
8. Note: this may take a few moments (or minutes) depending upon the viscosity of
the adhesive in the feed line.
9. While the solvent is flowing, be sure to cycle the volumetric valve in order to
simulate an “agitation” effect.
10. Continue this process of opening and closing the valve every 5 seconds for a
total of two (2) minutes or until the solvent is clear.
11. Once you are satisfied that all adhesive has been removed from the feed line and
dispense valve, shut off the air and remove the flushing solvent.
12. Re-install the reservoir lid and adjust the pressure regulator to approx. 70 % of its
maximum value.
13. Allow air to continually flow out of the dispense valve.

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14. CAUTION: the vapors from the flushing solvent will be emitted and should be
directed into a paper towel or similar cloth. If an exhaust hood or fume filtration
system is available, it should be used.
15. Continue to dispense air for approx. 1 minute or until all solvent has been
removed from the feed lines.
16. While the air is being forced thru the feed lines, lightly tap the feed line leading
from the reservoir to the dispense valve.
17. Once you are confident that all of the remaining solvent has been purged from
the feed line and valve, the process is complete.
18. Rotate the Luer Check Valve clockwise until tight.
NOTE: the operator must wear Safety glasses and proper gloves while this procedure is being
performed.
9Accessories and Spare Parts
Optional Accessories and System Components (sold separately):
Dispensing From a Reservoir
Loctite® Dual Channel Integrated Semi-Automatic Control Dispenser: PN 1390321 &
1390322
Loctite® Bond-A-Matic 3000 Reservoirs, 0 to 100 psi : PN 982723, 982724, 982727
Dispensing From a Syringe
Loctite® Precision Air Regulator: PN 98099 (IDH# 855974)
Elbow fitting, 1/8” NPT male x male luer : PN 98095 (IDH# 698608)
Stainless steel reducing adapter, 1/8” NPT female x #10-32 male: McMaster Carr
part# 2684K19 or similar

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Recommended Spare Parts / Accessories
Loctite EQ VA20 Seal Kit IDH# 2084140
Valve Mounting Bracket Kit 985281
10 Diagrams
Loctite EQ VA 20 Volumetric Valve Fluid Body Sub- Assembly

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Parts List- Loctite EQ VA 20 Volumetric Valve Fluid Body Sub- Assembly
Item Qty Description
1 1 Fluid Body
2 2 O-ring AS568A-007
3 1 O-ring AS568A-012
4 1 Actuator Pin Fluid Seal
5 0.01ml Krytox RFE
6 1 Displacement Chamber
7 1 O-ring AS568A-006 Viton EPT
8 1 Internal Retaining Ring
9 1 Ball 0.125, PTFE
10 1 Ball Seat
11 1 Luer Check Valve
12 1 Tip Retainer Nut
13 1 Compression Spring
14 1 Barbed Fitting, Mem-Co. Fitting Inc.; PN B4-0-316-Viton
15 1 Flanged Locking Sleeve, Mem-Co. Fitting Inc.; PN S-14
16 1 Coupling
17 1 Seal
18 1 Bearing
19 1 Seal Gland
20 1 Seal Gland Front
21 1 O-ring AS568A-010, Viton

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Loctite EQ VA 20 Volumetric Valve Cylinder Sub- Assembly

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Parts List- Loctite EQ VA 20 Volumetric Valve Cylinder Sub- Assembly
Item Qty Description
1 1 EQ VA 20 Volumetric Valve Cylinder Housing
2 3 O-Ring MIL-P-25732-007, Buna -N
3 1 EQ VA 20 Volumetric Valve Air Port Insert
4 2 O-Ring #2-111 Buna N
5 2 External Retaining Ring, 4 mm shaft
6 1 EQ VA 20 Volumetric Valve Cylinder Piston
7 1 Shim
8 1 EQ VA 20 Volumetric Valve Stroke Hub
9 1 Internal Retaining Ring
10 2 Male Elbow, 4mm tube X M5
11 1 EQ VA 20 Volumetric Valve Stroke Adjuster
12 1 Pin and Rod Assembly
13 2 Socket Head Screw, M3 X 0.5 X 6mm
14 1 Set Screw, M4 X 0.7 X 10mm
15 1 Standoff, Female Threaded Hex M4 X 0.7 X 19mm
11 Warranty
Henkel expressly warrants that all products referred to in this Instruction Manual for (IDH #
2084141 Loctite®EQ VA 20 Volumetric Valve) (hereafter called “Products”) shall be free from
defects in materials and workmanship. Liability for Henkel shall be limited, as its option, to
replacing those Products which are shown to be defective in either materials or workmanship or
to credit the purchaser the amount of the purchase price thereof (plus freight and insurance
charges paid therefor by the user). The purchaser’s sole and exclusive remedy for breach of
warranty shall be such replacement or credit.
A claim of defect in materials or workmanship in any Products shall be allowed only when it is
submitted in writing within one month after discovery of the defect or after the time the defect
should reasonably have been discovered and in any event, within (12) months after the delivery
of the Products to the purchaser. This warranty does not apply to perishable items.. No such
claim shall be allowed in respect of products which have been neglected or improperly stored,

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transported, handled, installed, connected, operated, used or maintained. In the event of
unauthorized modification of the Products including, where products, parts or attachments for use
in connection with the Products are available from Henkel, the use of products, parts or
attachments which are not manufactured by Henkel, no claim shall be allowed.
No Products shall be returned to Henkel for any reason without prior written approval from
Henkel. Products shall be returned freight prepaid, in accordance with instructions from Henkel.
NO WARRANTY IS EXTENDED TO ANY EQUIPMENT WHICH HAS BEEN ALTERED,
MISUSED, NEGLECTED, OR DAMAGED BY ACCIDENT.
EXCEPT FOR THE EXPRESS WARRANTY CONTAINED IN THIS SECTION, HENKEL MAKES
NO WARRANTY OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, WITH RESPECT TO
THE PRODUCTS.
ALL WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
OTHER WARRANTIES OF WHATEVER KIND (INCLUDING AGAINST PATENT OR
TRADEMARK INFRINGEMENT) ARE HEREBY DISCLAIMED BY HENKEL AND WAIVED BY
THE PURCHASER.
THIS SECTION SETS FORTH EXCLUSIVELY ALL OF LIABILITY FOR HENKEL TO THE
PURCHASER IN CONTRACT, IN TORT OR OTHERWISE IN THE EVENT OF DEFECTIVE
PRODUCTS.
WITHOUT LIMITATION OF THE FOREGOING, TO THE FULLEST EXTENT POSSIBLE UNDER
APPLICABLE LAWS, HENKEL EXPRESSLY DISCLAIMS ANY LIABILITY WHATSOEVER FOR
ANY DAMAGES INCURRED DIRECTLY OR INDIRECTLY IN CONNECTION WITH THE SALE
OR USE OF, OR OTHERWISE IN CONNECTION WITH, THE PRODUCTS, INCLUDING,
WITHOUT LIMITATION, LOSS OF PROFITS AND SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES, WHETHER CAUSED BY NEGLIGENCE FROM HENKEL OR OTHERWISE.

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Henkel Corporation
One Henkel Way
Rocky Hill, CT 06067-3910
USA
Henkel Canada Corporation
2515 Meadowpine Boulevard
Mississauga, Ontario L5N 6C3
Canada
Henkel Corporation
Automotive/ Metals H.Q.
32100 Stephenson Hwy,
Madison Heights 48071
USA
Henkel Capital, S.A. de C.V.
Calzada de la Viga s/n Fracc.
Los Laureles
Loc. Tulpetlac, C.P. 55090
Ecatepac de Morelos, MEXICO
Henkel Singapore Pte Ltd
401, Commonwealth Drive
#03-01/02 Haw Par Technocentre
SINGAPORE 149598
Henkel (China) Company Ltd.
No. 928 Zhang Heng Road,
Zhangjiang, Hi-Tech Park, Pudong,
Shanghai, China 201203
Henkel Loctite Korea
8F, Mapo Tower, 418,
Mapo-dong, Mapo-gu,
Seoul, 121-734, KOREA
Henkel Japan Ltd.
27-7 Shin Isogo-cho, Isogo-ku
Yokohama, 235-0017
JAPAN
Henkel AG & Co. KGaA
Standort München
Gutenbergstraße 3
85748 Garching b. München
Deutchland
www.equipment.loctite.com
® and ™ designate trademarks of Henkel Corporation or its affiliates. ® = registered in the U.S. and elsewhere. ©
Henkel Corporation. All rights reserved. Data in this operation manual is subject to change without notice.
Manual P/N: 8904545, Rev A, Date: 07-27-2016