dymax 826 User manual

2
Model 826 Dispensing Valve User Guide
About Dymax
UV/Visible light-curable adhesives. Systems for light curing, fluid dispensing, and fluid packaging.
Dymax manufactures industrial adhesives, light-curable adhesives, epoxy resins, cyanoacrylates, and activator-cured
adhesives. We also manufacture a complete line of manual fluid dispensing systems, automatic fluid dispensing systems,
and light-curing systems. Light-curing systems include LED light sources, spot, flood, and conveyor systems designed for
compatibility and high performance with Dymax adhesives.
Dymax adhesives and light-curing systems optimize the speed of automated assembly, allow for 100% in-line inspection,
and increase throughput. System designs enable stand-alone configuration or integration into your existing assembly line.
Please note that most dispensing and curing system applications are unique. Dymax does not warrant the fitness of the
product for the intended application. Any warranty applicable to the product, its application and use is strictly limited to
that contained in the Dymax standard Conditions of Sale. Dymax recommends that any intended application be evaluated
and tested by the user to ensure that desired performance criteria are satisfied. Dymax is willing to assist users in their
performance testing and evaluation. Data sheets are available for valve controllers or pressure pots upon request.

Model 826 Dispensing Valve User Guide
3
Contents
Contents................................................................................................................................ 3
Introduction .......................................................................................................................... 4
Introduction to the User Guide .......................................................................................... 4
Where to Get Help ............................................................................................................. 4
Safety.................................................................................................................................... 4
General Safety Considerations........................................................................................... 5
Specific Safety Considerations ........................................................................................... 5
Product Overview.................................................................................................................. 5
Description of the Model 826 Dispensing Valve ................................................................ 5
Special Features and Benefits of the Model 826................................................................ 6
Disposable Fluid Path ......................................................................................................... 7
Over-Pinch Adjustment...................................................................................................... 7
Suck-Back Feature.............................................................................................................. 7
Assembly and Setup .............................................................................................................. 7
Unpacking and Inspecting Your Shipment ......................................................................... 7
Parts Included in the Model 826 Dispensing Valve ............................................................ 8
Tubing Installation.............................................................................................................. 8
Mounting ........................................................................................................................... 9
System Interconnect .......................................................................................................... 9
Material Flow & Suck-Back Adjustment........................................................................... 10
Operating the Dispensing Valve........................................................................................... 12
Start Up ............................................................................................................................ 12
Dispense........................................................................................................................... 12
Shut Off ............................................................................................................................ 13
Troubleshooting .................................................................................................................. 14
Spare Parts and Accessories ................................................................................................ 15
Specifications ...................................................................................................................... 17
Warranty............................................................................................................................. 19
Index................................................................................................................................... 19

4
Model 826 Dispensing Valve User Guide
Introduction
Introduction to the User Guide
This guide describes how to assemble, use, and maintain the Dymax Model 826 dispensing
valve safely and efficiently.
Intended Audience
Dymax prepared this user guide for experienced process engineers, maintenance technicians,
and manufacturing personnel. If you are new to pneumatically operated fluid dispensing
equipment and do not understand the instructions, contact Dymax Application Engineering to
answer your questions before using the equipment.
Where to Get Help
Dymax Customer Support and Application Engineering teams are available in Germany,
Monday through Friday, from 8:00 a.m. to 5:30 p.m. Central European Time. You can also email
Dymax at Europe GmbH at i[email protected]. Contact information for additional Dymax
locations can be found on the back cover of this user guide.
Additional resources are available to ensure a trouble-free experience with our products:
Detailed product information on www.dymax.com
Dymax adhesive Product Data Sheets (PDS) on our website
Safety Data Sheets (SDS) provided with shipments of Dymax adhesives
Safety
WARNING! If you use this fluid dispensing equipment without first reading and
understanding the information in this guide, personal injury can result from the
uncontrolled release of high-pressure gas, injection injury, or exposure to
chemicals. To reduce the risk of injury, read and understand this guide before
assembling and using Dymax fluid dispensing equipment.

Model 826 Dispensing Valve User Guide
5
General Safety Considerations
All users of Dymax fluid dispensing equipment should read and understand the user guide
before assembling and using the equipment.
To learn about the safe handling and use of dispensing fluids, obtain and read the SDS for each
fluid before using it. Dymax includes an SDS with each adhesive sold. SDS for Dymax products
can be requested through the Dymax website.
Specific Safety Considerations
Using Safe Operating Pressures
Pressurizing the components in the dispensing system beyond the maximum recommended
pressure can result in the rupturing of components and serious personal injury. To minimize
the risk of rupturing components and injury, do not exceed the maximum operating pressure
of the components in your fluid dispensing system (see system specifications on page 15).
Preventing Injection Injury
Discharging fluids or compressed air with a dispensing tip against your skin can cause very
serious injection injury. To minimize the risk of injection injury, do not place the dispensing tip
in contact with your skin.
Product Overview
Description of the Model 826 Dispensing Valve
The Model 826 is a dual-piston, normally closed pinch valve. This pneumatically operated valve
dispenses a wide variety of materials but is specifically designed to easily dispense thicker,
stringy materials. The 826 dispensing valve is highly precise, obtaining its precision from
lockable controls that facilitate the adjustment of three critical parameters: the flow rate
through the valve, the amount of tube closure, and suck-back.

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Model 826 Dispensing Valve User Guide
Figure 1. Model 826 Internal Component Diagram
Special Features and Benefits of the Model 826
Feature
Benefit
Over-Pinch
Adjustment
Prevents tubing damage, allowing users to secure millions of cycles from
tubing before replacement is required
Disposable fluid path
Eliminates material contamination during dispense
Prevent air entrapment during dispensing process
Allows for easy product changeover with minimal cleanup
Fluid and valve's inner components never come in contact, reducing valve
maintenance and extending valve life
Adjustable Suck-back
Clean shutoff of thick, tacky, and/or stringy materials
Minimizes skinning over of dispense tip

Model 826 Dispensing Valve User Guide
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Disposable Fluid Path
The Model 826 valve features a disposable fluid path constructed out of tubing. Fluids are
carried from the material reservoir to the dispense tip in a completely sealed path, ensuring no
contact with the valve's inner parts. This reduces wear to the valve’s inner parts, which reduces
valve maintenance and extends the valve’s life. It also insures that fluids remain contaminate
free throughout the dispensing process.
The Model 826 is compatible with a variety of different tubing sizes and materials ensuring
complete compatibility with the fluids being dispensed. The disposable fluid path is easy to
replace and change out, allowing for easy material changeover with little or no clean-up.
Over-Pinch Adjustment
All Dymax disposable fluid path valves contain a unique over-pinch adjustment feature. This
adjustment can prevent damage to the fluid path, thereby extending the life of the tubing and
reducing the amount it needs to be replaced.
Suck-Back Feature
The suck-back feature on the 826 valve allows for the clean shutoff of stringy and tacky
materials and prevents the formation of a droplet at the end of the dispense nozzle. The suck-
back feature also minimizes the "skinning" over of materials that tend to dry out at the end of
the nozzle.
Assembly and Setup
Unpacking and Inspecting Your Shipment
When your Model 826 dispensing valve arrives, inspect the boxes and notify the shipper of any
damage immediately.
Open each box and check for equipment damage. If parts are damaged, notify the shipper and
submit a claim for the damaged parts. Contact Dymax so that new parts can be shipped to you
immediately.
Check that the parts included in your order match those listed below. If parts are missing,
contact your local Dymax representative or Dymax Customer Support to resolve the problem.

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Model 826 Dispensing Valve User Guide
Figure 2. Model 826 Pinch Valve
Parts Included in the Model 826 Dispensing Valve
■Model 826 pinch valve
■0.25" [0.63 cm] OD black, polyethylene tubing
Note: Teflon®, silicone, and other tubing materials, along with a variety of fittings, are also
available from Dymax.
■Assorted dispense tip kit
■Model 826 user guide
Tubing Installation
Figure 3. Tubing Installation Procedure
A
C
B
SOCKET HEAD
CAP SCREWS
TUBE SUPPORT
ASSEMBLY
VALVE BODY
BARB
FITTING
NOZZLE
PLATE

Model 826 Dispensing Valve User Guide
9
NOTE: The Model 826 is supplied with 0.25" (0.63 mm) O.D. polyethylene tubing. Other
tubing sizes and materials (including polyurethane, PVC, and silicone) are available for order
through Dymax. This valve is compatible with a maximum tubing size of 0.25" (0.63 cm) OD.
1. Remove the Tube Support Assembly by loosening the three 8-32 x 3/8" Socket Head Cap
Screws (Figure 3, A).
2. Install the Tubing over the Barb Fitting on the Nozzle Plate or insert the Tubing through
the hole provided (Figure 3, B).
3. Reinstall the Tubing Support Assembly to the Valve Body (Figure 3, C).
Mounting
NOTE: If the dispense valve is to be mounted in an area that limits access to the valve, it is
recommended that the set-up operation be done prior to mounting. Access to various surfaces
of the valve is necessary for periodic adjustment (see Specifications).
There are two 6-32 x .25 DP tapped holes on both sides of the dispense valve for mounting
purposes (see Figure 9).
System Interconnect
Once the dispense valve is secured to its mounting surface, connect the air line to the port
provided on the valve (Figure 4). Connect your air supply (60-90 psi [4.1- 6.3 bar]) to your valve
controller or 3-way solenoid valve (a valve controller or a 3-way solenoid valve must be used to
operate the Model 826 valve (CV of 0.01 or greater)).
Figure 4. Air-In Port
Air-In Port

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Model 826 Dispensing Valve User Guide
Material Flow & Suck-Back Adjustment
Adjusting Material Flow
Figure 5. Model 826 Flow Adjustment Procedure Components
It is very important that the Tube Support (Figure 5, M) be firmly in place for the valve to
function properly. Check to be sure that the Tube Support is flush against the Valve Body
(Figure 5, F).
To set the Piston (Figure 5, A) for the proper pinch of the fluid path (amount of closing and
opening) with the Tube connected to the Material Reservoir, gradually pressurize the Reservoir
and adjust the valve-piston pinch using the following steps:
1. Set the Reservoir's pressure to 5 psi [0.3 bar].
Note: If the Pinch Stop Screw (Figure 5, K)prevents the Piston (Figure 5, A)from closing the
Tubing, flow will begin as soon as the Reservoir is pressurized.
2. With the hex wrench provided, turn the Pinch Stop Screw (Figure 5, K) counter-clockwise
until the Tube is sufficiently closed to stop the flow of material.
3. After the Tube is sufficiently closed, slowly turn the Pinch Stop Screw (Figure 5, K)
clockwise until drops of liquid form at the Nozzle Tip (Figure 5, G).
4. Turn the Pinch Stop Screw (Figure 5, K) counter-clockwise just enough to close the Tube
and stop the flow, but not to over-pinch it. Turning the screw 15 degrees more than zero-

Model 826 Dispensing Valve User Guide
11
flow will usually provide a correct setting. The Pinch Stop Screw is now correctly set up to
provide the minimal wear and tear on the Tube.
5. After adjusting the Pinch Stop Screw (Figure 5, K), loosen the Locking Nut (Figure 5, B) and
turn the Piston Stop Screw (Figure 5, C) clockwise until you feel resistance. The resistance
you feel is the Piston Adjustment Screw pressing against the Piston (Figure 5, A). The Pinch
Stop Screw is now set to a closed position.
Note: You may cut the tubing if you tighten the Piston Adjustment Screw (I) too much.
6. To set the Piston (Figure 5, A) to the desired amount of opening, turn the Piston Stop
Screw (Figure 5, C) counter-clockwise from the closed position as described above. Once
the desired amount of opening is reached, retighten the Locking Nut (Figure 5, B).
Note: One full turn of the Piston Stop Screw (Figure 5, C) equals 0.042 inches
[0.1 cm] of travel.
Adjusting Suck-Back
Figure 6. Suck-Back Adjustment Procedure Components
Use the following steps to set the Suck-Back Piston (Figure 6, D):
1. Tighten the Suck-Back Stop Screw (Figure 6, J) clockwise until the screw is bottomed
out.
2. Turn the Suck-Back Stop Screw (Figure 6, J) approximately 1/2 a turn counter-
clockwise. Greater suck-back is achieved by turning the Suck-Back Stop Screw
counter-clockwise.

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Model 826 Dispensing Valve User Guide
Operating the Dispensing Valve
Figure 7. Stages of Valve Operation
Start Up
When the valve is off/unactuated, the pinching surface of the spring-closed Upper Piston
(Figure 7, A) prevents flow by collapsing the Tube (Figure 7, B). The Pinch Stop Adjusting Screw
(Figure 7, C) limits the amount of pinch, which limits the stress on the Tube, extends the tubing
life, and insures shot repeatability. The blunt Lower Piston (Figure 7, D) is held in its open
position by a spring. The Adjusting Screw (Figure 7, E), which determines the amount that this
piston will close the tubing when actuated, is set to a position that will allow approximately
50% tube closure.
Dispense
When the valve is on, the air moves the Upper Piston (Figure 7, A) back to the Adjustable Stop
(Figure 7, F). This stop controls the amount the tube opens, which in turn controls the rate of
flow through the tube. These actions, combined with nozzle size (if a nozzle is used), fluid
pressure, and the amount of time the 826 valve is open, governs the amount of fluid
Start Up Dispense Shut Off

Model 826 Dispensing Valve User Guide
13
dispensed. Simultaneous with the action of the Upper Piston (Figure 7, A), the blunt Lower
Piston (Figure 7, D) moves forward until it stops against the Adjusting Screw (Figure 7, E). This
causes the piston to partially occlude the Tubing (Figure 7, B).
Shut Off
When the valve is at the end of its dispense cycle, the actuating air exhausts. The upper piston
spring moves the Piston (Figure 7, A) forward where it pinches the Tubing (Figure 7, B). At
precisely the same moment, the blunt Lower Piston (Figure 7, D) is released so that its spring
can also return to its original position. The lower portion of the tube (Figure 7, B) returns to its
normal (open) shape. Suck-back is created from the change in the tubing shape. The valve is
now ready to repeat the cycle. Fine adjustments can be made to both flow rate and suck-back
to obtain the required results.

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Model 826 Dispensing Valve User Guide
Troubleshooting
Table 1. Troubleshooting Chart for Model 826 Dispensing Valve
Problem
Possible Cause
Corrective Action
The valve does
not dispense
anything
The supply air pressure is too low
Increase the supply air pressure
Material is cured in the tip
Disassemble and clean the tip
The flow adjustment is not properly
adjusted
Follow the flow adjustment
procedure
There are air
bubbles in the
fluid
The valve is not properly purged
Point the valve up and cycle it until
the air bubbles are removed
There is a problem with the
material reservoir and the fluid
delivery system
Diagnose and repair
Material leaks
from the valve tip
The flow adjustment is not properly
adjusted
Follow the flow adjustment
procedure
There is an air bubble trapped in
the fluid section of the valve or in
the dispense tip
Point the valve up and cycle it until
air bubbles are purged out
The dispense rate
is too fast
The fluid pressure is set too high
Decrease the fluid pressure
The dispense tip gauge is too large
Replace the dispense tip with a
smaller size tip
The flow adjustment is not properly
adjusted
Follow the flow adjustment
procedure
The dispense rate
is too slow
The fluid pressure is set too low
Increase the fluid pressure
The dispense tip gauge is too small
Replace the dispense tip with a larger
size tip
The flow adjustment is not properly
adjusted
Follow the flow adjustment
procedure

Model 826 Dispensing Valve User Guide
15
Spare Parts and Accessories
Item
Part Number
Air Regulators
Filter Regulator
T16307
High-Precision Regulator
T16629
Controllers
DVC-345 Digital Valve Controller
T11146
Stands
Lab Stand –24" [60.96 cm]
T15279
Lab Stand –8" [20.32 cm] with Mounting Rods
T15449
Tubing
Black Polyethylene Tubing, 0.25" [0.63 cm] OD, 0.17" [0.43 cm] ID
T15494
Male Luer Barb, Black
T15736
Rebuild Kits
Valve Rebuild Kit
T17835

Figure 8. Model 826 Replacement Parts
Item
Part
Number
Description
Qty.
1
T10938
Model 826 Valve Body
1
2*
T10236
Model 826 Gasket
1
3
T10230
Model 826 End Cap
1
4*
T10049
Pinch Piston
1
5*
T10048
Blunt Piston
1
6
T14936
Spring, 0.6 OD x 0.72 WR x 2 L
x K26
1
7
T12225
Insert, Screwlock, 8-32, 0.246
2
8
T14209
Socket Head Cap Screw, 8-32,
0.375, 18-8
3
9
T14204
Socket Head Cap Screw, 6-32,
0.75,SS
5
10
T14874
Screw/CPSS/5/16-24/1.0
1
11
T12191
Nut/5/16-24/0.1875/Hexjam
1
12
T11701
Plug,10-32, Brass, Buna
Gasket
2
13
T10235
Pin, Sealing, 455
2
14
T13542
O-Ring, Buna, 0.24 CS x 0.75
ID
2
15
T12341
Screw, SHSS, 8-32, 0.75, SS,
Lock
2
16*
T14935
Spring, 0.480 OD x 0.038 WR x
1L, K9.5
1
17
T11702
Fitting, Straight, 10-32, 0.25 OD
1
18*
T16661
Model 826 Wrench Set Kit
1
*Parts included in Model 826 Valve Rebuild Kit T17835

Model 826 Dispensing Valve User Guide
17
Specifications
Property
Specification
Part Numbers
T17586 - Model 826 valve with 0.25" [0.63 cm] OD
Polyethylene tubing
Valve Type
Pinch with disposable fluid path
Construction Material
Anodized Aluminum
Operating Air Pressure
60-90 psi [4.1-6.3 bar]
Maximum Inlet Fluid
Pressure
Tubing dependent; 100 psi [6.9 bar] maximum (typical)
Maximum Operating
Temperature
150°F [65°C]
Maximum Tubing Size
0.25" [0.63 cm] OD
Activation
Valve controller or 3-way solenoid valve
Dimensions (W x H x D)
1.13" x 2.5" x 2.66" [2.87 cm x 6.35 cm x 6.75 cm] (See )
Weight
11 oz [312 kg]
Unit Warranty
1 year from purchase date

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Model 826 Dispensing Valve User Guide
Figure 9. Model 826 Dimensional Drawing

Model 826 Dispensing Valve User Guide
19
Warranty
From date of purchase, Dymax Corporation offers a one-year warranty against defects in
material and workmanship on all system components with proof of purchase and purchase
date. Unauthorized repair, modification, or improper use of equipment may void your
warranty benefits. The use of aftermarket replacement parts not supplied or approved by
Dymax Corporation, will void any effective warranties and may result in damage to the
equipment.
IMPORTANT NOTE: DYMAX CORPORATION RESERVES THE RIGHT TO INVALIDATE ANY
WARRANTIES, EXPRESSED OR IMPLIED, DUE TO ANY REPAIRS PERFORMED OR ATTEMPTED ON
DYMAX EQUIPMENT WITHOUT WRITTEN AUTHORIZATION FROM DYMAX. THOSE CORRECTIVE
ACTIONS LISTED ABOVE ARE LIMITED TO THIS AUTHORIZATION.
Index
Adjustments, 10
Material Flow, 10
Suck-Back, 11
Assembly and Setup, 7
Contact Information, 4
Disposable Fluid Path, 7
Features and Benefits, 6
Help, 4
Mounting, 9
Operation, 12
Optional Equipment, 15
Over-Pinch Adjustment, 7
Parts Included, 8
Product Overview, 5
Safety, 4
Preventing Injection Injury, 5
Using Safe Operating Pressures, 5
Spare Parts and Accessories, 15
Specifications, 17
Suck-Back, 7, 11
System Interconnect, 9
Troubleshooting, 14
Tubing Installation, 8
Warranty, 19

© 2012-2018 Dymax Corporation. All rights reserved. All trademarks in this guide, except where noted, are the property of, or used under license by Dymax Corporation, U.S.A. Teflon® is a
registered trademark of DuPont.
The data contained in this bulletin is of a general nature and is based on laboratory test conditions. Dymax Europe GmbH does not warrant the data contained in this bulletin. Any warranty
applicable to products, its application and use is strictly limited to that contained in Dymax Europe GmbH’s General Terms and Conditions of Sale published on our homepage
http://www.dymax.com/de/pdf/dymax_europe_general_terms_and_conditions_of_sale.pdf. Dymax Europe GmbH does not assume any responsibility for test or performance results obtained
by users. It is the user’s responsibility to determine the suitability for the product application and purposes and the suitability for use in the user’s intended manufacturing apparatus and
methods. The user should adopt such precautions and use guidelines as may be reasonably advisable or necessary for the protection of property and persons. Nothing in this bulletin shall act as
a representation that the product use or application will not infringe a patent owned by someone other than Dymax Corporation or act as a grant of license under any Dymax Corporation
Patent. Dymax Europe GmbH recommends that each user adequately test its proposed use and application of the products before actual repetitive use, using the data contained in this bulletin
as a general guide. T17587 MAN033EU 10/23/2018
LitXXX XX/XX/2017
Dymax Corporation
860.482.1010
[email protected]
www.dymax.com
Dymax Europe GmbH
+49 (0) 611.962.7900
[e-mail]
www.dymax.de
Dymax Asia Pacific Pte. Ltd.
+65.6752.2887
[e-mail]
www.dymax-ap.com
Dymax Asia (H.K.) Limited
+852.2460.7038
[e-mail]
www.dymax.com.cn
Dymax Korea LLC
+82.2.784.3434
[email protected]m
www.dymax.com/kr
Dymax Oligomers & Coatings
860.626.7006
[e-mail]
www.dymax-oc.com
Dymax Engineering Adhesives
Ireland Ltd.
+353 21.237.3016
[email protected]m
www.dymax.ie
Dymax UV Adhesives &
Equipment (Shenzhen) Co Ltd
+86.755.83485759
[e-mail]
www.dymax.com.cn
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Equipment (Shanghai) Co Ltd
+86.21.37285759
[e-mail]
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