dymax 826 User manual

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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
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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

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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
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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
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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-