dymax 828 User manual

Model 828
Disposable Fluid Path
Dispensing Valve
User Guide

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 2
About Dymax
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 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.

3 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Contents
Introduction......................................................... 4
Where to Get Help......................................................4
Safety................................................................... 5
General Safety Considerations .................................5
Specific Safety Considerations.................................5
Product Overview ............................................... 6
Description of the Model 828 Dispensing Valve.....6
Special Features and Benefits of the Model 828....7
Over-Pinch Adjustment..............................................7
Disposable Fluid Path.................................................7
Suck-Back Feature.....................................................7
Assembly and Setup ........................................... 8
Unpacking and Inspecting Your Shipment..............8
Parts Included .............................................................8
Tubing Installation.......................................................9
Mounting......................................................................10
System Interconnect ..................................................10
Valve Adjustments......................................................10
Troubleshooting.................................................. 12
Spare Parts and Accessories ............................. 13
Options/Accessories ..................................................14
Specifications...................................................... 14
Warranty .............................................................. 15

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 4
Introduction
This guide describes how to use the Dymax Model 828 dispensing valve. Sections in
this guide describe how to assemble, use, and maintain the 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 the
United States, Monday through Friday, from 8:00 a.m. to 5:30 p.m. Eastern Standard
Time. You can also email Dymax at [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

5 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
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.
General Safety Considerations
All users of Dymax fluid dispensing equipment should read and understand this 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 the fluid. Dymax includes an SDS with each adhesive sold.
SDS for Dymax products can be requested on 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 14).
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.

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 6
Product Overview
Description of the Model 828 Dispensing Valve
The Model 828 pinch valve is a normally open, disposable fluid path valve designed to
provide larger flow rates while still maintaining precise control over flow rate. This dual-
piston pinch valve works great with many low-to-medium viscosity materials and
features a suck-back control so it can handle stringy and tacky materials with no mess.
The 828 pinch valve can be controlled by a digital controller, such as the DVC-345
digital valve controller, or by a four-way solenoid valve. The Model 828 is featured in
several filling systems.
CAUTION! If there is a loss in air pressure to the valve, the Model 828
valve will no longer have the force to prevent materials from flowing.
Precautions should be taken to anticipate unwanted dispensing.
Figure 1.
Model 828 Component Diagram
Piston, Blunt
Air In (Normally Open)
Fluid Path
Piston, Pinch
Air In (Normally Open)
Suck-Back
Adjustment
Flow Adjustment
Tube
Support

7 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Special Features and Benefits of the Model 828
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
The fluid and valve's inner components never come in contact,
reducing valve maintenance and extending valve life
Adjustable
Suck Back
Allows a clean shutoff of thick, tacky, and/or stringy materials
Minimizes skinning over of the dispense tip
Over-Pinch Adjustment
Dymax’s disposable fluid path valves all contain a unique over-pinch adjustment. This
feature prevents damage to the fluid path, extending the life of the tubing and reducing
the amount it needs to be replaced.
Disposable Fluid Path
The Model 828 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 valves inner parts. This reduces wear to the valve’s inner
parts, reducing valve maintenance and extending the valve’s life. It also insures that
fluids remain contaminate free throughout the dispensing process.
The Model 828 is compatible with a variety of different tubing sizes and materials to
ensure complete compatibility with the fluid being dispensed. The disposable fluid path
is easy to replace and change out, allowing for easy material changeover with little or
no clean-up.
Suck-Back Feature
The suck-back feature on the 828 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

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 8
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 828 dispensing valve arrives, inspect the boxes for damage and
notify the shipper of box 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.
Figure 2.
Model 828 Pinch Valve
Parts Included
•Model 828 pinch valve
•Model 828 user guide

9 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Tubing Installation
Figure 3.
Tubing Installation Procedure
Note: The Model 828 is not supplied with tubing. Various tubing sizes and materials
(including polyethylene, polyurethane, PVC, and silicone) are available for order
through Dymax. This valve is compatible with a maximum tubing size of 0.375" [9.53
mm] OD.
1. Separate the Tube Support (Figure 3 , A) from the Valve Body (Figure 3, B) by
removing the four Socket Head Cap Screws (Figure 3 , D).
2. Place the Tubing (Figure 3, C) in the slot (Figure 3, E) on the Tube Support.
3. Reconnect the Tube Support to the Valve Body by reinstalling the four Socket
Head Cap Screws.
D - Socket Head Cap
Screws
B - Tube
Support
A - Valve Body
C - Tubing
E - Slot

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 10
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 is a 0.25" [0.64 cm] mounting hole through the side of the dispense valve for
mounting purposes (see Figure 8).
System Interconnect
Air
Once the dispense valve is secured to its mounting surface, connect the air lines to the
ports provided on the valve (Figure 4). Connect the air supply (75-100 psi [5.1- 6.9 bar])
to the valve controller or 4-way solenoid valve.
Figure 4.
Air-In Port
Valve Adjustments
Adjusting Material Flow
To adjust the flow of the Model 828 valve, turn the Pinch-Piston Flow Adjustment Screw
(Figure 5, A) clockwise to decrease material flow or counterclockwise to increase
material flow.
Air-In Port (Normally Open)
Air-In Port (Normally Open)

11 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Adjusting Suck Back
To adjust the suck back of the Model 828 valve, turn the Suck-Back Adjustment Screw
(Figure 5, B) clockwise to decrease suck back or counterclockwise to increase suck
back.
Figure 5.
Adjustment Controls
Figure 6. Piston Stop Screw
A –Pinch-Piston Flow
Adjustment Screw
B –Suck-Back
Adjustment Screw
Suck-Back Piston Stop-
Screw: Preset to Close
Tube 50%
Pinch-Piston Stop-Screw:
to Stop Flow; Do Not Over
Pinch

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 12
Troubleshooting
Table 1.
Troubleshooting Chart for Model 828 Dispensing Valve2
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 valve 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 pinch stop screw is not
properly adjusted
Adjust the pinch stop screw
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

13 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Spare Parts and Accessories
Figure 7.
Model 828 Replacement Parts
Item
Part
Number
Description
Quantity
1
T15239
Model Tube Support, 0.375 OD
1
2
T14178
Socket Head Cap Screw, 8-32 x 0.75
4
3
T12522
Split Lock Washer, 8, SS
4
4
T15236
Model Valve Body
1
5*
T15235
Model 828 Gasket
1
6
T15241
Model Endcap
1
7*
T10423
Model 828 Pinch Piston
1
8*
T10424
Model 828 Blunt Piston
1
9*
T15145
U-Cup, BUNA, 0.125 CS X 1.0 ID X 1.25 OD
2
10
T12447
Pin, Roll, 0.125 OD/0.75, SS
1
11
T12310
Helicoil, Free, 8-32, 0.246
4
12
T14865
Screw, SHSS, 10-32, 1.25, SS
2
13
T12209
Nut, 10-32, Lock, Self Seal
2
14
T12341
Screw, SHSS, 8-32, 0.75, SS, Lock
2
15*
T14214
Socket Head Cap Screw, 8-32, 0.875
4
16*
T11676
Fitting, Straight, 10-32, 0.156od
2
17*
T15977
Spring, .7O" X .036" X 1.0" (D X CS X L)
1
18*
T16661
Model 828 Wrench Set
1
*Items included in valve rebuild kit T16662

U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E 14
Options/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 & Fittings
Tube Support, Entire Assembly with Luer-Lock Fitting,
0.375" [0.95 cm] OD
T15225
Female Luer-Lock Fitting, Push In
T11978
Misc.
Model 828 Wrench Set
T16661
Rebuild Kits
Valve Rebuild Kit
T16662
Specifications
Figure 8.
Model 828 Dimensional Drawing

15 U S E R G U I D E |M O D E L 8 2 8 D I S P E N S I N G V A L V E
Property
Specification
Part Numbers
T17057
Valve Type
Pinch with disposable fluid path
Construction Material
Anodized Aluminum
Operating Air Pressure
75-100 psi [5.1- 6.9 bar]
Air Inlet
Accepts 0.156" [0.40 cm] OD, others available
Maximum Inlet Fluid
Pressure
Tubing dependent; 100 psi [6.9 bar] typical
Maximum Operating
Temperature
150°F [65°C]
Activation
Valve controller or 4-way solenoid valve
Dimensions
(W x H x D)
2.98" x 2.91" x 1.50"
[7.57 cm x 7.39 cm x 3.81 cm] (See Figure 8)
Weight
0.5 lb [0.23 kg]
Unit Warranty
1 year from purchase date
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.

www.dymax.com
Americas
USA |+1.860.482.1010 |in[email protected]om
Europe
Germany |+49 611.962.7900 |[e-mail]
Ireland |+353 21.237.3016 |[e-mail]
Asia
Singapore |+65.67522887 |[e-mail]
Shanghai |+86.21.37285759 |[e-mail]
Shenzhen |+86.755.83485759 |[e-mail]
Hong Kong |+852.2460.7038 |[e-mail]
Korea |+82.31.608.3434 |[e-mail]
© 2013-2021 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.
Please note that most dispensing 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 Dymax standard Conditions of Sale published on our website. 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. T17344 MAN034DA 7/9/2019