Nordson EFD 741MD-SS Series User manual

Introduction
The 741MD-SS Series is simple to use and will
operate many millions of cycles without maintenance.
The 741MD-SS is a pneumatically operated,
adjustable needle valve designed to apply precise
microdeposits of low to high viscosity fluids down
to fractions of a microliter. It is ideal for automated
assembly processes that require small dispensing
tips (from 22 to 33 gauge). The 741MD-SS provides
exceptional control and the absolute minimum dead
fluid volume.
741MD-SS Series
Dispense Valve
INSTALLATION GUIDE
Control
air hose
Dispensing tip
Inlet fitting
Barrel adapter assembly
Barrel reservoir
Stroke reference ring
Fluid body
®
A NORDSON COMPANY
Electronic pdf files of EFD®manuals are also available at
www.efd-inc.com/manuals.html.
USA: 800-556-3484 or [phone]
Europe: 0800 585733 or [phone]
Asia: [phone]
[email protected] www.efd-inc.com

20
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5
POWER
RUN
SETUP
CYCLE
Test Clear
Purge
Run
Setup Program
Fast Slow
Time Set
Steady
Fast Slow
Time Set
STOP
Pressure
Time
®
ANORDSON COMPANY
To pressurize
To exhaust
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Installation
Open the valve with an air pulse
long enough to fill the valve and
start fluid flow. Test the dispensed
amount with a nominal time setting.
11
Set desired deposit size by changing
tip size, reservoir pressure, needle
stroke and valve open time.
12
1. Mount valve with an EFD universal valve
mount (#7002VM) or other fixture.
2. Connect valve control air line to
ValveMate™controller (or other pneumatic
switch) used to control operating air to
the valve.
3. Connect the white male quick-connect
on the flexible air line to the white female
quick-connect at the air pressure regulator.
4. Install the barrel reservoir on the fluid
inlet fitting (installed for use with Ultra®
barrel reservoirs). For low viscosity fluids,
fill the reservoir after installing it on the
fluid-inlet fitting. High viscosity materials
can be loaded into the reservoir before
installing on the inlet fitting.
Note: Fill barrels no more than 2/3 full. Always
use a SmoothFlow™piston when dis-
pensing medium to high viscosity mate-
rials (see setup illustration).
5. Attach the barrel adapter head to the
barrel reservoir using air interconnect
coupler to connect the barrel adapter
assembly to the flexible air line.
6. Install appropriate size EFD SafetyLok™
dispensing tip on the tip adapter. Tighten
the tip retaining nut fully to position the
needle hub against the shoulder of the
tip adapter.
7. Refer to back page for instructions on
calibrating the needle stroke.
8. Open stroke adjustment knob to desired
position (1/2 turn open is the recom-
mended starting point).
9. Set reservoir pressure to low for thin
fluids and higher for thick fluids. Use the
in-line air shut-off valve to pressurize or
depressurize barrel reservoir.
10. Set valve control air pressure at 70
psi (4.8 bar). Refer to valve controller
operating manual.
Open Close
Air Output
ut
Exhaust
r
Prior to installing this valve, please read the
associated reservoir and valve controller
operating instructions to become familiar
with the operation of all components of the
dispensing system. 5
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Open
Close
7
8
adjustment knob
calibration knob

How the Valve Operates
ValveMate Concept
The ValveMate 7000 provides easy
adjustment of valve output for maximum
end-user convenience and efficiency.
Valve open-time is the primary control of
deposit. The 7000 puts push-button
adjustment of valve open-time where it
needs to be – at the valve.
Deposit size can be programmed by
pressing the PROGRAM button in the
SETUP mode. This affords an easy start-
ing point for selecting deposit size.
Note: The EFD Ultra TT 325 and 525
XYZ automated dispensing systems have
integrated ValveMate controllers for oper-
ating all EFD dispense valves.
POWER
RUN
SETUP
CYCLE
STOP
Test Clear
Purge
Run
Setup Program
Fast Slow
Time Set
Steady
Pressure
Time
Fast Slow
Time Set
®
A NORDSON COMPANY
VALVEMATE
7000
Function Indicators
Emergency Stop
Control Pad
set time
timer bypass
display pressure (psi, bar)
TEACH program
test cycle
purge
reset
air input
power input
(voltage selector)
air output to valve
I/O connector with alarm
output (<60 psi)
connector for
optional foot pedal
Rear Panel
Pressure/Time Toggle
open closed
➃➃
➂➂
➁➁
➀➀
Input air pressure at 70 psi (4.8 bar) retracts
the piston and needle from the needle seat
in the dispensing tip
➀➀
, permitting fluid flow
through the dispensing tip
➁➁
. Once the
cycle is complete, air pressure is exhausted,
causing the piston spring
➂➂
to return the
needle back to its position in the dispensing
tip, stopping fluid flow. When the dispensing
tip is removed, the needle seats into a sec-
ondary Teflon®seat
➃➃
, stopping fluid flow
during tip replacement.
The amount of fluid dispensed
will depend on the time the valve
is open, fluid reservoir pressure,
dispensing tip size, needle stroke
and fluid viscosity.
www.efd-inc.com [e-mail] USA 800-556-3484 Europe [phone] Asia [phone]

Specifications
General
Size: 127.5 mm length x 26.9 mm diameter
(5.02" x 1.06")
Weight: 255 grams (9.0 oz)
Fluid body: Type 303 stainless steel
Air cylinder body: Hard-coated aluminum
Piston: Type 303 stainless steel
Needle: Type 303 stainless steel
Fluid inlet thread: 1/8 NPT female
Fluid outlet: Luer taper with retaining nut
Air pressure required: 70 psi (4.8 bar)
Maximum fluid pressure: 100 psi (6.9 bar)
Maximum operating temperature: 43ºC (110ºF)
Mounting: 1/4-28 UNF tapped hole
Tip adapter/needle seat: Type 303 stainless steel
Calibration Feature
The stroke control reference ring of each 741MD-SS valve is
factory calibrated to the zero position. Slight internal variations in
dispensing tips may require the stroke control to be recalibrated
when tips are changed. To do so:
1. Make a note of the current stroke setting number.
2. Turn the calibration knob (inner) counterclockwise one
full turn.
3. Install the new dispensing tip and ensure that the
retaining nut is tightened fully.
4. Turn the stroke adjustment knob (outer) clockwise until it
stops at the zero position.
5. Turn the calibration knob clockwise until it stops.
The stroke adjustment is now calibrated to zero.
6. Reset stroke to the required position noted in step 1.
In the event that the stroke reference ring must be repositioned
or reset to the zero mark, use the following procedure:
A. Remove the dispensing tip, if installed.
B. Turn the small knob counterclockwise one full turn.
C. Turn the large knob clockwise until it stops.
If the zero on the reference ring does not line up with the index
mark, continue with the following steps:
D. Loosen the small set-screw located on the reference ring.
E. Rotate reference ring until it aligns with the reference line
on the air cylinder body.
F. Tighten the small set-screw to lock the reference ring into
position.
G. Install a dispensing tip and follow calibration procedure
steps 3 to 5.
For consistent dispense valve operation and easy adjustment
of valve output, EFD recommends using the ValveMate
7000 controller on all automatic, semi-automatic and
benchtop applications.
The EFD Ultra TT Series positioning systems incorporate
dispensing control into the main system.
Contact the EFD Dispense Valve Systems Group for details.
For EFD sales and service in over 30 countries,
contact EFD or go to www.efd-inc.com/contact
EFD, Inc.
East Providence, RI USA
800-556-3484; [phone] (outside the USA)
[email protected] www.efd-inc.com
EFD International Inc.
Dunstable, Bedfordshire, UK
0800 585733 or [phone]
Ireland 00800 8272 9444
[email protected] www.efd-inc.com
EFD, Inc., Asia
China: [phone]
[email protected] www.efd-inc.com/cn
Singapore: [phone] [email protected]
©2006 Nordson Corporation 741MD-INSTALL-01 v062606
®
A NORDSON COMPANY