Nordson-EFD-794-Operating-Manual.pdf - 第4页
794 Series Auger Valve | Operating Manual 4 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. Intr oduction The 794 Auger Valve is a preci…
794 Series Auger Valve | Operating Manual
3www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Contents
Contents ........................................................................................................................................................................................ 3
Introduction ...................................................................................................................................................................................4
General Information ...................................................................................................................................................................4
Valve Models .............................................................................................................................................................................5
How the Valve Operates ............................................................................................................................................................ 5
Specifications ................................................................................................................................................................................ 6
Packing List ................................................................................................................................................................................... 7
Installation .....................................................................................................................................................................................8
Making Adjustments .................................................................................................................................................................. 8
Changing a Tip ...........................................................................................................................................................................9
Changing the Auger Assembly ..................................................................................................................................................9
Solder Paste ................................................................................................................................................................................ 10
Service .........................................................................................................................................................................................10
Valve Part Numbers .....................................................................................................................................................................10
Replacement Parts ...................................................................................................................................................................... 10
Troubleshooting ..........................................................................................................................................................................11
794 Series Auger Valve | Operating Manual
4 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Introduction
The 794 Auger Valve is a precision dispense valve specifically designed for metering
controlled deposits of solder pastes, thick sealants, and other particle-filled materials.
By combining screw-feed principles with precise time, pressure, and dispensing control,
the 794 valve is able to provide accurate, repeatable deposits without damaging the
metal particles of the solder. These features are not possible with any other type of
conventional control valve.
General Information
It is intended that the 794 auger valve be rigidly mounted to and positioned by a
suitable factory automation system and controlled by a suitable valve controller. See the
“Specifications” section of this manual to select, install, and configure the automation
system and valve controller.
Prohibited Uses
The 794 auger valve should not be operated in the following ways:
• Hand-held
• In damp or wet conditions
• In explosive atmospheres
• Under conditions which violate limits set under “Specifications” on page6
• Without all system guards, interlocks, and other safety features in place and
operational
Warning
It is the responsibility of the factory automation system designer, builder, and / or installer
to include safety features sufficient to prevent personal injury or loss of life during
operation.
Safety Precautions
The 794 auger valve should be installed, configured, and operated only by qualified
personnel who have read and understood all appropriate sections of this manual as well
as the operating instructions supplied with the factory automation system onto which it
is installed. Protective eyewear should always be worn while operating, adjusting, and
servicing the valve. Additional personal protective equipment should be used appropriate
to the material being dispensed. An SDS for all materials to be dispensed should be
available at or near the operator’s station. The factory automation system should be
designed and installed so as to allow the operator to be positioned at a safe distance
while operating and adjusting the valve.
794 Series Auger Valve | Operating Manual
5www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
How the Valve Operates
Input air pressure at up to 2.1 bar (30 psi) is applied to the material
reservoir
1
, forcing fluid into the path of the auger. As the auger
rotates, fluid moves along the auger flutes
2
and is forced out
through the dispense orifice. The valve controller regulates the
reservoir pressure, ensuring that there is enough pressure to keep
the valve primed with fluid without forcing it past the auger. The
duration of the dispensing time is controlled by adjusting the time
control up or down until the required deposit size is established, at
which point it is repeated with each initiate cycle.
2
1
Valve Models
• 794-FR: 8 pitch, brush motor, fixed head
• 794-FR-16: 16 pitch, brush motor, fixed head