Nordson-EFD-794-Operating-Manual.pdf - 第5页
794 Series Auger Valve | Operating Manual 5 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. How the V alve Operates Input air pressure a…
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
794 Series Auger Valve | Operating Manual
6 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Specifications
NOTE: Specifications and technical details are subject to engineering changes without prior notification.
Item Specification
Size 237.5 mm length x 31.8 mm diameter (9.35 x 1.25")
Weight 544.0 g (19.2 oz)
Auger speed (dry) 250–500 RPM based on voltage input
Auger pitch 8, 16
Input voltage 10–24 VDC (<10% ripple)
Maximum acceleration 2.0 g (0.07 oz)
Maximum continuous current 240 mA
Input air pressure 0–2.07 bar (0–30 psi)
Maximum fluid pressure 2 bar (30 psi)
Fluid inlet 304 stainless steel, #10-32 UNF x 5/32"
Optional push-in fitting: Polypropylene
Mounting 10-32, low profile
Fluid body 440C hardened stainless steel
Auger 440C hardened stainless steel
Approvals China RoHS
All stainless steel parts are passivated.
RoHS标准相关声明标准相关声明 (China RoHS Hazardous Material Declaration)
产品名称
Part Name
有害物质及元素
Toxic or Hazardous Substances and Elements
铅
Lead
(Pb)
汞
Mercury
(Hg)
镉
Cadmium
(Cd)
六价铬
Hexavalent
Chromium
(Cr6)
多溴联苯
Polybrominated
Biphenyls
(PBB)
多溴联苯醚
Polybrominated
Diphenyl Ethers
(PBDE)
外部接口
External Electrical
Connectors
X 0 0 0 0 0
O: 表示该产品所含有的危险成分或有害物质含量依照EIP-A, EIP-B, EIP-C
的标准低于SJ/T11363-2006 限定要求。
Indicates that this toxic or hazardous substance contained in all the homogeneous materials for this part, according to EIP-A, EIP-B, EIP-C is below the
limit requirement in SJ/T11363-2006.
X: 表示该产品所含有的危险成分或有害物质含量依照EIP-A, EIP-B, EIP-C
的标准高于SJ/T11363-2006 限定要求.
Indicates that this toxic or hazardous substance contained in all the homogeneous materials for this part, according to EIP-A, EIP-B, EIP-C is above the
limit requirement in SJ/T11363-2006.