#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
TEL: 02-469-1239 / FAX: 02-497-1270 / E-MAIL: [email protected] / WEB SITE: www.banseok.co.kr
3. How the Valve Operate
3. How the Valve Operate
The BV-520 valve is a normally
closed, fail-safe, adjustable opening
needle valve.
The amount of fluid dispensed is
determined by length of time the
valve is open;fluid reservoir
pressure; needle stroke; and fluid
viscosity.
The BV-520 requires 4.8 bar (70
psi) air pressure. This air pressure
acting on the piston
①
retracts the
piston and needle
②
from the
needle seat
③
, permitting fluid flow
from the output
④
. Piston and
needle stroke and fluid flow are
controlled by the stroke control
knob
④
.
Once the cycle is complete, air is
exhausted back through the valve
controller, ensuring rapid and
positive fluid shutoff.
The BV-520 can be operated in any
position without affecting flow.
Vibration normally has no effect on
performance. The valve can be
moved in and out of dispense
position at high-cycle rates (such as
a reciprocation device installed on a
production line) without affecting
dispensing performance.
4. Stroke Control Reference
4. Stroke Control Reference
The Stroke Control
Reference feature is used
to calibrate the stroke
control setting or document
the dispensing process.
To calibrate the valve, the
stroke control knob is first
closed all the way. The set
screw is then loosened and
the stroke reference ring
turned so that the zero on
the reference ring is aligned
with one of the two
reference marks engraved
on the valve body. When
the set screw is tightened,
the valve is calibrated.
