Ban Seok BV-520P User manual

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
TEL: [phone] / FAX: [phone] / E-MAIL: [e-mail] / WEB SITE: www.banseok.co.kr
BV
BV- -520P 520P
User Manual
User Manual

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
TEL: [phone] / FAX: [phone] / E-MAIL: [e-mail] / WEB SITE: www.banseok.co.kr
Contents
Contents
1. Specifications
2. Construction
3. How the Valve Operate
4. Stroke Control Reference
5. Setup
6. BV-520 Exploded View
7. Maintenance and Cleaning
8. Troubleshooting Guide
1. Specifications
1. Specifications
Size: 114.6mm x 26.9mm (4.510” x 1.060” diameter)
Weight: 300g
Fluid inlet thread: 1/8 PT Female
Fluid outlet: M3.5 x 0.6P TAP
Air pressure required: 4.8 bar (70 psi)
Maximum input fluid pressure: 21 bar (300 psi)
Mounting: 1/4-20 Thread UNC DP5 (Air Cylinder Body)
M6 x 1P DP5 TAP (Fluid Chamber)
Operation frequency: Exceeds 400 per minute
Output variation: +- 1% nominal
2. Construction
2. Construction
Air cylinder body: SUS 303
Fluid chamber: SUS 303
Piston: SUS 303
Needle: SUS 303
Tip adapter/needle seat: SUS 303
Needle packing: Teflon

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
TEL: [phone] / FAX: [phone] / E-MAIL: [e-mail] / 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 ①retracts the
piston and needle ②from 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.

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
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Mount the BV-520 valve with an appropriate fixture, using the ¼-
20 Thread UNC DP5 on the air cylinder body or using M6 x 1P
DP5 TAP on the fluid chamber.
Connect the control air line to the valve controller or other
pneumatic switch that is used to control operating air to the valve.
Connect the fluid feed hose to the fluid inlet fitting and fluid
reservoir.
The valve fluid chamber with inlet fitting can be rotated to prevent
possible interference with machine parts.
To reposition the fluid chamber, first turn the needle stroke control
out two full turns ①, then rotate the chamber ②to the desired
position.
5. Setup
5. Setup
①Set stroke
adjustment two full
turns out.
②Rotate fluid
chamber to
desired position.
Note: Do not rotate fluid
chamber more than one
complete turn.
Fill the fluid reservoir.
After filling, check to be certain the reservoir cover is secured and
that all connections are tight.
Set the reservoir pressure. For low viscosity fluids, start with a
pressure of approximately 0.3 bar (5 psi). For higher viscosity, use
1.4 to 2.8 bar (20 to 40 psi). Increase or decrease as necessary.
Note: If solvents or other watery fluids are to be dispensed in very
small amounts, specify 0 to 1.0 bar (0 to 15 psi) precision
regulator to control reservoir pressure.
Set the needle stroke. Start at one full turn open.
Set the valve control air pressure to 4.8 bar (70 psi).
Open the valve with an air pulse long enough to fill the valve and
start fluid flow. Then test the dispensed amount with a nominal
time setting.
Increase or decrease reservoir pressure, needle stroke and valve
open time to arrive at the desired deposit size.

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
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6. BV
6. BV- -520 Exploded View 520 Exploded View

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
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7. Maintenance and Cleaning
7. Maintenance and Cleaning
Normal cleaning is
accomplished by purging
with appropriate solvent. The
needle seat can be removed
(after the reservoir pressure
has been bled off) for
cleaning without demounting
the valve.
CAUTION:
CAUTION: Always relieve
the reservoir pressure and
disconnect the power before
performing any maintenance
on the system.
[Figure 2]
[Figure 2]
To thoroughly clean valve chamber and replace needle
packing:
1. Remove the needle stroke control and piston return spring to
prevent damage to the needle and seat during reassembly. Turn
counterclockwise until free.
2. Remove the inlet fitting and seat assembly from the fluid
chamber.
3. Remove the fluid chamber from the cylinder body by turning
counterclockwise until free. Then remove the O-ring from the fluid
chamber.
4. Remove the needle packings from the fluid chamber. Insert
through outlet end of the fluid chamber and gently push out the
packings (see Figure 1). – Packing extraction tool is not included.
[Figure 1]
[Figure 1] Do not use sharp instruments to scrape or clean these
components. Scratches may cause the valve to leak.
5. Remove any remaining packings and the packing spring from
the needle.
Note: The lower cylinder needle O-ring is held in place by a flat
retaining washer that also serves as the packing spring seat. The
washer may come out with the spring. Ensure that it is back in
place before reinstalling the packing spring (see Figure 2).
6. Clean the needle with a cloth dampened in solvent.
7. Lubricate the needle with lubricant. Reinstall the needle packing
spring and new packing kit in accordance with Figure 2.
8. Install a new O-ring on the fluid chamber. Screw the cylinder
onto the fluid chamber. Hand tighten only. The chamber can be
turned back out up to one turn to orient the fluid inlet fitting to the
desired position.
9. Reinstall the tip adapter/seat assembly.
10. To reinstall the piston return spring, first put one thrust washer
over the spring pilot (at the top of the piston), then the other thrust
washer into the needle stroke control, followed by the spring.
11. Reinstall the needle stroke control by aligning the piston return
spring with the spring pilot. Turn the needle stroke control
clockwise until it stops and then back it out the the desired setting.

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
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7. Maintenance and Cleaning
7. Maintenance and Cleaning
Note:
Note: After performing maintenance, the valve should be leak
tested before it is returned to service.
To leak test the valve:
To leak test the valve:
1. Set the needle stroke control knob at two turns open.
2. Shut off actuating air. Install an air hose in the valve’s fluid
inlet and connect it to a 7 bar (100 psi) air supply.
3. Submerge the needle seat and nozzle in a container of water.
If air bubbles appear, perform the following procedure to reseat
the parts:
To reseat the needle seat and nozzle assembly:
To reseat the needle seat and nozzle assembly:
1. Disconnect or shut off all air to the valve.
2. Open the needle stroke control two turns.
3. Using an appropriate wrench, loosen the needle seat one full
turn, then turn it back in and retighten. This causes any small
To replace the piston and needle assembly or piston O-ring:
1. Remove the needle stroke control by turning counterclockwise
until free.
2. Remove the piston return spring and thrust washers located on
each end of the spring.
3. Remove the snap ring using snap ring pliers.
4. Pull the piston and needle assembly out of the cylinder, using
small pliers on the spring pilot (at the top of the piston).
Note: The piston and needle assembly is replaced as a unit and
cannot be disassembled.
5. Clean the cylinder body wall and apply lubricant.
6. Replace the O-ring on the piston, apply lubricant, then reinstall
in the cylinder.
7. Reinstall the snap ring.
8. To reinstall the piston return spring, first put one thrust washer
over the spring pilot, then the other thrust washer into the needle
stroke control, followed by the spring.
9. Reinstall the needle stroke control by aligning the piston return
spring with the spring pilot. Turn the needle stroke control
clockwise until it stops and then back it out to the desired setting.
Note: Do not over tighten the needle stroke control, or needle
damage will occur.
irregularities on the needle and
seat to conform with one another
and become a matched set.
4. Restore actuating air and cycle
the valve a few times, then
perform the leak test again.
5. Steps 3 and 4 may be repeated
up to three times to obtain
satisfactory results.
6. If the valve continues to leak
after three attempts to reseat the
needle, replace the needle seat
and nozzle.

#656-253, Sungsu-1ka, Sungdong-ku, Seoul, Korea
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Inconsistent deposits can result if:
▶Air pressure controlling the valve is fluctuating.
▶Air pressure supplying the reservoir is fluctuating.
▶Air pressure controlling the valve is less than 4.8 bar (70 psi.)
▶Check to be sure the air pressures are constant and the valve operating air pressure is 4.8 bar (70 psi).
The time the valve is open must be constant.
▶Check to be sure the valve controller is providing a consistent output.
Inconsistent deposits.
▶Fluid leaking out the drain hole on the side of the valve indicates the needle packings are worn.
▶Replace needle packings.
Fluid leaks out the drain
hole
▶A steady drip can be caused by a worn needle and seat, or a particle holding the needle off the seat.
▶Remove the needle seat and nozzle, clean and inspect the needle and seat for wear. Replace worn or
damaged parts.
Steady drip.
▶Air operating pressure may be too low. Increase air pressure to 4.8 bar (70 psi).
▶The reservoir air pressure may not be high enough. Increase pressure.
▶The needle stroke adjustment may be closed. If it is closed, open counterclockwise one full turn.
▶Material may have clogged the valve head or output needle seat and nozzle.
▶Clean the valve. (Refer to Maintenance & Cleaning)
No fluid flow.
Possible cause and correction
Possible cause and correction
Valve Trouble
Valve Trouble
8. Troubleshooting Guide
8. Troubleshooting Guide