Kofloc 2203 User manual

FJ400053D1
Created on 2021/12/20
Flow controller
Model 2203
Instruction Manual
Thank you for your selection of the “KOFLOC Flow Controller.”
Prior to using your new product, please read this manual thoroughly to ensure that your
new product will deliver its full performance.

FJ400053D1
Created on 2021/12/20
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CAUTION
This is a differential pressure regulator that keeps mass flows at a constant rate even
when the load pressure on the outlet side fluctuates and can be used at a pressure and
temperature up to:
Max. operating pressure ：0.8MPa(G)
Max. operating temperature ：60℃
The use of the valve with gases or toxic gases other than those specified on the valve
body or at a pressure exceeding the maximum allowable pressure may cause serious
injury. Such a way of use is strictly prohibited.
Foreword
Thank you for your selection of Model 2203.
・The contents of the manual are subject to change without prior notice.
・The manual has been carefully created and checked before shipment. If you notice
any deficiencies, errors or omissions, however, please inform us.
・The warranty period of the needle valve is one year from the date of shipment from
our plant.
・Any failures which may occur during this period and are attributable to our
workmanship will be corrected free of charge.
・KOFLOC shall bear no responsibility whatsoever for breakage or troubles of
equipment resulting from neglect of the precautions presented in this manual or use
of the needle valve in manners not described herein.

FJ400053D1
Created on 2021/12/20
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1. Features
This flow controller Model 2203 is a differential pressure regulator designed to control
minute gas flows precisely and to keep a certain constant flow rate. This control valve
keeps mass flows at a constant rate under a given constant level of supply pressure
even when the load pressure on the secondary side (outlet side) fluctuates. It
incorporates a diaphragm valve that compensates for changes in the load pressure
and a precision needle valve (same construction as Model 2412) that precisely
regulates flow.
2. Example of use
How to mount the controller on a panel
1) Remove the knob.
2) Loosen to remove the knurled nut with fingers. Remove one panel mounting nut,
insert the needle through the panel mounting hole (13) from the backside and
sandwich the panel with the mounting nuts to mount the body as shown.
Load
Flow controller
Constant
pressure
Pressure
regulating valve
Pressure gauge
Panel fitting nuts
Filter Unit
MODEL2300B
(Optional)
1/8”Swagelok
(Optional)

FJ400053D1
Created on 2021/12/20
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3. Other precautions
1) The optional filter unit is designed for minute flows. It will cause a large pressure
loss at a rate of 5 L/MIN or over and therefore should not be installed under such
conditions.
2) The gas connecting thread of Model 2203 body is M8 1, but a commercially
available joint (M8 1) cannot be installed directly. Please order for a conversion
joint (M8 1 + Rc 1/8 or M8 1 + Rc 1/4) dedicated to Model 2203.
3) A Swagelok tube fitting (1/8” tube, 1/4” tube) that can be installed directly on the
M8 1 female thread of Model 2203 body is also available.
4) When the joint is a Swagelok for 1/4”, install a dummy filter unit on the IN side
and shift the IN/OUT joint mounting positions so that the hex. cap nuts of the
joints will not interfere each other.
5) Be sure to stabilize the supply pressure (a gas pressure to be applied to IN) with a
regulator and apply a slightly higher pressure in consideration of a pressure loss.
If the primary side pressure fluctuates, the flow will not become stable. (See the
flow sheet).
6) Ensure that a pressure difference between the supply pressure and the outlet
pressure is 0.05 MPa or over. If the pressure difference is smaller, the flow will not
increase.
7) This flow controller is designed for gas only and cannot be used for liquids such as
water.
8) Zero stop is also possible but not guaranteed. Where exact zero stop is required,
use a stop valve.
9) Never allow dust/dirt, water, oil and other foreign matter to enter connecting
holes.
10) Do not turn the knob in the closing direction excessively. Or the internal orifice
will be damaged to disable control.

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Created on 2021/12/20
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【Specifications 】
Rated flow rate
10mL/min. up to 20L/min
Control accuracy
Fluctuation within 1.0% indicated valve of load
pressure fluctuation
(Inlet-to-outlet pressure difference 0.05MPa or over)
Adjust screw rotation
Approx. 12 tums
Max. operating pressure
0.8MPa
Max. operating temperature
60℃
Materials of areas in
contact with fluid
(A) Al, Brass, SUS316, POM, NBR
(SS) SUS316, PCTFE, FKM
Connection port
Rc1/8 (M8×1+Rc1/8)
＊The flow rates given above are based on a usage environment of 1atm,20℃, for
conversion of Air.
【Dimeasions (mm) 】
＜Connection fitting ＞(Optional)
Connecting side M8 1 male thread
1/8”Swagelok
(Optional)
φ8O.D.
hose nipple
JIS Rc1/8
MODEL2300B
Cut out
dimensions
M12×1
Body side
1/8”Swagelok
(Optional)
2-M8×1 female thread

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【Product Warranty Policy】
Thank you for your continued support of KOFLOC products.
Unless specified otherwise in quotations, contracts or specifications when you place
orders for KOFLOC products, the following warranty policy will apply.
Warranty Policy:
①Warranty period
The warranty period is one (1) year from shipment, provided that the product is
used within the KOFLOC specification.
②Scope of warranty
If the KOFLOC product fails during the warranty period due to a cause
attributable to KOFLOC, KOFLOC shall, at its option and expense, provide a
replacement product or repair the failed product at the KOFLOC factory.
This warranty, however, shall not cover damages due to a cause not attributable
to KOFLOC; opportunity loss, lost profit, secondary disaster, accident
compensation suffered by the customer and damage to other equipment and any
other damages due to a failure of the KOFLOC product.
③Non-warranty
The warranty shall not apply to the following failures and damages even if they
occur during the warranty period:
①Failure due to misuse or improper repair or modification. (Failures resulting
from use under conditions different from the manufacturing specifications are
included.)
②Damage and failure due to dropping of the product after purchase.
③Failure due to fire, earthquake, flood, lightning or other natural disaster; or
riot, war or the like.
④Failure due to intrusion of foreign matter from piping.
⑤Failure caused by a specific problem due to combination with other
incorporated equipment.
⑥Other failures and damages which are considered not attributable to
KOFLOC.
Please be aware that the warranty shall not cover opportunity loss suffered by
you or your customer or damage to other equipment or any other damages due
to a failure of the KOFLOC product.
URL：http://www.kofloc.co.jp