Kofloc 6600 User manual

FJ400019I1
Created on 2021/12/20
- 1 -
Pressure Regulating Valve Model 6600
Large-flow Pressure Regulating Valve Model 6700
Instruction Manual
Foreword
Thank you for your selection of Model 6600/6700.
Prior to using your pressure regulating valve, please read this manual thoroughly to
ensure the valve will operate to its maximum performance.
・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 pressure regulating 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 pressure regulating valve in manners not described herein.

FJ400019I1
Created on 2021/12/20
- 2 -
■Model 6600
●Precautions for Handling
1) Installation
①Prior to connecting a pipe to the valve, be sure to flush the pipe. Dust/dirt, sand,
scale, etc. remaining inside the pipe are causes of malfunction and failure.
②When processing piping materials for connection, exercise extreme care. Sealing
material, produced chips, etc. remaining inside the pipe are causes of malfunction
and failure. When applying sealing material to the pipe, be sure that it will not
cover the first one turn of threads.
③The “IN”marking indicates the inlet of fluid and the “OUT”marking the outlet.
If the valve is installed in a wrong direction, it will not operate properly.
2) Pressure adjustment
①Low pressure to high pressure: While observing the secondary side pressure gauge,
turn the adjust knob of the pressure reducing valve clockwise.
②High pressure to low pressure: Because this valve is of non-bleed type, turn the
adjust knob counterclockwise, release the secondary side gas to the line with a stop
valve, etc., decrease the secondary pressure to below the desired pressure and then
turn the adjust knob clockwise to set the desired pressure.
3) Other precautions
①Use the pressure reducing valve within the range of the specifications.
②Prior to introducing gas, turn the adjust knob of the pressure reducing valve
counterclockwise to keep it loosened fully. Then introduce gas.
●Specifications
Primary side maximum pressure
0.8 MPa(G)
Secondary side control pressure
Type A : 0.01 －0.3 MPa(G)
Type B : 0.03 －0.6 MPa(G)
Minimum operating
pressure difference
0.05 MPa
Pressure resistance
0.8 MPa(G)
Reproducibility
Max. 1% of rated pressure
Temperature characteristic
Max. 1%/10℃of rated pressure
Environmental temp
5℃－60℃
Connecting port
Rc 1/4 (standard), Rc 1/8 (Optional)
Fluid contact materials
(A) Al, Brass, NBR, POM,SUS316 (Hard glass)
(SS) SUS316, SUS303, FKM, PCTFE (Hard glass)

FJ400019I1
Created on 2021/12/20
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●Construction and External Dimensions
1/ Pressure regulating shaft
2/ Cap nut
3/ Bonnet bearing
4/ Panel mounting nut
5/ Bonnet
6/ Bearing
7/ Pressure regulating spring
8/ M4 nut
9/ Diaphragm disc
10/ Diaphragm
11/ Retaining plate
12/ Filter
13/ Body
14/ Spring
15/ Ball
16/ O-ring
17/ O-ring
18/ Precision nozzle
19/ Stem
20/ Caulking
21/ Disc (small)
22/ Knob
Model
A
B
C
D
E
F
G
6600A
28
30.5
11
OUT
IN
10
37
6600B
31
30.5
11
OUT
IN
13
40
6600AL
28
33.5
14
IN
OUT
10
37
6600BL
31
33.5
14
IN
OUT
13
40
(mm)
Body side M8×1
Body side M8×1
(2 places)
Cut out dimensions

FJ400019I1
Created on 2021/12/20
- 4 -
■Model 6700
●Precautions for Handling
1) Installation
①Prior to connecting a pipe to the valve, be sure to flush the pipe. Dust/dirt, sand,
scale, etc. remaining inside the pipe are causes of malfunction and failure.
②When processing piping materials for connection, exercise extreme care. Sealing
material, produced chips, etc. remaining inside the pipe are causes of malfunction
and failure. When applying sealing material to the pipe, be sure that it will not
cover the first one turn of threads.
③The IN marking indicates the inlet of fluid and the OUT marking the outlet. If the
valve is installed in a wrong direction, it will not operate properly.
2) Pressure adjustment
①Low pressure to high pressure: While observing the secondary side pressure gauge,
turn the adjust knob of the pressure reducing valve clockwise.
②High pressure to low pressure: Because this valve is of non-bleed type, turn the
adjust knob counterclockwise, release the secondary side gas to the line with a stop
valve, etc., decrease the secondary pressure to below the desired pressure and then
turn the adjust knob clockwise to set the desired pressure.
3) Other precautions
①Use the pressure reducing valve within the range of the specifications.
②Prior to introducing gas, turn the adjust knob of the pressure reducing valve
counterclockwise to keep it loosened fully. Then introduce gas.
●Specifications
Primary side maximum pressure
0.9 MPa(G)
Secondary side control pressure
Type A : 0.01 －0.3 MPa(G)
Type B : 0.05 －0.6 MPa(G)
Minimum operating
pressure difference
0.05 MPa
Pressure resistance
1.0 MPa(G)
Reproducibility
1% of rated pressure
Environmental temperature
5℃－60℃
Connecting port
Rc 3/8 (standard)、Rc1/4 (Optional)
Fluid contact materials
(A) Al, Brass, SUS316, NBR, POM, FKM (SUS304)
(SS) SUS316, FKM, PCTFE (SUS304)

FJ400019I1
Created on 2021/12/20
- 5 -
●Construction and External Dimensions
The dimensions in parentheses are for Type B.
1/ Body
2/ Bonnet
3/ Pressure regulating shaft
4/ Bonnet bearing
5/ Bearing
6/ Pressure regulating spring
7/ Diaphragm caulking
8/ Diaphragm retaining plate
9/ M4 nut
10/ Diaphragm
11/ Stem
12/ Stem guide
13/ Nozzle
14/ Spring receiver
15/ Spring
16/ O-ring
17/ Cap nut
18/ Panel mounting nut
19/ Knob
Cut out dimensions

FJ400019I1
Created on 2021/12/20
- 6 -
●Troubleshooting (Model 6600)
Trouble
Cause
Corrective Action
The pressure
cannot be
adjusted.
1. The direction of flow is
reversed or the valve
installation is reversed.
2. The pressure regulating
spring has been broken.
3. The stem spring has been
broken.
4. Dust is adhering to the stem
O-ring.
5. The stem O-ring has been
damaged.
1. Check the direction of flow.
If it is reversed, reinstall the
valve correctly.
2. Please return it to us.
We’ll check it and repair it.
3. Please return it to us.
We’ll check it and repair it.
4. Please return it to us.
We’ll check it and repair it.
5. Please return it to us.
We’ll check it and repair it.
The set pressure
will not become
zero when the
pressure
regulating
handle is
loosened.
1. Dust is adhering to the stem
O-ring.
2. The stem O-ring has been
damaged.
3. The stem spring has been
broken.
1. Please return it to us.
We’ll check it and repair it.
2. Please return it to us.
We’ll check it and repair it.
3. Please return it to us.
We’ll check it and repair it.
Gas is leaking
from the small
hole of the
bonnet.
1. The diaphragm has been torn.
1. Please return it to us.
We’ll check it and repair it.
Gas is leaking
from around the
bonnet.
1. The bonnet is loose.
2. The diaphragm has been torn.
1. Retighten the bonnet.
2. Please return it to us.
We’ll check it and repair it.

FJ400019I1
Created on 2021/12/20
- 7 -
●Troubleshooting (Model 6700)
Trouble
Cause
Corrective Action
The pressure
cannot be
adjusted.
1. The direction of flow is
reversed or the valve
installation is reversed.
2. The pressure regulating
spring has been broken.
3. The stem spring has been
broken.
4. Dust is adhering to the stem
packing.
5. The stem packing has been
damaged.
1. Check the direction of flow.
If it is reversed, reinstall the
valve correctly.
2. Please return it to us.
We’ll check it and repair it.
3. Please return it to us.
We’ll check it and repair it.
4. Please return it to us.
We’ll check it and repair it.
5. Please return it to us.
We’ll check it and repair it.
The set pressure
will not become
zero when the
pressure
regulating
handle is
loosened.
1. Dust is adhering to the stem
packing.
2. The stem packing has been
damaged.
3. The stem spring has been
broken.
1. Please return it to us.
We’ll check it and repair it.
2. Please return it to us.
We’ll check it and repair it.
3. Please return it to us.
We’ll check it and repair it.
Gas is leaking
from the small
hole of the
bonnet.
1. The diaphragm has been torn.
1. Please return it to us.
We’ll check it and repair it.
Gas is leaking
from around the
bonnet.
1. The bonnet is loose.
2. The diaphragm has been torn.
1. Retighten the bonnet.
2. Please return it to us.
We’ll check it and repair it.

FJ400019I1
Created on 2021/12/20
- 8 -
●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:
a) Failure due to misuse or improper repair or modification. (Failures
resulting from use under conditions different from the manufacturing
specifications are included.)
b) Damage and failure due to dropping of the product after purchase.
c) Failure due to fire, earthquake, flood, lightning or other natural disaster; or
riot, war or the like.
d) Failure due to intrusion of foreign matter from piping.
e) Failure caused by a specific problem due to combination with other
incorporated equipment.
f) Other 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