For High PressureSpecifications
Special steel (Nickel plated)

Body material

3/8", 1/2", 3/4", 1"

Size (Thread)

Flat Face Cupla FF
For hydraulic pressure up to 35.0 MPa {357 kgf/cm2} with flat contact face
Working pressure

Valve structure

Applicable fluid

Pressure unitMPa

kgf/cm2

bar

PSI

Working pressure

35.0357

350

5080
Remarks

Seal material
Working temperature range

Seal material

Mark

Workingtemperature range

Nitrile rubber

NBR-20˚C to +80˚C Standard material

3/8"

1/2"

3/4"

1"

40 {408}

80 {816}150 {1530}

250 {2550}

Max. Tightening TorqueSize (Thread)

35.0
35.0 MPa{357 kgf/cm2}

TorqueTwo-way shut-off(Non-Spill)

Hydraulic oil

Nm {kgf • cm}

Flow Direction
Fluid flow can be bi-directional when socket and plug are connected.

Compared with Nitto Kohki’s
conventional 35 MPa Cuplas, the flow
volume is increased 1.5 to 2 times.
*Increase ratio of each flow volume depends on the Cupla size.

• "Airless valve shut-off" design minimizes spillage volume on disconnection
and admixture volume of air on connection.
• Best suited for hydraulic lines with drastic high pressure pulsation such as indie-casting machines.
• Sleeve stopper design preventing accidental disconnection under vibration
or impacts enhances workability and safety.
• Sizes are Rc 3/8, Rc 1/2, Rc 3/4, and Rc 1.
*Only the same size ofsocket and plug canbe connected.

Interchangeability
Different size socket and plug cannot be connected each other.

(mm2)

Min. Cross-Sectional Area

FF-3S x FF-3P FF-4S x FF-4P FF-6S x FF-6P FF-8S x FF-8P

Model51

Min. cross-sectional area

106215332

Suitability for Vacuum
Not suitable for vacuum application in either connected or disconnected condition.

Admixture of Air on Connection May vary depending upon the usage conditions.

( mL)

FF-3S x FF-3P FF-4S x FF-4P FF-6S x FF-6P FF-8S x FF-8P

Model

0.018

Volume of air admixture

0.029

0.033

Volume of Spillage per Disconnection May vary depending upon the usage conditions.

0.080

(mL)

FF-3S x FF-3P FF-4S x FF-4P FF-6S x FF-6P FF-8S x FF-8P

Model

0.009

Volume of spillage

0.023

0.031

0.110

Flow Rate – Pressure Loss Characteristics[Test conditions]• Fluid : Hydraulic oil • Temperature : 30˚C 5˚C•Fluid viscosity : 32 x 10-6 m2/s •Density : 0.87 x 103 kg/m3

1.0 {10}

Pressure loss in MPa {kgf/cm2}

FF-3S x FF-3P
FF-4S x FF-4P
FF-6S x FF-6P
FF-8S x FF-8P

Offset concave flat face enables quick and smooth connection

0.1 {1}0.01 {0.1}1101001000

Flow rate in L/min

Unique flat face design
Concaved offset for the flat face on socket
guides plug for quick and smoothcentering and connection, but still easy
to wipe off dirt and dusts.

Hexagon nut for easy mountPrecautions for use
Do not connect / disconnect Cuplas when pressure is applied or remaining.

97

Flat Face Cupla FF
Models and Dimensions

Plug

WAF : WAF stands for width across flats.

Female thread

SocketFemale thread

DT

DT

L

H

Model

Application

Mass (g)

FF-3P
FF-4P
FF-6P
FF-8P

R 3/8
R 1/2
R 3/4
R1

252
409
709
1314

AL
Dimensions (mm)

L(66)
(74)
(82.5)(96.5)

øD34
42
54
66

A
20.5
22.8
27
29.5

H (WAF)
Hex.29Hex.32
Hex.41Hex.54

T
Rc 3/8Rc 1/2
Rc 3/4
Rc 1

Model

Application

Mass (g)

FF-3S
FF-4S
FF-6S
FF-8S

R 3/8
R 1/2
R 3/4
R1345
608
1053
1865

HDimensions (mm)

L
(71)
(84)
(95)
(109.5)

øD(35.5)
(44)
(54)
(66)

H (WAF)
Hex.29Hex.32
Hex.41
Hex.54T
Rc 3/8Rc 1/2
Rc 3/4
Rc 1

Applications• Hydraulic piping for die-casting machines• Casting machines• Electric furnaces• Molding presses• Forging press• Powdery alloy presses• Extrusion molding machines• Machine tools• Iron manufacturing blast furnaces• Continuous casting machines• Rolling mills• Pipe forging machines• Furnace opening / closing machines• Glass molding machines, etc.

Built-in automatic shut-off valve
Sleeve stopper design
Unique flat face design

Built-in automatic shut-off valve

Before use, please be sure to read “Safety Guide” described at the end of this book and “Instruction Sheet” that comes with the products.

98