Check/Pilot Controlled Check Valves

Valve TypeGraphicSymbols

Max.
OperatingPressure
1MPa

Maximum Flow L/min
25

In-Line（CIT）
25

Check Valves

1020500203

06

Right Angle（CRT/CRG）

03

100

06

Right Angle, Flanged Connection（CRF）

Pilot Operated
Check Valves25

Threaded Connection（CP＊T）
Sub-plate Mounting（CP＊G）03
Flanged Connection（CP＊F）

T

PI＊F−40

CL

E-136
E-136

Page

10
E-137

101006500 1000 2000 5000

1624

10

E-143

1016P.P

25

In-Line Prefill Valves

200

Check/Pilot Controlled Check Valves5063 80 100

E-148

DIRECTIONAL CONTROLSIn-Line Check Valves
These valves allow free flow in one direction and prevent flow in the reverse direction. Cracking pressure specified is the pressure required
to open the valve and allow free flow.

Graphic Symbol

Model Numbers

Rated Flow★
L/min

CIT−02−＊−5016

CIT−03−＊−5030

CIT−06−＊−5085

CIT−10−＊−50230

Max. Operating Pres.
MPa

Cracking Pres.
MPaApprox. Masskg
0.1

0.04
250.3

0.35

0.8

0.5

2.3

★Rated flow is the approximate flow rate, when there is a free flow pressure drop of maximum 0.3 MPa, the fluid has a specific gravity of 0.85 and akinematic viscosity of 20 mm²/s, and the cracking pressure is 0.04 MPa.

In-Line Check Valves

E■ Specifications■ Model Number Designation
CIT−03−04−50

SeriesNumberType ofConnection

Valve
Size

Cracking Pressure
MPa

DesignNumberCＩ：
In-LineCheck ValveＴ：
Threaded
Connection

02
03
06
1050

04：0.0450

35：0.3550

50：0.550● For In-Line Check Valves, standard type (for petroleum base oils) can be used phosphate ester type fluid.

CIT−02, 03, 06, 10

B

Rc "D" Thd.
2 Places
Outlet PortA
Inlet PortIn-Line Check Valves

Model Numbers

AB

DCIT−02−＊−505819

CIT−03−＊−507627

CIT−06−＊−509541

CIT−10−＊−50133

60

1／43／83／41 1／4

E-137

■ Pressure Drop
Hydraulic Fluid: Viscosity 30 mm²/s

Pressure Drop

● CIT−02

MPa

CIT-02-50

0.6

CIT-02-35

0.4
0.2

0

CIT-02-04
51015

Flow Rate L/min

2025

Pressure Drop

● CIT−03

MPa

0.6

CIT-03-50

0.4
CIT-03-35

0.2

CIT-03-0401020

Flow Rate L/min

3040

Pressure Drop

● CIT−06

MPa

CIT-06-50

0.60.4

CIT-06-35

0.2

0

CIT-06-04
255075

Flow Rate L/min100125

Pressure Drop

● CIT−10MPa0.4
CIT-10-35

0.2

0E-138

CIT-10-50

0.6

CIT-10-0450100150200Flow Rate L/min

250300In-Line Check Valves

DIRECTIONAL CONTROLS

Right Angle Check Valves
These valves allow free flow in one direction and prevent flow in the reverse direction. Cracking pressure specified is the pressure required
to open the valve and allow free flow.

Graphic Symbol

Rated Flow★
L/min

Model Numbers
CRT−03−＊−5040

Threaded Connection

CRT−06−＊−50125

CRT−10−＊−50250

Sub-plate Mounting

CRG−03−＊−5040

CRG−06−＊−50125

CRG−10−＊−50250

Max. Operating Pres.
MPa

Cracking Pres.
MPa

Approx. Masskg0.04

0.9

0.35

1.7

0.5

5.6

0.04

1.7

0.35

2.9

0.5

5.52525★ Rated flow is the approximate flow rate, when there is a free flow pressure drop of maximum 0.3 MPa, the fluid has a specific gravity of 0.85 anda kinematic viscosity of 20 mm²/s, and the cracking pressure is 0.04 MPa.

■ Model Number Designation
CRT

−03

−04

−50Series
NumberType ofConnection

Valve
Size

Cracking Pressure
MPa

DesignNumber

CＲ：Right Angle
Check Valve

Ｔ：ThreadedConnection
Ｇ：Sub-plate
Mounting

03

5006

50

Model No.

50

CRF−10−＊−50

10030604：0.04
35：0.35
50：0.510505050Note) M odels for phosphate ester fluid are available. When phosphate ester fluid isused, prefix “F-” to the model number because the special seals (fluororubber)are required to be used.

CRG−03
CRG−06
CRG−10Rated Flow Max. Operating
L/minPres. MPa300

CRF−16−＊−50600

CRF−24−＊−501300

25■ Accessories● Mounting Bolts
Valve Model Numbers Socket Head Cap Screw■ Sub-plates
Valve
Model Numbers

Yuken can offer flanged connection
valves described below.
For details, contact us.

Sub-plateModel Numbers

CRGM−03−50

CRGM−03X−50
CRGM−06−50
CRGM−06X−50
CRGM−10−50
CRGM−10X−50

Thread SizeRc
3／81／23／
41

1 1／4
1 1／2

Approx. Masskg
1.6
1.6

ERight Angle Check Valves■ Specifications

Qty.

CRG−03

M10 × 45L

4CRG−06

M10 × 50L

4CRG−10

M10 × 55L

62.4
3.0
4.8
5.7

● Sub-plates are available. Specify the sub-plate model number from the tableabove. When sub-plates are not used, the mounting surface should have a goodmachined finish. (1.6 )Right Angle Check Valves

E-139

CRT−03, 06, 10A

FEC

D

Rc "H" Thd.
2 Places

C

Inlet Port

Outlet Port

B

Model Numbers

ＡＢ

Ｃ

ＤＥ

Ｆ

Ｈ

CRT−03623638 Dia.

80.5

33

44

CRT−0674

45

54 Dia.

104.5

49

54

CRT−10107

65

80 SQ.

130

65

80

3／83／4
1 1／4

CRG−03, 06

Outlet Port

H

6E

FREE

Locating Pin
6 Dia.

F

D

Inlet PortC

11 Dia. Through17.5 Dia. Spotface
4 PlacesBA

J

Model Numbers

ＡＢ

Ｃ

ＤＥＦＨＪ

Mounting surface conform to ISO
standard belowCRG−03

9066.7

11.7

72

42.9

17.5

72.5

30

ISO 5781−06−07−0−00

CRG−06

102

79.4

11.3

93

60.3

21.4

84.5

35

ISO 5781−08−10−0−00

Mounting Surface: ISO 5781-10-13-0-00

CRG−10Outlet Port

6Locating Pin
6 Dia.

FREE

42.1

84.1

97

20.3

123

Inlet Port

11.6

96.8
120

E-140

Mounting Surface(O-Rings Furnished)

11 Dia. Through17.5 Dia. Spotface
6 Places

Right Angle Check Valves

40

Mounting Surface(O-Rings Furnished)DIRECTIONAL CONTROLS● Sub-plate
CRGM−03, 03X

Sub-plateModel Numbers

66.7

1510

2119.5827.131.8

35.7

42.9

33.3

16Rc “A” Thd.
2 Places

7 Dia. Through10 Deep

CRGM−06, 06X

M10 Thd.
20 Deep
4 Places

15B

D

22104

16C

79.4
39.7

H

11.3

E

11.1

49.2

44.5

60.3

8.8 Dia. Through14 Dia. Spotface
4 Places

22 Dia. Through2 Places

A102

7 Dia. Through10 Deep

Sub-plateModel Numbers

ＡＢ

ＣＤ

Ｅ

Ｆ

CRGM−06−50

124

1077

2736

CRGM−06X−50

136

1682.322453／
4

CRGM−10, 10X

110

1130

E

7 Dia. Through10 Deep

AH

1911.6120

Sub-plateModel Numbers

BDC

2148.416.7

42.1

62.7

96.8

28 Dia. Through2 Places

126116
9.6

11 Dia. Through17.5 Dia. Spotface
4 Places

84.1

Ｈ

140
1267.5

Rc "F" Thd.
2 Places

E
Right Angle Check Valves

1.7

8.8 Dia. Through14 Dia. Spotface
4 Places

CRGM−03X−50

32

M10 Thd.
20 Deep
4 Places

3／81／261

70

90

10

CRGM−03−50

13 Dia. Through2 Places

10290

Ａ

Rc "F" Thd.
2 Places

M10 Thd.
20 Deep
6 Places

ＡＢ

ＣＤＥＦＨ

CRGM−10−5015012963045135

CRGM−10X−50

177

25.5

104

2250

11／4

Right Angle Check Valves11／2

167E-141

■ Pressure Drop

Hydraulic Fluid: Viscosity 30mm²/s● CRT−03● CRG−03MPa0.2

0.60.4

CRT-03-04

010

CRT-03-35

203040Flow Rate L/min

50

1.4
1.2
1.0
0.8
0.6
0.4
0.2

CRT-06-50

Pressure Drop

Pressure Drop

0.2

0.6
0.4

0

CRT-06-35

MPa

CRT-06-0450100150200

Flow Rate L/min

CRG-03-35

CRG-03-04
10

1.4
1.2
1.0
0.8
0.6
0.4
0.2

20304050

Flow Rate L/min60

CRG-06-50
CRG-06-35
CRG-06-04

0● CRT−10

Pressure Drop

MPa

CRG-03-50● CRG−060MPa

0.860● CRT−06

MPa

Pressure Drop

0.8

1.0

CRT-03-5050100150Flow Rate L/min

200● CRG−10

1.4
1.2
1.00.80.6
0.40.2

1.2
CRT-10-50
CRT-10-35
CRT-10-04
1000200300

Pressure Drop

Pressure Drop

1.01.0MPa0.2400Flow Rate L/min

CRG-10-50

0.8
0.6

CRG-10-35

0.4

CRG-10-04
1000200

300

Flow Rate L/min

400■ List of Seals
CRT−03, 06, 10574863

Item

Name of Parts

7O-Ring

Item

Name of Parts

7O-Ring

8O-Ring

2Part Numbers
CRT-03OR NBR-90
P21-N

CRT-06OR NBR-90
P24-N

CRT-10OR NBR-90
P32-N

Qty.
11

CRG−03, 06, 1057964321

Part Numbers
CRG−03

OR NBR-90
P21-N

OR NBR-90
P18-N

810E-142

Right Angle Check Valves

CRG−06OR NBR-90
P24-N

OR NBR-90
P28-N

CRG−10OR NBR-90
P32-N

OR NBR-90
P32-N

Qty.
12

DIRECTIONAL CONTROLS

Pilot Controlled Check Valves
These check valves allow flow in one direction and prevent flow in the reverse direction, until operated by pilot pressure to allow freereverse flow.

Graphic Symbols

External Drain TypeInternal Drain Type

Rated Flow★
L/minModel Numbers

Threaded Connection

Sub-plate Mounting

CP＊T−03−＊−＊−5040

CP＊T−06−＊−＊−50125

CP＊T−10−＊−＊−50250

CP＊G−03−＊−＊−5040

CP＊G−06−＊−＊−50125

CP＊G−10−＊−＊−50250

Max. Operating Pres.
MPa
2525

Cracking Pres.
MPaApprox. Masskg

0.04
0.2
0.35
0.5
0.04
0.2
0.35
0.5

3.0
5.5
9.6
3.3
5.4
8.5

★ Rated flow is the approximate flow rate, when there is a free flow pressure drop of maximum 0.3 MPa, the fluid has a specific gravity of 0.85 anda kinematic viscosity of 20 mm²/s, and the cracking pressure is 0.04 MPa.

■ Model Number Designatioin
CPT−03−E−04−50

Series Number

Type ofConnection

Valve
Size

Drain
Connection

Cracking Pres.
MPa

DesignNumber

CP：
Pilot Operated
Check Valve
CPD：
Decompression
Type Pilot
Operated
Check Valve03

Ｔ：Threaded
Connection

06
1003

G：Sub-plate
Mounting

0610

None：Internal
Drain

Ｅ：External
Drain

Pilot Controlled Check Valves

E■ Specifications

50
04：0.0450

20：0.250

35：0.3550

50：0.55050

Note) Models for phosphate ester fluid are available. When phosphate ester fluid is used, prefix “F-” to the model number because the special seals(fluororubber) are required to be used.

■ Accessories● Mounting Bolts
Valve Model Numbers Socket Head Cap Screw

Qty.

CP＊G−03

M10 × 45L

4

CP＊G−06

M10 × 50L

4

CP＊G−10

M10 × 55L

6Yuken can offer flanged connection valves
described below.
For details, contact us
Model Numbers

Rated Flow
L/minMax. Operating
Pres. MPa

CP＊F−10−＊−＊−50250

25

CP＊F−16−＊−＊−50600

25Pilot Controlled Check Valves

E-143

■ Instructions■ Sub-plates● Operation of internal and external drain types

Valve
Model Numbers

When the outlet side P₁ is directly connected to the tank in reversed
free flow (Fig. a), the internal drain type is normally used. Whenthe back pressure is applied to the outlet side P₁ (Fig. b), be sure touse the external drain type.

P2

3／
8
1／23／4

HGM−03X−20
HGM−06−20

CP＊G−06

DR

Thread Size
Rc

HGM−03−20

CP＊G−031

HGM−06X−20

1 1／4
1 1／2

HGM−10−20

CP＊G−10P2

Sub-plateModel Numbers

HGM−10X−20

1.6
2.4
3.0
4.8
5.7●S ub-plates are available, specify the sub-plate model number fromthe table above. When sub-plates are not used, the mounting surface
should have a good machined finish. (1.6 )P1● Sub-plates are shared with those for H Type Pressure Control Valves.
Refer to pages E-149 for dimensions.

P1

(a)

● Cautions on replacement of 20 design low cracking
pressure type valves with 50 design valves.

(b)

In 20 design valve with cracking pressure of 0.035 MPa (Code "5"),for closing the valve completely and certainly, it was necessary tointroduce the pressurized oil into the drain port to push down thepiston compulsory.
While in 50 design valve with cracking pressure of 0.04 MPa (Code"6"), it has such structure that the valve can be closed completely andcertainly without introducing the pressurized oil into the drain port.
On the contrary , what is worse is that if the pressurized oil is
introduced into the drain port, the oil acts towards the direction ofopening the valve, which is very dangerous and has to be absolutelyavoided. Therefore, please do not supply any pressurized oil into thedrain port in case of using 50 design valve.

● Minimum pilot pressure characteristics
That depends on the pressure of the inlet side P₂ in the reversed freeflow.
This value can be determined from the characteristics chart on page
E-146.

CPT−03, 06, 10
CPDT
H

JL

DFREE

F

Drain Port
Rc1/4 Thd.
(Machining only for external drain)

EKFree Flow Inlet or Reversed
Controlled Flow Outlet Port
Rc “N” Thd.

CA

E-144

Approx.
Mass kg

B

Free Flow Outlet or Reversed
Controlled Flow Inlet Port
Rc “N” Thd.

Pilot Port
Rc1/4 Thd.

Model Numbers

ＡＢ

ＣＤＥ

ＦＨ

ＪＫＬ

Ｎ

CP＊T−03804039150.5

84.5

38 Dia.

60

2967.5

26.5

CP＊T−06

9648

47

171.5

92.5

62 SQ.

72

3575.531

CP＊T−10

140

70

64

203.5

113

80 SQ.

82

4096

43

3／83／41 1／4

Pilot Controlled Check Valves

DIRECTIONAL CONTROLS
CPG−03, 06
CPDG

A

6JB

E

C

H

FREE

D

Locating Pin
6 Dia.

F

Drain Port

Pilot Port

11 Dia. Through17.5 Dia. Spotface
4 Places

Mounting Surface(O-Rings Furnished)

Free Flow Inlet or Reversed
Controlled Flow Outlet Port

Model Numbers

ＡＢＣＤＥＦＨＪ

CP＊G−03

90

66.7

11.7

150.5

42.9

666230

ISO 5781−06−07−0−00

CP＊G−06

102

79.4

11.3

171.5

60.3

67.5

7435

ISO 5781−08−10−0−00

Mounting Surface

Mounting Surface: ISO 5781-10-13-0-00

CPG
−10
CPDG

Free Flow Outlet or Reversed
Controlled Flow Inlet Port

119

84.1
70

203.5

96.8

11 Dia. Through17.5 Dia. Spotface
6 Places

640

Locating Pin
6 Dia.

42.1

11.1

Drain Port

89

E
Pilot Controlled Check Valves

Free Flow Outlet or Reversed
Controlled Flow Inlet Port

Pilot Port

Mounting Surface(O-Rings Furnished)

Free Flow Inlet or Reversed
Controlled Flow Outlet Port

Pilot Controlled Check Valves

E-145

■ Pressure Drop
Hydraulic Fluid: Viscosity 30 mm²/s● CPG−03, CPDG−03● CPT−03, CPDT−03

1.0

CP＊T-03-＊-50

CP＊T-03-＊-350.8

Pressure Drop

Pressure Drop

1.2

CP＊T-03-＊-20
CP＊T-03-＊-04

0.4

MPa
010

203040Flow Rate L/min

5060

CP＊T-06-＊-200.8

CP＊T-06-＊-04

0.4050

ReversedControlled Flow200

100150Flow Rate L/min

MPa

1.2
0.9

1.4
1.250

CP＊G-06-＊-50
CP＊G-06-＊-3560

CP＊G-06-＊-200.8

CP＊G-06-＊-040.42.0

CP＊T-10-＊-50
CP＊T-10-＊-35

CP＊T-10-＊-20

CP＊T-10-＊-040.6

MPa 0.30203040
Flow Rate L/min

ReversedControlled Flow

50100150
Flow Rate L/min

ReversedControlled Flow200● CPG−10, CPDG−10

Pressure Drop

Pressure Drop

1.5100● CPT−10, CPDT−10
1.8

CP＊G-03-＊-04

0

Pressure Drop

Pressure DropMPa

CP＊G-03-＊-200.4● CPG−06, CPDG−06

CP＊T-06-＊-50
CP＊T-06-＊-35

1.2

CP＊G-03-＊-50
CP＊G-03-＊-35

MPa

ReversedControlled Flow

● CPT−06, CPDT−06
1.60.8100200300Flow Rate L/min

400

1.61.2CP＊G-10-＊-50

CP＊G-10-＊-35
CP＊G-10-＊-20

CP＊G-10-＊-040.8

MPa 0.4

ReversedControlled Flow

0100200300
Flow Rate L/min

ReversedControlled Flow
400

■ Min. Pilot Pressure Chart

Min. Pilot Pressure (PP)

1210MPa

2Cracking Pressure
MPa
P2

80.5
0.04

P2
P1

P1PPPP

6

Cracking Pressure P2
MPa0.50.04

4A

051015P1
PP

2025

A : Min. Pilot Pressure to open the Decompression Valve(CPD : Decompression Type)Supply Pressure (P2) MPa■ Pressure Drop for Reversed Controlled Flow Only when Decompression Valve is Opened
Hydraulic Fluid: Viscosity 30 mm²/s

MPaE-146● CPDT−06, CPDG−06

0510 15 20
Flow Rate L/min25MPa

2520151050● CPDT−10, CPDG−10
Pressure Drop

252015105Pressure Drop

Pressure Drop

● CPDT−03, CPDG−03

10 20 30 40 50 60
Flow Rate L/min

Pilot Controlled Check ValvesMPa

252015105050100 150
Flow Rate L/min

200

DIRECTIONAL CONTROLS■ List of Seals
CPT−03, 06, 10

CPDT−03, 06, 1051211019416203212187178111315E9Item

Name of Parts

Part Numbers
CP＊T-03

CP＊T-06

CP＊T-10Qty.

11O-Ring

OR NBR-90 P7-N

OR NBR-90 P9-N

OR NBR-90 P9-N

112O-Ring

OR NBR-90 P21-N

OR NBR-90 P29-N

OR NBR-90 P36-N

113O-Ring

OR NBR-90 G25-N

OR NBR-90 P32-N

OR NBR-90 P42-N

1

CPG−03, 06, 10

CPDG−03, 06, 10514
14131920101237222232421Pilot Controlled Check Valves

66815916 18 11Item

Name of Parts

11Part Numbers

Qty.

CP＊G-03

CP＊G-06

CP＊G-10O-Ring

OR NBR-90 P7-N

OR NBR-90 P9-N

OR NBR-90 P9-N

112O-Ring

OR NBR-90 P9-N

OR NBR-90 P9-N

OR NBR-90 P9-N

213O-Ring

OR NBR-90 P18-N

OR NBR-90 P28-N

OR NBR-90 P32-N

214O-Ring

OR NBR-90 P21-N

OR NBR-90 P29-N

OR NBR-90 P36-N

115O-Ring

OR NBR-90 G25-N

OR NBR-90 P32-N

OR NBR-90 P42-N

1Pilot Controlled Check Valves

E-147

In-Line Prefill Valves
Prefill valves can be used by putting them between cylinder and reservoir insuch a hydraulic system for large presses and injection molding machines
where a high-speed operation is required with a small capacity pump.
In a high-speed forward stroke of the cylinder, the prefill valve sucks large
amount of oil from the reservoir and feeds it into the cylinder.
In pressurizing process, the valves prevent a reserve flow from the reservoir tothe cylinder, and in return stroke of the cylinder, the valve has a function ofdischarging the oil into the reservoir by opening the valve with a pilot pressure.
● Simple structure and high durability● Low pressure drop and large flow
● Direct and decompression types are available for all sizes.
● Slow return valves are optionally available for pilot ports.

(Example Diagram)● Ram Cylinder System (with auxiliary cylinder)
TP.P

CLGraphic Symbol〔Solenoid Shifting and Operation〕
Solenoid Rapid Increase
3142

T

Pressure Rapid Decrease❶ONOFFON❷

OFFONOFF❸ONONOFF❹OFFOFF

ON

P.P

CL

■ Specifications
Model Numbers

Piping Size

Max. Flow
L/min

PI＊F− 40−1065A

200

PI＊F− 50−1080A

400

PI＊F− 63−1090A

630

PI＊F− 80−10100A

1000

PI＊F−100−10125A

1600★1Max. Operating
Cracking Pressure
Pressure
MPa
MPa
0.011
250.012

Min. Pilot Pressure Ratio★2(Direct Type)
P-LinePressure

3.4：1

C-LinePressure

Pilot Volume
cm3
2.5

4.0：1

4.9

4.0：1

8.5

4.3：1

16.3

4.3：1

31.8

★1. Each maximum flow rate is an approximate value when the pressure drop at free flow is ⊿P≒0.03 MPa.
★2. The minimum pilot pressure ratio is determined by the area ratio between the seat and pressured part of the pilot. The decompression type is alsoavailable.

——— For details about In-Line Prefill Valves, refer to the model catalogues. ———E-148

In-Line Prefill Valves