Danfoss Relief Valves Technical Information

Relief Valves Technical Information

Quick Reference

Thermal Relief Model No. Cavity Description Flow Pressure Page

CP208-4 SDC08-2 Relief Valve,

Thermal Relief, Poppet Type

Direct Acting Model No. Cavity Description Flow Pressure Page

CP208-3 SDC08-2 Relief Valve,

Direct Acting,

CP200-3 SDC10-2 40 l/min

Poppet Type

1.1 l/min [0.3 US gal/min]

30 l/min [8 US gal/min]

[11 US gal/min]

415 bar [6000 psi]

250 bar [3600 psi] 250 bar [3600 psi]

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Direct Acting Model No. Cavity Description Flow Pressure Page

Quick Reference

Dierential Area Model No. Cavity Description Flow Pressure Page

RV08-DR SDC08-2 Relief Valve,

Direct Acting,

VEN 06 NCS06/2 40 l/min

VME 06 VME06 40 l/min

VME 07 VME07 50 l/min

VME 08 VME08 80 l/min

CP200-2 SDC10-2 Relief Valve,

CP208-1 SDC08-2 40 l/min

CP200-1 SDC10-2 75 l/min

CP201-1 CP12-2 150 l/min

Dampening, Poppet Type

Dierential Area, Poppet Type,

30 l/min [8 US gal/min]

[11 US gal/min]

[13 US gal/min]

[21 US gal/min]

40 l/min [11 US gal/min]

[11 US gal/min]

[20 US gal/min]

[40 US gal/min]

250 bar [3600 psi] 250 bar [3600 psi] 315 bar [4500 psi] 315 bar [4500 psi] 315 bar [4500 psi]

350 bar [5075 psi] 250 bar [3600 psi] 250 bar [3600 psi] 250 bar [3600 psi]

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Relief Valves Technical Information

Quick Reference

Direct Acting Model No. Cavity Description Flow Pressure Page

CP210-1 SDC10-2 Relief Valve,

Direct Acting,

CP211-1 CP12-2 75 l/min

Pilot Operated Model No. Cavity Description Flow Pressure Page

CP210-2 SDC10-2 Relief Valve,

CP211-2 CP12-2 190 l/min

Spool Type,

Pilot Operated, Spool Type

45 l/min [12 US gal/min]

[20 US gal/min]

115 l/min [30 US gal/min]

[50 US gal/min]

210 bar [3000 psi] 40 bar [600 psi]

350 bar [5075 psi] 350 bar [5075 psi]

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Pilot Operated Model No. Cavity Description Flow Pressure Page

RV10-POP SDC10-2 Relief Valve,

Pilot Operated, Poppet Type, with Free Reverse Flow

Bi-Directional Model No. Cavity Description Flow Pressure Page

CP200-7 SDC10-2 Relief Valve,

Bi-directional

120 l/min [32 US gal/min]

40 l/min [11 US gal/min]

250 bar [3625 psi]

250 bar [3600 psi]

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Quick Reference

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Relief Valves Technical Information

ATM.

Quick Reference

Dierential Area Model No. Cavity Description Flow Pressure Page

VSB 06-EN NCS06/2 Relief Valve,

Dierential Area,

VSB 12-EN NCS12/2 140 l/min

Poppet Type with Reverse Free Flow Check

Dierential Area Model No. Cavity Description Flow Pressure Page

VSB 06-CN NCS06/2 Relief Valve,

Dierential Area,

VSB 12-CN NCS12/2 140 l/min

Poppet Type with Reverse Free Flow Check, Atmospheric Venting

80 l/min [21 US gal/min]

[37 US gal/min]

80 l/min [21 US gal/min]

[37 US gal/min]

350 bar [5075 psi] 350 bar [5075 psi]

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Quick Reference

Cross-Over Model No. Cavity Description Flow Pressure Page

VA-E 06 none Relief Valve,

Cross-Over, Catalog HIC

CP220-1 none 75 l/min

CP221-1 none 150 l/min

40 l/min [11 US gal/min]

[20 US gal/min]

[40 US gal/min]

210 bar [3045 psi] 250 bar [3600 psi] 250 bar [3600 psi]

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Relief Valves Technical Information

Application Notes

APPLICATIONS

Relief valves are used as pressure limiting devices to protect hydraulic systems and components. They are available in direct-acting poppet, dierential area poppet, bi-directional poppet, and pilot-operated spool types.

Relief valves

OPERATION Direct-acting poppet

The direct-acting poppet blocks ow from 1 to 2 until sucient pressure is present at 1 to force the spring-opposed poppet from it’s seat. This pressure is commonly known as the crack pressure. The valve will remain open until the pressure drops to a level allowing the spring to close the valve. This pressure is known as the re-seat pressure and is typically 70-80% of the crack pressure. The dierence between crack and re-seat pressure is commonly referred to as hysteresis.

Dierential-area poppet

The dierential area poppet operates in the same manner except ow is blocked from 2 to 1 until sucient pressure is present at 2 to force the spring-opposed poppet from it’s seat.

Advantages of direct-acting poppet and dierential area poppet relief valves are:

· Fast response

· Contamination tolerant

· Low leakage

· Low cost

Direct acting poppet relief valve

Dierential area poppet relief valve

Applications Notes

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Relief Valves Technical Information

Application Notes

Applications Notes

OPERATION (continued)

Because of these features some common applications for direct-acting and dierential area poppet relief valves are:

· Main system relief valve if ow is relatively constant, or as a safety relief valve for “spike clipping” to protect components from overpressure

· Work port cross-over relief to protect a cylinder or motor from overpressure

System Relief Valve Work Port Cross-Relief Valves

Bi-directional poppet

The bi-directional poppet is a dual cross-over relief in a single cartridge.

Bi-directional poppet relief valve When pressure at 1 exceeds the nominal setting, the lower poppet acts as a direct-acting relief valve and opens ow from 1 to 2. When pressure at 2 exceeds the nominal setting, the upper poppet acts as a dierential area relief valve and

opens ow from 2 to 1 . Note that the valve is designed so that the crack pressure is the same in either direction

A common application for a bi-directional relief valve is as a work port cross-over relief where one bi-directional valve can replace two direct-acting valves.

Pilot operated spool

The pilot operated spool blocks ow

Pilot operated spool relief valve from 1 to 2 until sucient pressure is present at 1 to force the pilot poppet o it’s seat. This creates a pressure dierential across the spool that causes the spool to shift and open ow from 1 to 2.

Advantages of pilot-operated relief valves are:

· Smooth, stable response

· High ow and high pressure capability

· Precise pressure control with varying ow rates. Low pressure rise

· Low hysteresis

A common application for pilot-operated relief valves is as a main system relief where high pressure or ow capability and/or extremely precise pressure control is required.

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Relief Valves Technical Information

CP208-4-B-4S-E-C-300

K = Knob

Thermal Relief CP208-4

OPERATION

SPECIFICATIONS

DIMENSIONS

mm [in]

This is a direct-acting poppet type thermal relief valve that relieves from 1 to 2.

Theoretical performance Schematic

psi bar

6527

5802

5076

4351

3626

2901

2176

1450

154 SUS (33 cSt) hyd. oil @ 100° F (38° C)

450

400

350

300

250

200

150

100

50725

US gal/min

L/min

0.4

0.1

0.8 1.21.6 2 Flow

0.2 0.3 0.4 0.5

Specications

Rated pressure 415 bar [6000 psi] Rated ow 1.1 l/min [0.3 US gal/min] Leakage 10 drops/min @ 80%

of pressure setting

Weight 0.23 kg [0.50 lb]

Cavity SDC08-2

Cross-sectional view

3/4-16 UNF

ORDERING INFORMATION

Housing and portsHousing P/N

0=No Housing No Housing DG2B =Al, 1/4 BSP SDC08-2-DG-2B DG3B =Al, 3/8 BSP SDC08-2-DG-3B

4S =Al,#4 SAE CP08-2-4S 6S =Al,#6 SAE CP08-2-6S

Other housings available

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1.10

[27.8]

1.59

[40.3]

ht0.875 in

27-34 N•m [20-25 lbf•ft]

Seals Seal kits

B = Buna-N 120221 V =Viton 120222

max.

Type E adjustment

Type K adjustment

Crack pressure

Code x 10 = psi Example: 300 = 3000 psi

Adjustment ranges

bar psi A = 2-103 [30-1500] Standard 207 [1000]

7-207

Standard 103 [1500]

C =69-414 [1000-6000] Standard 207 [3000]

Adjustment options

100-3000]

E = External

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Relief Valves Technical Information

154 SUS (33 cSt) hyd. oil @ 100° F (38° C)

1 450

2 176

2 901

3 626

Adjustment option

[100-1000]

[200-2000]

[500-3600]

Seals

Housing and po

DG2 DG3

Direct Acting CP208-3

OPERATION

SPECIFICATIONS

DIMENSIONS

mm [in]

This is a direct-acting poppet type relief valve that relieves from 1 to 2.

Theoretical performance Schematic

psi bar

250

200

150

100

725

Specications

Rated pressure 250 bar [3600 psi]

8L/min

16 24 32 40

2.1US gal/min

Flow

4.2 6.3 8.5 10.

Rated ow 30 l/min [8 US gal/min] Leakage 10 drops/min @ 80%

of pressure setting

Weight 0.15 kg [0.32 lb]

Cavity SDC08-2

Cross-sectional view

ORDERING INFORMATION

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27.7

[1.09]

3/4-16 UNF

43.4

[1.71]

ther housings available

Type A adjustment

Type F adjustment

B=Buna-N 120221 V=Viton 120222

0=No Housing No Housing B=Al,1/4 BSP SDC08-2-DG-2B

B=Al,3/8 BSP SDC08-2-DG-3B 4S =Al, #4 SAE CP08-2-4S 6S =Al, #6 SAE CP08-2-6S

A= Internal

E= External

F= Tamper resistant

K= Knob

rtsHousing P/N

Seal Kit

ht0.875 in

27-34 N.m

[20-25 lbf.ft]

68.3 max.

[2.69]

CP208-3-B-6S-A-C - 150

Type E adjustment

Type K adjustment

Crack pressure

Code x 10 = psi Example: 150 = 1500 psi

Pressure range

A= 7-69 Standard 28 [400] B= 14-138 Standard 69 [1000] C= 35-248 Standard 103 [1500]

bar [psi]

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Relief Valves Technical Information

1 450

2 176

2 901

3 626

]

Seals

Housing and po

DG3 DG4

Direct Acting CP200-3

OPERATION

SPECIFICATIONS

DIMENSIONS

mm [in]

This is a direct-acting poppet type relief valve that relieves from 1 to 2.

Theoretical performance Schematic

psi bar

US gal/min

154 SUS (33 cSt) hyd. oil @ 100° F (38° C)

250

200

150

100

50725

L/min

20 30 40 50 60

2.6

5.3 7.9 10.6 13.2 15.

Flow

Specications

Rated pressure 250 bar [3600 psi] Rated ow 40 l/min [11 US gal/min] Leakage 10 drops/min @ 80%

of pressure setting

Weight 0.21 kg [0.47 lb]

Cavity SDC10-2

Cross-sectional view

7/8-14 UNF

31.8

[1.25]

55.9

[2.20]

ORDERING INFORMATION

B=Buna-N 120073 V=Viton120074

0=No Housing No Housing B=Al,3/8 BSP SDC10-2-DG-3B

B=Al,½ BSP SDC10-2-DG-4B 6S =Al, #6 SAE CP10-2-6S 8S =Al, #8 SAE CP10-2-8S

ther housings available

djustment option

A= Internal

E= External F= Tamper resistant

K= Knob

BC332375370104en-000101 • February 2020

Type A adjustment

Type F adjustment

CP200-3-B-6S-A-C - 150

Seal kit

rt s Housing P/N

h 1.00 in

41-47 N.m

[30-35 lbf.ft]

Type E adjustment

Type K adjustment

80.0 max.

[3.15]

Crack pressure

Code x 10 = psi Example: 150 = 1500 psi

Pressure range

A= 7-69 [100-1000 Standard 28 [400] B= 17-172 [250-2500 Standard 69 [1000] C= 41-248 [600-3600 Standard 103 [1500]

bar [psi]

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Relief Valves Technical Information

1500

1000

3000

2000

2500

3500

Direct Acting

RV08-DR

OPERATION

SPECIFICATIONS

DIMENSIONS

mm [in]

22mm

35-40 Nm [26-30 lbf*ft]

Type F Adjustment

This is a direct-acting, poppet-type relief valve that relieves from 1 to 2. It features a highly damped poppet for smooth and stable response.

Theoretical performance Schematic

psi

bar

26 cSt[121 SUS]hyd.oil@50°C[122°F]

250

200

150

100

500

1.5

4.5

US gal/mi

7.5

l/min

Specications

Rated pressure 250 bar [3600 psi] Rated ow 30 l/min [8 US gal/min] Leakage 10 drops/min @ 80%

of pressure setting

Weight 0.10 kg [0.22 lb]

Cavity SDC08-2

Cross-sectional view

3/4-16 UNF 2A

Type K Adjustment

13mm

7-9Nm [5-6 lbf*ft]

4mm

6 [0.24]

30 [1.18]54.3 [2.14]

ORDERING INFORMATION

Pressure range

1 = 20-80 Bar [290-1150 psi] 2 = 35-160 Bar [500-2300 psi] 3 = 60-250 Bar [870-3600 psi]

Adjustment option

E = External F =Tamper resistant K = Knob

Crack pressure

Code = Setting in Bar

XXX = No specific setting

BC332375370104en-000101 • February 2020

Ø30.0 [1.18]

6mm

RV08-DR-1-E-XXX-B-4S

Type E Adjustment

47.5 [1.87] MAX.

58.5 [2.30] MAX.

Housing and portsHousing P/N

00 =No Housing No Housing DG2B= Al,1/4 BSPSDC08-2-DG-2B DG3B= Al,3/8 BSPSDC08-2-DG-3B

4S =Al, #4 SAE CP08-2-4S

6S =Al, #6 SAE CP08-2-6S Other housings available

Seals Seal Kit B = Buna-N 354000119 V =Viton 354000219

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+ 21 hidden pages

Danfoss Relief Valves Technical Information

Specifications and Main Features

Frequently Asked Questions

User Manual