Danfoss Relief Valves Technical Information
Relief Valves Technical Information
Quick Reference
Thermal Relief |
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Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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CP208-4 |
SDC08-2 |
Relief Valve, |
1.1 l/min |
415 bar |
RV - 6 |
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Thermal Relief, |
[0.3 US gal/min] |
[6000 psi] |
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1 |
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2 |
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Poppet Type |
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Direct Acting
1 |
2 |
Direct Acting
1 |
2 |
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
CP208-3 |
SDC08-2 |
Relief Valve, |
30 l/min |
250 bar |
RV - 7 |
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Direct Acting, |
[8 US gal/min] |
[3600 psi] |
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CP200-3 |
SDC10-2 |
Poppet Type |
40 l/min |
250 bar |
RV - 8 |
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[11 US gal/min] |
[3600 psi] |
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Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
RV08-DR |
SDC08-2 |
Relief Valve, |
30 l/min |
250 bar |
RV - 9 |
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Direct Acting, |
[8 US gal/min] |
[3600 psi] |
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VEN 06 |
NCS06/2 |
Dampening, |
40 l/min |
250 bar |
RV - 10 |
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Poppet Type |
[11 US gal/min] |
[3600 psi] |
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VME 06 |
VME06 |
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40 l/min |
315 bar |
RV - 11 |
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[11 US gal/min] |
[4500 psi] |
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VME 07 |
VME07 |
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50 l/min |
315 bar |
RV - 12 |
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[13 US gal/min] |
[4500 psi] |
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VME 08 |
VME08 |
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80 l/min |
315 bar |
RV - 13 |
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[21 US gal/min] |
[4500 psi] |
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Differential Area |
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Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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CP200-2 |
SDC10-2 |
Relief Valve, |
40 l/min |
350 bar |
RV - 14 |
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Differential Area, |
[11 US gal/min] |
[5075 psi] |
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CP208-1 |
SDC08-2 |
Poppet Type, |
40 l/min |
250 bar |
RV - 15 |
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1 |
2 |
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[11 US gal/min] |
[3600 psi] |
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CP200-1 |
SDC10-2 |
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75 l/min |
250 bar |
RV - 16 |
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[20 US gal/min] |
[3600 psi] |
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CP201-1 |
CP12-2 |
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150 l/min |
250 bar |
RV - 17 |
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[40 US gal/min] |
[3600 psi] |
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BC332375370104en-000101 • February 2020 |
RV - 1 |
Direct Acting
1 |
2 |
Pilot Operated
Relief Valves Technical Information
Quick Reference
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
CP210-1 |
SDC10-2 |
Relief Valve, |
45 l/min |
210 bar |
RV - 18 |
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Direct Acting, |
[12 US gal/min] |
[3000 psi] |
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CP211-1 |
CP12-2 |
Spool Type, |
75 l/min |
40 bar |
RV - 19 |
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[20 US gal/min] |
[600 psi] |
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Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
CP210-2 |
SDC10-2 |
Relief Valve, |
115 l/min |
350 bar |
RV - 20 |
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Pilot Operated, |
[30 US gal/min] |
[5075 psi] |
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CP211-2 |
CP12-2 |
Spool Type |
190 l/min |
350 bar |
RV - 21 |
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[50 US gal/min] |
[5075 psi] |
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Pilot Operated |
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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RV10-POP |
SDC10-2 |
Relief Valve, |
120 l/min |
250 bar |
RV - 22 |
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Pilot Operated, |
[32 US gal/min] |
[3625 psi] |
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Poppet Type, with Free |
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1 |
2 |
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Reverse Flow |
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Bi-Directional |
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Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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CP200-7 |
SDC10-2 |
Relief Valve, |
40 l/min |
250 bar |
RV - 23 |
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Bi-directional |
[11 US gal/min] |
[3600 psi] |
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1 |
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2 |
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BC332375370104en-000101 • February 2020 |
RV - 2 |
Relief Valves Technical Information
Quick Reference
Differential Area |
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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VSB 06-EN |
NCS06/2 |
Relief Valve, |
80 l/min |
350 bar |
RV - 24 |
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Differential Area, |
[21 US gal/min] |
[5075 psi] |
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VSB 12-EN |
NCS12/2 |
Poppet Type with Reverse |
140 l/min |
350 bar |
RV - 25 |
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Free Flow Check |
[37 US gal/min] |
[5075 psi] |
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Differential Area |
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
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VSB 06-CN |
NCS06/2 |
Relief Valve, |
80 l/min |
350 bar |
RV - 26 |
2 |
1 |
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Differential Area, |
[21 US gal/min] |
[5075 psi] |
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VSB 12-CN |
NCS12/2 |
Poppet Type with Reverse |
140 l/min |
350 bar |
RV - 27 |
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ATM. |
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Free Flow Check, |
[37 US gal/min] |
[5075 psi] |
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Atmospheric Venting |
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Cross-Over
V1
V2
C1
C2
Model No. |
Cavity |
Description |
Flow |
Pressure |
Page |
VA-E 06 |
none |
Relief Valve, |
40 l/min |
210 bar |
RV - 28 |
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Cross-Over, Catalog HIC |
[11 US gal/min] |
[3045 psi] |
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CP220-1 |
none |
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75 l/min |
250 bar |
RV - 29 |
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[20 US gal/min] |
[3600 psi] |
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CP221-1 |
none |
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150 l/min |
250 bar |
RV - 30 |
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[40 US gal/min] |
[3600 psi] |
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BC332375370104en-000101 • February 2020 |
RV - 3 |
Relief Valves Technical Information
Application Notes
APPLICATIONS |
Relief valves are used as pressure limiting devices to protect hydraulic systems and |
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components. They are available in direct-acting poppet, differential area poppet, |
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bi-directional poppet, and pilot-operated spool types. |
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Relief valves |
OPERATION |
Direct-acting poppet |
Direct acting poppet relief valve |
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The direct-acting poppet blocks flow |
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from 1 to 2 until sufficient pressure is |
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present at 1 to force the spring-opposed |
1 |
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poppet from it’s seat. This pressure is |
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commonly known as the crack pressure. |
2 |
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The valve will remain open until the |
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pressure drops to a level allowing the |
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spring to close the valve. This pressure is known as the re-seat pressure and is typically 70-80% of the crack pressure. The difference between crack and re-seat pressure is commonly referred to as hysteresis.
Differential-area poppet
The differential area poppet operates in the same manner except flow is blocked from 2 to 1 until sufficient pressure is present at 2 to force the spring-opposed poppet from it’s seat.
Advantages of direct-acting poppet and |
Differential area poppet relief valve |
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differential area poppet relief valves are: |
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Fast response |
1 |
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Contamination tolerant |
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· Low leakage |
2 |
·Low cost
BC332375370104en-000101 • February 2020 |
RV - 4 |
Relief Valves Technical Information
Application Notes
OPERATION |
Because of these features some common applications for direct-acting and differential |
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(continued) |
area poppet relief valves are: |
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· Main system relief valve if flow is relatively constant, or as a safety relief valve for |
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“spike clipping” to protect components from overpressure |
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· Work port cross-over relief to protect a cylinder or motor from overpressure |
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System Relief Valve |
Work Port Cross-Relief Valves |
Bi-directional poppet |
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The bi-directional poppet is a dual |
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cross-over relief in a single cartridge. |
Bi-directional poppet relief valve |
When pressure at 1 exceeds the nominal |
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setting, the lower poppet acts as a |
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direct-acting relief valve and opens flow |
1 |
from 1 to 2. When pressure at 2 exceeds |
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the nominal setting, the upper poppet |
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acts as a differential area relief valve and |
2 |
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opens flow from 2 to 1 . Note that the |
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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 |
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The pilot operated spool blocks flow |
Pilot operated spool relief valve |
from 1 to 2 until sufficient pressure is |
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present at 1 to force the pilot poppet |
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off it’s seat. This creates a pressure |
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differential across the spool that causes |
1 |
the spool to shift and open flow from 1 |
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to 2. |
2 |
Advantages of pilot-operated relief valves are:
·Smooth, stable response
·High flow and high pressure capability
·Precise pressure control with varying flow rates. Low pressure rise
·Low hysteresis
A common application for pilot-operated relief valves is as a main system relief where high pressure or flow capability and/or extremely precise pressure control is required.
BC332375370104en-000101 • February 2020 |
RV - 5 |
Relief Valves Technical Information
Thermal Relief
CP208-4
OPERATION |
This is a direct-acting poppet type thermal relief valve that relieves from 1 to 2. |
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SPECIFICATIONS |
Theoretical performance |
Schematic |
DIMENSIONS mm [in]
psi |
bar |
154 SUS (33 cSt) hyd. oil @ 100° F (38° C) |
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6527 |
450 |
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5802 |
400 |
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5076 |
350 |
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4351 |
300 |
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3626 |
250 |
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2901 |
200 |
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2176 |
150 |
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1450 |
100 |
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725 |
50 |
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0 |
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L/min |
0.4 |
0.8 |
1.2 |
1.6 |
2 |
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Flow |
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US gal/min |
0.1 |
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0.2 |
0.3 |
0.4 |
0.5 |
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1 |
2 |
Specifications
Rated pressure |
415 bar [6000 psi] |
Rated flow |
1.1 l/min [0.3 US gal/min] |
Leakage |
10 drops/min @ 80% |
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of pressure setting |
Weight |
0.23 kg [0.50 lb] |
Cavity |
SDC08-2 |
Cross-sectional view
3/4-16 UNF |
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1.10 |
1.59 |
max. |
[27.8] |
[40.3] |
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Type E |
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adjustment |
1 |
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Type K |
2 |
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adjustment |
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h0.875 in |
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t27-34 N•m |
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[20-25 lbf•ft] |
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ORDERING INFORMATION
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CP208-4-B-4S-E-C-300 |
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Seals |
Seal kits |
Crack pressure |
B = Buna-N |
120221 |
Code x 10 = psi |
V = Viton |
120222 |
Example: 300 = 3000 psi |
Housing and ports |
Housing P/N |
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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
BC332375370104en-000101 • February 2020
Adjustment ranges |
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bar |
psi |
A = |
2-103 |
[30-1500] |
Standard |
207 |
[1000] |
B = |
7-207 |
[100-3000] |
Standard |
103 |
[1500] |
C = |
69-414 |
[1000-6000] |
Standard |
207 |
[3000] |
Adjustment options
E = External
K = Knob
RV - 6
OPERATION
SPECIFICATIONS
DIMENSIONS mm [in]
1
2
27.7
[1.09]
Relief Valves Technical Information
Direct Acting
CP208-3
This is a direct-acting poppet type relief valve that relieves from 1 to 2.
Theoretical performance
psi |
bar |
154 SUS (33 cSt) hyd. oil @ 100° F (38° C) |
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3 626 |
250 |
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2 901 |
200 |
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2 176 |
150 |
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1 450 |
100 |
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725 |
50 |
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0 |
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L/min |
8 |
16 |
24 |
32 |
40 |
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Flow |
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US gal/min |
2.1 |
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10.6 |
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4.2 |
6.3 |
8.5 |
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Cross-sectional view
3/4-16 UNF
Type A adjustment
Type F adjustment
43.4
[1.71]
Schematic
1 |
2 |
Specifications
Rated pressure |
250 bar [3600 psi] |
Rated flow |
30 l/min [8 US gal/min] |
Leakage |
10 drops/min @ 80% |
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of pressure setting |
Weight |
0.15 kg [0.32 lb] |
Cavity |
SDC08-2 |
h 0.875 in
t27-34 N.m [20-25 lbf.ft]
Type E adjustment
Type K adjustment
[2.69]68.3 max.
ORDERING INFORMATION
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CP208 - 3 - B - 6S - A - C - 150 |
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Seals |
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Seal Kit |
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B |
= |
Buna-N |
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120221 |
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V |
= |
Viton |
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120222 |
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Housing and ports |
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Housing P/N |
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0 |
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No Housing |
No Housing |
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DG2B |
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Al, 1/4 BSP |
SDC08-2-DG-2B |
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DG3B |
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Al, 3/8 BSP |
SDC08-2-DG-3B |
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4S |
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Al, #4 SAE |
CP08-2-4S |
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6S |
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Al, #6 SAE |
CP08-2-6S |
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Other housings available |
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Adjustment option |
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A |
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Internal |
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E |
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External |
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F |
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= |
Tamper resistant |
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K |
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Knob |
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Crack pressure
Code x 10 = psi
Example: 150 = 1500 psi
Pressure range |
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bar |
[psi] |
A |
= |
7-69 |
[100-1000] |
Standard |
28 |
[400] |
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B |
= |
14-138 |
[200-2000] |
Standard |
69 |
[1000] |
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C |
= |
35-248 |
[500-3600] |
Standard |
103 |
[1500] |
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BC332375370104en-000101 • February 2020 |
RV - 7 |
Relief Valves Technical Information
Direct Acting
CP200-3
OPERATION
SPECIFICATIONS
DIMENSIONS mm [in]
1
2
31.8
[1.25]
ORDERING INFORMATION
This is a direct-acting poppet type relief valve that relieves from 1 to 2.
Theoretical performance |
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Schematic |
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psi |
bar |
154 SUS (33 cSt) hyd. oil @ 100° F (38° C) |
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3 626 |
250 |
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1 |
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2 |
2 901 |
200 |
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2 176 |
150 |
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1 450 |
100 |
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Specifications |
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725 |
50 |
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Rated pressure |
250 bar [3600 psi] |
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0 |
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Rated flow |
40 l/min [11 US gal/min] |
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10 |
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L/min |
20 |
30 |
40 |
50 |
60 |
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Leakage |
10 drops/min @ 80% |
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Flow |
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US gal/min |
2.6 |
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15.9 |
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5.3 |
7.9 |
10.6 |
13.2 |
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of pressure setting |
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Weight |
0.21 kg [0.47 lb] |
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Cavity |
SDC10-2 |
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Cross-sectional view
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h |
1.00 in |
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7/8-14 UNF |
t |
41-47 N.m |
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[30-35 lbf.ft] |
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Type A |
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Type E |
adjustment |
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adjustment |
Type F |
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Type K |
adjustment |
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adjustment |
55.9 |
80.0 |
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max. |
[2.20] |
[3.15] |
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CP200 - 3 - B - 6 S - A - C - 150
Seals |
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Seal kit |
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B |
= |
Buna-N |
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120073 |
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V |
= |
Viton |
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120074 |
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Housing and port s |
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Housing P/N |
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0 |
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= |
No Housing |
No Housing |
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DG3B |
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= |
Al, 3/8 BSP |
SDC10-2-DG-3B |
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DG4B |
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= |
Al, ½ BSP |
SDC10-2-DG-4B |
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6S |
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= |
Al, #6 SAE |
CP10-2-6S |
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8S |
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= |
Al, #8 SAE |
CP10-2-8S |
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Other housings available |
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Adjustment option |
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A |
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= |
Internal |
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E |
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= |
External |
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F |
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= |
Tamper resistant |
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K |
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= |
Knob |
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Crack pressure
Code x 10 = psi
Example: 150 = 1500 psi
Pressure range |
bar |
[psi] |
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A |
= |
7-69 |
[100-1000] |
Standard |
28 |
[400] |
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B |
= |
17-172 |
[250-2500] |
Standard |
69 |
[1000] |
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C |
= |
41-248 |
[600-3600] |
Standard |
103 |
[1500] |
|
BC332375370104en-000101 • February 2020 |
RV - 8 |
OPERATION
SPECIFICATIONS
DIMENSIONS mm [in]
22mm
35-40 Nm [26-30 lbf*ft]
Type F
Adjustment
4mm |
6 [0.24] |
54.3 [2.14]
Relief Valves Technical Information
Direct Acting
RV08-DR
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 |
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Schematic |
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psi |
bar |
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26 cSt [121 SUS] hyd.oil@50°C [122°F] |
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3500 |
250 |
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3000 |
200 |
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1 |
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2 |
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2500 |
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2000 |
150 |
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1500 |
100 |
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1000 |
50 |
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500 |
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Specifications |
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0 |
0 |
0 |
5 |
10 |
15 20 |
25 |
30 l/min |
Rated pressure |
250 bar [3600 psi] |
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Rated flow |
30 l/min [8 US gal/min] |
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7.5 US gal/min |
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0 |
1.5 |
3 |
4.5 |
6 |
Leakage |
10 drops/min @ 80% |
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of pressure setting |
|||
|
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Weight |
0.10 kg [0.22 lb] |
|||
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Cavity |
SDC08-2 |
|||
Cross-sectional view
3/4-16 UNF 2A |
13mm |
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7-9 Nm [5-6 lbf*ft] |
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|
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|
Type K |
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Adjustment |
|
2 |
2 |
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1 |
1 |
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Ø30.0 [1.18] |
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Type E |
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Adjustment |
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47.5 [1.87] MAX. |
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30 [1.18] |
6mm |
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58.5 [2.30] MAX. |
ORDERING
INFORMATION
|
RV08-DR-1-E-XXX-B-4S |
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Pressure range |
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|
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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
Housing and ports |
Housing P/N |
||
00 |
= |
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 |
|
||
Seals |
|
Seal Kit |
|
B = Buna-N |
354000119 |
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V = Viton |
354000219 |
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|
BC332375370104en-000101 • February 2020 |
RV - 9 |
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