Pilot Operated Check Valves Technical Information
Quick Reference
Pilot to Open |
Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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RPC04 |
NCS04/3 |
Pilot Operated Check |
20.5 l/min |
350 bar |
PO - 6 |
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Valve, Pilot to Open |
[5.4 US gal/min] |
[5075 psi] |
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RPC06 |
NCS06/3 |
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35 l/min |
350 bar |
PO - 7 |
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[9.3 US gal/min] |
[5075 psi] |
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CP450-1 |
SDC10-3 |
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30 l/min |
240 bar |
PO - 8 |
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[8 US gal/min] |
[3480 psi] |
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RPC12 |
NCS12/3 |
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90 l/min |
315 bar |
PO - 9 |
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[23.8 US gal/min] |
[4570 psi] |
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Pilot to Open |
Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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CP458-2 |
SDC08-3 |
Pilot Operated Check |
20 l/min |
210 bar |
PO - 10 |
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Valve, Reverse Pilot to |
[5 US gal/min] |
[3000 psi] |
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MC10-RO |
SDC10-3S |
Open |
45 l/min |
250 bar |
PO - 11 |
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[12 US gal/min] |
[3600 psi] |
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CP451-2 |
CP12-3S |
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95 l/min |
210 bar |
PO - 12 |
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[25 US gal/min] |
[3000 psi] |
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CP452-2 |
SDC16-3S |
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130 l/min |
210 bar |
PO - 13 |
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[34 US gal/min] |
[3000 psi] |
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CP453-2 |
CP20-3S |
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230 l/min |
210 bar |
PO - 14 |
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[61 US gal/min] |
[3000 psi] |
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Pilot to Open |
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Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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RPV 06 |
NCS06/4 |
Pilot Operated Check |
30 l/min |
315 bar |
PO - 15 |
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Drain |
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Valve, Pilot-to-open with |
[8 US gal/min] |
[4500 psi] |
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drain |
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* Flow ratings are based on a pressure drop of 7 bar [100 psi] unless otherwise noted. They are for comparison purposes only.
BC332375625108en-000101 • February 2020 |
PO - 1 |
Pilot Operated Check Valves Technical Information
Quick Reference
Symbol |
Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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CP453-5 |
SDC20-2 |
Pilot Operated Check |
250 l/min |
350 bar |
PO - 16 |
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Valve, Reverse Pilot-to- |
[66 US gal/min] |
[5075 psi] |
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open with vent |
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Pilot to Close |
Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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CP460-1 |
SDC10-3 |
Pilot Operated Check |
45 l/min |
210 bar |
PO - 17 |
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Valve, Pilot to Close |
[12 US gal/min] |
[3000 psi] |
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CP461-1 |
CP12-3S |
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115 l/min |
210 bar |
PO - 18 |
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[30 US gal/min] |
[3000 psi] |
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CP462-1 |
SDC16-3S |
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190 l/min |
210 bar |
PO - 19 |
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[50 US gal/min] |
[3000 psi] |
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Dual Pilot-Operated Checks |
Model No. |
Cavity |
Description |
Flow* |
Pressure |
Page |
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CP410-1 |
none |
Pilot Operated Check |
80 l/min |
210 bar |
PO - 20 |
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Valve, Catalog HIC |
[21.1 US gal/min] |
[3000 psi] |
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* Flow ratings are based on a pressure drop of 7 bar [100 psi] unless otherwise noted. They are for comparison purposes only.
BC332375625108en-000101 • February 2020 |
PO - 2 |
Pilot Operated Check Valves Technical Information
Application Notes
MOTION CONTROL |
Motion control valves, also referred to as load holding valves, are used to control the |
VALVES |
motion of a load in the following ways: |
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· Prevent a load from dropping in case of hose or tube failure. |
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· Prevent a load from drifting caused by directional control valve spool leakage. |
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· Provide smooth, modulated motion when the load is in a lowering or run-away |
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mode. |
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· Provide smooth, modulated motion when the directional control valve is suddenly |
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closed. |
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There are two basic types of motion control valves: |
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· Pilot-operated, or pilot-to-open check valves will satisfy the first two of the above |
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requirements. |
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· Counterbalance valves will satisfy all four of the above requirements. |
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Pilot operated check valves |
BC332375625108en-000101 • February 2020 |
PO - 3 |
Pilot Operated Check Valves Technical Information
Application Notes
PILOT-OPERATED CHECK |
Pilot-operated, or pilot-to-open check |
Individual cartridges |
VALVES |
valves will positively hold a pressurized |
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load and will release the load upon |
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application of a pressure signal to the |
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pilot port. Pilot-operated check valves |
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are available as individual cartridges, |
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standard Cartridge-In-Body (CIB) |
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packages, or can be created in custom |
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manifolds by using a standard check |
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valve such as CV10-NP with a guided |
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pilot piston. For more information on |
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pilot pistons, see Accessories. |
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Cartridge in body |
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A typical circuit application for pilot- |
Typical circuit application |
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operated check valves contains a pump, |
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W |
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W |
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directional control valve, and an actuator. |
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Without a pilot-operated check valve the |
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load will drift down due to spool leakage |
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if the directional control valve is centered |
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with the load raised. Additionally |
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there is no protection against the load |
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dropping in the event of hydraulic line |
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failure. Adding a pilot-operated check |
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valve helps prevent cylinder drift and |
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provides protection against hose or |
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tube failure. In this circuit, moving the |
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directional control valve to the right |
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causes the cylinder to extend. When the |
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directional control valve is centered, the |
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pilot-operated check valve will prevent |
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leakage and lock the cylinder in position. Moving the directional control valve to the right sends pressure/flow to the rod end of the cylinder. This pressure also acts on the pilot piston to open the check valve and allow the load to be lowered.
BC332375625108en-000101 • February 2020 |
PO - 4 |
Pilot Operated Check Valves Technical Information
Application Notes
PILOT-OPERATED CHECK VALVES
(continued)
The pressure required to pilot open the check valve can be calculated by:
P = W + (Pc • Ab) |
cylinder retracts |
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(Ab • R) - Ar |
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P = W + (Pc • Ar) |
cylinder extends |
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(Ar • R) - Ab |
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W |
= Load |
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Pc |
= Check valve crack pressure (typically 0.34-4.5 bar [5-65 psi]; consult catalog sheets |
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for details) |
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Ab |
= Cylinder bore area |
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Ar |
= Cylinder rod area |
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R |
= Check valve pilot ratio (typically 3:1 or 4:1; consult catalog sheets for details) |
Note that these equations are idealized and do not consider any backpressure in the circuit, which is additive to the pressure required to pilot open the check valve.
Some additional guidelines for pilot-operated check valve applications:
·Use pilot-operated check valves for load holding, not for motion (speed) control. Pilot-operated check valves are on-off, non-modulating devices. Trying to
use a pilot-operated check valve to control an overrunning load can result in severely unstable motion. For motion (speed) control of overrunning loads, use a counterbalance valve.
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Use caution when applying pilot- |
Closed center, directional control valves |
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Do |
Do not |
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operated check valves to the rod end of a cylinder. Cylinders with large rod:bore diameter ratios may intensify rod pressure to a point where the required pilot pressure may be dangerously high—
refer to the above equations. If intensification creates application concerns, consider using a counterbalance valve.
·Do not use pilot-operated check valves with closed-center, directional control valves. Pressure trapped between the directional control valve and the pilot-operated check valve can pilot the check valve open and result in undesired load motion.
·Locate pilot-operated check valves at or near the actuator to provide maximum load holding protection in the event of hydraulic line failure.
BC332375625108en-000101 • February 2020 |
PO - 5 |
Pilot Operated Check Valves Technical Information
Pilot to Open RPC04
OPERATION |
This is a pilot-to-open check valve. |
SPECIFICATIONS |
Theoretical performance |
Pressure drop
26 cSt [121 SUS] hyd.oil at 50ƱC [122 ƱF] psi bar
150 10
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8 |
3-2 |
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100 |
6 |
2-3 |
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0 |
0 |
5 |
10 |
15 |
20 |
25 |
30 l/min |
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0 |
2 |
4 |
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6 |
8 gal/min |
Schematic
Specifications
Rated pressure* |
350 bar [5075 psi] |
Rated flow at 7 bar |
20.5 l/min |
[100 psi] |
[5.4 US gal/min] |
Weight |
0.06 kg [0.13 lb] |
Pilot ratio |
3.2:1 |
Cavity |
NCS04/3 |
*Rated Pressure based on NFPA fatigue test standard (at 1 million cycles)
Note: A piston seal requires a 5 bar [72.5 psi] or greater return spring.
DIMENSIONS |
Cross-sectional view |
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mm [in] |
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22 mm |
42 |
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34-40 Nm |
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[25-30 lbf*ft] |
[1.65] |
M18 X 1.5 |
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<![if ! IE]> <![endif]>Ø 15 [Ø 0.59] |
<![if ! IE]> <![endif]>Ø 14 [Ø0.55] |
3 |
2 |
6 |
40.9 |
[0.24] |
[1.61] |
<![endif]>Ø 22 [Ø 0.87]
ORDERING |
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RPC04-2.5-OR-00-V |
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INFORMATION |
Pilot to Open |
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Seal Option |
Seal Kit |
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Omit = Buna-N |
230000160 |
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V = Viton |
230000450 |
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Crack Pressure |
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0.5 |
0.5 bar [7 psi] |
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2.5 |
2.5 bar [36.25 psi] |
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Code |
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Ports & Material |
Body Nomenclature |
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5 |
5 bar [72.5 psi] |
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00 |
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00 = Cartridge only |
No Housing |
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8 |
8 bar [116 psi] |
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SE1/4 |
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AL, 1/4 BSP |
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NCS04/3-SE-1/4 |
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15 |
15 bar [217.5 psi] |
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SE4S |
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AL, #4 SAE |
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NCS04/3-SE-4S |
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SE6S |
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AL, #6 SAE |
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NCS04/3-SE-6S |
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Pilot Seal Option |
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** Aluminum bodies are to be used for pressures less than 210 bar |
(3000 psi) |
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Omit |
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No seals |
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***Other housings available |
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OR |
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Seals |
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BC332375625108en-000101 • February 2020 |
PO - 6 |