Quick reference Pilot to Open Model No. Description Flow* Pressure Page P RPC 4 NCS4/ Pilot Operated Check Valve, Pilot to Open l/min [ US gal/min] RPC 6 NCS6/ 5 l/min [7 US gal/min] CP45- SDC- l/min RPC NCS/ 7 l/min [8 US gal/min] [48 psi] [8 US gal/min] [45 psi] bar 8.6 [ psi] 5 bar 8.7 [45 psi] 4 bar 8.8 5 bar 8.9 Pilot to Open Model No. Description Flow* Pressure Page CP458- SDC8- Pilot Operated Check Valve, l/min bar 8. Reverse Pilot to Open [5 US gal/min] [ psi] MC-RO SDC-S 45 l/min 5 bar 8. [ US gal/min] [6 psi] CP45- CP-S 95 l/min bar 8. [5 US gal/min] [ psi] CP45- SDC6-S l/min bar 8. [4 US gal/min] [ psi] CP45- CP-S l/min bar 8.4 [6 US gal/min] [ psi] Pilot to Open Model No. Description Flow* Pressure Page Drain RPV 6 NCS6/4 Pilot Operated Check Valve, l/min 5 bar 8.5 Pilot-to-open with drain [8 US gal/min] [45 psi] Quick reference P 5 * Flow ratings are based on a drop of 7 bar [ psi] unless otherwise noted. They are for comparison purposes only. 5L588 Rev DA June 8.
Quick reference Symbol Model No. Description Flow* Pressure Page CP45-5 SDC- Pilot Operated Check Valve, 5 l/min 5 bar 8.6 Reverse Pilot-to-open with [66 US gal/min] [5 psi] vent P 59 Pilot to Close Model No. Description Flow* Pressure Page CP46- SDC- Pilot Operated Check Valve, 45 l/min bar 8.7 Pilot to Close [ US gal/min] [ psi] CP46- CP-S 5 l/min bar 8.8 [ US gal/min] [ psi] P CP46- SDC6-S 9 l/min [5 US gal/min] [ psi] bar 8.9 Quick reference Dual Pilot-Operated Checks Model No. Description Flow* Pressure Page CP4- none Pilot Operated Check Valve, 85 l/min bar 8. Catalog HIC [ US gal/min] [ psi] P 8E * Flow ratings are based on a drop of 7 bar [ psi] unless otherwise noted. They are for comparison purposes only. 8. 5L588 Rev DA June
Application notes MOTION CONTROL VALVES Motion control valves, also referred to as load holding valves, are used to control the motion of a load in the following ways: Prevent a load from dropping in case of hose or tube failure. Prevent a load from drifting caused by directional control valve spool leakage. Provide smooth, modulated motion when the load is in a lowering or run-away mode. Provide smooth, modulated motion when the directional control valve is suddenly closed. There are two basic types of motion control valves: Pilot-operated, or pilot-to-open check valves will satisfy the first two of the above requirements. Counterbalance valves will satisfy all four of the above requirements. Application notes F 9 5L588 Rev DA June 8.
Application notes PILOT-OPERATED CHECK VALVES Pilot-operated, or pilot-to-open check valves will positively hold a pressurized load and will release the load upon application of a signal to the pilot port. Pilot-operated check valves are available as individual cartridges, standard Cartridge-In-Body (CIB) packages, or can be created in custom manifolds by using a standard check valve such as CV-NP with a guided pilot piston. For more information on pilot pistons, see Accessories. Cartridge in body Individual cartridges P 7 Application notes P 7 A typical circuit application for pilotoperated check valves contains a pump, Typical circuit application W W directional control valve, and an actuator. Without a pilot-operated check valve the load will drift down due to spool leakage if the directional control valve is centered with the load raised. Additionally there is no protection against the load dropping in the event of hydraulic line failure. Adding a pilot-operated check valve helps prevent cylinder drift and provides protection against hose or tube failure. In this circuit, moving the directional control valve to the right causes the cylinder to extend. When the directional control valve is centered, the pilot-operated check valve will prevent leakage and lock the cylinder in position. Moving the directional control valve to the right sends /flow to the rod end of the cylinder. This also acts on the pilot piston to open the check valve and allow the load to be lowered. P 7 8.4 5L588 Rev DA June
Application notes PILOT-OPERATED CHECK VALVES (continued) The required to pilot open the check valve can be calculated by: P = W + (Pc Ab) cylinder (Ab R) - Ar P = W + (Pc Ar) (Ar R) - Ab retracts cylinder extends W = Load Pc = Check valve crack (typically.4-4.5 bar [5-65 psi]; consult catalog sheets for details) Ab = Cylinder bore area Ar = Cylinder rod area R = Check valve pilot ratio (typically : or 4:; consult catalog sheets for details) Note that these equations are idealized and do not consider any back in the circuit, which is additive to the 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 pilotoperated check valve to control an overrunning load can result in severely unstable motion. For motion (speed) control of overrunning loads, use a counterbalance valve. Closed center, directional control valves Use caution when applying pilotoperated Do Do not check valves to the rod end of a cylinder. Cylinders with large rod:bore diameter ratios may intensify rod to a point where the required pilot may be dangerously high refer to the above equations. If intensification creates application concerns, consider using a P 7 counterbalance valve. Application notes 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. 5L588 Rev DA June 8.5
Pilot to Open RPC 4 This is a pilot-to-open check valve. psi 5 5 5 bar 5 5 l/min drop 6 cst [5 SUS] hyd.oil @ C [68 F] 5 5 4 US gal/min flow P 679E Rated bar [ psi] Rated flow at 7 bar l/min [ US gal/min] [ psi].6 kg [. lb] Pilot ratio.: NCS4/ P 8E RPC 4 mm 4-4 N m [5- lbf ft] M8x.5 6. [.4] 4. [.65] P 65 Pressure to open.5 =.5 bar [7 psi].5 =.5 bar [ 6 psi] 5. = 5 bar [7 psi] RPC 4 -.5 - OR - - V V =Viton Omit = Buna-N 45 6 OR = Seal Omit = No seal = No Housing No Housing SE/4 = AL, /4 BSP NCS4/-SE-/4 SE4S = AL, #4 SAE NCS4/-SE-4S SE6S = AL, #6 SAE NCS4/-SE-6S P 76E 8.6 5L588 Rev DA June
Pilot to Open RPC 6 This is a pilot-to-open check valve. psi 5 5 5 bar 5 5 l/min drop 6 cst [5 SUS] hyd.oil @ C [68 F] 4 US gal/min 4 6 8 flow P 68E Rated 5 bar [45 psi] Rated flow at 7 bar 5 l/min [7 US gal/min] [ psi]. kg [. lb] Pilot ratio.4: NCS6/ P 8E 7 mm 44-5 N m [-7 lbf ft] Mx.5 RPC 6. [.9] 49. [.9] P 65 Pressure to open.5 =.5 bar [7 psi] 5 = 5 bar [7 psi] OR = Omit = No seals RPC 6-5 - OR - - V V =Viton Omit = Buna-N 7 = No Housing No Housing SE/8 = AL, /8 BSP NCS6/-SE-/8 SE/4 = AL, /4 BSP NCS6/-SE-/ SE6S = AL, #6 SAE NCS6/-SE-6S SE8S = AL, #8 SAE NCS6/-SE-8S P 77E 5L588 Rev DA June 8.7
Pilot to Open CP45- This valve is a pilot-to-open check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 8E CP45-74 45 6 87 58 Pressure drop 8 6 free flow 4 pilot open 9 L/min 8 6 4 4 Flow US gal/min. 4. 6. 8.5.6 P 8E 7/8-4 UNF-A Rated Rated flow at 7 bar [ psi] h. in t 4-47 N. m [-5 lbf. ft] 4 bar [48 psi] l/min [8 US gal/min] 6 drops/min @ Rated Pilot ratio.:.9 kg [. lb] SDC- 47.5 [.87] 7.9 [.] P 6E CP45 --B-8S-5 - B = Buna-N 57 V = Viton 57 Body and ports Body P/N = Cartridge No body 6S = Aluminum, #6 SAE CP--6S 8S = Aluminum, #8 SAE CP--8S SEB = Aluminum, /8 BSP SDC--SE-B SE4B = Aluminum, / BSP SDC--SE-4B P 67E = No seals S = included Cracking Pressure bar [psi] 65 = 4.48 [65] 5 = 7.9 [5] =.8 [] 5 =.8 [5] 8.8 5L588 Rev DA June
Pilot to Open RPC This is a pilot-to-open check valve. psi 5 bar drop 6 cst [5 SUS] hyd.oil @ C [68 F] P 8E 5 5 5 5 l/min 4 6 8 US gal/min 4 8 6 flow P 68E Rated 5 bar [45 psi] Rated flow at 7 bar 7 l/min [8 US gal/min] [ psi]. kg [.44 lb] Pilot ratio.8: NCS/ 8 mm 44-5 N m [64-7 lbf ft] Mx RPC 8. [.7] 66. [.6] P 654 Pressure to open.5 =.5 bar [7 psi] 5 = 5 bar [7 psi] OR = Omit = No seals RPC - 5 - OR - - V V =Viton Omit = Buna-N 6 = No Housing No Housing SE/ =AL, / BSP NCS/-SE-/ SE/4 =AL, /4 BSP NCS/-SE-/4 SE8S = AL, #8 SAE NCS/-SE-8S SES = AL, # SAE NCS/-SE-S P 78E 5L588 Rev DA June 8.9
Pilot to Open CP458- This valve is a pilot-to-open check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 77E CP458-74 45 6 87 58 Pressure drop 8 6 4 free flow 9 L/min 8 US gal/min. /4-6 UNF-A pilot open 6 4 4 Flow 4. 6. 8.5.6 P 4E Rated Rated flow at 7 bar [ psi] h.875 in t 7-4 N. m [-5 lbf. ft] bar [ psi] l/min [5 US gal/min] 6 drops/min @ Rated Pilot ratio.8:.7 kg [.5 lb] SDC8-4.6 [.6] 6.4 [.5] P 4E CP458 --B-6S-65 - B = Buna-N 5 V = Viton 5 = No Housing No Housing SEB = Al, /4 BSP SDC8--SE-B SEB = Al, /8 BSP SDC8--SE-B 4S = Al, #4 SAE CP8--4S 6S = Al, #6 SAE CP8--6S = No seals S = included Crack Pressure bar [psi] 65 = 4.48 [65] P 76E 8. 5L588 Rev DA June
Pilot to Open MC-RO This is a pilot-to-open check valve. psi bar 6 cst [ SUS] hyd.oil at 5 C [ F] P 77E 5 5 5 bar 5 bar bar Free Flow to Pilot override to 4 5 6 l/min 6 9 5 US gal/min P77E Rated 5 bar [6 psi] Rated flow at 7 bar 45 l/min [ US gal/min] [ psi] 6 drops/min @. kg [.6 lb] Pilot ratio.: SDC-S 7mm 45-5 N m [-7 lbf ft] 7/8-4 UNF-A Ø. [.8] MC-RO 8 [.].6 [.6] 7.4 [.46] P 75 Crack Pressure = bar [5 psi] 5 = 5 bar [7 psi] = bar [45 psi] MC-RO-5-OR-A-B-6S = No Housing No Housing SEB = Al, /8 BSP SDC-S-SE-B SE4B = Al, / BSP SDC-S-SE-4B 6S = Al, #6 SAE SDC-S-6S/6S 8S = Al, #8 SAE SDC-S-8S/6S Omit = No seal OR = included B = Buna-N V =Viton 5449 5459 P 77E 5L588 Rev DA June 8.
Pilot to Open CP45- This valve is a pilot-to-open check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 77E CP45-74 45 6 87 58 Pressure drop 8 6 free flow 4 pilot open 9 L/min 4 8 6 Flow US gal/min.6..7 4. 5.8 P 67E -/6- UN-A Rated Rated flow at 7 bar [ psi] Pilot ratio : h.5 in t 68-75 N. m [5-55 lbf. ft] bar [ psi] 95 l/min [5 US gal/min] 6 drops/min @ Rated. kg [.46 lb] CP-S 55.9 [.].7 [.5] P 54E B = Buna-N 4 V = Viton 5 = No Housing No Housing 4B = Al, / BSP CP-S-4B/B 6B = Al, /4 BSP CP-S-6B/B S = Al, # SAE CP-S-S/4S S = Al, # SAE CP-S-S/4S CP45 --B-S -65 - = No seals S = included Crack Pressure bar [psi] 65 = 4.48 [65] P 6E 8. 5L588 Rev DA June
Pilot to Open CP45- This valve is a pilot-to-open check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 77E 74 45 6 87 58 Pressure drop 8 free flow 6 4 9 pilot open L/min 4 8 6 Flow US gal/min.6..7 4. 5.8 P 65E -5/6- UN-A Rated Rated flow at 7 bar [ psi] Pilot ratio : h.5 in t -6 N. m [9- lbf. ft] bar [ psi] l/min [4 US gal/min] 6 drops/min @ Rated.9 kg [.64 lb] SDC6-S CP45-54.6 [.5].7 [.5] P 5E B = Buna-N V = Viton 4 = No Housing No Housing 6B = Al, /4 BSP CP6-S-6B/B 8B = Al, BSP CP6-S-8B/B S = Al, # SAE CP6-S-S/4S 6S = Al, #6 SAE CP6-S-S/4S CP45 --B-6S -65 - = No seals S = included Crack Pressure bar [psi] 65 = 4.48 [65] P 8E 5L588 Rev DA June 8.
Pilot to Open CP45- This valve is a pilot-to-open check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 77E CP45-74 45 6 87 58 Pressure drop 8 6 free flow 4 9 pilot open L/min 8 6 4 4 Flow US gal/min. 4. 6.4 84.5 5.7 P 6E -5/8- UN-A Rated Rated flow at 7 bar [ psi] Pilot ratio : h.875 in t 7- N. m [6-7 lbf. ft] bar [ psi] l/min [6 US gal/min] 6 drops/min @ Rated.66 kg [.46 lb] CP-S 79.5 [.] 6.8 [.66] P 5E B = Buna-N 8 V = Viton 8 = No Housing No Housing 8B = Al, BSP CP-S-8B/B B = Al, -/4 BSP CP-S-B/B 6S = Al, #6 SAE CP-S-6S/4S S = Al, # SAE CP-S-S/4S CP45 --B-S -65 - = No seals S = included Crack Pressure bar [psi] 65 = 4.48 [65] P 86E 8.4 5L588 Rev DA June
Pilot to Open with Drain RPV 6 This is a pilot-to-open check valve with an internal drain. Drain psi 5 bar 5 6 mm ²/sec (cst) [4 SUS] @ 5 C [ F] P 5 7 mm 44-5 N m [-7 lbf ft] 5 5 5 4 l/min 4 4 6 8 flow US gal/min M x.5 4 P 8E Rated 5 bar [45 psi] Rated flow at bar l/min [8 US gal/min] [ psi]. kg [.9 lb] Pilot ratio.4: NCS6/4 RPV 6. [.9] 4 67. [.64] P 79 RPV 6-5 - OR - -V V =Viton Omit = Buna-N Seal Kit Consult factory 8 OR = = No Housing No Housing Omit = No seals L/8 = AL, /8 BSP NCS6/4-L-/8 L/4 = AL, /4 BSP NCS6/4-L-/ L6S = AL, #6 SAE NCS6/4-L-6S L8S = AL, #8 SAE NCS6/4-L-8S P 8E 5L588 Rev DA June 8.5
Pilot to Open with Drain CP45-5 This is a pilot-to-open check valve with an external pilot connection. cst [54 SUS] hyd.oil @ 8 C [ F] psi bar 45 P 59 CP45-5.875 in 7- N m [6-7 lbf ft] Pilot Port SAE #4 X 6 8 to 87 6 58 4 9 topiloted open l/min 55 65 75 US gal/min 4.5 9. 4.6 58. 7.6 P766E 5/8- UN-A Rated 5 bar [5 psi] Rated flow at 7 bar 5 l/min [66 US gal/min] [ psi] 6 drops/min @ Rated. kg [.7 lb] Pilot ratio 4: SDC- 64. [.5] 57. [.5] P 75 B = Buna-N V =Viton CP45-5-B-6S-4-65 = No Housing No Housing 8B = AL, BSP CP--8B B = AL, -/4 BSP CP--B 6S = AL, #6 SAE CP--6S S = AL, # SAE CP--S Crack Pressure bar [psi] 65 = = 4. 6.9 65 Pilot ratio 4 = 4: P 767E 8.6 5L588 Rev DA June
Pilot to Close CP46- This valve is a pilot-to-close check valve. psi bar 54 SUS ( cst) hyd. oil @ F (8 C) 4 P 78E 74 45 6 87 58 Pressure drop : 8 6 4 free flow 9 L/min 4 6 8 Flow US gal/min 5..6 5.9. 6.4 P 7E 7/8-4 UNF-A Rated Rated flow at 7 bar [ psi] Pilot ratio : h. in t 4-47 N. m [-5 lbf. ft] bar [ psi] l/min [5.8 US gal/min] 6 drops/min @ Rated. kg [. lb] SDC- CP46-46. [.8] 7.9 [.] P 56E B = Buna-N 9 V = Viton = No Housing No Housing SEB = Al, /8 BSP SDC--SE-B SE4B = Al, / BSP SDC--SE-4B 6S = Al, #6 SAE CP--6S 8S = Al, #8 SAE CP--8S CP46 --B-8S--65 - = No seals S = included Crack Pressure bar [psi] 65 =4.48 [65] Pilot ratio = : P 7E 5L588 Rev DA June 8.7
Pilot to Close CP46- This valve is a pilot-to-close check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 78E CP46-74 45 6 87 58 9 Pressure drop 8 6 4 L/min US gal/min 4.6 free flow 8 6 Flow..7 4. 5.8 P 66E -/6- UN-A Rated Rated flow at 7 bar [ psi] h.5 in t 68-75 N. m [5-55 lbf. ft] bar [ psi] 6 l/min [6 US gal/min] 6 drops/min @ Rated Pilot ratio.:. kg [.47 lb] CP-S 55.9 [.].7 [.5] P 5E B = Buna-N 5 V = Viton 6 = No Housing No Housing 4B = Al, / BSP CP-S-4B/B 6B = Al, /4 BSP CP-S-6B/B S = Al, # SAE CP-S-S/4S S = Al, # SAE CP-S-S/4S CP46 --B-S -65 - = No seals S = included Crack Pressure bar [psi]] 65 = 4.48 [65] P 77E 8.8 5L588 Rev DA June
Pilot to Close CP46- This valve is a pilot-to-close check valve. psi bar 4 54 SUS ( cst) hyd. oil @ F (8 C) P 78E 74 45 6 87 58 Pressure drop 8 6 4 9 free flow L/min 8 6 4 4 Flow US gal/min. 4. 6.4 84.5 5.7 P 64E -5/6- UN-A Rated Rated flow at 7 bar [ psi] h.5 in t -6 N. m [9- lbf. ft] bar [ psi] 9 l/min [5 US gal/min] 6 drops/min @ Rated Pilot ratio.:.9 kg [.64 lb] SDC6-S CP46-54.6 [.5].7 [.5] P 5E B = Buna-N V = Viton 4 CP46 --B-6S -65 - = No seals S = included = No Housing No Housing 6B = Al, /4 BSP CP6-S-6B/B 8B = Al, BSP CP6-S-8B/B S = Al, # SAE CP6-S-S/4S 6S = Al, #6 SAE CP6-S-S/4S Crack Pressure bar [psi] 65 = 4.48 [65] P 8E 5L588 Rev DA June 8.9
Dual Pilot-Operated Checks CP4- This is a dual pilot operated check valve, which uses two CV-NP check valves. CP4- psi 45 6 87 58 9 Pressure drop 9. [.75] bar 8 6 4 L/min US gal/min 54 SUS ( cst) hyd. oil @ F (8 C) 5. 6.5 [.5].8 [.5] C V 4 6 8 Flow.6 5.9. 6.4 P E C 57. 95. [.5] [.75] 9. [5.9] 8.6 [.4] 4. [4.5] 76. [.] Rated 5.9 [.6] Rated flow at 7 bar [ psi] Pilot ratio 4: 8. [.5].8 [.5] V bar [ psi] 85 l/min [ US gal/min] 6 drops/min @ Rated.67 kg [.48 lb] none P 8E C V 7.9 [.] 47.8 [.88] CP4 --B-8S--65 P 46E W/ piston seals B = Buna-N 7 76 V = Viton 6 77 6S = Aluminum, #6 SAE 99 8S = Aluminum, #8 SAE B = Al, /8 BSP 794 4B = Al, / BSP 65 Crack Pressure bar [psi] 65 = 4.5 [65] = No seals S = included P 88E 8. 5L588 Rev DA June