Quick Reference Pilot to Open Model No. Description Flow* Pressure Page RPC NCS/3 Pilot Operated Check Valve, Pilot to Open.5 l/min [5. US gal/min] RPC NCS/3 35 l/min [9.3 US gal/min] CP5- SDC-3 3 l/min [ US gal/min] RPC NCS/3 9 l/min [3. US gal/min] 35 bar [575 psi] 35 bar [575 psi] bar [3 psi] 35 bar [57 psi] PO - 7 PO - PO - 9 PO - Quick Reference Pilot to Open Model No. Description Flow* Pressure Page CP5- SDC-3 Pilot Operated Check l/min bar PO - MC-RO SDC-3S Valve, Reverse Pilot to Open [5 US gal/min] 5 l/min [3 psi] 5 bar PO - [ US gal/min] [3 psi] CP5- CP-3S 95 l/min bar PO - 3 [5 US gal/min] [3 psi] CP5- SDC-3S 3 l/min bar PO - [3 US gal/min] [3 psi] CP53- CP-3S 3 l/min bar PO - 5 [ US gal/min] [3 psi] Pilot to Open Model No. Description Flow* Pressure Page Drain RPV NCS/ Pilot Operated Check 3 l/min 35 bar PO - Valve, Pilot-to-open with [ US gal/min] [5 psi] drain * Flow ratings are based on a pressure drop of 7 bar [ psi] unless otherwise noted. They are for comparison purposes only. PO - 75 Rev CB March
Quick Reference Symbol Model No. Description Flow* Pressure Page CP53-5 SDC- Pilot Operated Check Valve, Reverse Pilot-toopen with vent 5 l/min [ US gal/min] 35 bar [575 psi] PO - 7 Pilot to Close Model No. Description Flow* Pressure Page CP- SDC-3 Pilot Operated Check 5 l/min bar PO - Valve, Pilot to Close [ US gal/min] [3 psi] CP- CP-3S 5 l/min bar PO - 9 [3 US gal/min] [3 psi] CP- SDC-3S 9 l/min bar PO - [5 US gal/min] [3 psi] Dual Pilot-Operated Checks Model No. Description Flow* Pressure Page CP- none Pilot Operated Check Valve, Catalog HIC l/min [. US gal/min] bar [3 psi] PO - Quick Reference * Flow ratings are based on a pressure drop of 7 bar [ psi] unless otherwise noted. They are for comparison purposes only. 75 Rev CB March PO - 3
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. Application Notes Counterbalance valves will satisfy all four of the above requirements. Pilot operated check valves PO - 75 Rev CB March
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 pressure 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 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 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. Application Notes 75 Rev CB March PO - 5
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 (Ab R) - Ar P = W + (Pc Ar) (Ar R) - Ab retracts cylinder extends W = Load Pc = Check valve crack pressure (typically.3-.5 bar [5-5 psi]; consult catalog sheets for details) Ab = Cylinder bore area Ar = Cylinder rod area R = Check valve pilot ratio (typically 3: or :; 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: Application Notes 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. 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 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. PO - 75 Rev CB March
Pilot to Open RPC This is a pilot-to-open check valve. mm 3- Nm [5-3 lbf*ft] psi 5 5 [.5] cst [ SUS] hyd.oil at 5 C [ F] bar 3- -3 5 5 5 3 l/min gal/min * Rated flow at 7 bar [ psi] Pilot ratio 3.: M X.5 35 bar [575 psi].5 l/min [5. US gal/min]. kg [.3 lb] NCS/3 *Rated Pressure based on NFPA fatigue test standard (at million cycles) Note: A piston seal requires a 5 bar [7.5 psi] or RPC Ø [Ø.55] Ø 5 [Ø.59] Ø [Ø.7] 3 [.].9 [.] Pilot to Open Crack Pressure.5.5 bar [7 psi].5 5 5 RPC-.5-OR--V.5 bar [3.5 psi] 5 bar [7.5 psi] bar [ psi] 5 bar [7.5 psi] Pilot Seal Option Omit OR No seals Seals Code SE/ Seal Option Seal Kit Omit = Buna-N 3 V = Viton Ports & Material = Cartridge only AL, / BSP 35 Body Nomenclature No Housing NCS/3-SE-/ SES AL, # SAE NCS/3-SE-S SES AL, # SAE NCS/3-SE-S ** Aluminum bodies are to be used for pressures less than bar (3 psi) ***Other housings available 75 Rev CB March PO - 7
Pilot to Open RPC This is a pilot-to-open check valve. RPC psi 5 5 cst [ SUS] hyd.oil at 5 C [ F] bar 5 5-3 3-3 5 l/min 3 9 3 gal/min 7 mm -5 Nm [3-37 lbf*ft] M X.5 9 [.93] [.] Ø [Ø.7] Ø 9 [Ø.75] * Rated flow at 7 bar [ psi] 35 bar [575 psi] 35 l/min Pilot ratio 3.: [9.5 US gal/min]. kg [. lb] NCS/3 * based on NFPA fatigue test standard (at million cycles) Note: A piston seal requires a 5 bar [7.5 psi] or Ø.5 [Ø.] 3.5 [.33].9 [.93] Pilot to Open Crack Pressure.5.5 bar [7 psi] bar [3 psi] 5 RPC-5-OR--V 5 bar [7.5 psi] bar [5 psi] Pilot Seal Option Omit No seals OR Seals Code SE3/ SE/ SES Seal Option Seal Kit Omit = Buna-N 37 V = Viton 3 Ports & Material = Cartridge only AL, 3/ BSP AL, / BSP AL, # SAE Body Nomenclature No Housing NCS/3-SE-3/ NCS/3-SE-/ NCS/3-SE-S SES AL, # SAE NCS/3-SE-S ** Aluminum bodies are to be used for pressures less than bar (3 psi) ***Other housings available PO - 75 Rev CB March
Pilot to Open CP5- This valve is a pilot-to-open check valve. psi 3 bar 5 SUS (33 cst) hyd. oil @ F (3 C) 7 5 7 5 free flow pilot open 9 L/min 3 Flow US gal/min...3.5. 7/- UNF-A bar [3 psi] Rated flow at 7 bar 3 l/min [ psi] [ US gal/min] Leakage drops/min @.9 kg [. lb] Pilot ratio 3.: SDC-3 Note: A piston seal requires a.5 bar [5 psi] or h. in t -7 N. m [3-35 lbf. ft] CP5-3 7.5 [.7] 7.9 [.3] CP5 --B-S-5 - Seals Seal kit B = Buna-N 57 V = Viton 57 Body and ports Body P/N = Cartridge No body S = Aluminum, # SAE CP-3-S S = Aluminum, # SAE CP-3-S SE3B = Aluminum, 3/ BSP SDC-3-SE-3B SEB = Aluminum, / BSP SDC-3-SE-B Piston seals = No seals S = Seals included Cracking Pressure bar [psi] 5 =. [5] 5 =7.9 [5] =3. [] 35 =. [35] 75 Rev CB March PO - 9
Pilot to Open RPC This is a pilot-to-open check valve. psi 5 5 cst [ SUS] hyd.oil at 5 C [ F] bar 3- -3 l/min Rated flow at 7 bar [ psi] 35 bar [57 psi] 9 l/min Pilot ratio.: [3. US gal/min]. kg [. lb] NCS/3 Note: A piston seal requires a 5 bar [7.5 psi] or RPC 3 mm 9- Nm [.-7 lbf*ft] [.] 3 gal/min M33 X Ø.7 [Ø.] Ø 7.7 [Ø.] Ø 37. [Ø.5] [.55] 3 5.5 [.5] 5.5 [.] Pilot to Open Crack Pressure.5.5 bar [7 psi].5.5 bar [3.psi] 5 5. bar [7.5 psi] bar [5 psi] Pilot Seal Option Omit No Seals OR Seals RPC-5-OR--V Seal Option Seal Kit Omit = Buna-N 33 V = Viton 33 Code Ports & Material Body Nomenclature SE/ = Cartridge only AL, / BSP = Cartridge only NCS/3-SE-/ SE3/ AL, 3/ BSP NCS/3-SE-3/ SES SES AL, # SAE AL, # SAE NCS/3-SE-S NCS/3-SE-S **Aluminum bodies are to be used for pressures less than bar (3 psi) ***Other housings available PO - 75 Rev CB March
Reverse Pilot to Open CP5- This valve is a pilot-to-open check valve. psi 3 bar 5 SUS (33 cst) hyd. oil @ F (3 C) 7 5 7 5 free flow 9 L/min US gal/min. 3/- UNF-A pilot open 3 Flow..3.5. bar [3 psi] Rated flow at 7 bar l/min [ psi] [5 US gal/min] Leakage drops/min @.7 kg [.5 lb] Pilot ratio.: SDC-3 Note: A piston seal requires a.5 bar [5 psi] or h.75 in t 7-3 N. m [-5 lbf. ft] CP5-3. [.]. [.5] Seals Seal kit B = Buna-N 5 V = Viton 53 Housing and ports Housing P/N = No Housing No Housing SEB = Al, / BSP SDC-3-SE-B SE3B = Al, 3/ BSP SDC-3-SE-3B S = Al, # SAE CP-3-S S = Al, # SAE CP-3-S Other housings available CP5 --B-S-5 - Piston seals = No seals S = Seals included Crack Pressure bar [psi] 5 =. [5] 75 Rev CB March PO -
Reverse Pilot to Open MC-RO This is a pilot-to-open check valve. MC-RO 7mm 5-5 N m [33-37 lbf ft] psi 3 bar 5 5 5 cst [ SUS] hyd.oil at 5 C [ F] bar 5 bar bar 3 5 3 9 3 Free Flow to Pilot override to l/min 5 US gal/min 7/- UNF-A 5 bar [3 psi] Rated flow at 7 bar 5 l/min [ psi] [ US gal/min] Leakage drops/min @. kg [. lb] Pilot ratio 3.: SDC-3S Note: A piston seal requires a.5 bar [5 psi] or Ø. [.3] [.3]. [.] 37. [.] P3 753 Crack Pressure = bar [5 psi] 5 = 5 bar [73 psi] = bar [5 psi] MC-RO-5-OR-A-B-S Housing and ports Housing P/N = No Housing No Housing SE3B = Al, 3/ BSP SDC-3S-SE-3B SEB = Al, / BSP SDC-3S-SE-B S = Al, # SAE SDC-3S-S/S S = Al, # SAE SDC-3S-S/S Piston seals Omit = No seal Other housings available OR = Seals included Seals Seal kit B = Buna-N V =Viton 359 3559 PO - 75 Rev CB March
Reverse Pilot to Open CP5- This valve is a pilot-to-open check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 7 5 7 5 free flow pilot open 9 L/min Flow US gal/min.. 3.7.3 5. -/- UN-A bar [3 psi] Rated flow at 7 bar 95 l/min [ psi] [5 US gal/min] Leakage drops/min @. kg [. lb] Pilot ratio 3: CP-3S Note: A piston seal requires a.5 bar [5 psi] or h.5 in t -75 N. m [5-55 lbf. ft] CP5-3 55.9 [.].7 [.5] Seals Seal kit B = Buna-N V = Viton 5 Housing and ports Housing P/N = No Housing No Housing B = Al, / BSP CP-3S-B/B B = Al, 3/ BSP CP-3S-B/B S = Al, # SAE CP-3S-S/S S = Al, # SAE CP-3S-S/S Other housings available CP5 --B-S -5 - Piston seals = No seals S = Seals included Crack Pressure bar [psi] 5 =. [5] 75 Rev CB March PO - 3
Reverse Pilot to Open CP5- This valve is a pilot-to-open check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 CP5-7 5 7 5 free flow 9 pilot open L/min Flow US gal/min.. 3.7.3 5. -5/- UN-A bar [3 psi] Rated flow at 7 bar 3 l/min [ psi] [3 US gal/min] Leakage drops/min @.9 kg [. lb] Pilot ratio 3: SDC-3S Note: A piston seal requires a.5 bar [5 psi] or h.5 in t -3 N. m [9- lbf. ft] 3 5. [.5].7 [.5] Seal Option Code Seal Material Seal kit B Buna 33 V Viton 3 Housings & Ports Housing P/N : Cartridge Only No Housing B: 3/ BSP, AL CP-3S-B/B B: BSP, AL CP-3S-B/B S: # SAE, AL CP-3S-S/S S: # SAE, AL CP-3S-S/S Other Housings available CP5- - B - S - 5 - Piston Seals Code No seals S Seals Included Crack Pressure Code bar [psi] 5. [5] PO - 75 Rev CB March
Reverse Pilot to Open CP53- This valve is a pilot-to-open check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 7 5 7 5 free flow 9 pilot open L/min 3 Flow US gal/min..3 3..5 5.7-5/- UN-A bar [3 psi] Rated flow at 7 bar 3 l/min [ psi] [ US gal/min] Leakage drops/min @. kg [. lb] Pilot ratio 3: CP-3S Note: A piston seal requires a.5 bar [5 psi] or h.75 in t 7-3 N. m [-7 lbf. ft] CP53-3 79.5 [3.3]. [.] CP53 --B-S -5 - Seals Seal kit B = Buna-N 3 V = Viton 3 Housing and ports Housing P/N = No Housing No Housing B = Al, BSP CP-3S-B/B B = Al, -/ BSP CP-3S-B/B S = Al, # SAE CP-3S-S/S S = Al, # SAE CP-3S-S/S Other housings available Piston seals = No seals S = Seals included Crack Pressure bar [psi] 5 =. [5] 75 Rev CB March PO - 5
Pilot to Open with Drain RPV This is a pilot-to-open check valve with an internal drain. Drain psi 5 bar mm ²/sec (cst) [ SUS] @ 5 C [ F] 5 RPV 7 mm -5 N m [3-37 lbf ft] 5 3- -3 5 5 3 l/min flow US gal/min M x.5 35 bar [5 psi] Rated flow at 7 bar 3 l/min [ psi] [ US gal/min].3 kg [.9 lb] Pilot ratio 3.: NCS/ Note: A piston seal requires a.5 bar [5 psi] or. [.39] 3 7. [.] RPV - 5 - OR - -V Seals V =Viton Omit = Buna-N Seal Kit Consult factory 3 Piston seals Housing and ports Housing P/N OR = Seals = No Housing No Housing Omit = No seals L3/ = AL, 3/ BSP NCS/-L-3/ L3/ = AL, 3/ BSP NCS/-L-/ LS = AL,# SAE NCS/-L-S LS = AL,# SAE NCS/-L-S Other housings available PO - 75 Rev CB March
Reverse Pilot to Open with Vent CP53-5 This is a pilot-to-open check valve with an external pilot connection. 33 cst [5 SUS] hyd.oil @ 3 C [ F] psi 5 7 5.75 in 7-3 N m [-7 lbf ft] Pilot Port SAE # bar 9 l/min US gal/min X 55 to to piloted open 5 75.5 9. 3. 5. 7. 5/- UN-A Rated flow at 7 bar [ psi] Leakage Pilot ratio : 35 bar [575 psi] 5 l/min [ US gal/min] drops/min @.3 kg [.7 lb] SDC- Note: A piston seal requires a.5 bar [5 psi] or CP53-5. [.5] 57. [.5] Seals Seal kit B = Buna-N V =Viton CP53-5-B-S--5 Housing and ports Housing P/N = No Housing No Housing B = AL, BSP CP--B B = AL, -/ BSP CP--B S = AL, # SAE CP--S S = AL, # SAE CP--S Other housings available Crack Pressure bar [psi] 5 =.3 5 =.9 Pilot ratio = : 75 Rev CB March PO - 7
Pilot to Close CP- This valve is a pilot-to-close check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 CP- 7 5 7 5 : free flow 9 L/min Flow US gal/min 5.3. 5.9.. 7/- UNF-A bar [3 psi] Rated flow at 7 bar l/min [ psi] [5. US gal/min] Leakage drops/min @. kg [. lb] Pilot ratio : SDC-3 Note: A piston seal requires a.5 bar [5 psi] or h. in t -7 N. m [3-35 lbf. ft] 3. [.] 7.9 [.3] Seals Seal kit B = Buna-N 9 V = Viton Housing and ports Housing P/N = No Housing No Housing SE3B = Al, 3/ BSP SDC-3-SE-3B SEB = Al, / BSP SDC-3-SE-B S = Al, # SAE CP-3-S S = Al, # SAE CP-3-S Other housings available CP --B-S --5 - Piston seals = No seals S = Seals included Crack Pressure bar [psi] 5 =. [5] Pilot ratio = : PO - 75 Rev CB March
Pilot to Close CP- This valve is a pilot-to-close check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 7 5 7 5 free flow 9 L/min Flow US gal/min.. 3.7.3 5. bar [3 psi] Rated flow at 7 bar l/min [ psi] [ US gal/min] Leakage drops/min @. kg [.7 lb] Pilot ratio.3: CP-3S Note: A piston seal requires a.5 bar [5 psi] or -/- UN-A h.5 in t -75 N. m [5-55 lbf. ft] CP- 3 55.9 [.].7 [.5] Seals Seal kit B = Buna-N 335 V = Viton 33 Housing and ports Housing P/N = No Housing No Housing B = Al, / BSP CP-3S-B/B B = Al, 3/ BSP CP-3S-B/B S = Al, # SAE CP-3S-S/S S = Al, # SAE CP-3S-S/S Other housings available CP --B-S -5 - Piston seals = No seals S = Seals included Crack Pressure bar [psi]] 5 =. [5] 75 Rev CB March PO - 9
Pilot to Close CP- This valve is a pilot-to-close check valve. psi bar 5 SUS (33 cst) hyd. oil @ F (3 C) 3 CP- 7 5 7 5 free flow 9 L/min 3 Flow US gal/min..3 3..5 5.7-5/- UN-A bar [3 psi] Rated flow at 7 bar 9 l/min [ psi] [5 US gal/min] Leakage drops/min @.9 kg [. lb] Pilot ratio.3: SDC-3S Note: A piston seal requires a.5 bar [5 psi] or h.5 in t -3 N. m [9- lbf. ft] 3 5. [.5].7 [.5] Seal Option Code Seal Material Seal kit B Buna 33 V Viton 3 Housings & Ports Housing P/N : Cartridge Only No Housing B: 3/ BSP, AL CP-3S-B/B B: BSP, AL CP-3S-B/B S: # SAE, AL CP-3S-S/S S: # SAE, AL CP-3S-S/S Other Housings available CP- - B - S - 5 - Piston Seals Code No seals S Seals Included Crack Pressure Code bar [psi] 5. [5] PO - 75 Rev CB March
Catalog HIC CP- This is a dual pilot operated check valve, which uses two CV-NP check valves. psi 5 5 bar 3.5 [.5] 9. 3. [.75] [.5] cst [ SUS] hyd.oil at 5 C [ F] - 5 3 5 75 9 l/min US gal/min C 57. 95.3 [.5] [3.75] 3.5 [5.3]. [.3].3 [.5] 7. [3.] bar [3 psi] Rated flow at 7 bar l/min [ psi] [. US gal/min] Leakage drops/min @.7 kg [. lb] Pilot ratio : none Note: A piston seal requires a.5 bar [5 psi] or 5.9 [.3] 3. [.5] 3. [.5] V CP- C V 7.9 [.3] 7. [.] CP --B-S--5 Seals Seal kit W/ piston seals B = Buna-N 7 7 V = Viton 77 Housing and ports Housing P/N S = Aluminum, # SAE 99 S = Aluminum, # SAE 3B = Al, 3/ BSP 79 B = Al, / BSP 5 Crack Pressure bar [psi] 5 =.5 [5] Piston seals = No seals S = Seals included 75 Rev CB March PO -
Notes Notes PO - 75 Rev CB March