Check-Q-Meter Model FD, (Series 2X) for Mounting on SAE Flanged Cylinder, Cartridge Units, and Subplate Mounting GPM (560 L/min) K2791/2

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1 Size 12, 16, 2, 32 Check-Q-eter odel FD, (Series 2) for ounting on SE Flanged Cylinder, Cartridge Units, and Subplate ounting GP (60 L/min) PSI (30 bar) R 2 1/09.9 R 2 1/09.9 Replaces: 0.94 Leak-free pilot operated check function Tamper-proof, pressure setting for opening Flange mounts directly to SE interface on cylinder Subplate version available, for manifold or panel mounting Optional port relief on flange mounted version ounts on standard ISO 81-06, 08 or 10, NFP/NSI P 06, P 08 or P10 For subplates, see R Cartridge version available for installation in manifolds Functions: Pilot operated check valve (leak free), The counterbalance & lock valve meters the flow exiting an actuator dependent upon the input flow with differential cylinders, the area ratio must be considered to prevent intensification. y-pass valve, for reverse free-flow. Optional port relief valve (flanged version, odel F, only). K291/2 odel FD..F..2/... with SE flanged ports with and without port relief valve Ordering code Subplate mounting (P) Subplates NFP/NSI available interface Ordering SE, NPT, G (SP) standard code 3/8" and 1/2" P and 16 3/4" and 1" P /4" and 1-1/2" P Flange mounted (F) 3/4" 6000 PSI (41 bar) flange 12 and 16 1" SE 6000 PSI (41 bar) flange 2 1-1/4" SE 6000 PSI (41 bar) flange 32 Cartridge assembly, for manifold installation Subplate mounting without port relief SE flange connections without port relief SE flange connections with port relief Series 20 to 29 (20 to 29: externally interchangeable) FD 2 * = K = P = F = F = 2 Further details to be written in clear text Threads for Port and no code = G (SP) threads 12 = SE threads no code = NR seals, suitable for petroleum oils (H, HL, HLP) V = phosphate ester fluids (HFD-R) 00 = Without orifice 03 = Orifice Ø 0.012" (0.30 mm) (Sizes 12 and 16) 04 = Orifice Ø 0.016" (0.40 mm) (Size 2) 06 = Orifice Ø 0.024" (0.60 mm) (Size 32) (Other orifice diameters available on request) aximum pressure setting of relief valve (only flange mounted version, odel F) 200 = dj. pressure PSI (200 bar) Size 2 & 32 only 300 = dj. pressure PSI (300 bar) Size 2 & 32 only 400 = dj. pressure PSI (400 bar) ll sizes Symbols Without port relief valve With port relief valve Valve model: FD 12 K 2/03.. FD 16 K 2/03.. FD 2 K 2/04.. FD 32 K 2/06.. Valve model: FD 12 P 2/03.. FD 12 F 2/03.. FD 16 P 2/03.. FD 16 F 2/03.. FD 2 P 2/04.. FD 2 F 2/04.. FD 32 P 2/06.. FD 32 F 2/06.. Valve model: FD 12 F 2/.03.. FD 16 F 2/.03.. FD 2 F 2/.04.. FD 32 F 2/.06.. T 1/8

2 R 2 1/09.9 Functional description Check-Q-eters are used in hydraulic systems to control speeds of hydraulic motors and cylinders independent of load, (prevent runaway). dditionally, an isolation function is possible if plumbing failures occur. The Check-Q-eter is comprised of housing (1), main poppet (2), pilot piston (3), pilot spool (4), dampening spool (), and pilot dampening orifice (6). Lifting the load The valve opens in a free-flow direction from port to port. ain poppet (2) opens at a cracking pressure of 30 PSI (2 bar), and load induced pressure at port () is available to chamber (8). This permits closure of main poppet (2) should a plumbing failure occur between the Check-Q-eter and the directional control. Lowering the load (circuit example, next page) The direction of flow is from to. Port is connected to tank via directional valve. The rod side of the cylinder has a force applied which corresponds to working conditions. The relationship between the control pressure at port and load pressure at port = 1:20. When control pressure is achieved, pre-opening of the main spool takes place. Via control spool (4), pilot stage (3) lifts and decompresses chamber (8) via radial drillings and port to tank. t the same time, load pressure in port is no longer applied to chamber (8), due to the longitudinal movement of pilot stage (3) within the main spool. ain poppet (2) remains decompressed. The annulus area of control spool (4) remains positioned against the collar of dampening spool (). The pressure required at port to open to is controlled by the spring in chamber (9). The pressure required to begin opening to is 290 PSI (20 bar); to fully open 2 PSI (0 bar) is required. The opening cross-section for flow control increases progressively. It is created by the successive opening of radial drillings on the sleeve and main poppet (2). The relationship between control pressure, cracking pressure, and differential pressure determines flow to the actuator via to. Thus, uncontrolled movement of actuators is prevented. The controlled lowering procedure is not affected even if there is a plumbing failure between the directional valve and port. Guidelines for opening & closing times of the Check-Q-eter Throttling of the opening sequence is via orifice (6) in control spool (4) and both sides of dampening spool (). The closing movement of the Check-Q-eter is virtually unthrottled. When being applied in conjunction with cylinders, a throttle/ check valve (meter out control) can be installed in port to influence closing speed. When being applied in conjunction with motors, a throttle check valve should not be installed in the control line to port. In this case, it is recommended that the response times of the directional valve are controlled. rr T /8

3 Circuit examples Single rod cylinders For safety, blocked ports on the directional valve (ports & ) should be considered. Hydraulic motors R 2 1/09.9 Due to the internal leakage of hydraulic motors, positive load holding can not be assured by leak-free closure of the counterbalance and lock valve. For positive load holding, it is recommended to use a spring applied, hydraulically released mechanical brake, as below. If the brake is externally piloted, it is possible to use a blocked port directional control valve. P T Note: Two cylinders operating in parallel, and not mechanically tied together, cannot be controlled by two individual Check-Q-eters, (there is no way to guarantee cylinder synchronization). solution may be to apply two externally drained pilot operated check valves (Rexroth odel SL) to prevent cross flow between the cylinders during load holding, and one Check-Q-eter as illustrated. In this case, load induced pressure should not exceed 2900 PSI (200 bar). Y 3/8

4 R 2 1/09.9 Technical data (For applications outside these parameters, please consult us!) Operating pressure Port, PSI (bar) (30) Port PSI (bar) (420) Pilot pressure, port (flow control range) PSI (bar) 290 (20)... 2 (0), maximum 4600 (31) Cracking pressure, to PSI (bar) 29 (2) djustment range of port relief valve PSI (bar) (400) Flow GP (L/min) Size 12 Size 16 Size 2 Size (80) 2.8 (200) 84. (320) 14.9 (60) rea ratio of the pilot operation ball seat area 1 = opening piston area 20 Hydraulic fluid Petroleum oils to (H, HL, HLP), Phosphate ester fluids (HFD-R) Fluid temperature range F ( C) NR seals; ( ) FP seals; ( ) Viscosity range SUS (mm 2 /s) ( ) aximum degree of fluid contamination Class 18/1 according to ISO Therefore, we recommend a filter with a retention rate of β 10. Operating curves, measured at ν = 190 SUS (41 mm 2 ) and t = 122 F (0 C) p Pressure drop p PSI (bar) (40) (3) (30) (2) (20) (1) (10) ( ) Size 12 Size 16 Size 2 Size 32 Pressure drop p related to flow Q measured at throttle position: throttle fully open p x = 2 PSI (0 bar) Q (80) (160) (240) (320) (400) (480) (60) Flow Q GP (L/min) p Pressure drop p PSI (bar) (12) 160 (10) (8) 120 (6) 80 (4) 40 (2) 0 Size 12 Size 16 Size 2 Size Q Pressure drop p related to flow Q measured via the check valve (80) (160) (240) (320) (400) (480) 60 Flow Q GP (L/min) 4/8

5 R 2 1/09.9 1/10.91 Unit dimensions, Cartridge Unit for anifold ounting, odel "K : dimensions in inches (millimeters) 2 Ø (2)/0.039 (1) deep 1 2 SE-4; /16-20 (G (SP) 1/4") Ø D ( +0.2 ) Ø D ( +0.1 ) D3 y y L ( +0.1 ) L ( +0.4 ) L11 L12 Ø (0.0) L ( 0.3 ) 30 2 Ø D4 H8 Ø D ( +0.2 ) Ø D (2.)R x Ø D6 x x (2.)R 2 L Ø D8 L4 L ( 0.4 ) L±0.008 (±0.2) L6±0.008 (±0.2) L8 L9 x (R x 16) Ø D y (R x 8) D9; T1 Notes: 1) Port can be connected to port at any position. However care must be taken not to damage the valve mounting threads. 2) Tightening torque for the cartridge unit Size 12 & lb-ft (6 Nm) Size 2 81 lb-ft (110 Nm) Size lb-ft (20 Nm) 1±0.008 (±0.2) 1±0.008 (±0.2) 1 Pilot control port 2 Nameplate odel 1 ±0.008 ( ±0.2 ) 2 D ( +0.2 ) D ( +0.1 ) D3 D4 D D6 D ( +0.2 ) FD 12 K-2/ (48) 2.6 (0) (4) (46) 42x ( ) (34) (46) 1.20 (38.6) 0 0 FD 16 K-2/ (48) 2.6 (0) (4) (46) 42x ( ) (34) (46) 1.20 (38,6) 0 0 FD 2 K-2/ 2.20 (6) 3.1 (80) (60) (4) 2x ( ) 1. (40) (60) (48.6) 0 0 FD 32 K-2/ 2.98 (66) 3.4 (9) 2.83 (2) 2.9 (6) 64x ( ) 2.04 (2) (4) 2.30 (8.6) odel D8 D9 T1 L ( -0.3 ) L ( +0.4 ) L ( -0.4 ) L4 L ±0.008 ( ±0.2 ) L6 ±0.004 ( ±0.1 ) FD 12 K-2/ (16) 3/8"-16 (10) (16) 1.3 (39) 630 (16) (32) (1.) (0.6) (60) FD 16 K-2/ (16) 3/8"-16 (10) (16) 1.3 (39) 630 (16) (32) (1.) (0.6) (60) FD 2 K-2/ 0.48 (19) 1/2"-13 (12) 0.48 (19) (0) 0.48 (19) 1.3 (39) (22) 2.9 (6) 3.10 (80) FD 32 K-2/ (23) /8"-11 (16) (23) 2.04 (2) 0.48 (19) 1. (40) (2) 2.9 (1) (8) odel L L8 L9 L ( +0.1 ) L11 L12 FD 12 K-2/ (3) 3.01 (8).039 (128) (2.3).20 (191) 2.9 (6) FD 16 K-2/ (3) 3.01 (8).039 (128) (2.3).20 (191) 2.9 (6) FD 2 K-2/ 0.1 (4) (10).16 (182) (2.3) (23) 2.93 () FD 32 K-2/ 0.1 (4) (10).9 (198) (2.3) (289) 3.01 (94) odel Valve mounting bolts Torque lb-ft (Nm) Weight (approx.) lbs (kg) FD 12 K-2/ 4) 3/8"-16 x 2 3/4" (10 x 0 mm) 1 (69) 6.2 (2.8) FD 16 K-2/ 4) 3/8" 16 x 2 3/4" (10 x 0 mm) 1 (69) 6.2 (2.8 FD 2 K-2/ 4) 1/2"-13 x 3 1/4" (12 x 80 mm) 89 (120) 12.3 (.6) FD 32 K-2/ 4) /8"-11 x 4" (16 x 100 mm 218 (29) 16. (.) /8

6 R 2 1/09.9 Unit dimensions, SE Flange ounted, odel F, without Port Relief Valve: dimensions in inches (millimeters) L4 L Ø D; T () L1 L2 L3 Ø (2)/ 0.04 (1) deep SE-4; /16-20 (G 1/4") Ø D1; T1 Ø D2 Ø (2)/ 0.04 (1) deep SE-4; /16-20 (G 1/4") H1 1 H2 2 odel SE Flange D1 D2 D3 D4 D H1 H2 FD 12 F 2/ 3/4" /8" (0.8) (16.) (2) (110) (43) (18) (10.) (18) (10) (36) (2) FD 16 F 2/ 3/4" /8" (0.8) (16.) (2) (110) (43) (18) (10.) (18) (10) (36( (2) FD 2 F 2/ 1" /2" (.2) (14.) (90) (132) (0) (2) (13.) (2) (12) (4) (90) FD 32 F 2/ 1-1/4" /16" (66.) (20.0) (10) (14) (6) (30) (1.0) (30) (14) (0) (10) odel L1 L2 L3 L4 L L6 T1 T2 Weight (approx.) lbs (kg) O-Ring () FD 12 F 2/ (39) (23.8) (10) (6) (140) (8) (0.1) (1) () 2 mm x 3. mm FD 16 F 2/ (39) (23.8) (10) (6) (140) (8) (0.1) (1) () 2 mm x 3. mm FD 2 F 2/ (0) (2.8) (148) () (200) (10) (0.1) (18) (16) mm x 3.3 mm FD 32 F 2/ (2) (31.6) (1) (94) (21) (11) (0.1) (21) (21) 3. mm x 3.3 mm 6/8 L2 Ø D3 Ø D4 1 Notes: SE 6000 PSI (420 bar) flanges must be ordered separately for port, see R 4 20 Flange mounting bolts and blanking plate are included for mounting the valve directly to the cylinder 1 Pilot control port 3 Flange mounting bolts Optional port 2 Gauge connection 4 lanking plate 6 Nameplate O-ring L6

7 R 2 1/09.9 Unit dimensions, SE Flange ounted, odel F, with Port Relief Valve: dimensions in inches (millimeters) L L6 3 4 L Ø D; T3 () T L1 L2 L3 1 Ø (2)/ 0.04 (1) deep SE-4; /16-20 (G 1/4") Ø D1; T1 Ø D2 L4 2 Ø (2)/ 0.04 (1) deep SE-4; /16-20 (G 1/4") Ø D3; T2 D4 T 8 H1 H2 H3 1 L8 L2 Ø D Ø D6 Notes: SE 6000 PSI (20 bar) split flanges must be ordered separately for port, see R 4 20 Flange mounting bolts and blanking plate are included for mounting the valve directly to the cylinder 1 Pilot control port 2 Gauge connection 3 Flange mounting bolts 4 lanking plate Optional port 6 Nameplate O-ring 8 Port relief valve odel SE Flange D1 D2 D3 D4 D D6 D H1 H2 FD 12 F 2/' 3/4" SE-8;3/ /16" (0.8) (4) (16.) (2) (110) (43) (18) (34) (G (SP) 1/2") (10.) (18) (10) (36) (2) FD 16 F 2/ 3/4" SE-8;3/ /16" (0.8) (4) (16.) (2) (110) (43) (18) (34) (G (SP) 1/2") (10.) (18) (10) (36) (2) FD 2 F 2/ 1" SE-12; 1 1/ /2" (.2) (80) (14.) (90) (132) (0) (2) (42) (G (SP) 3/4") (13.) (2) (12) (4) (90) FD 32 F 2/ 1-1/4" SE-12; 1 1/ /16" (66.) (80) (20.0) (10) (14) (6) (30) (42) (G (SP) 3/4") (1.0) (30) (14) (0) (10) odel H3 L1 L2 L3 L4 L L6 L L8 T1 T2 T3 Weight (approx.) lbs (kg) O-ring () FD 12 F 2/ mm x (118) (39) (23.8) (10) (141.) (6) (162) (38) (8) (0.1) (1) (1) (9) 3. mm FD 16 F 2/ mm x (118) (39) (23.8) (10) (141.) (6) (162) (38) (8) (0.1) (1) (1) (9) 3. mm FD 2 F 2/ mm x (14) (0) (2.8) (148) (198) () (22) (0) (10) (0.1) (1) (18) (18) 3.3 mm FD 32 F 2/ mm x (14) (2) (31.6) (1) (21) (94) (240) (0) (11) (0.1) (1) (21) (24) 3.3 mm /8

8 R 2 1/09.9 Unit dimensions, Subplate ounted, odel P : dimensions in inches (millimeters) L 4 L8 L1 L6 3 Ø (2)/0.04 (1) deep SE-4; /16-20 (G 1/4") /4.0 in 0.01/100 mm (R max 4) Required surface finish of interface when mounting the valve without our subplate H1 H2 L1 L3 L4 Ø (6) Ø (11) 6 1 H3 L2 L Ø (2)/ 0.04 (1) deep 3 SE-4; /16-20 (G 1/4") 0.1 (4) 2 1 Pilot control port 2 Gauge connection 3 Locating pin 4 Not with size 12,16 and 2 4) ounting holes for size 12, 16 & 2. 6) ounting holes for size 32 6 Nameplate O-Ring 8 Porting pattern to ISO 81-06, 08, 10, NFP/NSI P 06, P 08, P 10 odel H1 H2 H3 L1 L2 FD 12 P 2/ (66.) (8) 2.6 (0) (8) 1.63 (42.) 2.6 (0) 1.2 (31.8) (.2) FD 16 P 2/ (66.) (8) 2.6 (0) (8) 1.63 (42.) 2.6 (0) 1.2 (31.8) (.2) FD 2 P 2/ (9.4) 3.93 (100) 3.1 (80) 3.93 (100) (0) 3.1 (80) 1.3 (38.9) 0.43 (11.1) FD 32 P 2/ (96.8) 4.24 (120) 3.4 (9) 4.24 (120) (60) 3.4 (9) 1.39 (3.3) 0.6 (16.) odel L3 L4 L L6 L L8 Weight (approx.) lbs (kg) O-ring () FD 12 P 2/ (3.8) (42.9) (3.2) 2.6 (6).1 (140) 19.8 (9) 21.3 mm x 2.4 mm FD 16 P 2/ (3.8) (42.9) (3.2) 2.6 (6).1 (140) 19.8 (9) 21.3 mm x 2.4 mm FD 2 P 2/ 1.93 (49.2) 2.34 (60.3) 4.29 (109.1) 2.9 ().8 (200) 39. (18) mm x 2.62 mm FD 32 P 2/ 1.6 (42.1) 2.6 (6.) 3.31 (84.2) 4.13 (119.) 3.0 (94) 8.46 (21) 2.9 (24) 38 mm x 3 mm Size *Subplates *Valve mounting bolts 12 & 16 G 460/0 (3/8" NPT); G 460/12 (SE-6; 9/16-18); 4) 3/8"-16 UNC x 4" (10 x 100) socket head cap screws G 461/0 (1/2" NPT); G 461/12 (SE-8; 3/4-16); (SE grade 8 or better) tightening torque lb-ft ( Nm) 2 G 412/0 (3/4" NPT); G 412/12 (SE-12; 1-1/16-12); 4) 3/8"-16 UNC x 4-3/4" (10 x 120) socket head cap screws G 413/0 (1" NPT); G 413/12 (SE-16; 1-/16-12); (SE grade 8 or better) tightening torque lb-ft ( Nm) 32 G 414/0 (1-1/4" NPT); G 414/12 (SE-20; 1-/8-12); 4) 3/8"-16 UNC x -1/2" (10 x 140) socket head cap screws G 41/0 (1-1/2" NPT); G 414/12 (SE-24; 1-/8-12); (SE grade 8 or better) tightening torque lb-ft ( Nm) * Subplates and valve mounting bolts must be ordered separately see R /8 annesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 231 City Line Road, ethlehem, P Tel. (610) Fax: (610) Rexroth Hydraulics Div., obile, 100 Old ansfield Road, Wooster, OH Tel. (330) Fax: (330) ll rights reserved Subject to revision Printed in U.S..