SPECIFICATIONS 744 Series Fluid Supply: 744 Series Servovalves Rated Flow T olerance: +10% are intended to operate with constant Hysteresis: < 3% Servovalves supply pressure. Threshold: < 0.3% Supply Pressure: Null Shift: with supply pressure Minimum: 500 psi (35 bar) 1000 psi change: < 2% Maximum: 2000 psi (140 bar) Frequency Response: Proof Pressure: Typical response characteristics 150% of supply pressure at P port are shown in Figures 1 and 2. 100% of supply pressure at R port Step Response: Fluid: Typical transient responses are shown Compatible with common hydraulic in Figure 3.The straight line portion fluids. Recommended viscosity of a response represents saturation range: 60-450 SUS @ 100˚F flow from the pilot stage which will (10-97 cSt @ 38˚C) increase with higher supply pressures. Cleanliness Level: ISO DIS 4406 code 16/13 max. 14/11 recommended Operating T emperature: -40˚F (-40˚C) (maximum fluid viscosity: 6000 SUS) Maximum: +185°F (+85°C) The 744 Series Servovalve is a two-stage design which flows up to a maximum of 70 gpm at 1000 psi valve drop.The output stage is a closed center, four-way, sliding spool.The pilot stage is a double-nozzle and flapper, driven by a double air gap, dry torque motor.The valve design is simple and rugged for dependable, long life operation. Specific design features include a first stage field replaceable filter, an internal null adjust which acts as an electrical failsafe, and a second stage failsafe in the event of a loss of hydraulic supply pressure. The valves are FM approved for non hazardous locations and are primarily used on steam turbine applications. FREQUENCY RESPONSE +2 170 +2 170 PS = 2000 psi PS = 2000 psi 0 150 0 150–100%:–40%: 50 gpm 50 gpm -2 130 -2 130 70 gpm 70 gpm -4 110 -4 110 -6 90 -6 90 -8 70 -8 70 -10 50 -10 50 -12 30 -12 30 -14 10 -14 10 1 2 3 5 7 10 20 30 50 70 100 1 2 3 5 7 10 20 30 50 70 100 Frequency (Hz) Frequency (Hz) Figure 1 - Full Amplitude Figure 2 - Reduced Amplitude Frequency Response Frequency Response Model Response Rated Flow Internal Leakage Rated Current Coil Nom (1000 psi) (1000 psi) (single coil) Resistance STEP RESPONSE gpm lpm gpm lpm mA ohms 100 744F001 Std. 70 265 1.3 4.92 17 500 80 744F002 Std. 50 189 1.3 4.92 96* 22 60 744F003 Std. 50 189 1.3 4.92 34.5 125 PS = 1000 psi 40 50 gpm 744F004 Std. 70 265 1.3 4.92 96* 22 70 gpm PS = 2000 psi 20 50 gpm 70 gpm Available seal materials:VITON (Std.), BUNA or EPR. * 3 coil torque motor. 0 0 50 100 150 200 Time (ms) Figure 3 - Step Response 1000 psi 2000 psi Amplitude Ratio (dB) Stroke (% of max) Phase Lag (degrees) Amplitude Ratio (dB) Phase Lag (degrees) 744 SERIES INSTALLATION DRAWINGS STANDARD ELECTRICAL CONFIGURATION 3.38 [85.9] Torque ELECTRICAL CONNECTOR 1.69 MATES WITH BENDIX PYGMY Motor Coils [42.9] CONNECTOR PC06-10-6S Connector A B C D E F Pins External connections and electrical polarity for flow out control port No. 1 are: Single Coil: A+, B-; or C+, D- Series Coils: tie B to C; A+, D- Parallel Coils: tie A to C and B to D; A & C+, B & D- 8.85 ACCESSORIES [224.8] 6 x 4.43 [112.5] .332 [8.43] thru Mating Electrical Connector: M .0075 [.36] A B 1.375 1.375 2 X P/N 78068-8 [34.93] [34.93] .88 [22.4] (PC06E-10-6S(SR)) Suggested Mounting Bolts: 2.38 2.063 P/N A31324-224B [111.3] [52.40] 5/16 – 18 NC x 1.50 long 4.75 4.125 [120.7] Socket Head Cap Screw [104.78] 2 X Ø 3.75 Replacement Filter Kit: 2 X [95.3] .29 P/N 52418-2 [7.4] NOTES ACCESS TO FIELD REPLACEABLE FILTER 2.23 1.40 MOOG CONTROLS PART NO. B52418-1 Valve Weight: 18.50 lb (8.38 kg) [56.6] [35.6] (.125 HEX SOCKET & .073-72 UNF-2B THD) Base O-Ring Size: 0.139 [3.53] sect. x 1.046 [26.57] (universal size -215) Aux. Pilot Pressure Port O-Ring Size: 0.070 [1.78] sect. x .301 [7.65] 6.58 (universal size -011) [167.1] 5.96 Aux. Pilot Pressure Port: [151.4] 4.07 Standard on all models. 3.80 [103.4] [96.5] Null Adjust: 2 X Internal (factory adjusted). Standard 1.00 P [25.4] configuration is Pressure to control -A- port No. 2. Pressure Port Surface Finish: .014 [.36] M A B Pilot Supply Port .014 [.36] M A B Surface to which valve is mounted Control Port No. 1 1.375 1.375 ΔΔ 63 .014 [.36] M A B requires [ ] finish, flat within [34.93] [34.93] Control Port No. 2 0.0015 [0.04] TIR. .014 [.36] M A B .875 [22.23] 1.450 [36.83] .875 [22.23] Return Port M .014 [.36] A B The products described herein are subject to change at any time without notice, including, but not limited to, product features, specifications, and designs. Industrial Controls Division Moog Inc., East Aurora, NY 14052-0018 Telephone: 716/655-3000 Fax: 716/655-1803 Toll Free: 1-800-272-MOOG CDL6621 Rev. C 500-215 301