Model 200
4 port configuration - 12,2mm PCD 2 Stage Mechanical Feedback Miniature Electrohydraulic Servovalve 40.0 17.0 22.0 40.0 2.8 42.0 34.0 All Ports dia. 4.0 on a P.C.D. 12.2 C'bored dia. 8.0 x 0.76 deep P C1 26.2
C2 R 23.8 Installation Data
Suggested mounting screws: M4 x 10mm high tensile steel socket head cap screws, torque to 3,5 N.m [31 lbf.in]. Electrical connection is available at 180 degrees to position shown (over R port as standard). Base seals: [6,0 mm I/D x 1,0 mm section]. Mounting surface requires a finish of Ra 0,8 micron; flat within 0,02 mm. Mass: 0,23 Kg. 200e0501 Manufactured by Star Hydraulics Ltd., 8A Beta Close, Tewkesbury, Glos., GL20 8SR, England (UK) Tel.: 01684 296176 Fax.: 01684 850714 Technical Specification
Threshold Hysteresis Null bias Null shift with 40°C temperature change 80% to 110% pressure change Pressure gain < 0,5% without dither < 3,0% without dither < 2,0% < 2,0% < 2,0% >30% supply pressure for 1% rated input signal, can be as high as 100% Supply pressure minimum recommended maximum continuous Proof pressure at pressure port at return port Burst pressure return port open External leakage Operating temperature range Fluid 15 bar 210 bar (standard) 150% max supply pressure 100% max supply pressure 250% max supply pressure zero -20°C to +130°C Petroleum based mineral oil 10 to 110 cSt at 38°C Fluorocarbon other materials on request 15 micron absolute or better (Beta 15 > 75) Seal material Supply filtration recommended 12 load flow [l/m] Figure 1 10 8 The nominal rated flow of a servovalve is the load flow under conditions of 100% electrical input and 70 bar total valve pressure drop. The load flow pressure characteristic closely approximates the theoretical square-root relationship of a sharp edged orifice (figure 1). The flow tolerance for standard servovalves is ±10% of the nominal rated flow at ±100% input signal. Flow gain at null is determined by the relationship of the spool and bushing metering edges and may vary with standard production toleran ces, flow gain in the region of ±5% rated current from null may range from 50% to 200% of the nominal flow gain (figure 2). The null leakage comprises of both pilot stage flow (tare leakage) and the second stage null leakage (table 1). 6 4 2 200e0501 0 200 150 100
Q rated 50 0 valve pressure drop [bar] Figure 2
100 Table 1
Nominal flow ratings at 70 bar differential [l/min]
±10% nominal flow gain Null leakage 140 bar supply [l/min] 0,5 0,5 0,6 Y-axis control flow % rated 80 60 2 4 7 20 40 50% specified flow gain -100 -80 -60 -40 -20 20 -20 40 60 80 100 -40 X-axis input current % rated Electrical Characteristics
Coil Specification Differential Rated Current [mA] 10 15 20 30 30 40 60 80 100 200 400 Resistance per coil [ohm] 1000 Rated Current [mA] 5 Series Effective Resistance [ohm] 2000 Rated Current [mA] 10 15 20 30 30 40 60 80 100 200 400 Parallel Effective Resistance [ohm] 500 100 600 150 400 40 20 11 13,5 11 11 The following are by special order only consult factory for details 200 7,5 400
1200 300 800 80 40 22 27 22 22 10 15 15 20 30 40 50 100 200 2400 600 1600 160 80 44 54 44 44 -100 Saturation effect with high flow valves -80 -60 Coil ratings are specified in terms of the differential rated current [mA] and the resistance per coil [ohm] External connections for standard polarity (flow out of C2) are:Parallel coil configuration: link A to C & B to D : A & C -ve, B & D +ve Red
Series coil configuration: A & D linked : B +ve, C -ve
200e0501 Green Blue Yellow A B C D Transient Response
100 position (%) A B 75 50 210 bar supply pressure 25 A = 2 l/m Q rated B = 7 l/m Q rated 0 0 5 10 15 time (ms) Dynamic Response
0 Amplitude (dB) -3 A
-6 -8 -10 Typical frequency response for model 200 at: 210 bar supply pressure 25% rated signal 40 degC nominal A = 7 l/min rated flow 200 175 150 125 100 Phase (degrees) 75 50 25 0 A 5 10 20 40 60 80 100 200 400 0 Amplitude (dB) -3 200 A
-6 -8 -10 Typical frequency response for model 200 at: 210 bar supply pressure 100% rated signal 40 degC nominal A = 7 l/min rated flow 175 150 125 100 Phase (degrees) 75 50 A
200e0501 25 0 5 10 20 40 60 80 100 200 400