Owner's manual

Series 256 Servovalve Product Information
18
Specifications
Introduction
Static Performance Specifications
Values are typical for Series 256 Servovalves operated at the recommended
hydraulic fluid filtration levels.
Dynamic Performance Specifications
The dynamic data is derived from typical Model 256 Servovalve driven with a
valve controller with “rate” compensation. A constant amplitude sine wave was
used as the input signal to the valve controller. The amplitude was plus-or-minus
the main stage, full-stroke, and LVDT voltage.
M
ODEL*RATED FLOW NOMINAL GAIN PRESSURE
G
AIN
PRESSURE
C
OEFFICIENT
NULL FLOW
L/MIN GPM L/MIN/
%
STROKE
GPM
% STROKE
(% SUPPLY/
%
STROKE)
CM
3
/
KGF-SEC
IN
3
/SEC/PSI)
L/
MIN GPM
256.04 150 40 2.2 0.58 100 0.30 1.3x10-3 9.5 2.5
256.09 340 90 6.0 1.6 150 0.56 2.4x10-3 13.0 3.5
256.18 680 180 10.6 2.8 200 0.73 3.1x10-3 21.0 5.5
256.25 950 250 16.0 4.2 160 1.38 5.9x10-3 23.8 6.3
256.40 1500 400 29.0 7.7 250 1.38 6.9x10-3 20.4 7.5
MODEL*RATED FLOW PILOT FLOW FULL FLOW
F
REQUENCY
90º PHASE
S
IGNAL
†
SPOOL STROKE RISE TIME (T
R
)
(
MILLISECONDS)
L/
MIN GPM L/MIN GPM HZ HZ 90% OPEN 10% OPEN
256.04A-01 150 40 3.8 1 80 130 4.8 3
256.09A-01
256.09A-02
340
340
90
90
3.8
9.5
1
2.5
30
80
120
130
9
4.6
3.5
4.3
256.18C-01
256.18C-02
256.18C-05
680
680
680
180
180
180
3.8
9.5
19
1
2.5
5
20
30
50
90
100
100
12
7
5.5
3
2.2
1.8
* Performance information is provided for the models listed. Contact MTS for performance information
for Models 256.18D and 256.xxB.
† At 10% spool stroke.
‡ These are estimated values. All other values are typical.