User guide

Determining Maximum Rotational Inertia (JT)
Series 215 Rotary Actuator Product Manual Operation
59
3. After calculating the total rotational inertia (J
T
), compare the value to the
maximum allowable J
T
for the specific actuator and servovalve combination
indicated in the following. If the maximum allowable J
T
is exceeded, the
test setup must be altered to reduce the total rotational inertia or an
additional restraint must be provided to keep the actuator rotor vane from
impacting the internal actuator rotor vane stops at full velocity.
Maximum Allowable Rotational Inertia (J) When Using Only Internal Actuator Rotor Vane Stops
U.S. C
USTOMARY
SERVOVALVE FLOW MAX J FOR ACTUATOR MODEL (LBM·IN.
2
)
M
ODEL RATED
(
GPM)
P
EAK*
(
GPM)
215.32 215.35 215.41 215.42 215.45 215.51
252.23 5.00 9 39 302 1825 32905 305558 3020992
252.24 10.00 17 -- 76 456 8226 76389 755248
252.25 15.00 26 -- 34 203 3656 33951 335666
252.31 25.00 43 -- -- 73 1316 12222 120840
256.04 40.00 70 -- -- -- 514 4774 47203
256.09 90.00 156 -- -- -- -- 943 9324
SI METRIC
SERVOVALVE FLOW MAX J FOR ACTUATOR MODEL (KG·M
2
)
M
ODEL RATED (L/
MIN)
P
EAK* (L/
MIN)
215.32 215.35 215.41 215.42 215.45 215.51
252.23 19.00 33 0.01 0.09 0.54 9.67 89.49 884.89
252.24 37.00 64 -- 0.02 0.13 2.42 22.37 221.22
252.25 56.00 97 -- 0.01 0.06 1.07 9.94 98.32
252.31 93.00 161 -- -- 0.02 0.39 3.58 35.40
256.04 151.00 262 -- -- -- 0.15 1.40 13.83
256.09 340.50589--------0.282.73
* Flow through the valve at 3,000 psi (∆P). Using reduced system pressures (∆P) will
decrease peak flow Q peak = Q rated
Decreasing peak flow will allow an increase in acceptable inertia (J). Refer to “Series 215
Rotary Actuator Ratings by Model” for the maximum velocity into vane stops where W= Q
peak x 3.85 in.3/sec Displacement in.3/rad.
ΔP
1000
------------