ATTUATORI .
- PNEUMATIC ACTUATORS AND ACCESSORIES -
UsermanING ISSUE .10 March 2004
GT ATTUATORI S.r.l. REA MI 1558400 FAX (02) 90390368
V.le Europa 17 - 20090 Cusago Partita IVA e Cod.Fisc.12449540157 TEL (02) 90390322
Milan - ITALY- E-mail g.trevisan@iol.it
www.gtrevisan.it
PAG. 18 OF 20
INSTALLATION
OPERATION &
MAINTENANCE MANUAL
EXAMPLE
Given information: Valve Opening Torque ( VOT ) = 85 Nm.
Valve Closing Torque ( VCT ) = 80 Nm.
Minimum pressure available = 5 Bar
20% increase of VOT = 90 x 1.2 = 102 Nm. total
20% increase of VCT = 85 x 1.2 = 96 Nm. total
14.1 Move down the SPRING O° column and the actuator pressure column ( remember to use the correct
actuator air pressure column ) until you find torque values, in the same row, that are larger than the two valve torque
values.
Follow across that row to determine the actuator size and cartridge spring configuration.
Note: Stroke time is equal for opening
and closing strokes.
Time shown is for entire go-and-back cycle.
Cicle tested at 6 Bar and with 75% load of
available torque.
Type SPRINGS 0° 5 Bar
K2 51 195
K3 76 150
GTXN.127x90 K4 102 105
K5 127 60
K6 153 15
NOTE: this table is an excerpt from the sinzing chart provided by
G.T. Componenti s.r.l.
To satisfy all conditions of this application, we compare
the VOT to column marked SPRING O°, and the VCT to column
of 5 Bar. Since the GTXN.127x90.K4 satisfies both conditions we
select this actuator.
TYPE CYCLE TIME (Sec.)
GTX. 52x90 0.158
GTX. 63x90 0.214
GTX. 75x90 0.333
GTX. 83x90 0.429
GTX. 92x90 0.444
GTX.110x90 0.461
GTX.118x90 0.600
GTX.127x90 0.857
GTX.143x90 1.580
GTX.160x90 1.620
GTX.190x90 3.220
GTX.210x90 3.330
GTX.254x90 6.000
GTX.255x90 7.500
GTX.300x90 9.340
14.0 ACTUATOR CYCLE TIME
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