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. 4 OF 20
INSTALLATION
OPERATION &
MAINTENANCE MANUAL
The actuators have simple operational characteristics:
- Port A is connected to the interior cavity between the pistons
- Port B is connected to the end caps cavity dircting the air flow into the end caps area.
AIR TO AIR ACTUATORS
In figure 1.a we see that by pressurizing port B and allowing air to exhaust trough port A we have the normally
closed position for the actuator.
If we exchange the pressurization from B to A and the exhaust from A to B (as shown in figures 1.B e 1.D), the
pinion will rotate in the counter clockwise direction and we'll see the open position of the actuator.
SPRING RETURN ACTUATORS
In the case of SPRING RETURN actuators, with the pressurizing of port B and the port A connected to the
exhaust, in the case of air failure spring return will satisfy the conditions shown in figures 1.A e 1.C.
Although the
actuators typically operate, counter clockwise to open and clockwise to close, it is possible
to change this stile of operation.
Figures 1.C e 1.D show the same spring return actuator with the piston orientation changed to convert the
actuator from a fail clockwise to a fail counter clockwise unit (as described in Section 10.0: FCCW to FCW conversion).
4.0 ACTUATORS INSTALLATION
The actuators are designed to be easy to install. The actuators come with one or more ISO 5211 (DIN
3337) standard bottom mounting pattern, selon the model, for direct assembling to the valves to be drived or to the
coupling, when necessary.
On top face of
actuators there is a NAMUR standard mounting pattern for easy installation of accessories
for position survey and/or control devices (Microswitches box, Positioners, etc).
The pinions of
actuators are the uniques on the market having, as standard, a poligonal bottom female
key, that allow the assembling on valves stem, or coupling, with square key at 45° or at 90° indifferently.
On request, bottom pinion female key may be done at double D or cylindrical with one or two keyways:
Poligonal key
Double D key
Keyways key
The ports are NAMUR standard, for easy solenoid valve connection, on GTX.110 through GTX.255, while on
GTX.52 through GTX.92, that have proprietary type ports, it is available a special mounting adapter plate for connection
with NAMUR standard solenoid valves (See figure 9, pag. 12).
For these lower dimensions actuators, are available spacial solenoid valves, of G.T. Componenti production,
for easy direct assembling on the actuator, as NAMUR standard ones, avoiding the adapter plate needing (See pag.
12).
3.0 OPERATION CHARACTERISTICS
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