Fail-Safe Action - Samson 3275 Mounting And Operating Instructions

The actuator with 804 cm² area does need a
yoke (see Fig. 3). The valve accessories are
mounted over the NAMUR interface.
Refer to the mounting and operating instruc-
tions of the valve accessories to be mounted
for more details on their attachment and the
accessories required.

3.1 Fail-safe action

The double-acting piston actuator has no
springs. A defined final position is not
reached when the signal pressure is reduced
or the air supply fails.
S
A9
A8
A7
S
A3
A2
A1
Fig. 3: Type 3275 Actuator (804 cm²)
EB 8314 EN
Design and principle of operation
A10
A1 Piston rod
A2 Piston rod seal
A3 Plain bearing
A4 Base
A7 Piston seal
A8 Piston guide band
A4
A9 Piston
A10 Cover
S Signal pressure
connection
11