Samson 3222 Series User Manual

EB 5866 EN 3-5
Design and principle of operation
3.3 Additional ttings
Strainers
We recommend installing a SAMSON
Type2NI Strainer upstream of the valve. It
prevents solid particles in the process medi-
um from damaging the valve.
Î Refer to the instructions in the 'Installa-
tion' section.
Bypass and shut-off valves
We recommend installing a shut-off valve
both upstream of the strainer and down-
stream of the valve and installing a bypass
line. The bypass ensures that the plant does
not need to be shut down for service and re-
pair work on the valve.
Intermediate insulating piece
An intermediate insulating piece (1990-
1712) must be used under the following con-
ditions:
− For medium temperatures from –15°C
(red brass) or –10°C (EN-GJS-400-18-
LT) to +5°C (actuators according to
Table 3-1)
− In networks with a constant medium
temperature >135°C (TROVIS5724-3,
TROVIS5724-8, TROVIS5725-3,
TROVIS5725-8, Type5824, Type5825
and Type5827 Actuators)
− For liquids >120°C (TROVIS5757-3,
TROVIS5757-7 and Type5857 Actua-
tors)
Î Refer to the instructions in the 'Installa-
tion' section.
Type/
TROVIS
Fail-safe action:
Actuator stem Valve size DN Thread size G
Extends Retracts 15 20 25 32 40 50 ½ ¾ 1
Pneumatic actuators
2780-1 • • • • • • • • • • •
2780-2 • • • • • • • • • • •
1)
Version with half transit time
2)
The product will be discontinued in the near future. See Data Sheet uT5827 for replacement device.

Samson 3222 Series Specifications

General

Brand	Samson
Model	3222 Series
Category	Valve Positioners
Language	English