ARI Armaturen STEVI AS 350 DN15-50 EN - Manual (Page 3)

Rev. 0040322000 3413 Page 2-3
Operating and installation instructions
Y-pattern processing valve - STEVI
®
AS 350
4.0 Description
4.1 Scope of applications
Valves are used for „interrupting the flow of liquids, gases and vapours in chemical,
processing, and other plants“.
The information complies to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
A Y-pattern seat in the body will be closed by a plug, depending on the flow direction with or
against the media. The plug is connected with the piston via stem. The stem is sealed
within the guidance area between the valve body and control cylinder. The valve is actuated
with a piston via control pressure (air).
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If conditions exceed
these requirements, e.g. aggressive or abrasive media, the operator should
state the higher requirements when ordering.
STEVI AS350 with actuator of plastic ATG:
For application of the valves in systems of device group II
category 2 acc. to Directive 94/9/EC, the valves are
equipped with a dust filter and an indicating label. The
maximum medium temperature is +85°C.
Marking:
II 2 GD c IIB T6
To prevent the build up of static electricity, plastic valve
components must be wiped with a damp cloth.