ARI Armaturen ASTRA Plus DN250-400 EN - Manual (Page 3)

Rev. 0040105005 0212 Page 3
Operating and installation instructions
ASTRA
®
Plus
4.0 Description
4.1 Scope of applications
Line regulatiValves are used for „shut-off and/or throttling of media“.
Valves with a defined characteristic for heating and cooling systems.
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
The valve is closed (cone/seating function) by turning the hand wheel clockwise. Do not
use tools to increase the torque on the hand wheel. The valve stem is sealed by a bellows
and an outer safety stuffing box.
The position of the valve cone is shown on the digital display every complete turn and every
tenth and five-hundredths of a turn, is also shown (DN 15 - 150)
Over DN 200 the lift is seen on the lift indicator.
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.
- Valves made from grey cast iron are not authorised for use in systems subject
to TRD 110.
Fig. 1: DN 15- 150 with digital display Fig. 2: ≥ DN 200 with lift indicator