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

Rev. 0040105004 0212 Page 3
Operating and installation instructions
ASTRA
®
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.
Do not use ASTRA valves for handling steam!
4.2 Operating principles
The valve is closed (plug/seat function) by turning the hand wheel clockwise.
The valve spindle is sealed by an EDD double flexible seal system.
The stress on the EDD double flexible seal system is relieved by the return seal when the
valve is fully open.
The position of the plug is shown on the digital display every complete turn and every tenth
and five-hundredths of a turn.
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.
ATTENTION !
Do not use tools to increase the torque on the hand wheel.
Fig. 1: DN 15- 200 with digital display Fig. 2: ≥ DN 250 with lift indicator