ARI Armaturen STEVI BBD 415 DN 25-50 EN - Manual (Page 3)

Rev. 0040321000 0714 Page 2-3
Operating and Installation Instructions
Straight-through blow-down valves - STEVI
®
BBD 415
4.0 Description
4.1 Applications
Blow-down valves are used to "blow down steam boilers".
All information provided here conforms to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
Special markings on the valve must be taken into account.
Refer to the data 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 principle
The blow-down valves are specially designed for blowing down steam boilers with
compressed air. When opened for a short period by a pneumatic actuator or manually
operated with a lever, they form an eddy of water that entrains sludge from the boiler end.
Corrosion is effectively prevented.
The flow always approaches a blow-down valve in the closing direction. The closing force
of the springs is supported by the medium pressure.
ATTENTION !
- Refer to the data sheet for applications, limits of use and operating options.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If the actual
conditions exceed these requirements, e.g. aggressive or abrasive media, all
non-standard requirements should be indicated in the order.