ARI Armaturen CHECKO-D DN 125-350 EN - Manual (Page 3)

Rev. 0040106001 2613 Page 2-3
Operating and installation instructions
CHECKO
®
-D DN 125-350
4.0 Description
4.1 Scope of applications
Valves are used for „preventing mediums from flowing back along pipe lines“.
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 flowing medium presses against the bottom of the plug
(opening pressure: refer to the data sheet), thereby lifting it. The valve closes when the
pressure drops below the opening pressure.
This prevents the medium above the plug resp. behind the valve plate from flowing back.
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.
- The use in areas subject to explosion hazards is possible.
ATTENTION !
When sizing the check valves please note, that a particular volume flow is
necessary to bring the valve into a stable full-opened position
(refer to data sheet).
If this full-opened position is not achieved, the valve is oversized and will result
chattering noises. This means a higher abrasion and causes a valve malfunction.