GESTRA RK 49 Instrucciones De Montaje página 10

Important Safety Note
The valve must only be installed by qualified staff.
Qualified staff are those persons who – through adequate training in
engineering, the use and application of safety equipment in accordance
with regulations concerning safety systems, and first aid & accident
prevention – have achieved a recognised level of competence
appropriate to the installation and commissioning of this device.
Proper Use
The non-return valves RK are automatic-stop check valves used in pipes
to prevent a backflow of fluid within the admissible pressure/
temperature ratings.
Contact the Factory for specific recommendations concerning the
chemical resistance and suitability of the valve material in a given
application.