CALEFFI NA51 Series, Руководство пользователя

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Installation
The Caleffi NA51 series spring check valve may be installed in either a vertical or horizontal position.
Pipe lines should be thoroughly cleaned and flushed before installing the check valve. A strainer should
be installed ahead of the check to prevent unnecessary malfunction. Install shutoff valves on inlet and
outlet of check to facilitate servicing and maintenance. Install the check valve with the arrow on the valve
body pointing in the direction of flow. Allow a minimum of 5 pipe diameters upstream straight pipe to
reduce turbulence at the check valve.
Service and Maintenance
Turn off supply water, or make sure inlet and outlet shutoff valves are in closed position, before servicing.
The Caleffi NA51 series check valves have union connections for easy removal to inspect, clean, and
either replace the plastic check valve insert, or replace the entire check valve altogether. The check
valve may be disassembled and cleaned to remove dirt, debris or scale. Always use new washers when
reassembling and do not over tighten the union nuts. The plastic check valve insert can be replaced, if
necessary, using a hammer and punch; it cannot be re-used, a new check valve insert will be necessary.