Boss Gas Pressure Regulator 356

•Unscrew and remove the cap (1) from the top cover (4)

•Completely loosen and take out the adjustment screw (2)

•Remove the spring (3) from the top cover (4) and replace it with the new spring

•Place the washer (26) on the new spring once again

•Tighten the adjustment screw (2) and after starting the system as shown in 4.0, set the outlet pressure to the desired value as shown in 4.2

•Screw the cap (1) back on and if necessary, seal it in that position using the appropriate seal holes (if present);

Check the condition of the filtering element (21) as follows*

• Loosen the fastening screws (17) and very carefully remove the bottom cover (16) from the body (11)

• Extract the filter element and check its conditions. Blow it and clean it and, if necessary, replace it (see figures “a” and “b” below for the positioning)

• Check the conditions of the sealing O-Ring of the bottom cover (16) and replace if necessary

• Make sure the sealing O-Ring (18) of the bottom cover (16) is inside the relevant groove before putting it back on

• Reassemble the bottom cover (16) and secure it in its original position, being very careful not to “pinch” or damage the O-ring during tightening.;

•Use a suitable calibration tool to ensure the bolts are tightened as indicated in 3.2;

•Check the tightness of the flanged/threaded connections on the system

•Check the tightness and operation of the regulator

It is the responsibility of the final user or installer to define the frequency of these checks based on the severity of the service conditions.;