6. OPERATIONS
6-1) Operation of the 3-way valve
① Equalizing Valve
② Low Pressure Valve (LP Valve)
③ High Pressure Valve (HP Valve)
Fig. 6-1
(1) For initial setup, all the valves must be closed
(2) After complete installation, first release Equalizing valve, then replease HP valve at this
point check whether the pointer is pointing at "0", if there is an error, must perform
zero adjustment.
(3) Before operating other valves, make sure all the air is out of the DP gauges by opening
the air vent at the top of the housing. left over air could cause error in measuring DP.
(4) Then, open LP valve. after opening LP valve, close the Equalizing valve,
Then make sure it is indicating correct value. now, it is ready to use.
6-2) In case of DP gauge is malfunctioning, release Equalizer valve,
Then close LP valve. now, close HP valve, then close equalizer valve.
Release all the air inside the DP gauge by opening up the air vent.
Now take DP gauges to manufacturing for repair service.
