Main Valves AM3 Series

Technical parameters：

Nominal pressure: 2.8MPa         Applicable temperature:-50℃～+150℃

Test pressure: 4.2MPa                 Applicable medium:ammonia,fluorine,etc.

Characteristics:

- Flow regulating valves, servo-operated by different pilot valves screwed-in the main valve or mounted in an external pilot line.

- The AM3 are designed to use with ammonia and other common fluorinated refrigerants, for liquid, suction, discharge 

  or defrosting lines, and they have three ports, P,S1 and S2, to screw-in two or three pilot valves.

- The relations between the ports where it is possible to screw-in the pilot valves  on the AM3, are showing below:

• The pilot valves on the ports S1 and S2 are connected in series. The main valve will be closed

  if any one of the pilot is closed. The main valve will be opened if both of the pilots are openned.

• The pilot valve screwed-in P, isconnected in parallel with the pilot valves in ports S1 & S2, so the

  AM3 valve will be open if the pilot in P is open, irrespective if the S1 or S2 pilot valves, are open

  or closed. The main valve will be closed if the pilot in P is closed and at least one of the pilot

  valves in S1 or S2,are closed at the same time.

- The degree of opening of AM3 valves is function of the differential pressure  

   between the inlet and outlet,so if the pressure difference is △p = 0.3 bar, the 

   main valve will befully open, and if it is △p=0.2-0.3 bar, the degree of opening

   will be correspondingly proportional to △p.