What is pilot operated?
Pilot operation is the main force required to open the valve is provided by the media pressure. The pilot can be very small as it only controls the flow of a small diameter impulse line that allows the fluid to open the main diaphragm or piston.
What does 2 way mean?
2 Way or 2 port air operated valves refer to the line connections in that there is a single inlet and outlet which makes them ideal for flow isolation. For most of these valves, the flow direction through the valve must be from the inlet to the outlet as reverse flow will cause the valves to fail or operate unreliably.
Depending on the model, 2 way pilot operated valves are used with liquid or gaseous media and can incorporate many varieties of options:
Normally closed or normally open?
In valve terms:
Most air operated valves will only stay in the applied pilot pressure position while the pilot pressure exists. They will revert to the rest position as soon as pilot pressure is removed.
M22 Normally Closed
M23 Normally Open
M65 Normally Closed
M Series Overview
SX90 Normally Closed Angle Seat Piston
SX91 Normally Open Angle Seat Piston
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