
Single Acting, Normally Closed(NC)-Enter Above Seat
Suitable for condensable media, such as air, steam; and low liquid media.

Single Acting, Normally Closed(NC)-Enter Below Seat(NO Water-hammer)
Flow come from below seat, avoid water hammer.

Double Acting, Normally Closed(NC)-Enter Above Seat
Suitable for higher △P; valve could be closed if there is emergency.

Double Acting, Normally Closed(NC)-Enter Below Seat
Flow come from below seat, avoid water hammer, suitable for higher △P

Normally Open(NO)-Enter Above Seat
Suitable for long time valve open demand; Taking off silencer, valve could be changed to double acting-NO type.

Normally Open(NO)-Enter Below Seat
Suitable for long time valve open demand; avoid water hammer. Taking off silencer, valve could be changed to double acting-NO type.
