Product description
l When pressure in the actuator is released, the actuator can closed the valve automatically.
l When the fire occurs, the metal back seal of bonnet and stem can performed as a secondary sealing if the stem packing is failure.
l With a test port of back seal and test hole in case of failure of stem packing.
l The back pressure valve of actuator can release the pressure in case that the actuator is too high.
l The increased piston dimension allows the valve to be actuated under low pneumatic pressure.
l Actuator top shaft serves as a position indicator for the valve switch status.
l The actuator cylinder and piston Surface are treated by nitriding to increase corrosion resistance.
l Convenient for replacing of stem packing.