Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
15
14. Each new piston ring (key 6) is furnished as a complete ring, and each must be broken into two approximately equal
portions. Do this by placing the ring on edge on a smooth, hard surface and striking the ring squarely with a
hammer.
15. Install the piston ring into the groove in the retainer (key 2C). Be sure to match the broken ends when installing the
ring sections in the groove.
CAUTION
To avoid excessive leakage and seat erosion, the valve plug must be initially seated with sufficient force to overcome the
resistance of the Bore Seal and contact the seat ring. You can correctly seat the valve plug by using the same force
calculated for full load when sizing your actuator. With no pressure drop across the valve, this force will adequately drive
the valve plug to the seat ring, thus giving the Bore Seal a predetermined permanent set.
With full actuator force applied and the valve plug fully seated, align the actuator travel indicator scale with the lower end
of valve travel. Refer to the appropriate actuator instruction manual for information on this procedure.
Seat Ring Maintenance
With the seat ring (key 9) removed, according to the Disassembly procedure, proceed as appropriate:
CAUTION
Be careful not to scratch the surfaces of the seating surface or groove in the seat ring or the surfaces of the replacement
parts.
