Operating & Service Manual 4 OPS-804 Rev.01
3.2 Installing Bonnet Assembly
CAUTION:
The stem bearing assembly must be firmly lock down by the bonnet cap against the packing gland to
operate properly. Any slack or clearance in the bearing spacer, bearings due to improper assembly
would affect the operating torque as the needle bearings would no longer working effectively.
a)
Lightly grease stem and install to bonnet from the bottom.
b)
Lightly grease stem packing and slip over stem and evenly press them into bonnet cavity. Ensure no gr-
ease or water is trapped between to two packing. (Note: Stem Packing should be installed with U-cup
side facing down into bonnet pocket)
c)
Install packing gland over stem and make up to bonnet. The packing gland should be sitting butt tight on
top of bonnet.
d)
Install bearing assembly and bearing spacer over stem and insert thrust pin through bearing spacer and
stem. Rotate stem until stem/bearing assembly sits firmly on top of packing gland.
e)
Install the bonnet cap over the stem and make up snugly tight to bonnet.
3.3 Install Gate to Bonnet Assembly
a)
Lightly grease the barrel lift nut and insert to the gate. Carefully make up gate assembly to the stem by
left hand rotation, until the stem has fully engaged the lift nut and partially penetrate the gate.