User instructions - Shearstream HP - VLENIM0027-01 03.08
11
Table V: Troubleshooting ShearStream Ball Valves
Failure Probable Cause Corrective Action
Valve moves to failure position,
excessive air bleeding from
transfer case
1 Failure of actuator stem O-ring 1 Replace actuator stem O-ring
2 Failure of sliding seal assembly 2 Repair or replace stem adapter/
linkage assembly
Jerky shaft rotation 1 Overtightened packing box 1 Retighten packing box nut to slightly
over finger-tight
2 Improper adjustment of lever arm on
shaft causing arm to contact transfer
case, thus failing to convert torque
2 Readjust lever arm; see actuator
maintenance instructions
3 Actuator cylinder wall not lubricated 3 Lubricate actuator cylinder wall with
silicone lubricant
4 Worn piston O-ring allowing piston
to gall on cylinder wall
4 Replace O-ring; if galling occurred,
replace all damaged parts
5 Worn actuator stem O-ring causing
actuator stem to gall on stem collar
5 Replace O-ring; if actuator stem is
galled, replace it
6 Worn (or damaged) thrust bearing,
shaft bearing or packing followers
6 Disassemble and inspect parts; replace
any worn or damaged parts
Excessive leakage
through seal
1 Improper adjustment of external
stroke stops on actuator
1 Adjust the external stroke stops; see
maintenance instructions
2 Worn or damaged seal 2 Replace seal
3 Damaged ball sealing surface 3 Replace ball (and shaft, if worn)
4 Improper handwheel adjustment
acting as limit-stop
4 Adjust handwheel until ball seals properly
5 Ball not centered in body I.D. 5 Center ball; replace damaged seals
Leakage through
line flanges
1 Dirty line gasket surfaces 1 Clean gasket surfaces, reinstall valve
2 Worn gaskets 2 Replace gaskets
3 Improper torque on line flanges 3 Tighten line flanges evenly and comp-
letely (see Table I for proper torque)
4. Flange or pipe misalignment 4 Realign flanged ends with piping
Leakage through packing box 1 Loose packing box nuts 1 Tighten packing box nuts over finger-tight
2 Worn or damaged packing 2 Replace packing
3 Dirty or corroded packing box 3 Clean body bore, stem, replace packing
Valve slams, won’t open, or
causes severe water hammer
1 Improper valve installation 1 See step 2 in the “Installation”
section and correct flow direction
Shaft rotates, ball remains open
or closed
1 Broken shaft 1 Replace shaft
Actuator operates, shaft does
not rotate
1 Broken internal actuator parts 1 Refer to appropriate actuator
maintenance instructions
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