DeZurik D11040, Быстрый старт, Страница: 11 / 12

DeZURIK
Cylinder Actuator for Knife Gate Valves
February 2022 Page 11 D11040
Troubleshooting
External Leakage
Cartridge leak
Worn or damaged
piston rod or cartridge
Replace piston rod if
surface is rough
Replace piston rod and
rebuild or replace
cartridge if worn
Cylinder tube seal leak
Loose tie rods
Tighten tie rod nuts to
recommended torque
as per bore size. See
table A
Excessive pressure
Reduce pressure to
determine max.
pressure rated limits
Replace o-rings and
Damaged O-rings retorque tie rods. See
table A
Internal Leakage Piston seal leakage
Piston seal wear
Replace seal o-ring as
required
Cylinder drifts
Pressurize one side of
the cylinder piston and
disconnect air/fluid line
at opposite port. If no
leakage, find cause of
cylinder drift in other
component parts in the
circuit
Cylinder Fails to Move the Load
Pressure is too low.
Check pressure at cylinder, make sure it is to
circuit requirements
Piston seal leakage
Cycle cylinder by
operating the valve,
watch air/fluid flow at
valve exhaust ports at
end of cylinder stroke.
Replace piston seals if
flow is excessive
Cylinder is undersized
for the load
Replace cylinder with one of a larger bore size
Piston rod broken Contact DeZURIK
Erratic or Chatter Operation
Load misalignment,
excessive friction at
cartridge or piston
Correct alignment of cylinder to load
Load requirements are
too closely sized to
cylinder
Install larger cylinder
Static and kinetic
friction Install speed control valves to provide back
pressure for controlling stroke