DeZURIK
Cylinder Actuator for Knife Gate Valves
February 2022
Page 9
D11040
Disassembling the Cylinder
This cylinder is a pressure-containing vessel! Removing any parts while under pressure
could cause personal injury or equipment damage. Release the pressure from both ends of
the cylinder before attempting disassembly or repair.
1. Shut off the air/fluid supply to the cylinder and relieve pipeline and cylinder pressure.
2. Disconnect the air supply lines
Note:
When flexible tubing is used,
only one swivel connector is used on
each piece of tubing. The swivel
connector is located on the end of
the tubing attached to the cylinder
port.
3. Remove the Nuts (C5) and Washers (C6)
from the Tie-Rods (C4).
4. Remove the Cylinder Cap (C7) and remove
the O-ring (C8) from the Cylinder Cap (C7).
5. Remove the Cylinder Tube (C13), Piston Seal (C11) and O-ring (C12). Clean the parts and the grooves
in the Piston (C10). See Figure 4.
Note:
Rotating the Cylinder Tube (C13) while pulling makes it easier to get it off the Piston
(C10).
6. Remove the Piston Rod (C14) assembly
and remove the O-ring (C8) from the
Cylinder Head (C16).
Note: Cylinders for -40°C to -50°C
(-40°F to -58°F) service
applications do not have a Piston
Seal (C11). These cylinders have
a larger O-ring (C12) in the Piston
(C10).
7. Remove Cylinder Cartridge (C15). Use a
spanner wrench to unscrew the Cylinder Cartridge (C15) out of the Cylinder Head (C16). See Figure 5.
8. Clean all parts thoroughly. Replace damaged parts.
PISTON
O-RING
PISTON SEAL
CYLINDER TUBE