DeZURIK
Cylinder Actuator for Knife Gate Valves
February 2022
Page 10
D11040
Reassembling the Cylinder
1. Clean bore of Cylinder Head (C16) and lubricate with Dow Corning Number 44 lubricant, or Dow
Corning Number 55 on cylinders used in - 40°C to - 50°C (-40°F to
–58°F) service.
2. Lubricate the O-ring (C8) and place it on the Cylinder Head (C16).
3. Clean and thread in Cylinder Cartridge (C15) in to the Cylinder Head (C16).
4. Carefully install the Piston Rod (C14).
5. Lubricate the Piston Seal (C11), O-ring (C12) and cylinder groove with Dow Corning Number 44
lubricant and place the O-ring (C12) and Seal (C11) on the Piston (C10). For cylinders for - 40°C to -
50°C (-40°F to
–58°F) service applications, a Piston Seal (C11) is not used and Dow Corning No. 55
lubricant should be applied.
6. Carefully slide the Cylinder Tube (C13) over the Piston (C10). The Piston Seal (C11) must be well
lubricated. Start the Cylinder Tube (C13) at a 45° angle and rotate it into position onto the Piston (C10).
See Figure 6.
7. Lubricate the O-ring (C8) and place it on the Cylinder Cap (C7).
8. Place the Cylinder Cap (C7) on the Cylinder Tube (C13) and place the Washers (C6) and Nuts (C5) on
the Tie-Rods (C4). Tighten the Nuts (C5) to the torque listed in Table A.
Figure 6
—Assembling Cylinder