DeZURIK
Cylinder Actuator for Knife Gate Valves
February 2022
Page 4
D11040
Description
The cylinder used with DeZURIK gate valves is a pneumatic double-acting cylinder that has a
recommended supply pressure between 60 and 100 psi. Cylinder pressure not to exceed 100 psi, cylinder
can operate at less than 60 psi. Use proper cylinder sizing to determine operating pressure.
This cylinder is a pressure vessel. Pressure in the cylinders can cause personal injury
or equipment damage. Release pressure from both ends of the cylinder before
servicing.
Lubrication
The cylinder only requires lubrication when reassembling a unit that has been disassembled. When
reassembling, lubricate the Piston Seal (C11), O-rings (C12), Piston (C10) grooves and inside wall of
Cylinder Tube (C13) with Dow Corning No. 44 lubricant, or for cylinders that are for -40°C to -50°C (-
40°F to
–58°F) environments, lubricate with Dow Corning No. 55
lubricant.
Adjustments
Aligning the Cylinder
To work properly, the Piston Rod (C14) and gate must be aligned.
The mounting holes in the cylinder and yoke are designed to allow
for adjustment. Visually check the alignment with the valve in the
open and close positions, and adjust as needed.
1.
Align the Piston Rod (C14) and the gate with each other.
2.
Check the Piston Rod (C14) and gate alignment in the valve
open and closed positions.
3.
Adjust the cylinder position if needed.
Note:
Oversized mounting holes in the cylinder and yoke allow for adjustment.
Valve Support
The valve may be mounted in any position around the pipeline, however it is best to mount the valve with the
cylinder in a vertical position. If the valve is installed with the cylinder in a position other than vertical, the
customer must provide support on valves that are 8 inches and larger. Support can be provided on the outer
surfaces of the legs, close to the cylinder. See the installation drawing for dimension location of the support.
Do not mount supports on the Cylinder Tube (C13).
Figure 1: Connection to
Valve
Piston Rod
Clip
Gate