DeZurik D11040 Manuale utente

DeZURIK, Inc. Sartell, Minnesota USA | Phone: 320-259-2000 | www.dezurik.com | [email protected]

Cylinder Actuator for Knife

Gate Valves

Instruction D11040

February 2022

Instructions

These instructions are intended for personnel who are responsible for the installation, operation and

maintenance of cylinder actuators.

Safety Messages

All safety messages in the instructions are flagged with the word Caution, Warning or Danger. These

messages must be followed exactly to avoid equipment damage, personal injury or death.

Safety label(s) on the product indicate hazards that can cause equipment damage, personal injury or death.

If a safety label becomes difficult to see, or if a label has been removed, please contact DeZURIK for

replacement.

Personnel involved in the installation or maintenance of valves should be constantly alert

to potential emission of process material and take appropriate safety precautions. Always

wear suitable protection when dealing with hazardous process materials. Handle valves

which have been removed from service with the assumption of process material within the

valve.

Inspection

Your cylinder actuator has been packaged to provide protection during shipment. Carefully inspect the unit

for damage upon arrival and file a claim with the carrier if damage is apparent.

Parts

Recommended spare parts are listed on the assembly drawing. These parts should be stocked to minimize

downtime.

Order parts from your DeZURIK sales representative, or directly from DeZURIK. When ordering parts,

please include the 7-digit part number and 4-digit revision number (example: 9999999R000) located on

the data plate attached to the valve assembly. Also include the part name, the assembly drawing

number, the balloon number and the quantity stated on the assembly drawing.

DeZURIK Service

DeZURIK service personnel are available to install, maintain and repair all DeZURIK products.

DeZURIK also offers customized training programs and consultation services. For more information, contact

your local DeZURIK sales representative or visit our website at www.dezurik.com.

DeZURIK 
Cylinder Actuator for Knife Gate Valves 
February 2022 Page 3 D11040 
 
Table of Contents 
Table of Contents .................................................................................................................................................3 
Description............................................................................................................................................................4 
Lubrication............................................................................................................................................................4 
Adjustments..........................................................................................................................................................4 
Aligning the Cylinder .........................................................................................................................................4 
Valve Support....................................................................................................................................................4 
Cylinder Stroke Adjustment...............................................................................................................................5 
Drawing.................................................................................................................................................................6 
Cartridge Rebuild..................................................................................................................................................7 
Disassembling the Cartridge.................................................................................................................................7 
Reassembling the Cartridge.................................................................................................................................7 
Cartridge Assembly Replacement ........................................................................................................................8 
Disassembling the Cylinder ..................................................................................................................................9 
Reassembling the Cylinder.................................................................................................................................10 
Troubleshooting..................................................................................................................................................11 
 
 

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

DeZURIK

Cylinder Actuator for Knife Gate Valves

February 2022 Page 5 D11040

Cylinder Stroke Adjustment

The adjusting set screw (C21) in the cylinder acts as the cylinder stroke adjustment. Adjust this

adjusting screw (C21) so that the actuator does not pull the gate off the seat ring when the valve is fully

opened.

To adjust the closed position:

1. Close the valve.

2. Turn the clip into the piston rod (C14) until the cylinder has a minimum of 1/16” stroke remaining and

tighten jam nut.

3. Open the valve and adjust the adjusting screw (C21) until the gate is clear of the flow port but fully on

the seat ring. Tighten Jam nut (C22).

DeZURIK

Cylinder Actuator for Knife Gate Valves

February 2022 Page 6 D11040

Drawing

Figure 2: Component Identification

DeZURIK

Cylinder Actuator for Knife Gate Valves

February 2022 Page 7 D11040

Cartridge Rebuild

To repair a cylinder actuator with the rod seal and wiper damaged by outside contaminants on the piston rod

(C14) during the retracting stroke.

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.

See Figure 3. The Rod Seal (C15C) and Wiper (C15B) are installed in the Cartridge (C15), along with an O-

ring (C15D).

Disassembling the Cartridge

1. Shut off the air supply

2. Remove the Cylinder Cartridge (C15) by unscrewing it from the Cylinder Head (C16) with a spanner

wrench.

3. Once Cylinder Cartridge (C15) is threaded free from the Cylinder Head (C16), slide Cylinder Cartridge

(C15) all the way down the Piston Rod (C14) and off.

4. Remove the Wiper (C15B), Rod Seal (C15C) and O-ring (C15D) from the Cylinder Cartridge (C15A).

Reassembling the Cartridge

1. Clean the Cylinder Cartridge (C15) grooves and lubricate with Dow Corning Number 44 lubricant, or

Dow Corning Number 55 in cylinders for –40°C to –50°C service.

2. Insert the Rod Seal (C15C) into its groove, making sure it lies flat in the groove. Insert the PTFE

backing rings as shown in Figure 3. NOTE: The backing rings are cut with a bevel; make sure the

beveled ends of the rings ends meet but do not overlap.

3. Insert Wiper (C15B) into its groove.

4. Place O-ring (C15D) into its outer groove.

5. Carefully slide assembled Cylinder Cartridge (C15), in proper orientation, onto Piston Rod (C14) and

screw Cylinder Cartridge (C15) into the Cylinder Head (C16).

6. Mount cylinder onto valve and perform cylinder stroke adjustment as needed.

DeZURIK

Cylinder Actuator for Knife Gate Valves

February 2022 Page 8 D11040

Cartridge Assembly Replacement

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. To replace the Cylinder Cartridge (C15) assembly shut off the air supply.

2. Remove the Cylinder Cartridge (C15) by unscrewing it from the Cylinder Head (C16) with a spanner

wrench.

3. Once Cylinder Cartridge (C15) is threaded free from the Cylinder Head (C16), slide Cylinder Cartridge

(C15) all the way down the Piston Rod (C14) and off.

4. Replace it with a new Cylinder Cartridge (C15).

Figure 3: Cartridge Assembly (C15)

WIPER (C15B)

CARTRIDGE (C15A)

O-RING (C15D)

ROD SEAL (C15C)

WITH PTFE

BACKING RINGS

PTFE BACKING

RINGS

PART OF ROD

SEAL (C15C)

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

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

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