DeZurik PEC Manuale utente

DeZURIK 20.5–36" PEC

ECCENTRIC VALVES

Instruction D10032

April 2015

DeZURIK

20.5 - 36" PEC Eccentric Valves

Instructions

These instructions provide information about PEC Eccentric Valves. They are for use by personnel who

are responsible for installation, operation and maintenance of PEC Eccentric Valves.

Safety Messages

All safety messages in the instructions are flagged with an exclamation symbol and the word Caution,

Warning or Danger. These messages indicate procedures that 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 read, or

if a label has been removed, please contact DeZURIK for replacement label(s).

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

alert to potential emission of pipeline material and take appropriate safety precautions.

Always wear suitable protection when dealing with hazardous pipeline materials. Handle

valves, which have been removed from service with suitable protection for any potential

pipeline material in the valve.

Inspection

Your PEC Eccentric Valve has been packaged to provide protection during shipment, however, it can

be damaged in transport. 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 local 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

20.5 – 36" PEC Eccentric Valves

April 2015 Page 3 D10032

Table of Contents

Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Handling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Required Tools - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Fusion/Powder Coated Valves - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

Closed Position - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

Lubrication

Packing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

Plug Journals and Lubrication - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

Packing Adjustment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Replacing Packing with Actuator Removed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Replacing Packing Without Removing Actuator - - - - - - - - - - - - - - - - - - - - - - - - - - 9

Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

Reassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Removing Valve from Pipeline - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Field Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Emergency Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Predicted Wear of Parts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

DeZURIK

20.5 - 36" PEC Eccentric Valves

D10032 Page 4April 2015

Description

The 20.5 – 36” PEC Eccentric Valves have welded nickel seats that provide excellent resistance to

corrosion and damage, and prolong the life of the resilient plug facing. The valve rotates 90 degrees

from full open to full closed. Clockwise rotation of the valve stem closes the valve.

If an actuator other than a DeZURIK is to be mounted, the actuator must be capable of maintaining the

valve plug position with flow in the pipeline.

This valve is a pressure vessel. Failure to release pipeline pressure may result in

personal injury and/or flow system damage. Completely release pipeline pressure before

removing the actuator from the valve or removing the valve from the pipeline.

Handling

Lifting the valve improperly may damage it. Do not fasten lifting devices to the actuator, plug or through

the seat opening in the body. Lift the valve with slings, chains or cables fastened around the valve

body, or fastened to bolts or rods through bolt holes in the flanges.

Required Tools

This valve is assembled using only SAE fasteners. To service this valve, you should have a full set of

combination wrenches, Allen wrenches, a large flat tipped screwdriver, a flat pry bar, a pin punch and a

dead blow hammer.

Installation

The type of materials carried in the pipeline and the location of the valve determine the correct

installation procedure.

Liquids and Gases

1. Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from the

valve and pipeline.

2. Install the valve as shown in Figure 1.

Figure 1—Liquids and Gases

3. Ensure the valve and flanges are concentric to ensure proper flange sealing.

4. Tighten the flange bolts or studs in a crisscross pattern.

DeZURIK

20.5 – 36" PEC Eccentric Valves

April 2015 Page 5 D10032

Installation (continued)

Suspended Solids

If the pipeline carries suspended solids such as paper stock of 2 percent or higher consistency, mining

slurry, or raw sewage:

1. Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from the

valve and pipeline.

2. Install the valve as shown in Figure 2.

a. In HORIZONTAL pipelines, install the valve so that the plug is horizontal and rotates

upward as the valve opens.

b. For VERTICAL pipelines, install the valve with the end marked “SEAT” at top of valve.

Figure 2—Liquids with Suspended Solids

3. Tighten the flange bolts or studs in a crisscross pattern.

4. Ensure the valve and flanges are concentric to ensure proper flange sealing.

Fusion/Powder Coated Valves

Valves with fusion/powder coated exterior paint require flat washers to be installed

under the flange nuts when installing the valve to the pipeline flange to prevent the

paint from cracking or chipping.

NOTE: In the case of limited space where both the

recommended seat orientation shown and the

recommended plug orientation described in 2a above, are

not possible, the recommended plug position shall

always take precedence.

For Pump Isolation Service, install the discharge valve

with the seat toward the pump and with the plug rotating to

the top of the pipeline in the open position. On the suction

side, install the valve with the seat toward the pump.

DeZURIK

20.5 - 36" PEC Eccentric Valves

D10032 Page 6April 2015

Closed Position

Because of the eccentric action of this valve, the closed position of the valve is dependent upon the

pressure drop expected when the valve is closed.

To adjust the valve closed position, follow these steps:

1. Relieve pipeline pressure.

Moving parts from accidental operation of power actuator can cause personal injury or

equipment damage. Disconnect and lock out power to actuator before servicing.

2. If the actuator is powered, disconnect and lock out the pneumatic, hydraulic, or electrical power

to prevent accidental operation of the actuator.

3. Back off the actuator closed position stop as described in the Actuator Instructions.

4. Close the valve with the torque specified in the Actuator Instructions.

Note: This torque is the amount required to seat the plug for a given pressure drop across the valve. To

avoid excessive plug and seat wear caused by over torquing, use the actual pressure drop across the

valve when determining correct closing torque.

5. After the valve has been closed using the correct amount of torque, set the actuator closed

position stop to limit actuator travel at this position.

Lubrication

This valve does not require routine maintenance lubrication. If the valve is disassembled, lubricate the

packing and the plug journals as follows:

Packing

Packing lubrication requirements are dependent upon the packing material.

•PTFE PACKING:

Requires no lubrication.

•ALL PACKING OTHER THAN PTFE:

Apply a light coat to the inside and outside diameters of the packing rings using one of these

lubricants.

- Lubriplate Clearplex-2 (recommended)

- Amoco FG (alternate)

- Mobilgrease FM 101 (alternate)

- Petro-Canada Purity FG 2 (alternate)

- Phillips Philube PF (alternate)

Note: Ensure lubricant is compatible with flow media.

DeZURIK

20.5 – 36" PEC Eccentric Valves

April 2015 Page 7 D10032

Lubrication (continued)

Plug Journals and Lubrication

Plug journal lubrication is dependent upon the materials used in construction of the valve.

•CAST IRON, DUCTILE IRON and NI-RESIST VALVES: Lubricate the journals on the plug using one of

these lubricants.

- Lubriplate Clearplex-2 (recommended)

- Amoco FG (alternate)

- Mobilgrease FM 101 (alternate)

- Petro-Canada Purity FG 2 (alternate)

- Phillips Philube PF (alternate)

•ALL VALVES EXCEPT CAST IRON, DUCTILE IRONand NI-RESIST: Coat the journals on the plug with

a light coat using one of these lubricants.

- Dow Corning Molykote G Rapid paste (recommended)

- Shell Retinax AM (alternate)

- Shell Lithall MDS (alternate)

Then lubricate with a mixture of powdered graphite and one of these lubricants.

- Standard Oil #140 Gear Lube (recommended)

- Mobil Mobilgear 634 (alternate)

- Shell Omala 460 (alternate)

- Texaco Meropa 460 (alternate)

- Amoco MP (alternate)

DeZURIK

20.5 - 36" PEC Eccentric Valves

D10032 Page 8April 2015

Packing Adjustment

To stop packing leakage, tighten the gland nuts uniformly until the leak stops.

Note: Do not continue tightening after leak stops. If the leak cannot be

stopped by tightening the gland nuts, replace the packing.

Packing Replacement

Replacing Packing with Actuator Removed

To replace the packing without removing actuator, see “Replacing Packing Without Removing Actuator”

section.

1. Discontinue pipeline flow and relieve pipeline pressure.

2. Scribe the actuator and valve bonnet for alignment when reassembling.

Moving parts from accidental operation of power actuator can cause personal injury

or equipment damage. Disconnect and lock out power to actuator before servicing.

3. If the actuator is powered, disconnect and lock out the pneumatic, hydraulic, or electrical power

to prevent accidental operation of the actuator.

When an eccentric valve is mounted in a vertical pipeline— or mounted in a horizontal

pipeline with the plug stem horizontal—gravity can cause the plug to swing to a lower

position in the valve body when the actuator is removed. Place the plug in the lowest

position before removing the actuator.

4. Remove the actuator from the valve. See Actuator Instructions.

5. Remove the actuator adaptor (when used) from the valve.

6. Remove the packing gland nuts, then slide the packing gland off the valve shaft.

7. Pull the packing out of the bonnet.

DeZURIK

20.5 – 36" PEC Eccentric Valves

April 2015 Page 9 D10032

Packing Replacement (continued)

8. Lubricate the new packing, then install it one ring at a time as shown in Figure 3.

Figure 3—Correct Packing Installation Sequence

9. Slide the packing gland down the valve shaft and over the studs.

10. Turn the packing gland nuts onto the studs finger tight plus ½ turn.

Note: This is a preliminary adjustment, it will be necessary to adjust the packing gland

nuts after the valve is pressurized. See "Packing Adjustment" section.

11. Install the actuator as described in the Actuator Instructions.

12. If the actuator is a powered actuator, reconnect power to the actuator.

Replacing Packing Without Removing Actuator

1. This process can be done with or without pressure in the pipeline.

Caustic, toxic, or hot material in the pipeline can cause personal injury or death if

leakage occurs. Confirm that the material is not harmful.

2. Ensure that the material in the pipeline will not cause injury if leakage occurs.

DeZURIK

20.5 - 36" PEC Eccentric Valves

D10032 Page 10 April 2015

Packing Replacement (continued)

3. Remove the packing gland nuts from the studs, and slide the packing gland up the stem of the

plug.

4. Remove the studs from the bonnet.

5. Cut and completely remove all of the old packing from the packing chamber in the bonnet.

6. Cut each new packing ring radially in one place with a razor-sharp knife.

7. Place each new packing ring—one at a time with the joints staggered—around the plug and into

position in the packing chamber.

8. Replace the studs in the bonnet.

9. Push the rings down into position with the packing gland, and replace the packing gland nuts on

the studs.

10. Turn the packing gland nuts onto the studs until they touch the packing gland, then one more

turn.

11. Restore the pipeline pressure if it was relieved, and check for packing leakage. If leakage

occurs, tighten each packing nut just enough to stop the leakage. Excessive tightening will

cause reduced packing life and higher valve operating torque.

Disassembly

This valve is a pressure vessel. The bonnet will blow off the body if the bonnet

bolts are removed with pressure in the valve. Pressure must be completely released

before disassembly.

Follow these steps to disassemble valve:

1. Relieve pipeline pressure and close the valve.

Moving parts from accidental operation of power actuator can cause personal injury

or equipment damage. Disconnect and lock out power to actuator before servicing.

2. If the actuator is powered, disconnect and lock out the pneumatic, hydraulic, or electrical power

to prevent accidental operation of the actuator.

3. If desired, remove the valve from the pipeline.

Note: The valve can be disassembled while still in the pipeline.

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