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Valtek FlowTop General Service Valve FCD VLENIM8610A4 11/18

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Defect

No.

Possible Causes

Remedy

Jerky stem movement

2.2

• Actuator not powerful enough

• Compare actuator specifications on the serial

plate with operation specifications of the facility. If

incompatible, contact customer service department

or contract partner

Stem travel less than full stroke

(0 to 100 %)

3.1

• Air supply pressure too low

• Provide air at the pressure stated on the serial plate

(European production only).

3.2

• Pneumatic actuators:

Improper handwheel position

• Move handwheel to limit position , otherwise

contact factory for information.

3.3

• Improperly adjusted or defective

positioner

• Readjust positioner to positioner manufacturer‘s

specification

3.4

• Foreign particles in valve seat or

damaged trim

• Contact customer service department or contract

partner

Excessive valve seat leakage

4.1

• Damaged sealing surfaces on

valve seat or plug

• Contact customer service department or contract

partner

4.2

• Foreign particles in seat area

• Contact customer service department or contract

partner

4.3

• Plug does not close fully

• Refer to No. 3.1 to 3.5

Leaking packing box system

5.1

• Compression force on packing box

too low

• Slightly retighten packing box

NOTICE

Make sure stem can still move.

5.2

• Worn packing

• Slightly retighten packing box

NOTICE

Make sure stem can still move.

If the packing does not stop leaking, contact

customer service department or contract partner

5.3

• Dirty stem

• Clean stem with suitable cleaning agent

5.4

• Damaged stem

• Contact customer service department or contract

partner

Leaking bonnet gasket

6.1

• Gasket compression is too low

• Properly retighten bonnet bolting nuts crosswise

6.2

• Gasket defective

• Contact customer service department or contract

partner

6.3

• Corrosion

• Contact customer service department or contract

partner

Leaking body

7.1

• Corrosion or high velocity related

damage

• Contact customer service department or contract

partner

No limit switch signal

8.1

• Power supply to limit switch

interrupted

• Check power supply

(connections, circuit breakers, voltage)

8.2

• Limit switch out of adjustment

• Readjust limit switch operating distance; see limit

switch data sheet

Unstable positioner

9.1

• Defective positioner

• See user instruction of the positioner manufacturer

Table 8: Trouble-shooting

Содержание Valtek FlowTop V746

Страница 1: ...ER INSTRUCTIONS Valtek FlowTop General Service Control Valve Type V746 and V748 FCD VLENIM8610A4 11 18 Experience in Motion This document is the Original Instructions Installation Operation Maintenanc...

Страница 2: ...lation options It is required that only trained and qualified technicians are authorized to adjust repair or work on control valves actuators positioners and other accessories Review this bulletin pri...

Страница 3: ...d for use in MODERATE and WORLDWIDE environmental conditions ambient tempera ture range 40 F to 180 F 40 C to 82 C air humidity up to 93 non condensing air pollution up to 300 g m3 unless restricted b...

Страница 4: ...paper Shipping marks display product and package dimensions and weight for further information see Packaging and Sending Instructions Form L 002 Packing guidelines for export follow HPE standards Non...

Страница 5: ...perational data of the facility An operational mismatch can cause considerable damage to the valve or may lead to a failure at the facility 2 Confirm that the line is clear of dirt welding slag chips...

Страница 6: ...changes to operating conditions that may damage the control valve 10 Confirm that the air supply and instrument signal lines are dry and clear of dirt and oil At a minimum the instrument air must con...

Страница 7: ...ise or vibration levels might occur Impermissible continuous operation of a control valves under critical conditions can damage the valve 2 Avoid frequent system start ups and shutdowns Critical opera...

Страница 8: ...tion Clean actuator stem with a soft cloth Overhaul or replace actuator after prod uct lifecycle 5 Preventive overhaul of the valve Dependent upon results of previous maintenance see numbers 1 to 4 ab...

Страница 9: ...e risk of malfunction and safety related incidents No Check Possible malfunction or safety related incident 1 Check the packing follower for proper tightness The packing follower is spring loaded and...

Страница 10: ...nd bonnet compo nents If nominal and actual values differ by more than 5 maintenance may be required 12 Troubleshooting Contact customer service department or contract partner for any fault or defect...

Страница 11: ...nt or contract partner 4 3 Plug does not close fully Refer to No 3 1 to 3 5 Leaking packing box system 5 1 Compression force on packing box too low Slightly retighten packing box NOTICE Make sure stem...

Страница 12: ...l from the pipe and cleaning Permissible exposure limits must be maintained appropriate personal protective equip ment must be used and service personnel must be properly instructed in performing the...

Страница 13: ...ely 8 Place the valve body assembly on a table for disas sembly Disassembly instructions of the valve body assembly 1 Turn the lock nut 113 counter clockwise to loosen 2 Turn the packing follower 80 c...

Страница 14: ...12 Check stressed surface areas for damage such as scoring and deformities 13 Use a standard brass scraper or other suitable tool to clean bolting Check for corrosion or any other damage Reassembly in...

Страница 15: ...lace the pneumatic diaphragm actuator and acces sories See page 13 26 After reinstalling the control valve in the pipeline perform 3 full strokes and check the tightening of the packing follower and b...

Страница 16: ...assembling each type of Bellows Seal Assembly Type A Bellows Seal Assembly Lower the plug 50 into a three jaw chuck with soft brackets and turn the plug from the stem and bonnet 51 5 counter clockwise...

Страница 17: ...plug Type A and B NOTICE The cone of the lock bushing must open to the top Reassembling Type A bellows Carefully lower the bonnet 5 onto the plug Install a new head gasket 59 and insert the bellows se...

Страница 18: ...eat ring 20 Install the new seat retainer gasket 56 and the new bonnet gasket 58 21 Lower the plug assembly 50 into the body and place it into the seat ring 22 Install and finger tighten the bonnet nu...

Страница 19: ...ator coupling 249 lines up NOTICE Press the stem plug into the seat by hand 5 Move the actuator to the close position and install the cap screws 240 6 Secure the lock nut 113 Keep actuator coupling 24...

Страница 20: ...8 1 V746 is designed for Class 150 while V748 is desigend for Class 300 Presssure Class Torque Requirements for HEAD NUTs 110 per nominal diameter 1 2 3 4 1 1 1 2 2 3 4 6 Class 150 Nm 13 14 30 24 Clas...

Страница 21: ...nfluence The operator must observe national and international environmental conditions for control valve removal from the pipeline and cleaning Permis sible limit values must be maintained to ensure s...

Страница 22: ...8 Bonnet gasket 316SS Gaphite Layer 59 Head gasket Pure Graphite 60 Profile ring Pure Graphite 65 O ring 1 Buna N Viton EPDM Kalrez or Chemraz 66 Backup ring 1 PTFE or PEEK 76 Yoke lock nut 2 316SS 80...

Страница 23: ...610A4 11 18 23 flowserve com Figure 17 Complete valve parts 138 88 93 87 80 40 110 42 48 59 106 5 104 91 60 51 52 56 30 20 55 1 108 114 50 51 40 66 65 66 58 50 CavStream 30 MegaStream Standard Extende...

Страница 24: ...wserve products should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial service conditions Although Flowserve can and often does provide gener...

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