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Danfoss PCV-VFQ 21, Instructions Manual

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Danfoss PCV-VFQ 21 Instructions Manual Download Page 16

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VI.JA.G2.02  

©  Danfoss  11/2006

 

DH-SMT/SI 

Instructions 

Pilot-controlled PCVQ DN 100  - DN 250 (PN 16, PN 25)

9.2  Replacement of Trim Valve VFQ 21

The trim can be replaced by qualified personnel 

up to DN 125. From DN 150 replacement should 

be carried out by the Danfoss service personnel. 

Removing the trim: 

Valves DN 100–125

1. Dismount actuator 

1

  

(see section 9.1). 

2. Unscrew hexagon head cap screw 

2

. 

3. Remove bonnet 

3

. 

4. Take out trim 

4

. 

Prior to installation:

 

Clean sealing surfaces 5 and socket 6, grease 

sealing surfaces with antiseize graphite 

petroleum. 

Installing the trim

: 

Mounitng is carried out in reverse order. 

Torque hexagon head cap screws 

2

:

DN

Torque

Wrench

100 - 125

180 Nm

SW 30

9 

Replacement of Valve, 

Actuator, Trims 

Summary of Contents for PCV-VFQ 21

Page 1: ...be Installation 4 6 5 Insulation 4 6 6 Installation Scheme 5 6 7 Assembly Drawings Dimensions 6 7 Start up 8 7 1 Required static Pressure 8 7 2 Leak and Pressure Test 8 7 3 Filling the System 8 7 4 Start up 8 7 5 Putting out of Operation 8 7 6 Flow Rate Adjustment 9 7 7 Flow Adjusting Curves 10 7 8 Sealing 12 7 9 Adjustement of the Throttle Valves 12 7 10 Function Test 12 8 Trouble Shooting 13 9 R...

Page 2: ...lates determine the use 3 Description 3 2 Mode of Operation The control unit consists of the PCV VFQ21 valve unit installed in the main pipe and AVP F installed as pilot controllers in the bypass In the bypass line a throttle element is installed in front of the pilot controller The controller keeps the differential pressure across the main valve flow restrictor on a constant level and restricts the...

Page 3: ...ating plates and the PCV data sheet 5 Scope of Delivery DN 100 DN 125 Assembly kit valve unit PCV VFQ 21 Pilot controller DN 25 AVP F Throttling element Cu pipe Ø 6 1 1500 mm Cu pipe Ø 10 1 3000 mm DN 150 DN 250 Assembly kit valve unit PCV VFQ 21 Pilot controller DN 40 AVP F Throttling element Cu pipe Ø 6 1 1500 mm Cu pipe Ø 10 1 3000 mm ...

Page 4: ...ce Installation is only permitted in horizontal pipelines with the actuators hanging in a downward position The controller may be installed in the supply as well as in the return line 6 3 When installing Observe direction of flow Design with welded ends Loads on the valve body and the throttle element by the pipes are not permitted 6 4 Impulse Tube Installation See installation scheme section 6 6 F...

Page 5: ...uring mounting Bypasscontroller PCVQ Throttling element Throttling valve Throttling valve only by DN 150 250 Valve unit PCV VFQ 21 Pilot controller AVP F DH SMT SI VI JA G2 02 Danfoss 11 2006 5 Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 6 6 Installation Scheme Installation in the Return Line Installation in the Supply Line 6 Assembly ...

Page 6: ...000 A 159 75 L1 DN 25 pipe Ø33 7 3 2 Material ST 35 8 not part of the delivery DN 25 SW 50 Pilot controller AVP F Throttling element 6 VI JA G2 02 Danfoss 11 2006 DH SMT SI Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 6 Assembly 6 7 Assembly Drawings Dimensions DN 100 DN 125 ...

Page 7: ... 35 8 not part of the delivery DH SMT SI VI JA G2 02 Danfoss 11 2006 7 Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 6 Assembly continuous DN 150 DN 250 Nominal diameter DN 100 125 150 200 250 L1 mm 350 400 480 600 730 H1 530 530 619 647 697 H2 245 300 325 D2 263 380 D1 250 320 385 500 B 200 210 310 336 412 A 290 320 350 410 ...

Page 8: ...or higher pressures you must Remove the impulse tubes 3 at the actuator and close the connections with a stopper Prior to any leak or pressure test the instructions in section 7 3 must be complied with 1 Pre condition Same pressure on both sides of the diaphragm If the pressure load is one sided the diaphragm chamber may have an excess pressure of 1 bar in comparison to the diaphragm chamber To av...

Page 9: ...umber of rotations to the left 1 Unscrew cover 1 2 Loosen the counter nut 2 3 Choose diagram see section 7 7 Flow Adjusting Curves Observe effecitve pressure Δpb 0 2 or 0 5 bar see rating plate on the actuator AVP F 5 The adjusted flow rate can be verified by means of a flow rate measuring device Perhaps you need to re adjust the flow rate Care for an adequate differential pressure in the system 6 Tight...

Page 10: ...N 200 kvs 450 DN 250 kvs 630 0 20 40 60 80 100 120 140 160 180 200 0 1 2 3 4 5 6 7 8 9 10 DN 200 DN 250 pb 0 2 necessary rotations of the adjustingthrottle 4 Example Ventil DN 200 required flow rate limitation 100m h Rotations for the adjusting throttle F low rate m 3 h DN 200 kvs 450 DN 250 kvs 630 0 20 40 60 80 100 120 140 160 180 200 220 240 260 0 1 2 3 4 5 6 7 8 9 DN 200 DN 250 pb 0 5 Rotations...

Page 11: ...ly opened so that the flow rate is not restricted by a unit The adjustment can also be carried out via a bypass 3 5 Adjust the flow rate limitation by turning the adjusting throttle 6 Turning to the right 7 reduces the flow rate 3 Unscrew cap nut 4 4 Loosen the counter nut 5 Turning to the left 8 increases the flow rate 6 Observe the flow rate indicator 7 After having completed the adjustment tighten t...

Page 12: ... turning it to the right by means of a wrench SW5 to its stop Then unscrew valve spindle by turning it to the left by approx 10 rotations Increase of damping e g necessary in case of pressure vibrations Screw in the valve spindle by turning it to the right Reduction of damping e g in case of a control that is too slug Unscrew the valve spindle by turning it to the left 7 10 Function Test Flow rate...

Page 13: ...ge Flow rate is too low Valve plug of the pilot valve AVP F does not open Valve seat or plug is dirty or damaged trim is dirty 1 Remove impulse tube 2 Dismount actuator and trim Procedure see section 9 4 3 Clean seat and plug 4 If damaged replace trim or valve Valve plug of the pilot valve VFQ 21 does not open Valve seat or plug is dirty or damaged trim is dirty 1 Remove impulse tube 2 Dismount ac...

Page 14: ... of the actuator 4 are not screwed to eachother Dismounting 1 Dismount impulse tubes 2 Support actuator below or by a second person as the springs 1 are pre stressed 3 Loosen union nut 2 4 Remove actuator Prior to assembly check cone 5 1 Clean cone prior to mounting 2 Check O rings for damages in case of damages replace cone see Spare Parts 3 Grease cone with high performance fitting component BARR...

Page 15: ...re stressed Secure against dropping down before unscrewing 3 Screw the stem of the actuators 4 out of the valve stem 3 by turning the actuator to the left Mounting 1 Place actuator at the valve and push upward to press the spring package in the actuator together second person necessary 2 Carefully turn actuator to the right By this carefully screw in the stem of the actuator into the valve stem to...

Page 16: ...the Danfoss service personnel Removing the trim Valves DN 100 125 1 Dismount actuator 1 see section 9 1 2 Unscrew hexagon head cap screw 2 3 Remove bonnet 3 4 Take out trim 4 Prior to installation Clean sealing surfaces 5 and socket 6 grease sealing surfaces with antiseize graphite petroleum Installing the trim Mounitng is carried out in reverse order Torque hexagon head cap screws 2 DN Torque Wre...

Page 17: ...nting 1 Place actuator at the valve and align observe position of the impulse tube connections 2 Screw on union nut 1 and tighten torque 100 Nm AVP F DN 25 AVP F DN 40 Dismounting 1 Unscrew actuator see above 2 Unscrew trim 2 DN 25 with pipe tongs wrap gum strips around the trim DN 40 with wrench SW 55 3 Pull out trim Mounting Mounting is carried out in reverse order Only tighten with low torque s...

Page 18: ...18 VI JA G2 02 Danfoss 11 2006 DH SMT SI Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 ...

Page 19: ...DH SMT SI VI JA G2 02 Danfoss 11 2006 19 Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 ...

Page 20: ...20 VI JA G2 02 Danfoss 11 2006 DH SMT SI Instructions Pilot controlled PCVQ DN 100 DN 250 PN 16 PN 25 ...

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