Instructions
Pilot-controlled PCVQ
DN 100 - DN 250 PN 16 / PN 25
Table of Contents
1 |
Safety Notes ....................................................... |
2 |
2 |
Definition of Application ............................. |
2 |
3 |
Description.......................................................... |
3 |
3.1 |
Construction......................................................... |
3 |
3.2 |
Mode of Operation ............................................ |
3 |
4 |
Technical Data ................................................... |
4 |
5 |
Scope of Delivery.............................................. |
4 |
6 |
Assembly .............................................................. |
5 |
6.1 |
Prior to Assembly ............................................... |
5 |
6.2Installation Position,
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Installation Place ................................................. |
5 |
6.3 |
When Installaling observe .............................. |
5 |
6.4 |
Impulse Tube Installation................................. |
5 |
6.5 |
Insulation ............................................................... |
5 |
6.6 |
Installation Scheme............................................ |
6 |
6.7 |
Assembly Drawings, Dimensions ................. |
7 |
7 |
Start-up................................................................... |
9 |
7.1 |
Required static Pressure .................................. |
9 |
7.2 |
Leak and Pressure Test...................................... |
9 |
7.3 |
Filling the System................................................ |
9 |
7.4 |
Start-up................................................................... |
9 |
7.5 |
Putting out of Operation.................................. |
9 |
7.6 |
Flow Rate Adjustment....................................... |
9 |
7.7 |
Flow Adjusting Curves .................................... |
11 |
7.8 |
Sealing .................................................................. |
13 |
7.9 |
Adjustement of the Throttle Valves .......... |
13 |
7.10 |
Function Test ..................................................... |
13 |
8 |
Trouble Shooting .......................................... |
14 |
9 |
Replacement of Valve, |
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Actuator, Trims ............................................... |
15 |
9.1Dismounting and
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Mounting Actuator Valve .............................. |
15 |
9.2 |
Replacement of Trim Valve VFQ 21 ............ |
17 |
9.3 |
Dismounting, |
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|
Mounting Actuator AVP-F ............................. |
18 |
9.4 |
Replacement of Trim Valve AVP-F............... |
18 |
© Danfoss | 2016.05 |
VI.JA.G3.02 | 1 |
Instructions |
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25) |
1 |
Safety Notes |
Prior to assembly and |
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commissioning to avoid injury |
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of persons and damages of the |
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devices, it is absolutely |
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necessary to carefully read and |
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observe these instructions. |
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Necessary assembly, start-up, and maintenance |
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work must be performed only by qualified, |
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trained and authorized personnel. |
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Prior to assembly and maintenance work on the |
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controller, the system must be: |
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depressurized, |
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cooled down, |
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emptied and |
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cleaned. |
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Please comply with the instructions of the |
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system manufacturer or system operator. |
MAINTENANCE
FREE
2 |
Definition of |
The controller is used for flow rate limitation of |
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Application |
water for heating, district heating and cooling |
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systems. |
The admissible medium temperatures depend on the design and comprise 5 to 150 °C,
5 to 200 °C.
The technical data on the rating plates determine the use.
2 | © Danfoss | 2016.05 |
VI.JA.G3.02 |
Instructions |
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25) |
3 |
Description |
3.1 Construction |
Pilot controller AVP-F |
Adjusting throttle |
(Flow Rate) |
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Throttling element DE |
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Valve unit PCV-VFQ 21 |
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Throttling valve |
Throttling valve |
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only by DN150-250 |
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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 flow rate to the adjusted setpoints.
The valve and the pilot valves are pressurebalanced.
The setpoint for the flow rate limitation is adjusted at the adjusting throttle of the valve unit.
The valve unit in the main pipe is opening on rising pressure. The pilot controller in the bypass line is closing on rising pressure.
Flow Rate Limitation
If the flow rate reaches the adjusted setpoint, the differential pressure increases at the adjusting throttle. This differential pressure acts on the actuator AVP-F via the impulse tubes and the valve AVP-F closes. Consequently, the valve of the valve unit is throttled, too, and the flow rate is restricted.
4 |
Technical Data |
Technical data, see rating plates and the PCV |
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data sheet. |
VI.JA.G3.02 |
© Danfoss | 2016.05 | 3 |
Instructions |
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25) |
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
4 | © Danfoss | 2016.05 |
VI.JA.G3.02 |
Instructions |
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25) |
6 |
Assembly |
6.1 Prior to Assembly: |
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Depressurized system before any assembly work !
CAUTION!
•Clean pipeline system.
•Install strainer in front of the controller.
•Install shut-off units in front of and behind the controller.
6.2 Installation Position, Installation Place
•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:
pin only
weld
do NOT weld
6.4 Impulse Tube Installation
See installation scheme, section 6.6.
For CU pipes Ø 10 × 1, insert sockets 1 on both sides.
1
Care for correct position of the cutting rings 2.
2
6.5 Insulation
The diaphragm actuators must not be insulated when insulating system parts.
•Loads on the valve body and the throttle element by the pipes are not permitted.
VI.JA.G3.02 |
© Danfoss | 2016.05 | 5 |
Instructions |
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25) |
6 Assembly |
6.6 |
Installation Scheme |
Installation in the Return Line
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Throttling valve |
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Throttling |
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element |
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Throttling valve |
Valve unit PCV - VFQ 21 |
(only by DN 150 - 250) |
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Bypass controller |
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PCVQ |
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Pilot controller AVP-F |
Installation in the Supply Line
Valve unit PCV - VFQ 21 |
Throttling valve |
Throttling |
element |
Throttling valve |
(only by DN 150 - 250) |
Bypass controller |
PCVQ |
Pilotregler AVP-F |
lay impulse tube during mounting |
6 | © Danfoss | 2016.05 |
VI.JA.G3.02 |
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