Danfoss PCVQ Data sheet

Data sheet

Pilot-controlled differential pressure and flow
controller (PN 16, 25, 40)
PCVPQ - flow and return mounting, adjustable setting

Description

Pilot-controlled flow and differential pressure
controller is a self-acting differential pressure
controller primarily for use in district heating,
district cooling or in industrial systems as well. It
can be flow and return mounted in applications
with and without heat exchanger like large
substations and distribution stations.

The control function of the PCVPQ controller
is defined by the control function of the pilot
controller. Setting of flow is done on main
controler , setting of differential pressure is done
on the pilot controller.

Throttle valve data can be found on page 8.

Main data1) :

• DN 50-250

• kVS 32-630 m3/h

• PN 16, 25, 40

2)

3)

• Temperature:

- Circulation water/glycolic water up to 30%:
2 … 150°C

• Connections:

- Pilot controller:
ext. thread (weld-on tailpieces) or flange

- Main valve: flange

1)

for details see Technica l data and Ordering sections

2)

smaller DN on re quest

3)

PN 40 on special re quest

Features:

- Differential pressure and flow controller

- Extremely high control ratio (see Tab.1) as a
result of low pilot controller min. flow rate
(kVS value) and high flow rate (kVS) of the main
valve

- Small overall dimensions comparing to
standard design (especially height)

- Higher valve capacities for DN 150-250
comparing to standard design

- High control stability

- Smooth operation flow controller

- Water/glycolic water applications

Tab. 1

DN Min. control rat io

50 100 : 1

65 140 : 1

80 220 : 1

100 300 : 1

125 400 : 1

150 400 : 1

200 550 : 1

250 750 : 1

© Danfoss | 2021.02 AI179486466874en-010303 | 1

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Technical Data Main valve

Nominal diameter DN 50 65 80 100 125 15 0 200 250

kVS value m3/h 32 50 80 125 160 320 450 630

Cavitation factor z 0.5 0.5 0.45 0.4 0.35 0.3 0.2 0.2

1)

Stainless steel M . No. 1.4571

2)

EPDM

Leakage acc. to standard IEC 534 ≤ 0.05% of k

Nominal pressure PN 16, 25, 40

Max. differential
pressure

Min. differential pressure 0.5

PN 16

PN 25/40 20

bar

16

Min. static pressure 1.5

Media Circulation water/glycolic water up to 30%

Media pH Min. 7, max. 10

Media temperature °C 2 … 150

Connections

Weight

Main controller Flange

Pilot controller Ext. thread (weld-on tailpieces) and flange Flange

PN 16

PN 25/40 31 34 63 72 147 264 347

kg 18.5

28.5 31 61 71 12 0 193 337

Materials

PN 16 Grey cast iron EN-GJL-250 (GG-25)

Valve body

PN 25

Ductile cast iron

EN-GJS-400-18-LT (GGG-40.3)

PN 40 Cast steel EN-GP-240-GH (GS- C 25) 2)

Valve seat Stainless steel M. No. 1.4021 Stainless steel M. No. 1.4313

Valve cone VFQ 21 Stainless steel M. No. 1.4404 Stainless steel M. No. 1.4021

Sealing VFQ 21 EPDM

Pressure relieve system Bellows

1)

VS

15 12 10

Cast steel EN-GP-240-GH

(GS-C 25)

Diaphragm2) (T

Bellows1) (T

max

150 °C )

max

300 °C)

1)

Defined by pilot controller

Main actuator

For main va lve DN 50 - 125 150 - 250

Actuator size cm

Max. operational pressure

Flow restrictor differential
pressure p

Diff. pressure setting ranges

1)

b

1)

Weight kg 11 24

Materials

Housing Stainless steel M. No. 1.0338

Control diaphragm EPDM

Impulse tube Stainless steel tube Ø10 × 0.8 mm

Number of throttle valves
(mounted on impulse tubes)

bar

2

250 630

25 16, 2 5

0.2/0.5

0.2-1.0 / 0.3-2.0 / 1-5 / 3-12

1 2

Trottling element

For main va lve DN 50 - 125 150 -250

Size of throttling element DN 25 40

Connections Welded end Flange

Max. operational pressure bar 25, 40

Weight kg 3.2 6.6

Materials

Body material Red bronze, M. No. 2.1090

Impulse tube Stainless steel tube Ø10 × 0.8 mm

2 | AI179486466874en-010303 © Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Ordering

Example 1:
Pilot-controlled flow and
differential pressure controller; flow
80 m3/h;
∆p 0.8 bar; PN 16; flow restrictor
Δpb 0.5 bar; T

- 1× PCV-VFQ 21 DN 100
Code No.: 00 3G1533

- 1× Pilot controller AVP DN 25
PN16 0.2 - 1.0 bar

Code No.: 00 3H6319

- 1× Pilot controller AVP-F 0. 5

Code No.: 00 3H6341

- 1× Mounting set for Impulse
tube Code No.: 0 03G159 9

max

150 °C

DN 50-125
PCV-VFQ 21 - Main controller, throttling element, throttle valve, impulse tubes

Flow range (m3/h)

max

∆pb 0.2 bar ∆pb 0.5 bar

0. 8-16 1.2-24 003G16 27

0. 8-16 1.2-24 003G 6710

6-63 9-90

DN 25

DN

k

(mm)

VS

(m3/h)

T

max

PN Connection

(°C)

Δp

(bar)

50 32

65 50 3-28 4-40 003G 6895

80 80 4-40 6-58 003G6898

16

100 125 6-63 9-90 00 3G1533

125 160 8-80 12-120 0 03G1534

50 32

65 50 3-28 4-40 003G 6878

80 80 4-40 6-58 0 03G157 8

150

Flange EN 1092-2 15

25

100 125 6-63 9-90 003G1543

125 160 8-80 12-120 0 03G154 4

100 125

125 160 8-80 12-120

Impulse tube

40

Copper

Stainless steel

Ø 6 × 1 × 3000 mm

Ø 10 × 1 × 1500 mm

Ø 10 × 0.8 × 1500 mm

AVP Pilot controller for differential pressure control - PN 25

DN

k

(mm)

VS

(m3/h)

T

max

PN Connection

(°C)

Δp setting range

(bar)

0. 2-1.0

25 8.0 150 25

Cylin dr.

ext. thread acc. to

ISO 228/1

G 1¼ A

0.3-2.0 003H6329

1-5

3-12

Weld-on tailpieces DN 25 003 H6910

Mounting set for impulse tube

2)

AVP- F Pilot controller for flow control - PN25

DN

k

T

VS

max

(mm)

(m3/h)

PN Connection

(°C)

Cylindr. ext.

25 8.0 150 25

thread acc. to

G 1¼ A

ISO 228/1

Weld-on tailpieces DN 25 003 H6910

Mounting set for impulse tube

2)

Δp

b

(bar)

0.2

0.5 003H6341

Δp

(bar)

Δp

(bar)

Code No.

1)

max

on request

Code No.

003 H6319

20

on request

003G1599

max

Code No.

20

003H6335

003G1599

Example 2:
Pilot-controlled flow and
differential pressure controller; flow
58 m3/h;
∆p 1 bar; PN 40; flow restrictor Δpb

0.2 bar; T

max

150 °C

- 1× PCV-VFQ 21 DN 100

Code No.: On request

- 2× Pilot controller
VFG 2 DN 25 PN40

Code No.: 06 5B2413

- 1× Pilot actuator AFP 0.15-1.5
Code No.: 003G1016

- 1× Pilot actuator AFPB- F 0.2
Code No.: 003G10 26

- 2× Mounting set for Impulse

tube Code No.: 0 03G1391

2)

Contains accessories fo r remounting

the impulse tub e on the pilot controller
from internal co nnection (factory
delivered) to e xternal connectio n.

3)

Actuator do es not have excess pressure

safety valve

VFG 2 Pilot controlers - PN40 (need to order 2 pcs)

DN

k

T

VS

max.

(mm)

25 8.0

(m3/h)

PN Connections Code No.

(°C)

150

40 Flanges acc. to EN 1092-1 065B 2413

(200)

AFP / AFP-9 Actuators for differential pressure control

Typ e

AFP-9

AFP

3)

∆p setting range

(bar)

1-6

0.5-3 0 03G1015

0.15 -1.5

0.1-0.7 00 3G1017

0.05-0.35 003 G1018

AFPB(-F) Actuators for flow control

∆p setting range

(bar)

0.2

0.5 003 G1027

for DN Code No.

15-125

00 3G1014

003 G1016

15-2 50

Max. operat. pressure Code No.

25

003 G1026

AI179486466874en-010303 | 3© Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Ordering (Continuous)

Example 3:
Pilot-controlled flow and
differential pressure controller; flow
260 m3/h; Δp 1.8 bar; PN 16; flow
restrictor Δpb 0.5 bar; T

- 1× PCV-VFQ 21 DN 100
Code No.: 003G1535

- 1× Pilot controller AVP DN 25
PN16 0.3 - 2.0 bar

Code No.: 003H6379

- 1× Pilot controller AVP-F 0. 5

Code No.: 003H6 391

- 1× Mounting set for Impulse
tube Code No.: 0 03G159 9

1)

Contains accessorie s for remounting

the impulse tub e on the pilot controller
from intter nal connection (factor y
delivered) to e xternal connectio n.

2)

Contains accessories fo r remounting

the impulse tub e on the pilot controller
from internal co nnection (factory
delivered) to e xternal connectio n.

max

150 °C

DN 150-250
PCV-VFQ 21 - Main controller, throttling element, throttle valves, impulse tubes

Flow range (m3/h)

∆pb 0.2 bar ∆pb 0.5 bar

15-14 5 25-220 12 0 03G1535

15-14 5 25-220 12 0 03G154 5

DN 40

DN

k

T

VS

max

(mm)

(m3/h)

PN Connection

(°C)

150 320

150

16

Flange EN 1092-2

25

200 450 20 -180 30-280

250 630 25-250 40-380 0 03G1537

150 320

200 450 20 -180 30-280

250 630 25-250 40-380 0 03G1547

Ø 6 × 1 × 3000 mm

Ø 10 × 1 × 1500 mm

Impulse tube

Copper

Stainless steel Ø 10 × 0.8 × 1500 mm

AVP Pilot controller for differential pressure control

DN

k

T

VS

max

(mm)

(m3/h)

PN Connection

(°C)

40 16 150 25 Flange EN 1092-2

Mounting set for Impulse tube

1)

Δp setting

range

(bar)

0. 2-1.0

0.3-2.0 003H6379

1-5

3-12

AVP- F Pilot controller for flow control

DN

k

T

VS

max

(mm)

(m3/h)

PN Connection

(°C)

40 16 150 25 Flange EN 1092-2

Mounting set for impulse tube

2)

Δp

b

(bar)

0.2

0.5 003H 6391

Δp

(bar)

Δp

(bar)

Δp

max

(bar)

max

Code No.

003G153 6

10

003G1546

10

Code No.

003H6373

16

on request

003G1599

max

16

Code No.

003H6385

003G1599

1)

Impulse tub es on T>150 °C or PN> PN 16

should be of stai nless steel

2)

Consist of a nipple , compression ring

and nut

Accessories

Type designation Description Connections Co de No.

Impulse tube set AF

Compression fitting

Throttle valve-PCV Regulating and shut-off device - 065Z1502

Service kits AVP(-F) flow

Type designation

Valve insert

Type designation

Actuator without adjustable handle (AVP-F)

Actuator with adjustable handle (AVP)

Service kits VFQ 21

Type designation For valve

- 1× Copper tube Ø10 × 1 × 1500 mm

1)

- 1 × compression fitting for imp.
tube connection to pipe (G ⁄)

- 003G1391

- 2 × socket

2)

For impulse tube Ø10 connections to
controller

DN

(mm)

G ⁄ 003G1468

k

DN

VS

(m3/h)

25 8.0

Δp setting range

(bar)

0.2

0.5

0. 2-1.0

0.3-2.0

k

VS

(m3/h)

Code No.

003H6875

Code No.

003H6839

003H6840

003H6834

003H6835

Code No.

Valve insert VFQ 2 40 20 065B2799

Stuffing cone (with EPDM O-rings) 003G1464

4 | AI179486466874en-010303 © Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Installation positions Both main and pilot controllers have to be

installed in horizontal pipes only, with a pressure
actuator oriented downwards.

Installation in return pipe

Main controller

Throttling
element

Pilot controllers

T

max

= 150 °C

Installation in flow pipe

Main controller

Throttling
element

Pilot controllers

Function Pressure changes from inlet pipe (+p) and from

throttling element (-p) are being transferred
through the impulse tubes to the main actuator
chambers and act on control diaphragm

In case of small flow rates the main controller is
closed and control is taken by the pilot controller
only. With increasing the flow rate, a negative
pressure is built in the throttling element.
This partial vacuum acts on the main actuator
diaphragm and causes the main controller to
open.

◯ p

−

Throttling
element

Throttle valve

Bypass

⊕ p

Main valve

Main controller

Main actuator

Pilot controller

AI179486466874en-010303 | 5© Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Pressure temperature
diagram

Working area is below P-T line
and it ends at Tmax for each
valve

PN 16

EN - GJL- 250
(GG -25)

PN 25

EN-GJS- 400
(GGG-40.3)

Dimensions

150

150

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-2)

PN 40

EN-GP-240-GH
(GS- C 25)

150

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-1)

Impulse tubes (pos. ①, ②, ③) are part of the
delivery. Their shape depends on the controller
type. In case of high temperatures
(T

> 150 °C) seal pots have to be installed. For

max

details see relevant Instructions.

T

150 °C DN 50-250

max

The components shown with dashed lines are
NOT part of the delivery. The pipes (pos. ④) must
be welded during mounting.

L

④

②

D

DN 50 65 80 100 125 150 200 250

L

H

1

H

2

D 263 263 263 263 263 380 380 380

230 290 310 350 400 480 600 730

390 425 425 530 530 619 6 47 697

mm

152 16 4 164 194 19 4 269 332 355

①

③

Impulse

tubes

①

②

③

T

max

200 °C 300 °C

Cu Ø 6 × 1

SS Ø 10 × 0.8

Cu Ø 10 × 1

SS Ø 10 × 0.8

2

H

1

H

6 | AI179486466874en-010303 © Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

Dimensions (cont inuous)

T

150 °C DN 50-125

max

throttling element

pilot controller AVP-F

pilot controller AVP

Pipes Pos. ④:
DN 25: Pipes Ø 33.7 × 2.6
DN 40: Pipes 48.3 × 3.2

T

150 °C DN 150-250

max

④

④

DN 50 65 80 10 0 125

A

160

244

mm

290 290 290 290 290

B

1

D

75

159

ca . 120 0

75

159

A

A

Pipes Pos. ④:
DN 25: Pipes Ø 33.7 × 2.6
DN 40: Pipes 48.3 × 3.2

min 300

290

200

ca. 1200

DN 15 0 200 250

D

1

A 320 350 410

B 310 336 412

320 385 500

mm

200

min 300

AI179486466874en-010303 | 7© Danfoss | 2021.02

Data sheet Pilot-controlled differential pressure and flow controller PCVPQ (PN 16, 25, 40)

6

20

(1 revolution of spindle equals to 1 mm stroke)

Flow [l/min]

Throttle valve

Flow diagram

Throttle valve is regulating and shut-off device,
which is / are installed on the impulse tubes
connected to main PCV actuator. Number of
used throttle valves can be seen in table for Main
actuator in Technical Data section.

Function of throttle valve is to control flow
speed through impulse tube and consequently
influence on PCV’s reaction time. Influence
on reaction time is not completly defined and
strongly depends on application conditions
and could significantly vary from application to
application.

In general:

- by opening of the valve (clockwise) PCV’s
reaction time increases

- by valve closing (counterclockwise) PCV’s
reaction time decreases

In case valve is completly closed it has function
as shut-off valve.

Throttle valve is delivered from factory in
completly open position.

Main data:

• DN 4

• used for Ø10 mm impulse tube

5

4

3

2

1

0

0 2 4 6 8 10 12 14 16 18

Stroke [mm] = no. of revolution

© Danfoss | DHS-SRMT/SI | 2021.028 | AI179486466874en-010303