Danfoss V21 D28 is a self-acting pressure reduction controller primarily for use in oil applications such as light and heavy oil, fuel oil and especially high viscous media. It can be used for pressure reduction in heating and cooling plants. The controller is normally open and closes on rising pressure.
The technical parameters on the product labels determine the use.
Features:
- Pressure setting range: 1-20 bar
- Maximum test pressure: 1.5 x PN
- Can be installed in horizontal pipes only with a pressure actuator oriented upwards
- Impulse tube connections on both sides of diaphragm have to be closed in order to avoid (potential) leakage of medium out
Danfoss V21 D28 is a self-acting pressure reduction controller primarily for use in oil applications such as light and heavy oil, fuel oil and especially high viscous media. It can be used for pressure reduction in heating and cooling plants. The controller is normally open and closes on rising pressure.
The technical parameters on the product labels determine the use.
Features:
- Pressure setting range: 1-20 bar
- Maximum test pressure: 1.5 x PN
- Can be installed in horizontal pipes only with a pressure actuator oriented upwards
- Impulse tube connections on both sides of diaphragm have to be closed in order to avoid (potential) leakage of medium out
1
Installation Guide
V21D28 (PN 16, PN 25)
Danfoss Heating VI.LR.J1.02 DH-SMT/SI
ENGLISH
Pressure reduction controller for oil V21D28 www.danfoss.com Page 4
2
∆p = 1.0-5.0
Ø 172
L
H
∆p = 12-20 (DN 15-50)
L
H
2
Ø 195
∆p = 3.0-11
∆p = 10-16
Ø 172
L
H
1
①
②
③
④
⑤
Installation Guide V21D28 (PN 16, PN 25)
DH-SMT/SI VI.LR.J1.02 Danfoss Heating
DN 15 20 25 32 40 50 65
L
mm
130 150 160 180 200 230 290
H 580 585 595 605 615 620 630
H
1
585 590 600 610 620 625 635
H
2
765 770 780 790 800 805 815
❶ ❷
❸
33
A
❺
❻
③
①
② ①
②
17 mm
22 mm
17 mm
22 mm
④
①
②
Installation Guide V21D28 (PN 16, PN 25)
Danfoss Heating VI.LR.J1.02 DH-SMT/SI
❹
4
Safety Notes
Prior to assembly and commissioning
to avoid injury of persons and damages
of the devices, it is absolutely necessary
to carefully read and observe these
instructions.
Necessary assembly, start-up, and
maintenance work must be performed
only by qualified, trained and authorized
personnel.
Prior to assembly and maintenance work
on the controller, the system must be:
- depressurized,
- cooled down,
- emptied and
- cleaned.
Please comply with the instructions of the
system manufacturer or system operator.
Before starting welding procedures
necessary fire preventing measures must
be taken.
Disposal instruction
This product should be
dismantled and its
components sorted, if
possible, in various groups
before recycling or disposal.
Always follow the local disposal
regulations.
Definition of Application
V21D28 is a self-acting pressure reduction
controller primarily for use in oil
applications such as light and heavy oil,
fuel oil and especially high viscosius media.
In case of heavy oil there is no need to heat
it with steam. It can be used for pressure
reduction in heating and cooling plants.
The controller is normally open and closes
on rising pressure.
The technical parameters on the product
labels determine the use.
Assembly
Admissible Installation
Positions ❶
Controllers can be installed in horizontal
pipes only with a pressure actuator
oriented upwards. This installation position
enables the transfer of media temperature
to the actuator.
Installation Location and
Installation Scheme ❷
Valve Installation ❸
1. Clean pipeline system prior to assembly.
2. The installation of a strainer in
front of the controller is strongly
recommended ①.
3. Install pressure indicators in front of
and behind the system part to be
controlled.
4. Install valve
• Theowdirectionindicatedonthe
product label ② or on the valve ③
must be observed.
• Flanges④ in the pipeline must be in
parallel position and sealing surfaces
must be clean and without any
damage.
Tightenscrewsinangescrosswise
in 3 steps up to the maximum torque
(50 Nm).
5. Caution:
Mechanical loads of the valve body by the
pipelines are not permitted ⑤.
Impulse tube connections on both sides of
diaphragm have to be closed in order to
avoid (potential) leakage of medium out.
Insulation ❹
It is not recommended to insulate pressure
actuator ①. Valve ② may be insulated.
Dimensions, Weights
(See page 2)
FlangesPN25,acc.toEN1092-2
Filling the system, first start-
up ❺
To avoid too high pressure differences
on the controller, observe the following
sequence when opening the shut-off
valves:
1. Release spring by turning the set-point
adjuster A
2. Slowly open shut-off devices in the
return pipeline ①
3. Slowly open shut-off devices in the
supply pipeline ②.
Leak and Pressure Tests
Pressure must be gradually increased at the
+/- connection.
Non-compliance may cause damages at
the actuator or the valve.
A pressure test of the entire system
must be carried out in accordance with
manufacturer’s instructions.
The maximum test pressure is: 1.5 × PN
PN - see product label!
Putting out of operation
1. Slowlycloseshut-odevicesintheow
pipeline.
2. Slowly close shut-off devices in the
return pipeline.
Settings ❻
Pressure Setting
The pressure setting range is indicated on
the product label.
Procedure:
1. Startsystem,seesection“Fillingthe
system, first start-up“
Completely open all shut-off devices in
the system.
Open compression fitting on lover side
of the adapter to release air out.
2. Adjustment (of the pressure after the
valve)
Observe pressure indicator ①.
• Turningtotheright(clockwise)②
- actuators type A: increases setpoint
- actuators type B: decreases setpoint
•
Turning to the left (counter-clockwise) ③
- actuators type A: decreases setpoint
- actuators type B increases setpoint
Note:
Actuators type A: setting ranges 1-5 bar,
3-11 bar, 10-16 bar
Actuators type B: setting range 12-20 bar
Seal
The set-point adjuster can be sealed by a
seal wire ④, if necessary (PN 16 ony).
Installation Guide V21D28 (PN 16, PN 25)
DH-SMT/SI VI.LR.J1.02 Danfoss Heating
ENGLISH
55
Installation Guide V21D28 (PN 16, PN 25)
Danfoss Heating VI.LR.J1.02 DH-SMT/SI
6
Installation Guide V21D28 (PN 16, PN 25)
DH-SMT/SI VI.LR.J1.02 Danfoss Heating
77
Installation Guide V21D28 (PN 16, PN 25)
Danfoss Heating VI.LR.J1.02 DH-SMT/SI
Installation Guide V21D28 (PN 16, PN 25)
73695490/VI.LR.J1.02
Produced by Danfoss A/S © 05/2010
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Danfoss V21 D28 is a self-acting pressure reduction controller primarily for use in oil applications such as light and heavy oil, fuel oil and especially high viscous media. It can be used for pressure reduction in heating and cooling plants. The controller is normally open and closes on rising pressure.
The technical parameters on the product labels determine the use.
Features:
- Pressure setting range: 1-20 bar
- Maximum test pressure: 1.5 x PN
- Can be installed in horizontal pipes only with a pressure actuator oriented upwards
- Impulse tube connections on both sides of diaphragm have to be closed in order to avoid (potential) leakage of medium out
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