DRU/HE
THREE-WAY ROTARY VALVE PN10 AND HE25/32 EXTENSION
PRODUCT DATA
APPLICATION
The DRU25/32 Three-Way Rotary Valve provides water
temperature control in heating and air-conditioning
applications. These valves are designed for accurate mixing
control of supply water temperature and return-flow
temperature.
The sturdy construction ensures long operating life and high
reliability when used in combination with M6061/VMM and
M7061/VRM actuators. The special inner form of the housing
and the all around changeable rotary plug allow the valve to
be adapted to each possible application without having to
drain the system. In combination with the distance-adjustable
HE25/32 Extension, use in a wide range of pre-piped systems
is possible.
FEATURES
• Chrome-plated plug for long life-span
• Optimized characteristics for supply water
temperature control
• All around changeable rotary plug
• Reliable and easy mounting of electrical actuators
• Wide range of flow rates in two housing sizes
• Compact design
• Use for manifolds by accessory HE25/32 Extension
• Thermal insulation package included
SPECIFICATIONS
Nominal static pressure 10 bar; 1000 kPa
Maximum pressure drop dependent on type (see table on
page 3)
Leakage rate < 1% of k
Ports External threads with cap nuts
Angle of rotation 90 °
Packing Double O-ring lined
Material body Cast iron (GG20)
Material inner parts Chrome-plated cast iron
Medium Heating water according to VDI
2035 (oxygen concentration less
than 0.2 g/m
Water temperatures in the valve
2...130 °C, non-condensing
Weight dependent on type (see tables in
section "Dimensions" on page 4)
Flow characteristic equal percentage
VS
3
, pH 8...9.5)
® U.S. Registered Trademark
Copyright © 2008 Honeywell Inc. • All rights reserved
EN0B-0608GE51
R0108
DRU/HE – PRODUCT DATA
OPERATION
The valve controls a mixing water temperature by means of a
rotating plug. The plug adjusts the water flow of two inputs
with two control curves. The required flow water temperature
is achieved by adding a proportion of return water to the
boiler hot water. The DRU has special control characteristics
for optimal control performance.
MOUNTING
Adjustments for Mixing Applications
SUITABLE ACTUATORS
torque
[Nm]
10 M6061A1013 M6061L1019 M7061E1012
20
OS no.
24 Vac float.
M6061A1021 /
VMM20-24
OS no.
230 Vac float.
M6061L1027 /
VMM20
OS no.
0/2...10V
M7061E1020
/ VRM20
09 09
EN0B-0608GE51 R0108 2
09 90
DRU/HE – PRODUCT DATA
Mounting the Actuator
SPECIFICATION AND ORDER NUMBER PER DN
OS No. DN
DRU25-2.5 25 2.5 7-12 100 10
DRU25-4.0 25 4.0 12-17 100 10
DRU25-6.3 25 6.3 17-30 100 10
DRU25-10 25 10.0 30-50 100 10
DRU25-16 25 16.0 50-70 100 10
DRU32-10 32 10 30-50 100 20
DRU32-16 32 16 50-70 100 20
DRU32-25 32 25 70-100 100 20
HE25 25 - - - - - HE32 32 - - - - - -
kvs heat flow ∆p nom. torque actuator
[m³/h] [kW] [kPa] [Nm]
M6061A1021 / VMM20-24,
floating
M6061A1013,
M6061L1019,
M6061L1027 / VMM20
modulating
M7061E1012,
M7061E1020 / VRM20
ACCESSORIES
connection set description DN pipe size [mm] weight [kg] OS No.
Welding sockets with
gasket and cap nut
Soldering sockets with
gasket and cap nut
25
32
25
25
25
32
32
32
25
32
18
22
28
22
28
35
0.3
0.6
0.21
0.21
0.21
0.42
0.42
0.41
WTU25
WTU32
LSU25-18
LSU25-22
LSU25-28
LSU32-22
LSU32-28
LSU32-35
Internal threaded sockets
with gasket and cap nut
3 EN0B-0608GE51 R0108
25
32
25
32
0.21
0.40
STU25
STU32
DRU/HE – PRODUCT DATA
DIMENSIONS
DRU
type DN a b c d e g h R weight [kg]
DRU25-2.5 25 55 32 110 89 55 51 182 1 ½ 2.2
DRU25-4.0 25 55 32 110 89 55 51 182 1 ½ 2.2
DRU25-6.3 25 55 32 110 89 55 51 182 1 ½ 2.2
DRU25-10 25 55 32 110 89 55 51 182 1 ½ 2.2
DRU25-16 25 55 32 110 89 55 51 182 1 ½ 2.2
DRU32-10 32 70 44 140 99 70 59 200 2 4.1
DRU32-16 32 70 44 140 99 70 59 200 2 4.1
DRU32-25 32 70 44 140 99 70 59 200 2 4.1
a
b d
R
c
e
HE
type DN a b e f g R weight [kg]
HE25 25 110 42 55 0-25 51 1 ½ 1.7
HE32 32 140 51 70 0-50 59 2 2.7
=g
e
a
b
f
gg
h
R
EN0B-0608GE51 R0108 4
DRU/HE – PRODUCT DATA
HYDRAULIC FUNCTION
Characteristics
100%
80%
60%
40%
20%
0%
Spare Parts
• O-ring (part no.: 07169 9535)
V5434T
3
2
5
4
6 7 8 9
5 EN0B-0608GE51 R0108
DRU/HE – PRODUCT DATA
V
/
VALVE DIMENSIONING
Honeywell Rotary Valves are employed mainly in hydraulic systems corresponding to the examples shown on page 2. The
rotary valve can be set quite easily. In order to obtain good control characteristics, the pressure drop in the rotary valve should
be about the same as the pressure drop in the "volume-variable" part of the pipe system, i.e. about 1.5...4.0 kPA or 15...40
mbar. The following dimensioning diagram is based on this interrelationship. The setting is obtained as follows:
1. Find heat flow in the diagram.
2. Move vertically upwards to the intersection with the corresponding
can be read off on the left in liters per hour.
3. Move horizontally to the right from the intersection with the
the nominal rotary valve size to be selected.
4. From this intersection, go vertically downwards. Read off the pressure drop in the rotary valve in kPa (mbar).
VOLUME FLOW (m3/h)
&
Q
&
∆ϑ
line. On the vertical axis, the volume flow
∆ϑ
line into the shaded section (1.5-4.0 kPa). Here you will find
V
1010
5
2
=
S
V
k
6
1
=
S
V
2
3
N
)
C
°
(
K
0
1
K
=
5
1
ϑ
∆
K
K
0
3
0
2
K
0
K
4
0
5
D
2
3
N
D
/
5
2
N
D
2
N
D
2
3
N
D
/
5
5
N2
D
5
2
N
D
5
N2
D
k
0
1
=
S
V
k
3
.
6
=
S
V
k
4
=
S
V
k
5
.
2
=
S
V
k
77
55
33
22
11
0.70.7
0.50.5
0.30.3
OLUME FLOW (m3
h)
0.20.2
100
10
(mbar)
(kPa)
Example
0.3
5
3
4
0.7
0.5
5
10 100 7
7
30 20
20 200 10
HEAT FLOW (kW)
Given: Heat flow = 10 kW, ∆ϑ = 15 K (e.g. 70/55 °C)
70 50
50 30
2
0.2
&
Q
3
1
2
PRESSURE DROP
70
5
7
Required: Nominal rotary valve size and pressure drop
Volume flow:
&
V
Result: According to the diagram, the correct valve size is DN25, k
drop is 2 kPa or 20 mbar or 200 mm water column.
&
Q
=
∗
ϑ
∆1.163
10
=
=
151.163
∗
3
/hm 0.57
4.0 (DRU25-4.0). The pressure
vs
(Factor 1.163 contains the water density 1000 kg/m3 and the specific heat capacity 4.19 kJ/kgK.
Unit Conversion
1 kW = 3600 kJ/h 1 bar = 100 kPa
∆ϑ
is the temperature difference between supply and return flow in Kelvin)
= 860 kcal/h = 10 m water column
1000 kcal/h = 1.163 kW 1 mbar = 10 mm water column
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorized Representative:
Automation and Control Solutions
Honeywell GmbH
Böblinger Straße 17
D-71101 Schönaich
Phone: (49) 7031 63701
Fax: (49) 7031 637493
http://ecc.emea.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-0608GE51 R0108
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