Three-way reversing valve
Thermostatic 3-way control
valves
For heating and cooling systems
IMI HEIMEIER / Thermostatic heads and Radiator valves / Three-way reversing valve
Three-way reversing
valve
Three-way reversing valve for the distribution of mass flow in heating
and cooling systems.
Key features
>> Valve body in gunmetal
>> Stainless spindle with double
>> For all IMI Heimeier thermostatic
>> Outer O-ring can be replaced while
O-ring seal
corrosion-resistant and safe
heads and actuators
under pressure
Technical description
Three-way reversing valve for the
distribution of mass flow in heating and
cooling systems, made of gunmetal, with
protection cap.
Stainless spindle has double O-ring seal.
Outer O-ring can be replaced without
draining the system.
Models: flat sealing, and flat sealing
with T-piece. Connection with threaded,
soldering, or welding nipples.
Low-pressure steam 110°C (230°F)/
0.5 bar.
Models: conically sealing DN 15,
G3/4 male thread. Connection with
IMI Heimeier compression fittings for
plastic, coppe or precision steel pipes.
Allowable differential pressure
Maximum allowable working pressure
10 bar.
Construction
Three-way reversing valve
I
II
III
2
DN 15 = 1.20 bar
DN 20 = 0.75 bar
DN 25 = 0.50 bar
Function
The EMO T (brochure: EMO T) thermal actuator is used for
two-step control with auxiliary power.
In the model normally open (NO), the straight passage I-II of
the three-way reversing valve is open without, and the angled
exit I-III is closed without current.
In the model normally closed (NC), the straight passage I-II of
the three-way reversing valve is closed without, and the angled
exit I-III is open without current.
Thermostatic heads (brochure: Thermostatic Head K with
contact or immersion sensor and/or thermostatic heads) are
used for proportional control without auxiliary power. They also
operate in intermediate positions. When the temperature rises,
the straight passage I-II is closed and the angled exit I-III is
opened.
The EMO 1, EMO EIB, EMOLON, and/or EMO 3 / EMO 3/230
motorized actuators are used for proportional and/or three-step
control with auxiliary power. The effective direction is determined
by the controller or the connection (brochure: EMO, EMO EIB,
EMOLON).
Application
Distributing function
– Switching between heat consuming apparatuses such as the
heating circuit and heater for potable water or between various
heat generating devices such as boilers, heat pumps, or solar
energy systems.
–O
utput control of heat exchangers via flow rate control, e.g.
for air heaters, coolers or other heat exchangers. Volume flow
remains steady in the primary circuit.
Mixing function
– Mixing control through installation in the return pipe (external
mixing point). Approximately equal volume flow in the
secondary circuit.
Principle
Pay attention to the flow direction, see function.
Distributing function
Mixing function
Mischpunkt
II
I
III
III
II
I
3
IMI HEIMEIER / Thermostatic heads and Radiator valves / Three-way reversing valve
Sample application
A
D
1. Oil/gas boiler
2. Heating circuit
3. Hot water storage
4. Boiler for solid fuels
5. Heat exchanger
6. Air heater
7. Fan-coil device
8. STAD balancing valve
9. Primary circuit
10. Secondary circuit
Note
The composition of the heat transfer medium should be one
which avoids damage or the accumulation of stones in hot
water heating systems, in accordance with VDI guide line 2035.
For industrial and long-distance energy systems, see applicable
codes VdTÜV and 1466/AGFW FW 510.
Heat transfer media containing mineral oils or lubricants
containing mineral oil can have seriously negative effects on
the source apparatus and usually lead to the disintegration of
EPDM seals.
4
B
C
E
A. S
witching between heat consumers such as heating circuits
and hot water storages with e. g. EMO T.
B. S
witching between heat generating devices such as an oil/
gas boiler or boilers for solid fuels with e. g. EMO T.
C. F
low rate control for constant blow-out temperature with air
heaterswith thermostatic head K with contact sensor.
D. S
witching with fixed-command control of the flow
temperature to a secondary circuit of the heat exchanger,
such as heaters for potable water, industrial pools, and
swimming pool water with thermostatic head K with contact
sensor.
E. Control of the water circuit from fan-coil devices (air
conditioners / forced air convectors) with e. g. EMO T.
When using nitrite-free frost and corrosion resistance solutions
with an ethylene glycol base, pay close attention to the details
outlined in the manufacturers’ documentation, particularly details
concerning concentration and specific additives.
Technical data
Diagram – Three-way reversing valve with actuator
DN 25 (Kvs 5,12)
DN 20 (Kvs 3,48)
DN 15 (Kvs 2,47)
5000
30
300
3000
20
200
2000
10
100
1000
5
50
500
3
30
300
2
20
200
1
10
100
0,5
5
50
0,3
3
30
0,2
2
20
0,1
50
100
200 300
500
1000
1
2000 3000 5000
10
∆p [mm WS]
500
∆p [mbar]
∆p [kPa]
DN 15 (Kvs 2,25)
50
m [kg/h]
Three-way reversing valve with Thermostatic head K *)
Three-way reversing
valve with immersion/
sensor
Kv-value
P-band [K]
Kvs
2,0
4,0
6,0
8,0
0,60
1,20
1,71
2,10
2,47
0,57
1,11
1,58
2,00
2,25
DN 20
0,70
1,50
2,39
3,10
3,48
DN 25
1,08
2,28
3,48
4,62
5,12
DN 15
DN 15
with T-piece
*) The Kv values correspond to the flow in the direction of passage I-II at the given system deviations. With the models without
T-piece the kvs-values corresponds to the flow in the direction I-II with a completely opened valve and in the direction I-III with a
closed valve. With the models with T-piece the Kv/Kvs-values corresponds to the flow in the direction I-II.
Sample calculation
Goal: Pressure loss ΔpV
Given: Three-way reversing valve DN 25 with thermal actuator
Heat flow Q = 21000 W
Temperature adjustment Δt = 20 K (70/50°C)
Solution: Mass flow m = Q / (c · Δt) =21000 / (1,163 · 20) = 903 kg/h
Pressure loss from diagram ΔpV = 31 mbar
Cv =
Kv
0,86
Kv = Cv · 0,86
5
IMI HEIMEIER / Thermostatic heads and Radiator valves / Three-way reversing valve
Articles
Three-way reversing valve
Flat sealing
DN
EAN
Article No
15
20
25
4024052222711
4024052223114
4024052223510
4160-02.000
4160-03.000
4160-04.000
With T-piece, Flat sealing
DN
EAN
Article No
15
4024052226016
4162-02.000
Conically sealing with compression fittings for CU-pipe, ø 15 mm. Male thread G3/4
DN
EAN
Article No
15
4024052225910
4161-15.000
Conically sealing. Male thread G3/4
6
DN
EAN
Article No
15
4024052323654
4161-02.000
Accessories – Flat sealing
Connecting nipple for flat sealing
three-way reversing valves
DN valve
EAN
Article No
Threaded nipple
15 (1/2”)
R1/2
20 (3/4”)
R3/4
25 (1”)
R1
4024052222810
4024052223213
4024052223619
4160-02.010
4160-03.010
4160-04.010
Soldered nipple
Ø Pipe
15 (1/2”)
15
15 (1/2”)
18
20 (3/4”)
22
25 (1”)
28
4024052224814
4024052225019
4024052225217
4024052225415
4160-15.039
4160-18.039
4160-22.039
4160-28.039
Welded nipple
Ø Pipe
15 (1/2”)
20,8
20 (3/4”)
26,3
25 (1”)
33,2
4024052222919
4024052223312
4024052223718
4160-02.043
4160-03.043
4160-04.043
Ø Pipe
EAN
Article No
12
15
16
18
4024052214211
4024052214617
4024052214914
4024052215218
3831-12.351
3831-15.351
3831-16.351
3831-18.351
Accessories – Conically sealing
Compression fitting
for copper or precision steel pipe.
Connection male thread G 3/4.
Brass nickel-plated.
With a pipe wall thickness of 0.8-1 mm
insert supporting sleeves. Heed pipe
manufacturer’s technical advice.
Support sleeve
for copper or precision steel pipe with a
1 mm wall thickness.
Brass.
Compression fitting
for copper or precision steel pipes.
Male thread connection G 3/4.
Soft sealed.
Nickel-plated brass.
Compression fitting
for plastic pipes.
Male thread connection G 3/4.
Nickel plated brass.
Ø Pipe
L
EAN
Article No
12
15
16
18
25,0
26,0
26,3
26,8
4024052127016
4024052127917
4024052128419
4024052128815
1300-12.170
1300-15.170
1300-16.170
1300-18.170
Ø Pipe
EAN
Article No
15
18
4024052515851
4024052516056
1313-15.351
1313-18.351
Ø Pipe
EAN
Article No
14x2
16x2
17x2
18x2
20x2
4024052134618
4024052134816
4024052134915
4024052135110
4024052135318
1311-14.351
1311-16.351
1311-17.351
1311-18.351
1311-20.351
7
IMI HEIMEIER / Thermostatic heads and Radiator valves / Three-way reversing valve
Dimensions
flat sealing
flat sealing, with T-piece
conically sealing
SW
H
D
D
D
D
D
L2
L4
L1
D
H
H
SW
D
L3
D
D
D
L
L
DN
D
L
L1
L2
L3
L4
H
SW
15
20
25
G3/4
G1
G1 1/4
62
71
84
25,5
35,5
42,0
50
58
23,5
26,0
31,0
33,5
30
37
47
SW = Spanner opening
D
L
l
Threaded nipple
R1/2
27,5
R3/4
30,5
R1
33
13,2
14,5
16,8
D
l
L
Soldering nipple
15
18
16
19
18
20
22
23
28
27
12
13
14
17
20
D
d
L
Welding nipple
20,8
35
26,3
40
33,2
45
17
22
28
The products, texts, photographs, graphics and diagrams in this document may be subject to
alteration by IMI Hydronic Engineering without prior notice or reasons being given. For the most up
to date information about our products and specifications, please visit www.imi-hydronic.com.
3100-18.483 10.2014