FläktGroup DC_8790GB 20180509_R0 Specifications are subject to alteration without notice
For use in heating, ventilating and air conditioning systems
as a control valve for mixing and diverting functions.
• External thread, PN16
• Bronze CuSn52nPb2 valve body
• DN15 ... DN50 mm (½ ...2”)
• Kvs 1,6 ... 40 m³/h
• Lift height 20 mm
• Can be equipped with STAZ-16, STBZ-16, STCZ-50
• Fittings can be delivered separately
• Media temperature: -25...+150 °C
• For open and closed circuits
Intended for cooling water, chilled water, hot water, tap water, water with antifreeze (max 50%) and saline.
DN = Nominal size
Kvs = Nominal flow rate of cold water (5…30 °C) through the fully open valve (H100) by a differential pressure
of 100 kPa (1 bar)
Sv = Rangeability kvs/kvr
kvr = Smallest kv value, at which the flow characteristic tolerances can still be maintained, by a differential
pressure of 100 kPa (1 bar)
∆pmax = Maximum permissible differential pressure across valve’s control path, valid for the entire actuating range
of the motorized valve
STCZ-53 Type DN Kvs SvFitting set STAZ-16, STBZ-16, STCZ-50
[m³/h] aducergods Δp max Mixing [kPa] Δp max diverting [kPa]
cccc=0400 VXG41.50 50 40 >100 ALG503 ww300 100
1) If noise is permitted, subject to the same values as the assembly as a mixing valve.
2) These types are serially executed with tight bypass.
3-PORT SEAT VALVES WITH EXTERNAL THREAD,
STAZ-16, STBZ-16, STCZ-53
DATASHEET
DATASHEET
2
FläktGroup DC_8790GB 20180509_R0 Specifications are subject to alteration without notice
VALVE CROSS SECTION
FLOW DIAGRAM
• Guided perforated plug which is integrated in the valve stem.
• A pressed-in stainless steel seat ring is used as seat A – AB.
Δpvmax= Maximum permis-
sible differential pressure
across the valve (mixing:
port A - AB, B - AB), valid
for the entire actuating
range of the motorized valve
Δpv100= Differential pressure
across the fully open valve
and the valve’s control path
A – AB, B - AB by a volume
flow V100.
V100= Volume flow through
the fully open valve (H100)
1 m³/h= 0,278 l/s water at
20 °C
100 kPa= 1 bar ≈ 10 mWC
DN - k
vs
50 - 40
100
80
60
50
40
30
20
10
8
6
5
4
3
2
1
0,8
0,6
0,5
0,4
0,3
0,2
0,1
0,08
0,06
DATASHEET
3
FläktGroup DC_8790GB 20180509_R0 Specifications are subject to alteration without notice
VALVE CHARACTERISTICS MAINTENANCE
STEM SEALING GLANDS
The glands can be exchanged without removing the valve,
provided the pipes are depressurized and cooled off and
the stem surface is unharmed.
If the stem is damaged in the gland range, replace the entire
stem-plug-unit.
DISPOSAL
Before disposal the valve must be dismantled and
separated into its various constituent materials.
Legislation may demand special handling of certain
components, or it may be sensible from a ecological
point of view. Current local legislation
must be observed.
FUNCTIONAL DATA
Important!
Valves require no maintenance.
When doing service work on the valve/
actuator:
• Deactivate the pump and turn off the power
supply.
• Close the shutt off valves.
• Fully reduce the pressure in the piping sys-
tem and allow pipes to completely cool down
If necessary, disconnect the electrical wires.
Before putting the valve into operation again,
make certain the actuator is correctly fitted.
Fl ow k v / k vs
ABA
0,8
0,6
0,4
0,2
0
1
00,2 0,40,6 0,81
B - AB
A - AB
B
Stroke H / H10
Working pressure [bar]
12
13
16
0
120
- 60
14
15
1
-25
-40008001
20 150180
Working temperature [°C]
Throughport: 0…30% Linear
30…100 % equal-percentage ngl = 3 to VDI/VDE 2173
Bypass: 0...100% Linear
Mixing: Flow from port A and port B to port AB
Diverting: Flow from port AB to port A and port B
Port AB: Flow A+B
Port A: Variable flow
Port B: Bypass (variable flow)
Working pressure and medium temperature staged as per
ISO 7005. Current local legislation must be observed.
Working pressure (bar) Flow kv/kvs
Stroke H/H100
WORKING PRESSURE AND TEMPERATURE
Working temperature (°C)
COMMISSIONING
Important!
Commission the valve only if the actuator
has been mounted correctly.
Valve stem retracts: Throughport A –
AB opens, bypass B closes.
Valve stem extends: Throughport A –
AB closes, bypass B opens.
PN class PN 16 to ISO 7268
Operating
pressure
To ISO 7005 within the permissible medium
temperature range according to the diagram
on page 2
Flow
characteristic
Throughport: 0...30 % – Linear
Throughport: 30...100 % – equal percentage,
Ngl=3 to VDI / VDE 2173
Bypass: 0...100 % – Linear
Leakage rate Throughport: 0…0.02 % of kvs value to DIN
EN 1349
Bypass std: 0,5...2 % of kvs value
Bypass VXG41..01: 0...0,02 of kvs value
Permissible
media
Cooling water, chilled water, low temperature
hot water, high temperature hot water, water
with anti-freeze;
recommendation: water treatment to
VDI 2035
Medium
temperature
-25...150 °C
Rangeability SvDN 15: > 50
DN ≥20: >100
Lifting height 20 mm
DATASHEET
4
FläktGroup DC_8790GB 20180509_R0 Specifications are subject to alteration without notice
THREADED FITTINGS
INDUSTRY STANDARDS
DIMENSIONS/WEIGHT
MATERIAL
DN = Nominal size
H = Total actuator height plus minimum distance to the
wall or the ceiling for mounting, connection,
operation, service, etc.
H1 = Dimension from the pipe centre to install
the actuator (upper edge).
H2 = Valve in the «Closed» position means that the stem
is fully extended
On valve side: cylindrical thread to ISO 228-1.
On pipe side: with cylindrical thread to ISO 7-1.
Pressure
Equipment
Directive
PED 2014/68/EU
Pressure
Accessories
Scope: Article 1, section 1
Definitions: Article 2, section 5
Fluid group 2 without CE-marking as per article 4,
section 3 (sound engineering practice)
Environmental
compatibility
ISO 14001 (Environment)
ISO 9001 (Quality)
SN 36350 (Environmentally compatible products)
RL 2002/95/EG (RoHS)
Valve body Bronze CuSn5Zn5Pb2
Seat, plug,
stem
Stainless steel
Sealing gland Dezincification-free brass, silicon-free
Gland
materials
EPDM O rings, silicon-free
G
L1
H
H2
L3 H1
B
L2
STCZ-53 Type DN B G L1 L2 L3 H1 H2 H Weight
(mm) (mm) (mm) (mm) (mm) (mm) (mm) SAX.. (kg)
cccc=
0400 VXG41.50 50 16 G2¾ 150 75 75 46 142,5 > 488 3,90
Type For valve type G [inch] Rp [inch]
ALG503 VXG41.50 G 2¾ Rp 2
/