FläktGroup eQ Controls VXG41 Installation and Maintenance Manual

Brand: FläktGroup

Model: eQ Controls VXG41

Type: Installation and Maintenance Manual

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

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

50 - 40

100

0,8

0,6

0,5

0,4

0,3

0,2

0,1

0,08

0,06

DATASHEET

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

00,2 0,40,6 0,81

B - AB

A - AB

Stroke H / H10

Working pressure [bar]

120

- 60

-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

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

L3 H1

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

FläktGroup eQ Controls VXG41 Installation and Maintenance Manual

FläktGroup eQ Controls VXG41 Installation and Maintenance Manual

FläktGroup eQ Controls VXG41 Installation and Maintenance Manual

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