oventrop Cocon QTZ Technical Information

Page 1

Application:

The pressure independent control valve “Cocon QTZ” with automatic flow control is a valve combination consisting of a flow regulator and a regulating valve. The nominal value of the flow regulator can be set with the help of an easily accessible handwheel. The pressure independent valve can be equipped with an actuator, a temperature controller or a manual head (connection thread M 30 x 1.5).

The pressure independent control valve “Cocon QTZ” is designed to be installed in heating and cooling systems (e.g. central or underfloor heating systems, fan coil units, chilled ceilings, fan convectors etc.) with closed circuits for automatic flow control (hydronic balancing). It can also be used for the control of another variable (e.g. room temperature) by modifying the flow rate with the help of actuators, thermostats or temperature controllers.

Technical data:

Performance data Max. operating temperature: +120°C Min. operating temperature: -10°C Max. operating pressure: 16 bar (1600 kPa) Fluid: Water or mixtures of water and

ethylene/propylene-glycol (max. 50%), ph-value 6.5-10

Max. closing pressure: 16 bar (1600 kPa)

in the direction of flow

“Cocon QTZ”

Pressure independent control valve

Technical information

“Cocon QTZ”

Legend:

1 Flow control unit 1a Diaphragm unit 1b Nominal value unit 2 Control unit

Control range:

10 10 90- 450 15 30- 210 15 90- 450 15 150-1050 20 150-1050 20 180-1300 25 300-2000 32 600-3600

Data for actuator connection:

Connection thread: M 30 x 1.5 Piston stroke: 2.8 mm

Closing dimension: 11.8 mm Closing pressure (actuator): 90 - 150 N

Materials:

Body made of dezincification resistant brass, seals made of EPDM or PTFE, valve stem made of stainless steel.

Function:

The required flow rate is set at the handwheel (see page 3 at the bottom). The nominal setting can be secured by engaging the handwheel and by inserting the locking ring which is lead sealable. During low demand periods, regulation can be carried out with the help of an actuator or a temperature controller which can be screwed onto the valve.

Control range [l/h]

(min.-max.)

30- 210

(DN 10/15/20: 30-1050 l/h)

3.5 mm (DN 20: 180-1300 l/h) 4 mm (DN 25 und DN 32)

Differential pressure p1-p

(min.-max.)

0.2 bar-4 bar

(20 kPa-400 kPa)

0.15 bar-4 bar

(15 kPa-400 kPa)

p3p2p1

1a 2

p2-p3 = constant

p1-p3

The illustrated section of the pressure independent control valve “Cocon QTZ” shows three pressure ranges:

“p1” is the inlet pressure and “p3” the outlet pressure of the valve. “p2” is the pressure actuating the integrated diaphragm unit (pos. 1 a) which maintains the differential pressure “p2” – “p3” at a constant level via the regulating unit (pos. 2) which is activated through the actuator and via the nominal value unit (pos. 1 b) which can be set to a maximum flow rate.

Even where high differential pressure variations “p1” – “p3” occur, e.g. if sections of the system are activated or inactivated, the differential pressure “p2” – “p3” is kept at a constant level. This way the valve authorities of 100% are maintained (a = 1). Even during low demand periods with steady control (e.g. in combination with 0-10 V actuators), the valve authority of the “Cocon QTZ” valve within the effective valve lift amounts to 100% (a = 1).

∆p

2015 Oventrop 1

Page 2

Advantages:

– constant, high valve authority – small dimensions – presetting of the nominal values even with mounted actuator – optical display of the set nominal value even with mounted

actuator

– excellent optical display of the presetting in any installation

position – nominal values can be read off in l/h without conversion – presetting is secured by engaging the handwheel – presetting can be locked and lead sealed with the help of the

locking ring – installation can be optimised by measuring the regulating

pressure – almost linear characteristic line if actuator driven – high valve lift, even with small presetting values – soft sealing valve disc

Volume flow [l/h]

Differential pressure p1-p3 [bar]

The maximum flow volume (V) within the control range is set with

the help of the handwheel. During low demand periods, room temperature control may for instance be carried out with the help of actuators and room thermostats.

“Cocon QTZ”

Pressure independent control valve

DN L1 H1 H2 D

15 66 52 48 G 3⁄4 20 (150-1050 l/h) 74 52 48 G 1 20 (180-1300 l/h) 84 58 54.5 G 1

25 118 66 79 G 11⁄4

32 124 66 79 G 13⁄4

Dimensions

60 54 46 G 1⁄2

Effective valve lift [%]

Volume flow [l/h]

The pressure independent control valve “Cocon QTZ” has an almost linear characteristic line within the effective valve lift. This is advantageous when using actuators (electrothermal or electromotive) which also have a linear stroke behaviour across the control voltage. In general, the valve can also be combined with a temperature controller.

H2 H1

DN L1 L2 H1 H2 D1 D2

15 70 98.5 52 48 R 1⁄2 Rp 1⁄2 20 (150-1050 l/h) 74 106 52 48 R 3⁄4 Rp 3⁄4 20 (180-1300 l/h) 85.5 117.5 58 54.5 R 3⁄4 Rp 3⁄4

25 118 154 66 79 R 1 Rp 1

32 124 165 66 79 R 11⁄4 Rp 11⁄4

Dimensions

DN L1 H1 H2 D

15 74.5 52 48 Rp 1⁄2 20 (150-1050 l/h) 78 52 48 Rp 3⁄4 20 (180-1300 l/h) 89 58 54.5 Rp 3⁄4

25 122 66 79 Rp 1

32 130 66 79 Rp 11⁄4

Dimensions

Actuators:

The pressure independent control valves “Cocon QTZ” can be used with the following Oventrop actuators (M 30 x 1.5):

Actuator Voltage

Electrothermal

Electromotive

24V

230V

24V 1012708 1012700/05 (0-10V)

230V 1012710

EIB 1156065/66*

LON 1157065*

1012816/26*

1012916/26

1012815/25/17*

1012915/25

Regulation behaviour

2 point 3 point Proportional

1012951 (0-10V)*

* Actuators with piston strokes smaller than 4 mm. Due to the

smaller piston strokes, the maximum possible flow rates will not be reached when combining these actuators with valves sized DN 25 and DN 32. Item no. 1012703: After modification of the presetting, the

actuator has to be disconnected from the power for a short time. The “Cocon QTZ” valves can also be used with Oventrop thermostats and Oventrop temperature controllers.

2 2015 Oventrop

Page 3

“Cocon QTZ”

Pressure independent control valve

Minimum differential pressure p1 – p3 for the valve design:

The minimum required differential pressure p1 – p3 across the valve can be obtained for the chart below: Explanation of chart: As for the valves with integrated flow control, the required minimum differential pressure changes depending on the nominal setting. The mathematical interrelationship is considered in the chart.

N 10/DN 15/DN 20 (150 l/h-1050 l/h)

Min. differential pressure p1-p3 [bar]

N 20 (180 l/h-1300 l/h)/DN 25/DN 32

Min. differential pressure p1-p3 [bar]

ominal setting [l/h]

Installation:

– The direction of flow must conform to the arrow on the valve

body.

– The valve may be installed in any position (electric actuators,

except for the actuators 1012915, 1012925, 1012916 and 1012926, may not be installed vertically downwards).

–

Do not use any lubricant or oil when installing the valve as these may destroy the valve seals. All dirt particles and lubricant or oil residues must be removed from the pipework by flushing the latter.

– Any tension applied on the valve by the pipework must be

avoided.

– When choosing the operating fluid, the latest technical

development must be considered (e.g. VDI 2035).

– Isolating valves for maintenance are to be installed in front of

and behind the valve.

– A strainer has to be installed in the supply pipe if the operating

fluid is contaminated (see VDI 2035).

– The correction factors of the manufacturers of the antifreeze

liquids have to be considered when setting the flow rate.

– Once installation is completed, check all installation points for

leaks. Pipe connection: – Use suitable compression fittings “Ofix”, tailpipe connection

sets or inserts (when using flat sealing tailpipes) of the Oventrop

product range.

Isolation

Strainer

Control valve

Isolation

Cooling

Heating

Cocon QTZ”

“

ith actuator

ew point control

oom

hermostat

System illustration: Four pipe system

Setting of the flow rate:

The maximum flow rate can be set with the help of the protected presetting at the handwheel.

1. Remove locking ring.

2. Push handwheel and carry out presetting.

Cooling

Isolation

“Cocon QTZ” with actuator

Strainer

Dew point control

Room thermostat

3. Let handwheel snap back into the cogs and fit locking ring.

System illustration: Two pipe system

2015 Oventrop 3

Page 4

Pressure test points:

The flow meter “OV-DMC 2” can be connected to the pressure test points (model “Cocon QTZ” with pressure test points). This will confirm if the valve is working within the control range. The pump setting can be optimised by measuring the differential pressure.

For this purpose, the pump head is reduced until the hydraulically underprivileged valves are just working within the control range.

As the measured differential pressure is not equal to the minimum differential pressure (p1 – p3) for the valve design, the following charts must be used.

With a flow meter connected (e.g. “OV-DMC 2”), the differential pressure is measured across the flow unit. To do so, the pressure independent control valve must be fully opened (unscrew protection cap or set actuator to open position). As soon as the measured differential pressure is equal or higher than the differential pressure within the control range.

∆p

indicated in the chart, the valve works

DN 10/DN 15/DN 20 (150 l/h-1050 l/h) DN 20 (180 l/h-1300 l/h)

[mbar]

DN 10/DN 15/DN 20

∆p

Pressure independent control valve

Pressure test points

Maintenance:

The valve has to be serviced if malfunctions occur. The gland is replaceable under working conditions.

Cocon QTZ”

“

DN 20 (180 l/h-1300 l/h)

Measured differential pressure

Nominal setting [l/h]

DN 25/DN 32

[mbar]

∆p

DN 25

Nominal setting [l/h]

Measured differential pressure

Item no.

Control range

[l/h]

kvs-

value

without pressure test points

with pressure test points

measuring technique “classic”

male/male female/coupling female/female male/male female/coupling

10 30-210 0.5 1145563 – – 1146063 – 10 90-450 1.1 1145663 – – 1146163 – 15 30-210 0.5 1155564 1145504 1147504 1146064 1146004 15 90-450 1.1 1145664 1145604 1147604 1146164 1146104 15 150-1050 1.8 1145764 1145704 1147704 1146264 1146204 20 150-1050 1.8 1145566 1145506 1147506 1146066 1146006 20 180-1300 2.5 1145666 1145606 1147606 1146166 1146106 25 300-2000 4 1145668 1145608 1147608 1146168 1146108 32 600-3600 7.2 1145670 1145610 1147610 1146170 1146110

Models

4 2015 Oventrop

Page 5

One pipe heating system:

Configuration level of the one pipe heating system Advantages

1a Hydronic balancing of the one pipe heating system

Cap

1146091

“Cocon QTZ” DN 10-DN 32

“Cocon QTZ”

Pressure independent control valve

– Hydronic balancing by

constant volume flows in the one pipe heating risers

– The risers do not influence

each other

– No undersupply

1b Hydronic balancing + temperature setback of the dwelling unit

Digital

room thermostat

1152561/

1. Constant volume flows for each riser

1152562

Actuator

1012915/

1012916

“Cocon QTZ” DN 10-DN 32

2 Hydronic balancing + limitation of return temperature + minimum flow rate

“Uni RTLH”

1149068

Distance piece

1149090

“Cocon QTZ” DN 10-DN 32

by limitation of return temperature

2. Variable volume flows for each riser

Rooms supplied by the riser must belong to one dwelling unit!

– Hydronic balancing by

constant volume flows in the one pipe heating risers

– The risers do not influence

each other

– No undersupply

– Additional energy savings

by reduction of the volume flow and reduction of the heat loss during low demand periods, e.g. night setback

– Daily and weekly setback

periods programmable via a digital room thermostat

– Hydronic balancing by

constant volume flows in the one pipe heating risers

– The risers do not influence

each other

– No undersupply

– Energy savings by limitation

of the return temperature

– Room temperature control

is improved by the reduction of the volume flow during low demand periods as overheating is avoided

– Quick reactivation after

reduction to a minimum volume flow which is guaranteed by the distance piece

– Low return temperatures

(important for gross calorific appliances and district heating systems)

To be observed: The “Cocon QTZ” valves should not be installed in rooms which are sensitive to noise.

2015 Oventrop 5

Page 6

Insulation shells DN 15 – DN 32

Tender specification:

The insulation shells have a CFC-free inner core made of polyurethane rigid foam with a 1.5 mm plastic coat. They consist of two double shells which are tightened by two metal straps.

For heating and cooling systems. Building material class B2 according to DIN 4102. Operating temperature t

: -20°C up to +130°C

Sizes: Item no.:

DN 15 – DN 20 1149104 DN 20, model 180 – 1300 l/h 1149106

DN 25 – DN 32 1149108

Accessories:

Adapter with stem for “Cocon QTZ” 1149190 Extension = 25 mm Is required if the “Cocon QTZ” valves shall be equipped with

insulation shells and actuators.

“Cocon QTZ”

Pressure independent control valve

OVENTROP GmbH & Co. KG Paul-Oventrop-Straße 1 D-59939 Olsberg Germany Telephone +49(0)2962 82-0 Fax +49(0)2962 82- 450 E-Mail [email protected] Internet www.oventrop.de

DN L H H1 B B1 Item no.:

15/20 106 112 62 105 72 1149104

20* 116 125 69 120 82 1149106

25/32 166 169 101 154 97 1199108

Dimensions – *Model: 180 – 1300 l/h

Adapter with stem

For an overview of our global presence visit www.oventrop.de

Subject to technical modification without notice Product range 3 Gedruckt auf chlorfrei

ti 218-EN/10/MW Edition 2015 gebleichtem Papier.

6 2015 Oventrop