double regulating valves [2920w]

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HVAC Product Catalogue page 32

Double Regulating Valves ( DRV)

General Design & Application: The Double Regulating Valves are also called Balancing Valves. Econosto Double Regulating and Commissioning Valves are installed in the pipe work of chilled water air conditioning and hot water central heating systems as well as potable water systems and serve to achieve a hydronic balance between the various circuits of the system. The balance

is achieved by a pre-setting with memory position. The required values of pre-setting can be obtained from the flow charts. All intermediate values are infinitely adjustable. The selected pre-setting can be read-off two scales (basic scale and fine adjustment scale). The Econosto double regulating and commissioning valves have two threaded ports for fill and drain ball valves or pressure test points for the measurement of differential pressure. The Econosto double regulating and

commissioning valves are delivered with 2 blind plugs as a standard unless test points are requested. The Econosto double regulating and commissioning valves may be installed in either the supplyor the return pipe. The flow charts are valid for both cases provided the direction of flow conforms with the arrow marked on the valve body. Advantages of Econosto DRV’s: - One valve for 5 functions:

Pre-setting, measuring, isolating, filling and draining - Low pressure loss

Unique design and oblique pattern - Infinitely adjustable pre-setting

Exact measurement of pressure loss by means of the pressure test points.

- Patented measuring channel

designed around the stem assembly to the test points ensures the best possible accuracy between differential pressure measured at the pressure test points and the actual differential pressure of the valve.

Why do we need to Balance Air Conditioning Systems ? Balancing of heating and chilled water air conditioning systems is necessary to avoid thefollowing problems : 1. Some rooms almost never achieve the desired room temperature or are not cooled sufficiently.

This problem especially arises in case of influence of other heat sources.

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2. After changing over from low temperature to heating operation, parts of the system are onlyheated after a long time.

3. Fluctuating room temperatures especially arising during low demand periods. 4. High energy consumption although the required room temperature regulator is installed. Even high quality regulators may not solve this problem.

Distribution of flow : The main reason for these problems is that incorrect flows are available in thevarious circuits. If this is the case, the problem may be solved by installing adouble regulating and commissioningvalves or flow regulators in the corresponding pipes. The course of pressure in a circuit makes clear why this occurs.

total to guarantee a sufficient supply to appliance 4.This will however, inevitably result in a excessive differential pressure at the appliances 1 to 3 leading to an increased flow at these appliances and thus to an increased energy consumption. To remedy this, double regulating and commissioning are installed. The excess in differential pressure is now absorbed by the doubleregulating and commissioning valves. The desired flow rate may be controlled and set. To be able to control appliance 4 as well it is recommended to install a double regulating andcommissioning valve here too. The correct supply of each appliance is now guaranteed. Energy Saving :

The illustration shows that the pump has to produce a differential pressure of at least delta P -

Wrong flow rates in the various circuits lead to an increased energy consumption. On the one hand, a higher pump capacity must be provided to guarantee a sufficient supply of each appliance and on the other hand appliances being installed at a favourable hydronic position are then over supplied. This will result in an increased room temperature or, in chilled water air conditioning systems, in too low a room temperature.If the average temperature in a building exceeds the nominal value by 1 degree C, the energy consumption is increased by 6 - 10 % . In chilled water air conditioning systems , temperatures being 1 degree C too low will result in anincrease in energy consumption of about 15%. Note: Periodical maintenance is required (at least once in 6 months) for large diameter Balancing Valves (DRV’s of 200mm & above). It is suggested to open and close the balancing valves (DRV) a few times once in every 6 months to ensure that no contaminants are trapped with in the trim of the valve. It is also recommended to install another isolating valve (Wafer butterfly valves are recommended) on the discharge side of large size Balancing Valves (DRV) for any required maintenance or replacement of equipment or balancing valves.

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Fig 2920 W : Size 65mm (2 1/2")

Number of Rotations

Kv Value

Fig 2620 W : Size 80mm (3")

Double Regulating Valves

00 11 22 33 44 55 66 8800 9.09.0 14.514.5 22.722.7 33.133.1 44.744.7 59.959.9 74.574.5

7767.367.3

Kv Value according to VDI / VDE 2173. Kv Value : Flow in m /h at 1 bar headloss33

1 2 3 4 5 6 7 81.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

0 10 20 30 40 50 60 70 80

Pre

ssu

re D

rop

(bar

)

Flowrate (m / h)Flowrate (m / h)33

Kv Value according to VDI / VDE 2173. Kv Value : Flow in m /h at 1 bar headloss

125

1 2 3 4 5 6 7 81.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

25 50 75 100

Pre

ssu

re D

rop

(bar

)


0

Number of Rotations

Kv Value

00 11 22 33 44 55 66 8800 16.716.7 25.625.6 38.238.2 55.655.6 74.074.0 89.089.0 118.4118.4

77106.6106.6

33

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Fig 2920 W : Size 100mm (4")

Fig 2920 W : Size 125mm (5")


Number of Rotations

Kv Value

00 11 22 33 44 55 66 8800 25.025.0 48.748.7 71.471.4 104.0104.0 138.6138.6 163.2163.2 203.0203.0

77187.1187.1


1 2 3 4 5 6 7 81.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0 0 25 50 75 100 125 150 175 200

Pre

ssu

re D

rop

(bar

)


225


Number of Rotations

Kv Value

00 11 22 33 44 55 66 8800 33.733.7 57.257.2 71.471.4 91.091.0 115.5115.5 141.2141.2 178.5178.5

77159.9159.9

Number of Rotations

Kv Value

99 1010 1111 1212 1313 1414195.0195.0 213.6213.6 237.5237.5 257.8257.8 281.0281.0 296.2296.2

1 2 3 6 7 10 11 121.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 25 75 100 150 200 225 250

4 5 8 9 13 14

50 125 175 275 300

Pre

ssu

re D

rop

(bar

)


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Fig 2920 W : Size 150mm (6")

Number of Rotations

Kv Value


00 11 22 33 44 55 66 8850.050.0 80.180.1 92.892.8 112.5112.5 137.5137.5 169.8169.8 197.7197.7

77233.5233.5

Number of Rotations

Kv Value

99 1010 1111 1212 1313 1414270.3270.3 303.1303.1 338.7338.7 377.5377.5 399.2399.2 415.9415.9

00

1 2 3 6 7 10 11 121.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

0 50 100 150 200 250 300 350 400


4 5 8 9 13

14

Kv Value according to VDI / VDE 2173. Kv Value : Flow in m /h at 1 bar headloss

Fig 2920 W : Size 200mm (8")

Number of Rotations

Kv Value

00 11 22 33 44 55 66 8863.863.8 128.9128.9 161.0161.0 205.3205.3 254.9254.9 312.5312.5 375.7375.7

77420.5420.5

Number of Rotations

Kv Value

99 1010 1111 1212 1313 1414476.7476.7 537.1537.1 592.9592.9 655.4655.4 711.5711.5 759.3759.3

00

33Kv Value according to VDI / VDE 2173. Kv Value : Flow in m /h at 1 bar headloss

1 2 3 6 7 10 11 121.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 100 200 300 400 500 600 700 800

4 5 8 9 13 14


33

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Fig 2920 W : Size 250mm (10")

Number of Rotations

Kv Value


00 11 22 33 44 55 66 8853.353.3 65.565.5 88.888.8 131.5131.5 177.4177.4 224.1224.1 275.4275.4

77349.3349.300

Flowrate (m / h)Flowrate (m / h)33Flowrate (m / h)Flowrate (m / h)33

33Kv Value according to VDI / VDE 2173. Kv Value : Flow in m /h at 1 bar headloss

123 10 12 131.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 100 200 300 400 500 600 700 800

4 9 11 15 16


12 8 111.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

Pres

sure

Dro

p (b

ar)

7 10

800 950 1100

9 12


1000400 500 700600100 3002000

3 4 5 6 13 14 15 16 17 18

99425.7425.7

Number of Rotations

Kv Value

1010 1111 1212 1313 1414 1515 1616 1818590.5590.5 671.4671.4 755.2755.2 836.6836.6 901.0901.0 966.9966.9 1030.61030.6

17171058.81058.8505.9505.9

Fig 2920 W : Size 300mm (12")

Number of Rotations

Kv Value

00 11 22 33 44 55 66 8870.670.6 79.979.9 83.983.9 123.6123.6 176.1176.1 233.3233.3 307.5307.5

77416.3416.300

99566.4566.4

Number of Rotations

Kv Value

1010 1111 1212 1313 1414 1515 1616 1818924.4924.4 1049.01049.0 1130.31130.3 1182.21182.2 1222.21222.2 1276.91276.9 1340.31340.3

17171422.61422.6744.6744.6

19191459.51459.5

5 6 7 8 14 1817

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Presetting of Econ Balancing Valve Fig : 2920 W

6 64

CDBEA

Econ balancing valve are supplied with the suitable screw driver fixed to the hand wheel. The warning and instruction leaflet (sticker) is fixed on the body of each valve which provides clear instructions for valve operation. The number full revolutions is indicated on the linear scale “C”, fine adjustment is visible on the circular pitch “D” – one turn is divided into ten parts.

1) Remove the red plastic hand wheel cap “A”. 2) Close the valve completely & check if the linear scale “C” and circular pitch “D” indicate 0 – 0 ….adjustment. 3) Open the valve as required – set the number of full revolutions on the linear scale “C” and ….tenth of turn on the circular pitch “D”. 4) Insert enclosed screw driver “E” into the screw “B”, rotate the regulating screw anticlockwise to ….set the double regulating feature, a positive stop will be felt. 5) Put the cap “A” on the head of bolt “B”.

Maintenance Every part of the valve is designed in such a way that the whole valve is maintenance free. The materials are carefully matched with the parts to make the friction as small as possible. However, due to safety reasons, every valve should be inspected regularly. Before valve removal from the plant or before service the suitable part of the pipeline should be closed.

Installation Take off the plastic covers from the flanges. Blow inside valve by compressed air. The pipelineshould be placed in such a way that valve body does not carry bending moments nor tension forces. The linear scale and the plastic set should be protected against painting. The valves could be installed in every position in inlet and outlet pipelines with the hand wheel in down direction. Attention should be paid to flow direction indicated by the arrow on the valve body. Before starting pipeline work (especially after repairs) whole pipeline should be rinsed out by fully opening the valves in order to remove all solid residues which could be dangerous for sealing surfaces. Turning the hand wheel clockwise (according to direction indicated on the hand wheel) can close the valve. The valve is opened by anti-clockwise rotation of the hand wheel. It is prohibited to use additional lever for turning the hand wheel.

For presetting and fine adjustment of the flow volume (balancing), Econostooffers the PFM Flex3 - Pressure and Flow Measuring Instrument. The Econosto PFM Flex3 - Pressure and Flow Measuring Instrument is an advanced wireless operating precision instrument for measuring and data retention of flow in Heating, Cooling, and Drinking Water systems. (please refer page 43 of this catalogue for more details).

double regulating valves [2920w]

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