Double Reg Valves.pdf

7/27/2019 Double Reg Valves.pdf

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Section 4 : Double Regulating Valves

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ECONOSTO - 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 pipework of chilled water air

conditioning and hot water central heating systems as well as pottable 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 supply or 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 DRVs:

- 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 the following 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.

2. After changing over from low temperature to heating operation, parts of the system are only heated 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 the various circuits. If this is the case,

the problem may be solved by installing a double regulating and commissioning valves or flow regulators in the

corresponding pipes. The course of pressure in a circuit makes clear why this occurs.


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The illustration shows that the pump has to produce a differential pressure of at least delta P - 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 double regulating 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 and commissioning valvehere too. The correct supply of each appliance is now guaranteed.

Energy Saving :

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 an increase

in energy consumption of about 15%.

Course of pressure in circuit


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ECON Bronze DoubleRegulating Valve, VariableOrifice; PN 25, Fig: 2601V

Specification:Bronze Double Regulating and Commissioning

Valve, Y pattern, Threaded ends to BS 21(BSPP),

PN 25 rated, Variable Orifice with linear

scale and circular scale (fine adjustment).

Maintenance free valve.

Low flow resistance due to unique design.

Complies to BS 7350 accuracy requirements.

Tight closure of valve is assured by use

of PTFE disc insert.

Hand wheel embraces a vernier scale for

accurate setting.

Valves have unique design which enables the

disc to be locked in the set position.

Valve can be sealed in the set position with the

sealing wire and lead seal.

Two points (inlet/outlet) are available on the body

of the DRV (Fig: 2601V). These points are for fixing

the measuring nipples or test plugs for the

measurement of flow / delta P (balancing).

Hydrostatic Test Pressure:Body : 37.5 barSeat : 27.5 bar

Pressure / Temperature Rating:25 bar at -10 to 120 Deg. C

Size Wt.

Inches mm mm m3/hr. Kg.

D L H Kv (Open)

1/2 90 90 2.6 0.46

3/4 102 90 4.3 0.52

1 110 90 6.6 0.66

11/4 121 116 14.5 0.96

11/2 142 116 22.5 1.31

2 161 116 33.1 1.88

Material Specification:

No. Component Material DIN BS

1 Body Bronze G-CuSn5ZnPb 1400LG2

2 Stem DZR Brass - 2874 CZ132

3 Disc DZR Brass - 2874 CZ132

4 Bonnet DZR Brass - 2874 CZ132

5 Seat Ring PTFE - -

6 O-Ring EPDM - -

7 Cap / Knob ABS - -

Dimensions and Weights:

Dimensions (millimeters)

**

**

Flowrate :

Brass Test Nipple Brass self closing Test Plug

DRV with Test Nipple or Test Plug

Fig: 2601V


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Specification:Double Regulating and Commissioning

Valves. Conforms to BS 5152 (EN13789).

Y pattern,Flanged to BS 4504 / DIN PN 16

(EN1092). Variable Orifice with linear scale

and circular scale (fine adjustment).

Maintenance free valve


Complies to BS 7350 requirements

Tight closure of valve is assured by use ofsoft seating.

Hand wheel embraces a vernier scale

for accurate setting.

Valves have unique design which enables

the disc to be locked in the set position

with a screwdriver.

Valve is supplied with a screw driver

secured to the hand wheel.

Two points (inlet/outlet) are available on

the body of the valve for fixing the measuring

nipples / test plugs for measurement of flow

/ delta P(balancing).


ECON Cast Iron Double

Regulating Valve, Variable

Orifice; PN 16, Fig: 2920W


No. Component Material DIN BS1 Body Cast Iron 1691GG25 1452GR260

2 Disc C I + EDPM Coated 1691GG25 1452GR260

3 Disc Nut Brass CuZn39Pb2 2874-CZ121

4 Stem Stainless Steel X10GR13 410S21

5 O-Ring EPDM CuSn 5ZnPb 1400LG2

6 Bonnet Cast Iorn 1691GGLS 1452GR260

7 Gasket Graphite - -

8 Hand Wheel GGG40 + Epoxy Coating - -

9 Gland Carbon Steel - -

10 Nut ASTM B 16 - -

11 Position indicator Plastic - -

12 Adjusting Bolt ASTM B 16 - -

13 Bolt Carbon - -

Fig: 2920W

Nom. Size

DN D L H W

Dimensions (millimeters)


KgWeight

65 180 290 293 18

80 180 310 305 23

100 180 350 323 33.5

125 250 400 353 49

150 250 480 388 62

200 250 600 453 96

mm mm mm mm

Hydrostatic Test Pressure:Body : 24 bar

Seat : 17.6 bar

Face to Face Dimensions:

EN 558 - 1 Basic Series 1.

Pressure / Temperature Rating:16 bar at -10 to 120 Deg. C

Maximum Differential Pressure:DN 65 - DN 200 : 16 bar

Note:2920W is supplied with a screw

driver tied to the handwheel.

NEW


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Specification:Double Regulating and Commissioning

Valves. Conforms to BS 5152 (EN13789).

Y pattern,Flanged to BS 4504 / DIN PN 16

(EN1092). Variable Orifice with linear scale

and circular scale (fine adjustment).

Maintenance free valve


Complies to BS 7350 requirements

Tight closure of valve is assured by use ofsoft seating.

Hand wheel embraces a vernier scale

for accurate setting.

Valves have unique design which enables

the disc to be locked in the set position

with a screwdriver.

Valve is supplied with a screw driver

secured to the hand wheel.

Two points (inlet/outlet) are available on

the body of the valve for fixing the measuring

nipples / test plugs for measurement of flow

/ delta P(balancing).


Dimensions (millimeters)Nom. Size

HLDND

KgWeight

W

195

315

575

645

730

850

420

420

250

300

mm mm mm mm

Fig: 2920W


No. Component Material DIN BS

1 Body Cast Iron 1691GG25 1452GR260

2 Disc SS + EDPM Ring

3 Disc Nut Brass CuZn39Pb2 2874-CZ121

4 Stem Stainless Steel X10GR13 410S21

5 O-Ring EPDM CuSn 5ZnPb 1400LG2

6 Bonnet Cast Iorn 1691GGLS 1452GR260

7 Gasket Graphite - -

8 Hand Wheel GGG40 + Epoxy Coating - -

9 Gland Carbon Steel - -

10 Nut ASTM B 16 - -

11 Position indicator Plastic - -

12 Adjusting Bolt ASTM B 16 - -

13 Bolt Carbon - -

Hydrostatic Test Pressure:Body : 24 barSeat : 17.6 barFace to Face Dimensions:EN 558 - 1 Basic Series 1.

Pressure / Temperature Rating:16 bar at - 10 to 120 Deg. C

Maximum Differential Pressure:DN 250 : 6 barDN 300 : 4 bar

Note:2920W is supplied with a screw driver tied to thehandwheel.

ECON Cast Iron Double

Regulating Valve, Variable

Orifice; PN 16, Fig: 2920W


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PFM 2000Portable meter for measuring flow and pressure difference across Double Regulating valves.Description:

The PFM 2000 is a precision instrument for measuring pressure and flow (PFM = Pressure Flow Meter). It isdesigned for use in monitoring and documenting water flow in heating and cooling installations, (the PFM 2000

measures across the balancing valves in such installations).The instrument is built around a sensor with two interacting ceramic membranes which detect pressure differencesacross the balancing valve. This is a new system and operates by balancing, at a basic physical level, the plus andminus sides of the measuring membranes. The pressure differential range is factory calibrated to cover pressuresfrom 0 to 1.5 bar (150 kPa). The storage case containing the PFM 2000 and all accessories is as below.

TECHNICAL SPECIFICATION

Measurement range:Differential pressure: upto 150 kPa

at total pressure upto 1000 kPamax 2000 kPa

Static Pressure upto 1000 kPa

Resolution:Differential pressure: 0.01 kPa, at total pressure 100 kPa

Static Pressure 10 kPaFlow: 0.001 1/sAccuracy:Differential pressure: 10 kPa 1% of metered valueFlow: As for pressure + the valves deviationEnvironment:

Temperature, media: -10C to 100CTemperature, storage: -20C to 60CHumidity, (non-condensing): max 90% RH

Power supply:Capacity: 1500 mAhR6 rechargeable NiMH batteries (6)

The PFM 2000 (new) package comprises:

Part: Quantity:Digital Meter (electronic) 1Sensor unit 1Cable between meter and sensor unit 1Hoses and connectors 2Battery charger 1Storage case with carrying strap 1Operating Manual 1Calibration protocol (Certificate) 1Connecting probes 2Allen key - 3mm 1Allen key - 5mm 1

Model PFM 2000


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Knob setting / No. of turns

1.0 - to - 4.0


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Number ofRotations

0 1 2 3 4 5 6 7 8

0 9.0 14.5 22.7 33.1 44.7 59.9 67.3 74.5Kv-value


ECON BALANCING VALVE FIG.2920W : SIZE 65 mm

Kv-value according to VDI/VDE 2173Kv-value : flow in m3 / h at 1 bar headloss.

Number ofRotations

0 1 2 3 4 5 6 7 8

0 16.7 25.6 38.2 55.6 74.0 89.0 106.6 118.4Kv-value


Kv-value according to VDI/VDE 2173

Kv-value : flow in m3 / h at 1 bar headloss.

NEW


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Number ofRotations

0 1 2 3 4 5 6 7 8

0 25.0 48.7 71.4 104.0 138.6 163.2 187.1 203.0Kv-value




Number ofRotations

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

0 33.7 57.2 71.4 91.0 115.5 141.2 159.9 178.5 195.0 213.6 237.5 257.8 281.0 296.2Kv-value



NEW


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Number of

Rotations0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

0 50.00 80.1 92.8 112.5 137.5 169.8 197.7 233.5 270.3 303.1 338.7 377.5 399.2 415.9Kv-value



Number ofRotations

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

0 63.8 128.9 161.0 205.3 254.9 312.5 375.7 420.5 476.7 537.1 592.9 655.4 711.5 759.3Kv-value





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Number of

Rotations

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

0 65.553.0 88.8 131.5 177.4 224.1 275.4 349.3 425.7 505.9 590.5 671.4 755.2 836.6 901.0 966.9 1030.6 1 058.8Kv-value

Number ofRotations

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

0 79.970.6 83.9 123.6 176.1 233.3 307.5 416.3 566.4 744.6 924.4 1049.0 1130.3 1182.21222.2 1276.91340.3 1422.6

19

1459.5Kv-value







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Presetting of ECON - PN25 Balancing valve Fig. 2601V

Econosto DRV and commissioning valves are deigned for installation in hot water heating and chilled water air

conditioning systems and served to achieve a hydronic balance between the various circuits of the system. It is

important to note that the direction of flow must conform with the direction of the arrow on the valve body

and that the valve must be installed with a minimum of 3 D (3 x nominal pipe diameter) straight pipe in the

upstream side. The required preset value van be obtained by reference to the flow chart appropriate for the size

of valve. Any intermediate preset value is available. The selected preliminary setting can be made from the two-

part scale - the basic scale and the fine adjustment scale.

Presetting :

1. The preset valve of the valve is adjusted with the handwheel.

a. The display of the basic setting is shown in the lower windows by the sliding indicator.

Each turn of the handwheel is represented by a number inside the window.

b. The display of the fine setting is shown in the handwheel windows scale and each number indicates 1/10th

of a turn of the handwheel.

2. Carefully remove the cover plug in the centre of the handwheel by using a small screwdriver in the slot and

gently prising it off.

3. With the valve at the required preset value,using a 3 mm allen key, turn the inner screw clockwise until it seats.

The inner screw is located in the hole through the nut. The 3 mm allen key is supplied along with every valve.

4. Refit the cover plug.

Protecting the setting:

A sealing wire may be threaded through the hole in the handwheel and a lead seal fitted.

For presetting and fine adjustment of the flow volume (balancing), Econosto offers thePFM 2000 - Pressure and Flow Measuring Instrument.

The Econosto PFM-2000 - Pressure and Flow Measuring Instrument is an advanced programmable microprocessor

with memory store (please refer page 32 of this catalogue for more details).


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Presetting of ECON Balancing valve Fig 2920W

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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.

MaintenanceEvery 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 pipeline should be placed insuch 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 pipelinework (especially after repairs) whole pipeline should be rinsed out by fully opeing 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 roation of the hand wheel. It is prohibited to use additional lever for turning the hand wheel.

For pressure and fine adjustment of the flow volume (balancing), Econosto offers the PFM- 2000 / 2050 pressure and

flow measurement instrument.

The econosto PFM 2000 / 2050 pressure and flow measuring instrument advance programmable microprocessor.

Documents

Double Reg Valves.pdf