P. R2...P

Range of Pressure-Independent Control Valves

Two

havebecome

one

2

The pressure-independent control valve R2…P setsnew standards

The challenge

Energy savings with maximum convenienceand low installation prices are require-ments for the construction of new buil-dings and for renovations. Selecting thecorrect valves for the entire pipelinesystem and a professional hydraulicbalancing costs money. Valves are conventionally designed with a

valve authority of 0.5 and installed beforeeach consumer (e.g. air heater, heatexchanger, supply controls).However, pressure conditions vary depend-ing on the installation site of the consumer

and the load. In the case of consumers (# 1)that are placed near the main pump, the dif-ferential pressure between the supply/return pipes is much higher than at the endof the pipes (# n). With nominal volumetricflow, the necessary delivery height ∆pp100

of the main pump depends on the selec-ted pipe network (DN and pipe lengths)and on the minimum differential pressureat the last consumer (pressure drop at theconsumer and valve).

Pressure diagram at full load

The pressure difference ∆p #1 consists of the pressure drop at consumer T #1,valve V #1 and the balancing valve D #1.The valve V#1 is fully opened here. If valve#1

closes, the differential pressure canincrease up to ∆p #1, the valve authoritysinks markedly, and the flow quantityincreases disproportionately.

The solution

As a result of the consistent further deve-lopment of the tried-and-tested Belimocharacterized control valve, the valvedesign has been simplified with the newpressure-independent control valveR2...P. The flow rate is constant, evenwhen the valve closes and the differentialpressure increases. The valve authority is1, even with overdimensional valve sizes.

The advantages

Hydraulic balancing is no longer neces-sary. Equipping a building becomes simp-ler, and only one valve per consumer isneeded. Since no more balancing valvesare needed and the hydraulic balancing iseliminated, it is possible to save costs while –at the same time – increasing convenience.

# 1

# n

D

D

D

V

V

D V

D V

D VV

∆p p100 ∆p #1

T #1

V #1

D #1

T #n

V #n

∆p #n

0 100 %

100 %

VPv ≈ 0,3

Pv ≈ 0,5

Pv = 1

Example: Office building with several floors

30 Differential pressure 350 [kPa](effective pressure)

Flow

rat

e

Flow diagram R220P Only one valve is needed per consumer:

previously now

R2…P: the simplest way to control the flow rate

Pressure-reducing Control valvecontrol valve

Supplypressure

Valve authority Pv

Valve opening

Openingposition

100%90%80%70%60%50%40%

[l/s]0,8

0

3

Principle of operation

The characteristics

The pressure-independent control valveR2...P contains two valves: the self-regu-lating pressure-reducing valve [A] and thecontrol valve [AB] that works with equalpercentage. When the differential pressureincreases, the pressure-reducing valvecloses and ensures a constant pressureover the control valve. This is necessaryfor the flow rate to remain constant ±5 %(at a differential pressure of 30…350 kPa)with the current opening position of thecontrol valve.

The selection

The range of motorized, pressure-inde-pendent control valves comprises a practical spectrum. All valves are:

• 2-way valves in the most common nomi-nal widths (DN 15…50)

• Designed for a flow rate of 0.09l/s to 3.78 l/s

The corresponding drives

Optimum functionality of the Belimo pressure-independent control valve isensured by the corresponding motori-zation. Depending on the application, thepressure-independent control valves aresupplied with different rotary actuators.You can choose from the LR... and NR...rotary actuators. Depending on the type,they can be controlled by a modulating or3-point control system.

Identical mounting flange for allnominal widths, without lateralpressure on the stem

Stem with two 0-rings,blow-out proof

Chrome-plated ball

Teflon seat with O-ringensures leakage ratetight with low torquerequirement

Maintenance-freedifferential pressuremeasurement for thepressure-reducing valve

Vent window to prevent theaccumulation of condensation

Simple direct mounting of the rotary actuator usinga central screw, without shaft adapter

Flow direction

[AB]

[A]

Cross-section of the pressure-independent control valve R2…P

Thermal decoupling of rotary actuator andcontrol device

Belimo characterizing disk for equal-percentage flow characteristic

Pressure-reducing valve cone made of brass

Pressure-reducing cage made ofDelrin 500

Internal thread connection(BSP acc. to ISO 7/1)

Forged fitting, nickel-plated brass body

Pressure-regulating diaphragmmade of polyester-reinforcedsilicone

Stainless spring (not visible)supports the pressure-regulating diaphragm

4

0 ∆p

V

[l/s] [cl/s]4 400 R250P-378

R232P-151

R220P-066

R240P-157

R215P-009

30 50 100 150 200 250 300 350

0,3 0,5 1 1,5 2 2,5 3 3,5

1400 [kPa]

14 [bar]

➊ ➋ ∆ps

0,1 10

0,5 50

1 100

2 200

3 300

2,5 250

1,5 150

R225P-057

R215P-036 / R220P-036

R225P-098 R232P-101

R240P-252 / R250P-252

Closing pressure at which the rotary actuator isstill able to close the fitting tightly in relation tothe corresponding leakage rate.

Definition∆ps = 1400 kPa

Type designation

R220P–036

Flow rate in cl /s

Pressure-independent

DN in mm

Two-way control valve withinternal thread

Legend➊The differential pressure of 30...350 kPAshould be lower than the delivery pressure(delivery height) of the pump (HP) withnominal flow rate. If the delivery pressureof the pump (HP) is below the differentialpressure, the flow rate decreases

kvs [m3/h]

V100 [m3/h]

∆pv100 [bar]

V (R2…P) [l /s]

∆pv100 Differential pressure with fullyopened control valve

V100 Nominal flow rate with ∆pv100

➋If ∆p over the R2…P is greater than the dif-ferential pressure of 350 kPa, the maximumflow rate decreases (by approx. 25% inrelation to the given value).

∆pv100V100 = V(R2…P) x 6x

Differential pressure

— Type —

DesignIn the case of classic control valves, thevalves are selected kvs = in m3/h.

The decisive factor for the design of thepressure-independent control valve is theflow rate after the consumer or the heatexchanger.In the case of a maximum flow rate of < 2 m/s, the diameter of the pipe connectorat the heat exchanger can be set equal tothe diameter of R2...P (max. flow rate).

ExamplesThe flow rate through the pressure-inde-pendent control valve should be higherthan through the consumer or heatexchanger:

Example of an air cooler (throttling circuit)

V(valve) = V(exchanger)

0.36 l /s > 0.34 l/s

R220P-036 (Type)

Example of an air preheater (injection circuit with 2-way valve)

V(valve) = V(exchanger)

1.51 l /s > 1.25 l/s

R232P-151 (Type)

V100

∆pv100

HP

Q = 8.5 kW∆T = 6 KV(exchanger) = 0.34 l/s

HP

Q = 105 kW∆T = 20 KV(exchanger) = 1.25 l /s

Dimensioning

Dimensioning diagram for pressure-independent control valves R2…P

(scaling not linear)

5

Selection table

Technical data of the pressure-independent control valves R2…P

Rotary actuator LR... and NR... for pressure-independent control valves R2…P (modulating)

Nominal width DN [mm] 15...50 •Design 2-way: inlet A, outlet AB •Characteristic equal-percentage (A–AB) •Areas of application cold and warm water •Temperature of medium +5°C...+100°C (lower medium temperatures on request) •Material housing nickel-plated brass •

ball and spindle chrome-plated brass •Connections Internal thread BSP (ISO 7/1) •Rated pressure 41 bar [DN 15…32], 27 bar [DN 40…50] •Closing pressure ∆ps 14 bar •Differential pressure 30…350 kPa •

Type R2…P

Type LR24-SR NR24-SR NRY24-SR

Nominal voltage AC / DC 24V • • •Duration 140 s •

approx. 80…110 s •35 s •

Control modulating, DC 0…10V • • •Operating range DC 2…10V • • •Position feedback DC 2…10V • • •Manual override temporary • • •

permanent • •Connection cable 1 m • • •

Integrated screw terminals • •

Other versions and spring return actuators available on request

Rotary actuator NR... for pressure-independent control valves R2…P (3-point)

Type NR230-3 NR230-3-S NR24-3 NR24-3-S

Nominal voltage AC 24V • •AC 230V • •

Duration 140 s • • • •Control 3-point • • • •1 auxiliary switch adjustable, floating • •Manual override temporary • • • •

permanent • • • •Connection cable 1m • • • •

integrated screw terminals • • • •

Other versions and spring return actuators available on request

6

Ordering

Ordering example:

Technical data: Page 8

Designation: R225P-098+NR24-SR/Z

➀ Valve type:

Design 2-way pressure-independent control valveSize internal thread BSP 1”, DN 25Flow volume V = 0.98 l /s

➁ Assembling actuator fitted

➂ Actuator:

Nominal voltage rotary actuator AC/DC 24 VControl type modulatingRunning time 140 s

➃ Pipe connectors (option): 2 x ZR2325 separately (for prices, see current price list)

➀ ➁ ➂ ➃

2-way

LR rotary actuatorX NR rotary actuator

Actuator fittedX Supplied separately

➀ Valve

➁ Assembling

➂ Actuator types

The short price list is arranged as follows:

• 2-way pressure-independent controlvalve(for 2-way/3-way characterized controlvalves, see current price list)

The following data must be provided:

• Control modulating or 3-point• Nominal voltage AC / DC 24 V,

AC 24 V or AC 230 V

➃ Pipe connectorsseparately (option)

The valves and actuators can be suppliedas follows:

• Actuator fitted (+)• Valve/actuator separately ( / )• Separately at different times (on

request)

+

Separately

The pressure-independent control valvesare available as low-cost fittings with internal thread.

• As an option, the types R2..P areavailable with individual pipe connec-tors supplied separately ( /Z).

/Z

Valve

The range includes the pressure-indepen-dent control valve as well as the characte-rized control valve and the open/closedball valve. Sizes: DN15 to 50mm.

Actuator types

For motorizing valves, there are two ratingclasses of actuators available that are sui-table for different power supplies andmethods of control.

Other versions and spring return actuatorsavailable on request.

Assembling

The prices quoted are per subassembly(valve and actuator).

A successful order willl need the followinginformation:

NEW: available as an option with indivi-dual pipe connectors supplied separa-tely.

BC

7

8

Data

Medium cold and pump water, water with50% volume of glycol

Temp. of medium +5°C…100°C, lower temp. on requestRated pressure 4140 kPa (R215P…R232P) / 2760 kPa (R240P…R250P)Flow characteristic equal percentage (following VDE 2173)Rangeability DN 15 Sv > 50

DN 20…50 Sv > 100Leakage rate air-bubble-tightPipe connector internal thread acc. to ISO 7/1Differential pressure 30…350 kPaClosing pressure ∆ps 1400 kPaAngle of rotation 90°Installation position standing to lying (in relation to the stem)Maintenance maintenance-freeMaterialFitting nickel-plated, hot-pressed brassBall chrom-plated brassSeal PTFEStem chrom-plated brassStem seal EPDM O-ringCharacterizing disk TEFZELValve cone stainless steelCage Delrin 500 AFDiaphragm polyester-reinforced siliconeSpring for valve cone stainless steel

Applications· Water-side control of air handling appa-

ratus in ventilation and air-conditioningplants

· Water-side control in heating plants

Mode of operationThe pressure-independent control valve ismotor-operated by a type LR or NR rotaryactuator. The actuators are controlled by astandard modulating or 3-point controlsystem and move the ball of the pressure-independent control valve, the throttlingelement, to the opening position dictatedby the control signal.

Product features

Equal-percentage characteristic of theflow ensured by the integrated characteri-zing disk.

Constant flow volume V with a differentialpressure of 30...350 kPa, thanks to theintegrated pressure-reducing valve. A valveauthority of 1 is attained, regardless of thedifferential pressure before and after thevalve.Even in the part-load range, the flow rateremains constant with each openingposition (angle of rotation) and ensures asteady control.

Manual operation by lever after disenga-ging the gearing latch on the type LR... orNR... rotary actuator.

The pressure-independent control valveR2... P is ordered together with the corre-sponding rotary actuator LR... or NR...

Ordering examples: (with NR24-SR)

a) R240P-252 with NR24-SR – rotary actuator fitted– order code: R240P-252+NR24-SR

b) R240P-252 with NR24-SR– rotary actuator supplied separately– order code: R240P-252/NR24-SR

2-way pressure-inde-pendent control valveDN 15...50

For the modulatingcontrol of cold and hotwater

Equal-percentage characteristic

Selection R2...P pressure-independent control valve

Technical data R2...P pressure-independent control valve

V[l /s]

DN

[mm] [inches]Type

Suitable rotary actuatormodulating DC 0…10V

Suitable rotaryactuator 3-point

151520202525323240405050

R215P-009R215P-036R220P-036R220P-066R225P-057R225P-098R232P-101R232P-151R240P-157R240P-252R250P-252R250P-378

0.090.360.360.660.570.981.011.511.572.522.523.78

1⁄2”1⁄2”3⁄4”3⁄4”1”1”

11⁄4”11⁄4”11⁄2”11⁄2”2”2”

LR24-SR(AC/DC 24V)

Emergency control function (rotary actuators with spring) on request

NR24-3(-S)(AC 24V)

NR230-3(-S)(AC 230 V)

NR(Y)24-SR(AC/DC 24V)

9

Dimensions

A

B

C

D

Dimensions Max. threadDN [mm] G Thread screwing depth

[mm] [inches] A B C D E [kg] Rp [mm]15 1⁄2” 122 116 101 58 57 0.4 1⁄2” 1320 3⁄4” 134 128 106 59 57 0.4 3⁄4” 1325 1” 179 179 122 75 82 0.65 1” 1732 1 1⁄4” 179 179 122 75 82 0.65 1 1⁄4” 1940 1 1⁄2” 204 204 144 93 78 0.75 1 1⁄2” 1950 2” 216 216 150 93 78 0.95 2” 22

E

Sizes R2...P pressure-independent control valve

10

Installation and dimensions with rotary actuators LR…

LR... rotary actuators

The compact LR... rotary actuator is speci-ally designed for the motorization needs ofpressure-independent control valves up toDN 32. In particular, it has the followingadvantageous characteristics:

• Modulating control • Temporary disengagement allows

manual operation• Central fixing bolt for simple mounting• Clear indication of position• Installation possible in 4 positions• Low space requirements due to

compact dimensions• 1 m long, pre-fitted connecting lead

The pressure-independent control valve R2…Pwith LR... rotary actuator

A-AB=100%

AB

A

4x90°

CCW

10

CCW

A

Installation of R2...P and rotary actuator LR...

Dimensions of complete actuator set R2...P and LR...

664018 min. 70

134

H83

59

min

. 200

42

LR...

Rp

EA

F

B

C

DimensionsDN Thread [mm]

[mm] [inches] Rp A B C E F H15 1⁄2” 1⁄2” 122 116 101 57 41 4520 3⁄4” 3⁄4” 134 128 106 57 48 4825 1” 1” 179 179 122 82 63 4832 1 1⁄4” 1 1⁄4” 179 179 122 82 63 48

11

Installation and dimensions with rotary actuators NR…

NR... rotary actuators

The powerful NR... rotary actuator is suitable for the reliable motorization ofpressure-independent control valves up toDN 50. It offers the following applicationadvantages:

• Modulating or 3-point control• Temporary and permanent dis-

engagement allows manual operation• Central fixing bolt for simple mounting• Clear indication of position• Installation possible in 4 positions• Low space requirements due to com-

pact dimensions• 1 m long, pre-fitted connecting lead• If desired, with auxiliary switch,

adjustable, floating

A-AB=100%

AB

A

CCW

10

CCW

A

Installation of R2...P and rotary actuator NR...

Dimensions of complete actuator set R2...P and NR...

80

3393

H

114.

5

min

. 250NR...

42

min. 70

Rp

EA

F

B

C

DimensionsDN Thread [mm]

[mm] [inches] Rp A B C E F H

15 1⁄2” 1⁄2” 122 116 101 57 41 4520 3⁄4” 3⁄4” 134 128 106 57 48 4825 1” 1” 179 179 122 82 63 4832 1 1⁄4” 1 1⁄4” 179 179 122 82 63 4840 1 1⁄2” 1 1⁄2” 204 204 144 78 65 5150 2” 2” 216 216 150 78 69 57

The pressure-independent control valve R2…Pwith NR... rotary actuator

EN

G –

03.

04 –

pd

f .

KS

. S

ubje

ct t

o te

chni

cal m

odifi

catio

ns

Belimo is represented in over 60 countries throughout the world.Visit our website www.belimo.ch for the addresses.

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