P. R2...P. Two. have. become. Range of Pressure-Independent Control Valves. one

Transcription

1 P. R2...P Two have become Range of Pressure-Independent Control alves one

2 The pressure-independent control valve R2 P sets new standards The challenge Energy savings with maximum convenience and low installation prices are requirements for the construction of new buildings and for renovations. Selecting the correct valves for the entire pipeline system and a professional hydraulic balancing costs money. alves are conventionally designed with a # n and the load. In the case of consumers (# 1) that are placed near the main pump, the differential pressure between the supply/ return pipes is much higher than at the end of the pipes (# n). With nominal volumetric flow, the necessary delivery height p p100 of the main pump depends on the selected pipe network (N and pipe lengths) and on the minimum differential pressure at the last consumer (pressure drop at the consumer and valve). P v 0,3 100 % P v 0,5 P v = 1 alve opening % alve authority P v The solution # 1 Pressure diagram at full load The pressure difference p #1 consists of the pressure drop at consumer T #1, valve #1 and the balancing valve #1. The valve #1 is fully opened here. If valve#1 p #n T #n s a result of the consistent further development of the tried-and-tested Belimo characterized control valve, the valve design has been simplified with the new pressure-independent control valve R2...P. The flow rate is constant, even when the valve closes and the differential pressure increases. The valve authority is 1, even with overdimensional valve sizes. T #1 #n #1 p p100 p #1 The advantages Example: Office building with several floors valve authority of 0.5 and installed before each consumer (e.g. air heater, heat exchanger, supply controls). However, pressure conditions vary depending on the installation site of the consumer #1 closes, the differential pressure can increase up to p #1, the valve authority sinks markedly, and the flow quantity increases disproportionately. Hydraulic balancing is no longer necessary. Equipping a building becomes simpler, and only one valve per consumer is needed. Since no more balancing valves are needed and the hydraulic balancing is eliminated, it is possible to save costs while at the same time increasing convenience. R2 P: the simplest way to control the flow rate Supply pressure Pressure-reducing control valve Control valve [l/s] 0,8 Flow rate 0 Flow diagram R220P Opening position 30 ifferential pressure 350 [kpa] (effective pressure) 100% 90% 80% 70% 60% 50% 40% Only one valve is needed per consumer: previously now 2

3 Principle of operation Cross-section of the pressure-independent control valve R2 P Simple direct mounting of the rotary actuator using a central screw, without shaft adapter Thermal decoupling of rotary actuator and control device Belimo characterizing disk for equal-percentage flow characteristic Pressure-reducing valve cone made of brass Identical mounting flange for all nominal widths, without lateral pressure on the stem ent window to prevent the accumulation of condensation Pressure-reducing cage made of elrin 500 Internal thread connection (BSP acc. to ISO 7/1) Stem with two 0-rings, blow-out proof Chrome-plated ball Forged fitting, nickelplated brass body Pressure-regulating diaphragm made of polyester-reinforced silicone Stainless spring (not visible) supports the pressureregulating diaphragm [] [B] Teflon seat with O-ring ensures leakage rate tight with low torque requirement Maintenance-free differential pressure measurement for the pressure-reducing valve Flow direction The characteristics The selection The corresponding drives The pressure-independent control valve R2...P contains two valves: the self-regulating pressure-reducing valve [] and the control valve [B] that works with equal percentage. When the differential pressure increases, the pressure-reducing valve closes and ensures a constant pressure over the control valve. This is necessary for the flow rate to remain constant ±5 % (at a differential pressure of kpa) with the current opening position of the control valve. The range of motorized, pressure-independent control valves comprises a practical spectrum. ll valves are: 2-way valves in the most common nominal widths (N 15 50) esigned for a flow rate of 0.09l/s to 3.78 l/s Optimum functionality of the Belimo pressure-independent control valve is ensured by the corresponding motorization. epending on the application, the pressure-independent control valves are supplied with different rotary actuators. You can choose from the LR... and NR... rotary actuators. epending on the type, they can be controlled by a modulating or 3-point control system. 3

4 imensioning imensioning diagram for pressure-independent control valves R2 P (scaling not linear) Type [l/s] [cl/s] R250P-378 esign In the case of classic control valves, the valves are selected k vs = 100 in m 3 /h. p v , ,5 150 R240P-252 / R250P-252 ➊ ➋ ps R240P-157 R232P-151 The decisive factor for the design of the pressure-independent control valve is the flow rate after the consumer or the heat exchanger. In the case of a maximum flow rate of < 2 m/s, the diameter of the pipe connector at the heat exchanger can be set equal to the diameter of R2...P (max. flow rate) R225P-098 R232P-101 0,5 50 0, R220P-066 R225P-057 R215P-036 / R220P-036 R215P ,3 0,5 1 1,5 2 2,5 3 3,5 ifferential pressure 1400 [kpa] 14 [bar] p Examples The flow rate through the pressure-independent control valve should be higher than through the consumer or heat exchanger: Example of an air cooler (throttling circuit) Legend ➊ The differential pressure of kp should be lower than the delivery pressure (delivery height) of the pump (HP) with nominal flow rate. If the delivery pressure of the pump (HP) is below the differential pressure, the flow rate decreases 100 = (R2 P) x 6x k vs 100 p v100 [m 3 /h] [m 3 /h] [bar] (R2 P) [l/s] p v p v100 ifferential pressure with fully opened control valve Nominal flow rate with p v100 ➋ If p over the R2 P is greater than the differential pressure of 350 kpa, the maximum flow rate decreases (by approx. 25% in relation to the given value). efinition ps = 1400 kpa Closing pressure at which the rotary actuator is still able to close the fitting tightly in relation to the corresponding leakage rate. Type designation R220P 036 Flow rate in cl/s Pressure-independent N in mm Two-way control valve with internal thread HP (valve) = (exchanger) 0.36 l/s > 0.34 l/s R220P-036 (Type) Example of an air preheater (injection circuit with 2-way valve) HP (valve) = (exchanger) 1.51 l/s > 1.25 l/s Q = 8.5 kw T = 6 K (exchanger) = 0.34 l/s Q = 105 kw T = 20 K (exchanger) = 1.25 l/s R232P-151 (Type) 4

5 Selection table Technical data of the pressure-independent control valves R2 P Type R2 P Nominal width N [mm] esign 2-way: inlet, outlet B Characteristic equal-percentage ( B) reas of application cold and warm water Temperature of medium +5 C 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 [N 15 32], 27 bar [N 40 50] Closing pressure ps 14 bar ifferential pressure kpa Rotary actuator LR... and NR... for pressure-independent control valves R2 P (modulating) Type LR24-SR NR24-SR NRY24-SR Nominal voltage C / C 24 uration 140 s approx s 35 s Control modulating, C 0 10 Operating range C 2 10 Position feedback C 2 10 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 C 24 C 230 uration 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 5

6 Ordering alve The range includes the pressure-independent control valve as well as the characterized control valve and the open/closed ball valve. Sizes: N15 to 50mm. ctuator types For motorizing valves, there are two rating classes of actuators available that are suitable for different power supplies and methods of control. Other versions and spring return actuators available on request. ssembling The prices quoted are per subassembly (valve and actuator). successful order willl need the following information: NEW: available as an option with individual pipe connectors supplied separately. ➀ alve 2-way The short price list is arranged as follows: 2-way pressure-independent control valve (for 2-way/ 3-way characterized control valves, see current price list) ➁ ssembling + ctuator fittedx Supplied separately The valves and actuators can be supplied as follows: ctuator fitted (+) alve/actuator separately (/) Separately at different times (on request) ➂ ctuator types The following data must be provided: LR rotary actuatorx NR rotary actuator Control modulating or 3-point Nominal voltage C / C 24, C 24 or C 230 ➃ Pipe connectors separately (option) /Z Separately The pressure-independent control valves are available as low-cost fittings with internal thread. s an option, the types R2..P are available with individual pipe connectors supplied separately (/Z). Ordering example: esignation: R225P-098+NR24-SR/Z Technical data: Page 8 ➀ alve type: ➀ ➁ ➂ ➃ esign 2-way pressure-independent control valve Size internal thread BSP 1, N 25 Flow volume = 0.98 l/s ➁ ssembling ➂ ctuator: Nominal voltage Control type Running time ➃ Pipe connectors (option): actuator fitted rotary actuator C/C 24 modulating 140 s 2 x ZR2325 separately (for prices, see current price list) 6

7 BC 7

8 ata Selection [l/s] N [mm] [inches] Technical data R2...P pressure-independent control valve Type R215P-009 R215P-036 R220P-036 R220P-066 R225P-057 R225P-098 R232P-101 R232P-151 R240P-157 R240P-252 R250P-252 R250P-378 Suitable rotary actuator modulating C 0 10 LR24-SR (C/C 24) NR(Y)24-SR (C/C 24) Emergency control function (rotary actuators with spring) on request R2...P pressure-independent control valve Suitable rotary actuator 3-point NR24-3(-S) (C 24) NR230-3(-S) (C 230 ) Medium cold and pump water, water with 50% volume of glycol Temp. of medium +5 C 100 C, lower temp. on request Rated pressure 4140 kpa (R215P R232P) / 2760 kpa (R240P R250P) Flow characteristic equal percentage (following E 2173) Rangeability N 15 Sv > 50 N Sv > 100 Leakage rate air-bubble-tight Pipe connector internal thread acc. to ISO 7/1 ifferential pressure kpa Closing pressure ps 1400 kpa ngle of rotation 90 Installation position standing to lying (in relation to the stem) Maintenance maintenance-free Material Fitting nickel-plated, hot-pressed brass Ball chrom-plated brass Seal PTFE Stem chrom-plated brass Stem seal EPM O-ring Characterizing disk TEFZEL alve cone stainless steel Cage elrin 500 F iaphragm polyester-reinforced silicone Spring for valve cone stainless steel pplications Water-side control of air handling apparatus in ventilation and air-conditioning plants Water-side control in heating plants Mode of operation The pressure-independent control valve is motor-operated by a type LR or NR rotary actuator. The actuators are controlled by a standard modulating or 3-point control system and move the ball of the pressureindependent control valve, the throttling element, to the opening position dictated by the control signal. Product features 2-way pressure-independent control valve N For the modulating control of cold and hot water Equal-percentage characteristic Equal-percentage characteristic of the flow ensured by the integrated characterizing disk. Constant flow volume with a differential pressure of kpa, thanks to the integrated pressure-reducing valve. valve authority of 1 is attained, regardless of the differential pressure before and after the valve. Even in the part-load range, the flow rate remains constant with each opening position (angle of rotation) and ensures a steady control. Manual operation by lever after disengaging the gearing latch on the type LR... or NR... rotary actuator. The pressure-independent control valve R2... P is ordered together with the corresponding 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 8

9 imensions Sizes R2...P pressure-independent control valve imensions Max. thread N [mm] G Thread screwing depth [mm] [inches] B C E [kg] Rp [mm] C B E 9

10 Installation and dimensions with rotary actuators LR The pressure-independent control valve R2 P with LR... rotary actuator LR... rotary actuators The compact LR... rotary actuator is specially designed for the motorization needs of pressure-independent control valves up to N 32. In particular, it has the following advantageous 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 imensions of complete actuator set R2...P and LR... Installation of R2...P and rotary actuator LR... CCW min LR H 83 min. 200 CCW 4x90 C Rp F B E imensions N Thread [mm] B [mm] [inches] Rp B C E F H B=100% 10

11 Installation and dimensions with rotary actuators NR The pressure-independent control valve R2 P with NR... rotary actuator NR... rotary actuators The powerful NR... rotary actuator is suitable for the reliable motorization of pressure-independent control valves up to N 50. It offers the following application advantages: Modulating or 3-point control Temporary and permanent 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 If desired, with auxiliary switch, adjustable, floating imensions of complete actuator set R2...P and NR... Installation of R2...P and rotary actuator NR min CCW 1 0 NR min. 250 CCW 42 C Rp H B F E imensions N Thread [mm] [mm] [inches] Rp B C E F H B=100% B 11

12 ir applications Water applications Standard actuators and spring-return actuators for air control dampers in HC systems Safety actuators for motorizing fire and smoke extraction dampers systems for individual room air control Mixing actuators and motorized ball valves for HC water circuits Globe valves and intelligent linear actuators also for leading makes of valve Innovation, Quality and Consultancy: partnership for motorizing HC actuators Belimo is represented in over 60 countries throughout the world. isit our website for the addresses. ENG pdf. KS. Subject to technical modifications