Pressure Independent Control Valve

Transcription

1 Pressure Independent Control Valve Pn16 High capacity Warren Controls Pressure Independent Control Valve with the authority to maximize stability, efficiency and energy savings. PICV PS _B 1110

2 TABLE OF CONTENTS Operation... 1 Control Valve Authority... 2 Performance... 3 Configurations... 3 Valve Bodies... 4 VMS-25 Power Pack Specifications... 4 Electric Actuator Specifications Double Acting Diaphragm Actuator... 5 Max Flow vs. Set Differential Pressure Weights... 9 Dimensions Control Valves in HVAC Water Systems Agency Approvals Agency Approvals CRN Registered All Series 2900 ValveS Operation: One of the primary factors that influence the flow of fluid through a control valve is the amount of pressure, or differential pressure across it. At any point in valve plug travel, flow through a valve will typically increase if differential pressure is raised, and decrease if it is lowered. A change in pumping pressure can therefore produce a change in rate of flow that is not related to the system controller s output signal. With pressure independence, the amount of water flowing through a valve and the controlled load (i.e. heat exchanger coil) is more accurately controlled as a function of the control signal, and is less dependent upon varying pump pressure. Stability in the control system is enhanced when pressure independence is provided, and the control valve s installed flow characteristic more closely resembles its inherent, or constant-pressure characteristic. Flow The Series PICV (Pressure Independent Control Valve) consists of two functional controlling segments. The first segment is a pressurebalanced control valve, actuated by a high-thrust electric motor actuator. The electric actuator provides precise positioning of the valve closure mechanism, and responds quickly and precisely to the electronic control signals supplied to them. The second segment is a differential pressure control valve that operates independently of the control valve segment. This segment is selfpowered (self-operating) and does not burden or interact with the building automation control system. By quickly raising or lowering its own resistance to flow, the differential pressure control segment of the PICV regulates and stabilizes the pressure drop across the control valve segment by absorbing unused head pressure. This compensates for changes in pumping pressure resulting from pump switching or from varying flow demands in it s own, or parallel flow paths and results in pressure independent operation Emrick Blvd Bethlehem, PA USA

3 Control Valve Authority: A mathematical representation for how a control valve will perform in circuit. In general terms, it is a ratio for what the full load pressure drop is on the control valve with respect to the full load pressure drop of the entire circuit including the control valve. Valve authority should be in the general range of If the value gets too low, the control valve looses its rangeability where low demand control performance suffers and nonlinearities throughout the control range are more dramatic. If the value is too high, the valve may be a bit small for the job and generally is not making efficient use of energy. Control Valve Authority Can Be Expressed as: N = Pcv / ( Pcv + Prcc) where N = Control Valve Authority Pcv = Differential pressure of Control Valve Element when under full open - full load condition Prcc = Differential pressure of Remaining Control Circuit under same full load condition. IV IV If you have a system that is completely closed loop and unto itself, then ΔPrcc truly does represent everything else in the circuit. HOWEVER If the circuit is actually a sub circuit and part of a larger loop, whereby a degree of inherent pressure isolation exists from interaction with the main loop, largely due to the inherent size and capacity of the main loop, as is the case in say for a main on a district cooling loop, THEN ΔPrcc may only be calculated for elements upstream of the control valve back to the main loop as there will be no interactive influence by the control valve on the elements downstream, as would be realized on a truly closed loop system. THEREFORE A sub circuit of a district main can be considered open loop, and Valve Authority may be calculated against elements upstream of the control valve up to the supply header. This is demonstrated in the diagram to the right, where ΔPrcc is defined as elements under the influence of the Control Valve up to the main header, upstream of the Control Valve element. It is clear that the maximum allowed pressure drop across individual loops within plots of land is a function of the: pump size distance of the plot from the cooling plants loop design within the plot, i.e. number of loops, pipe size, heat exchanger size control valves Pressure Independent Control Valve PICV PS _B

4 performance Mounted in horizontal pipe only with Actuators oriented Vertically above the Valve TYPICAL SPECIFICATION The Pressure Independent Control Valve (PICV) shall consist of two functional controlling segments. The first segment is an electrically actuated control valve, capable of responding to a control signal from a controller, not part of the PICV. The second segment senses and regulates a preset adjustable flowing differential pressure across the control valve segment from 0.14 to 0.55 BARD, depending on spring choice, factory preset to customer s specifications. Both segments include pressure balancing control elements of industrial quality for optimum control performance in the presence of high system pressures and ensuring long life. Stainless steel trim shall be used when flowing differential pressures of the PICV exceed 6.8 BARD to a maximum of 10.2 BARD while bronze or stainless steel trim may be used for pressures under 6.8 BARD. The electronic control valve segment shall accept all common control signals of 4-20 ma, 0 20 ma, 0 10 Vdc, 2 10 Vdc, shall be operated by a power supply of 24 VAC or 220 VAC, shall not exceed a power consumption of 25 VA, shall provide a minimum of ANSI Class III leakage in the shut position to a maximum shut off pressure of 10.2 BARD. The 24 VAC electric actuator shall be capable of Fail Open or Fail Closed operation, field selectable, with a wall mounted back-up control module. The pressure independent control valve shall be manufactured in accordance with ISO Use Warren Controls #P The VM actuators can be furnished with optional battery backup for fail safe operation. The Differential Pressure (DP) Segment combines Type 72 valve body assemblies with differential diaphragm actuators. CV and DP segments are bolted together, complete with sensing lines. Flange dimensions are in accordance with DIN standard Sizing & Selection: While it may be common in many tempered water loops to simply size valves on pipe size, all factors should be considered. Static pressure, close off pressure, flowing differential pressure, MIN and MAX flows and temperature to name a few. The Warren Controls Pressure Independent Control Valve (PICV) has a Rangeability of 50:1, meaning that good control performance can be achieved when the minimum flow requirement is as low as 1/50 of the maximum flowing L/S or GPM. Simply identify the desired Set Differential Pressure to identify Model and Size by Maximum Flow. Assuming the Minimum Flow is within 1/50 of the Maximum, the proper choice has been made.* *NOTE: The maximum differential pressure across the entire PICV is approximately 2 x (Set Differential Pressure) at max flow Configurations Please make a selection from each table of OPTIONS below to make a complete model number string. Control Valve Size Control Valve Flange Control Valve Profile Control Valve Trim Size Control Valve Trim Material Control Valve Motor DPRV Size DRPV Flange DRPV Trim Material DRPV Actuator P2 DN65 P3 DN80 P4 DN100 P5 DN125 P6 DN150 P8 DN200 P1 DN250 2 Flanges 22 Type of Control Valve Body (Sizes P8 & P1) 23 Type of Control Valve Body (Sizes P2-P6) F Control Valve Trim Size Full X Control Valve Trim Size Extended 1 Control Valve Trim Size 1SR 2 Control Valve Trim Size 2SR S Stainless Steel B Bronze E020 VM1500E - Fail As Is E021 VM1500E - w/vms-25 BCM E022 VM5000E - Fail As Is E023 VM5000E - w/vms-25 BCM TIG1 TR5000-X -Fail As Is P2 DN65 P3 DN80 P4 DN100 P5 DN125 P6 DN150 P8 DN200 P1 DN250 2 Flanges Note: Must match control valve DS DPRV w/ SS Trim DB DPRV w/ Brz Trim 2L DPRV Actuator Cast Iron, w/ Low DP Spring 2M DPRV Actuator Cast Iron, w/ Medium DP Spring Emrick Blvd Bethlehem, PA USA

5 Valve Bodies Body Material: End Connections: Trim Designs: Trim Material: Fluid: Trim Limits: Packing: Body Pressure Temperature Ratings Cast Iron Iron Body FF Flanges Temperature 125 FLG & 23 - Single Seat Cylinder Balanced, ANSI Class III Leakage O F O C PSIG BARG 35 to to and 72 - Double Seat Balanced, ANSI Class III Leakage Bronze or 300 Series Stainless Steel EPDM Seal (23 w/bronze Trim) Fluoraz Seal (23 w/stainless Steel Trim) Chilled Water Typical, Water or Water/Glycol from 2 C - 82 C (35 F- 180 F) Stainless Steel: MAX Flowing Differential Pressure, 10.3 BARG (150 PSIG) Bronze: MAX Flowing Differential Pressure, 6.9 BARG (100 PSIG) Long-Life Multi-Stack EPDM Lip Packing - Water / Water-Glycol Service Electric Actuator Specifications (VM-1500E and VM-5000E) Valve Usage: VM-1500E Valve sizes DN65, DN80 & DN100, VM-5000E Valve sizes DN125, DN150, DN200, DN250 Control Signal: 4-20 madc (Factory Setting), 0-20 madc, 0-10 Vdc or 2-10 Vdc and Floating, Self-Adjusting, Field Selectable (Dip Switch) Power Consumption: VM-1500E 12VA, VM-5000E 25VA Timing: VM-1500E [4.02 sec. / mm, 102 sec. / inch] VM-5000E [2.99 sec./mm, 76 sec / inch] Feedback Signal: 4-20 madc (Factory Setting), 0-10 Vdc or 2-10 Vdc Failure Mode: Fail-As-Is [Without VMS-25 BCM Back-up Control Module] Fail-Safe [Without VMS-25 BCM Back-up Control Module] Manual Override: Yes Construction: Polycarbonate Motor Housing with Steel Linkage & Yoke. Case has one 1.27 cm (1/2 inch) NPSM Conduit Adapter Connections: Coded Screw Terminals Locations: NEMA Type 3 / IP54 Temperature Limits: Ambient 0 C - 50 C (32 F F) Mounting: Factory Aligned, Vertical Above Centerline of Control Valve Consult factory for preconfigured alternate orientations VMS-25 BCM (Back-up Control Module) Specifications Actuator Usage: VM-1500E & VM-5000E Required for Fail Safe Operation Failure Direction: Field Selectable Power Consumption: 24VAC, 40VA Construction: Battery w/circuit Board & Transformer, in Nema 4 Enclosure Mounting: Wall Mount Weight: 2 kg (4.25 lbs) Operation: The Backup Control Module provides for a fail-open or fail-closed condition upon loss of power or signal Pressure Independent Control Valve PICV PS _B

6 VMS-25 BCM Dimensions 4X 0.31 in (0.79 cm) thru mounting foot 5.19 in (13.18 cm) 8.75 in (22.23 cm) 6.69 in (16.99 cm) 6.72 in (17.O7 cm) 4.91 in (12.47 cm) 6.97 in (17.7O cm) 8.5 in (21.59 cm) 1/2 in (1.27 cm) Electric Actuator Specifications (TR5000-X) Valve Usage: DN125, DN150, DN200, DN250 Control Signal: 4-20 madc (Factory Setting), 0-10 Vdc, 2-10 Vdc, or 0-20 madc; Field Selectable (Dip Switch) Control Action: Direct Acting, Actuator Shaft Extends on Increasing Signal (Factory Setting) or Reverse Acting, Actuator Shaft Retracts on Increasing Signal; Field Selectable (Dip Switch) Power Supply: 220 VAC Power Consumption: 12VA Timing: s/mm ( Seconds / Inch) Feedback Signal: 4-20 madc (Factory Setting), 0-10 Vdc, 2-10 Vdc, or 0-20 madc Field Selectable (Dip Switch); Feedback Signal Increase as Actuator Shaft Extends (Factory Setting) or Feedback Signal Increases as Actuator Shaft Retracts; Field Selectable (Dip Switch) Failure Mode: Fail Actuator Shaft Retracted on Loss of Signal (Factory Setting) or Fail Actuator Shaft Extended on Loss of Signal Field Selectable (Dip Switch); Actuator Shaft Fails In Last Position on Loss of Power Manual Override: Yes Construction: Die Cast Aluminum Motor Housing & Yoke. Painted. Case Has Two PG11 Cable Glands Accepts 5mm to 10mm (0.197 to inch) Diameter Cable Connections: Coded Screw Terminals Locations: NEMA Type 3 / IP54 Temperature Limits: Ambient -10 C to 50 C (14 F to 122 F) Mounting: Factory Aligned, Vertical Above Centerline of Control Valve; Consult factory for preconfigured alternate orientations DPRV Double Acting Diaphragm Actuator with Spring Assist (Series 2) Control Signal: Differential Pressure from Control Valve, 0.14 to 0.55 BARD (2 to 8 PISG) 10.3 BARD (150 PSIG) Max Static Fluid: Chilled Water Typical, Water or Water/Glycol from 2 C - 82 C (35 F- 180 F) Spring Pack: Low DP Spring: Adjustable BARD (2 to 6 PSIG) Medium DP Spring: Adjustable BARD (5 to 8 PSIG) Construction: Cast Gray Iron Class G3000, epoxy coated, epoxy coated spring, SS components, Buna-N nylon reinforced diapragm. Temperature Limits: Ambient 0 C - 50 C (32 F F) Mounting: Factory Aligned, Vertical Above Centerline of Control Valve Consult factory for preconfigured alternate orientations Emrick Blvd Bethlehem, PA USA

7 Flange Product Model (where x is a configurable option) Low DP Spring Performance Medium DP Spring Performance P2223Fx-xxxx-P22Dx-2x DN65 Standard Port P32231S-xxxx-P32Dx-2x DN80 1 SizeReduced Port SS Trim Only P3223Fx-xxxx-P32Dx-2x DN80 Standard Port P42232S-xxxx-P42Dx-2x DN100 2 Sizes Reduced Port SS Trim Only P42231S-xxxx-P42Dx-2x DN100 1 Size Reduced Port SS Trim Only P4223Fx-xxxx-P42Dx-2x DN100 Standard Port P52232x-xxxx-P52Dx-2x DN125 2 Sizes Reduced Port P52231x-xxxx-P52Dx-2x DN125 1 Size Reduced Port P5223Fx-xxxx-P52Dx-2x DN125 Standard Port Pressure Independent Control Valve PICV PS _B

8 Flange Product Model (where x is a configurable option) Low DP Spring Performance Medium DP Spring Performance P62232x-xxxx-P62Dx-2x DN150 2 Sizes Reduced Port P62231x-xxxx-P62Dx-2x DN150 1 Size Reduced Port P6223Fx-xxxx-P62Dx-2x DN150 Standard Port P6223Xx-xxxx-P62Dx-2x DN150 Extended Port P82222S-xxxx-P82Dx-2x DN200 2 Sizes Reduced Port SS Trim Only P82221S-xxxx-P82Dx-2x DN200 1 Size Reduced Port SS Trim Only P8222Fx-xxxx-P82Dx-2x DN200 Standard Port P12222S-xxxx-P12Dx-2x DN250 2 Sizes Reduced Port SS Trim Only P12221S-xxxx-P12Dx-2x DN250 1 Size Reduced Port SS Trim Only Emrick Blvd Bethlehem, PA USA

9 Flange Product Model (where x is a configurable option) Low DP Spring Performance Medium DP Spring Performance P1222Fx-xxxx-P12Dx-2x DN250 Standard Port Conversions PSI X = BAR GPM X = LPS Pressure Independent Control Valve PICV PS _B

10 PICV Weights Model PICV Size Control Valve DPRV TOTAL WT (KG) TOTAL WT (LBS) actuator Actuator P2223xx-E02x-P22Dx-2L DN65 VM-1500E 2L P2223xx-E02x-P22Dx-2M DN65 VM-1500E 2M P3223xx-E02x-P32Dx-2L DN80 VM-1500E 2L P3223xx-E02x-P32Dx-2M DN80 VM-1500E 2M P4223xx-E02x-P42Dx-2L DN100 VM-1500E 2L P4223xx-E02x-P42Dx-2M DN100 VM-1500E 2M P5223xx-E02x-P52Dx-2L DN125 VM-5000E 2L P5223xx-E02x-P52Dx-2M DN125 VM-5000E 2M P5223xx-TIG1-P52Dx-2L DN125 TR5000-X 2L P5223xx-TIG1-P52Dx-2M DN125 TR-5000-X 2M P6223xx-E02x-P62Dx-2L DN150 VM-5000E 2L P6223xx-E02x-P62Dx-2M DN150 VM-5000E 2M P6223xx-TIG1-P62Dx-2L DN150 TR5000-X 2L P6223xx-TIG1-P62Dx-2M DN150 TR-5000-X 2M P8222xx-E02x-P82Dx-2L DN200 VM-5000E 2L P8222xx-E02x-P82Dx-2M DN200 VM-5000E 2M P8222xx-TIG1-P82Dx-2L DN200 TR5000-X 2L P8222xx-TIG1-P82Dx-2M DN200 TR-5000-X 2M P1222xx-E02x-P12Dx-2L DN250 VM-5000E 2L P1222xx-E02x-P12Dx-2M DN250 VM-5000E 2M P1222xx-TIG1-P12Dx-2L DN250 TR5000-X 2L P1222xx-TIG1-P12Dx-2M DN250 TR-5000-X 2M Weights for models with VM actuators do not include a VMS-25 BCM. Add 2Kg (4.25 Lbs) Actual shipping weights may vary Emrick Blvd Bethlehem, PA USA

11 Dimensions PICV Sizes: DN65-DN100 Ddpv With VM1500E Actuator Dcv Hdpv Hcv Ccv Cdpv Bcv Bdpv Acv Adpv Xcdp Control Valve (Left) measurements in cm Model Listing SIZE Acv Bcv Ccv Dcv Hcv P2223xx-E02x-P22Dx-xx DN P3223xx-E02x-P32Dx-xx DN P4223xx-E02x-P42Dx-xx DN Acv +/ cm All other dimensions are maximum Allow cm above actuator for removal service Differential Pressure Valve (Right) measurements in cm Total combined* Model Listing SIZE Adpv Bdpv Cdpv Ddpv Hdpv Xcdp P2223xx-E02x-P22Dx-2L DN P2223xx-E02x-P22Dx-2M DN P3223xx-E02x-P32Dx-2L DN P3223xx-E02x-P32Dx-2M DN P4223xx-E02x-P42Dx-2L DN P4223xx-E02x-P42Dx-2M DN * Includes gasket between Control Valve and Differential Pressure Valve Adpv +/ cm Xcdp +/ cm All other dimensions are maximum Allow cm above actuator for removal service Conversion cm X = inches Pressure Independent Control Valve PICV PS _B

12 Dimensions PICV Sizes: dn125-dn150 With TR5000 Actuator With VM5000E Actuator Control Valve (Left) measurements in cm Model Listing SIZE Acv Bcv Ccv Dcv Hcv P5223xx-E02x-P52Dx-xx DN P5223xx-TIG1-P52Dx-xx DN P6223xx-E02x-P62Dx-xx DN P6223xx-TIG1-P62Dx-xx DN Acv +/ cm All other dimensions are maximum Allow cm above actuator for removal service Differential Pressure Valve (Right) measurements in cm Total combined* Model Listing SIZE Adpv Bdpv Cdpv Ddpv Hdpv Xcdp P5223xx-xxxx-P52Dx-2L DN P5223xx-xxxx-P52Dx-2M DN P6223xx-xxxx-P62Dx-2L DN P6223xx-xxxx-P62Dx-2M DN * Includes gasket between Control Valve and Differential Pressure Valve Adpv +/ cm Xcdp +/ cm All other dimensions are maximum Allow cm above actuator for removal service Emrick Blvd Bethlehem, PA USA

13 Dimensions PICV Sizes: DN200-DN250 With VM5000E Actuator With TR5000 Actuator Control Valve (Left) measurements in cm Model Listing SIZE Acv Bcv Ccv Dcv Hcv P8222xx-E02x-P82Dx-xx DN P8222xx-TIG1-P82Dx-xx DN P1222xx-E02x-P12Dx-xx DN P1222xx-TIG1-P12Dx-xx DN Acv +/ cm All other dimensions are maximum Allow cm above actuator for removal service Differential Pressure Valve (Right) Total combined* Model Listing SIZE Adpv Bdpv Cdpv Ddpv Hdpv Xcdp P8222xx-xxxx-P82Dx-2L DN P8222xx-xxxx-P82Dx-2M DN P1222xx-xxxx-P12Dx-2L DN P1222xx-xxxx-P12Dx-2M DN * Includes gasket between Control Valve and Differential Pressure Valve Adpv +/ cm Xcdp +/ cm All other dimensions are maximum Allow cm above actuator for removal service measurements in cm Pressure Independent Control Valve PICV PS _B

14 Control Valves in HVAC Water Systems Fluid Quality and Service Life Guide Lines: The purpose of these guidelines is to avoid valve and water systems problems caused by poor water quality in HVAC systems. While all cooling and heating systems are susceptible to problems, closed chilled water systems, including those containing brine or glycol, are especially prone to system and valve problems. To achieve the satisfactory operation and maximum life of your Warren Controls valve, it is important that the following recommendations are adhered to and that a water treatment, filtration and control specialists be consulted before the system start-up. Water Quality Recommended Parameters Chilled Water, Closed Loops, and Hot Water Systems up to 212 F (100 C). 8.0 < ph < 10.3 Conductivity < 3000 MMHS Iron < 0.5 ppm Copper < 0.5 ppm Chilled Systems Hot Systems 100 ppm < Molybdenum < 150 ppm (Mild Steel Corrosion Inhibitor) 200 ppm < Molybdenum < 250 ppm (Mild Steel Corrosion Inhibitor) 400 ppm < Nitrite < 1000 ppm (Mild Steel Corrosion Inhibitor) Azole > 5 ppm free and available (Yellow Metal Inhibitor) Bacteria < 1000 cells/ml (when system is cool)! Water CAUTION The use of hydrazine can result in the formation of ammonia and must be controlled to prevent stress corrosion and embrittlement, which can lead to fracture of some brass alloys. hardness should be less than 100 ppm of hard water ions (Ca++, Mg++), where 17.1 ppm = 1 Grain Hardness. Additionally, levels of chloride and sulfate should remain less than 25 ppm. When water hardness is at unacceptable levels, a water softener expert should be consulted. Antifreeze Solutions-Glycols The commonly used heat transfer glycol fluids are, either ethylene glycol or propylene glycol. Glycol concentrations of <25% often do not provide sufficient corrosion inhibiting properties and at levels <20% can actually provide a food source for bacteria. As bacteria consume the food and die off, a highly acidic condition can result. The recommended concentration for popular glycol based solutions is 25% to 60% Emrick Blvd Bethlehem, PA USA

15 NOTES: Pressure Independent Control Valve PICV PS _B

16 Product Specification PICV PS _B 1110