Pressure Independent Control Valves

Transcription

1 Pressure Independent Control Valves Hydronic Components, onents, Inc Miller ler Drive, Warren, MI phone: (586) fax: (586)

2 Pressure Independent Control Valve The Terminator PICV Pressure Independent Control Valve is a combined constant ow limiter and full stro e, full authority, e ual percenta e temperature control valve. The Terminator PICV is suitable for use in variable and constant temperature systems and may be used as a constant ow limiter in constant volume systems (without an actuator head) or as a true PICV in variable volume systems. Operating principles The Terminator PICV valve is made up of three main parts: 1. di erential pressure re ulator 2. re ulatin valve for ow ad ustment 3. ow pre-settin nob The di erential pressure re ulator is the heart of the pressure independent control valve. y eepin a constant di erential pressure across the control valve, constant ow and full authority temperature control can be achieved. Incomin pressure P1 is transmitted to the top face of the diaphra m, while out oin pressure P3 is transmitted to the underside of the same diaphra m. constant e ective di erential pressure is maintained between P2 and P3. s P1 increases relative to P3, it acts on the diaphra m closin the shutter ( ) a ainst a seat ( ), thereby lowerin the e ective di erential pressure. s P1 decreases relative to P3, the diaphra m acts to open the shutter ( ) from the seat ( ), thus increasin the e ective di erential pressure. The diaphra m acts a ainst a sprin in order to balance the pressure control and stop the diaphra m oscillatin Functional schematic P1 A B P2 P3 Water ow throu h a valve varies as a function of the area of passa e and the pressure di erential across that valve. Due to the incorporation of the di erential pressure re ulator, the di erential across the valve seats P2 P3 is constant, meanin that ow is now only a function of area of passa e. Settin and maintainin a ow rate value is also possible. The control valve presents an e ual percenta e characteristic. The maximum ow can be preset, cho in the outlet section of the control valve, by usin the raduated ad ustment nob. The percenta e value, indicated on the scale, matches the maximum ow rate percenta e. This value can be chan ed by turnin the ad ustment nob until it reaches the selected position (matchin the percenta e indicated on the scale). loc in mechanism stops the valve set values from bein chan ed inadvertently.

3 PICV replaces a traditional control valve on a terminal unit ( C, C, H ). It limits ow rate irrespective of pressure and o ers the possibility to modulate the ow rate (accordin to room temperature) by usin a proportional thermostat or MS system. Q 100% 70% 50% % actuator stroke 3.63 PSI Start-up P1 - P2 The dynamic curve can be initially limited usin a raduated pre-settin device then the ow can be further ad usted by means of the control valve, which is positioned by the actuator. Control valve Pre-setting Chan es desi n ow accordin to control lo ic of MS Kv% 100% 90% 80% 70% 60% ON-OFF 50% 40% 30% 20% Equal percentage curve n(eq) = % 0% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Actuator / valve stroke %

4 91 Series 1/2 thru 3/4 93 Series 3/4 thru 1-1/4 vailable with IP x IP threads vailable with double union ends (male, female, or sweat) Manual ow settin device FLOW RATE low rate can be ad usted without ta in the actuator o the valve. emovable diaphra m for ushin, maintenance and trouble shootin DIAPRAGHM Diapra hm is one solid piece, resultin in easier handlin and maintainance. Thermal electric Electromotive Thermal electric Electromotive n/ loatin n/ loatin Proportional Proportional Proportional Proportional 120V 120V 120V 120V

5 85 Series Solid and reliable characterized control ball valve Double union end connection for total exibility Characterized pro le / full port pro le Manual ow settin device OPERATION MODE Control valve is fully open, controllin the ow throu h a pro led ball and a 90 rotatin actuator. FLUSHING MODE Control valve is rotated by 180, with a pro led openin outside of the ow path. The valve now has full port passa e, allowin twice the maximum ow, for proper ushin and cleanin. 90 Rotary actuator Proportional 90 Rotary actuator oating 110V 90 Rotary actuator spring return 110V

6 94F Series FEATURES Intelli ent actuator with user-friendly interface for ow settin. Selectable linear or e ual percenta e control characteristic. Ductile Iron body. lan ed connections to SI standards. Maximum ow up to PM. Flow rate can be easily set from the on-board user interface. Compatible with most commonly used control signals: Proportional (current or voltage control) 3 point floating ON/OFF 4 20 ma position feedback signal as default option, for total remote management.

7 PRODUCT 91/93/85 SERIES 94F SERIES Size low ran e ( PM) mm in 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2" 2 1/2" 3" 4" 5" 6" Qmin Qmax luid Cold/hot water Temp. ( uid) Di erential pressure ran e PSI PSI Material ody rass / Ductile iron Ductile Iron Diapra- hm PDM Connection Threaded / union end lan ed Max operatin static pressure 360 PSI 230 PSI HCi reserves the ri ht to chan e the described products and the relative technical data at any time and without prior notice. HCi ma es every attempt to ensure all information within this document is accurate. However, the company does not accept any liability for incorrect information published within this document. Please contact us at csr hciterminator.com for uestions or more information.

8 7243 Miller Drive, Warren, MI phone: (586) fax: (586) IT-HCI-PS