n UL Listed and FM Approved for n Solenoid control n Quick pressure relief valve 73Q n Pressure sustaining & reducing valve 723
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1 Pressure Relief/Sustaiig Valve Prioritizig pressure zoes Esurig cotrolled pipelie fill-up Prevetig pipelie emptyig Pump overload & cavitatio protectio Safeguardig pump miimum flow Excessive lie pressure protectio The Pressure Relief/Sustaiig Valve is a hydraulically operated, diaphragm actuated cotrol valve that ca fulfill either of two separate fuctios. Whe istalled i-lie, it sustais miimum pre-set, upstream (back) pressure regardless of fluctuatig flow or varyig dowstream pressure. Whe istalled as a circulatio valve, it relieves excessive lie pressure whe above maximum pre-set. Features ad Beefits Lie pressure drive Idepedet operatio Balaced seal disk High relief flow capacity I-lie serviceable Easy maiteace Double chamber desig o Moderated valve reactio o Protected diaphragm Flexible desig Easy additio of features Variety of accessories Perfect missio matchig Y or agle, wide body Miimized pressure loss Semi-straight flow No-turbulet flow Stailess Steel raised seat Cavitatio damage resistat Obstacle free, full bore Ucompromisig reliability V-Port Throttlig Plug Low flow stability Major Additioal Features UL Listed ad FM Approved for fire protectio FP-730-UL/FM Soleoid cotrol Quick pressure relief valve 73Q Pressure sustaiig & reducig valve 723 Check feature High sesitivity pilot Level cotrol & pressure sustaiig valve 753 Pump cotrol & pressure sustaiig valve 743 Pump circulatio & pressure sustaiig valve 748 Electrically selected multi-level settigs High sesitivity hydraulic positioig Electroic pressure sustaiig valve See relevat BERMAD publicatios.
2 Operatio - Pressure Sustaiig (I-Lie) The is a pilot cotrolled valve equipped with a adjustable, 2-Way pressure sustaiig pilot. The restrictio [1] cotiuously allows flow from the mai valve ilet ito the upper cotrol chamber [2]. The pilot [3] seses upstream pressure ad should be set to miimum system pressure allowed. Should upstream pressure ted to fall below pilot settig, the pilot throttles, eablig pressure to accumulate i the upper cotrol chamber, causig the mai valve to throttle, sustaiig upstream (back) pressure at pilot settig. Should upstream pressure be below pilot settig, the pilot closes, causig the mai valve to close drip tight. Should upstream pressure ted to rise above pilot settig, the pilot releases accumulated pressure causig the mai valve to modulate ope. The dowstream cock valve [4] eables maual closig. [3] [1] [2] [4] Typical Applicatios Valve Regulates Valve Closed (Upstream pressure below pilot settig) Pump Overload ad Cavitatio Protectio The sustais pump discharge pressure, prevetig pump overload ad cavitatio damage caused by excessive demad. By coectig the pilot sesig lie to pump suctio, the becomes R which sustais pump suctio pressure. Where suctio pressure regimes vary, the Model 736 is eeded to limit pump flow by sustaiig pump differetial pressure. Pressure Sustaiig Valve Check Valve Model 70N
3 Prioritizig Oe Zoe over Aother This applicatio is usually foud i gravity fed systems. The eables prioritizig the higher elevatio zoe over dowhill cosumers whe they create excessive total demad. By addig a pressure reducig feature to the primary pressure sustaiig fuctio, the becomes a Model 723 that also protects dowhill cosumers from over pressure durig low demad. Pressure Sustaiig Valve Pressure Sustaiig & Reducig Valve Model 723 Prevetig Lie Emptyig Lie emptyig presets a serious problem i water distributio etworks. Prevetig it i dowhill etworks requires settig the pilot slightly above the elevatio differetial betwee the highest poit of the lie ad the valve. Where a pump provides pressure A, the relatively high pressure causes the to ope wide. Whe the pump stops, pressure drops below pilot settig ad the valve closes drip-tight prevetig lie emptyig. Where a reservoir provides pressure B, there is oly a small potetial for variatio i pressure (the differece i high ad low reservoir levels). The problem is made worse by havig a sigificat part of that potetial pressure lost o lie frictio. The stadard might ot be eough. The solutio is to istall a valve with very low head loss, super sesitivity, accuracy ad repeatability. Istall the -85 pressure sustaiig with high sesitivity hydraulic positioig. A Pressure Sustaiig Valve B Pressure Sustaiig Valve Valve with with Hydraulic Positioig -85
4 Pilot System Specificatios Stadard Materials: Pilot: Body: Stailess Steel 316 or Broze Elastomers: Sythetic Rubber Sprig: Galvaized Steel or Stailess Steel Tubig & Fittigs: Stailess Steel 316 or Copper & Brass Accessories: Stailess Steel 316, Brass ad Sythetic Rubber Elastomers Pilot Adjustmet Rage: 0.5 to 3.0 bar ; 7 to 40 psi 0.8 to 6.5 bar ; 11 to 95 psi 1 to 16 bar ; 15 to 230 psi 5 to 25 bar ; 70 to 360 psi Notes: Ilet pressure, outlet pressure ad flow rate are required for optimal sizig ad cavitatio aalysis Recommeded cotiuous flow velocity: m/sec ; 1-20 ft/sec Miimum operatig pressure: 0.7 bar ; 10 psi. For lower pressure requiremets cosult factory.
5 Operatio - Pressure Relief (Circulatio) The is a pilot cotrolled valve equipped with a adjustable, 2-Way pressure sustaiig pilot. The restrictio [1] cotiuously allows flow from the mai valve ilet ito the upper cotrol chamber [2]. The pilot [3] seses upstream pressure ad should be set slightly above system workig pressure. Should upstream pressure rise above pilot settig, the pilot releases pressure from the upper cotrol chamber, causig the mai valve to modulate ope, relievig excessive upstream pressure. Should upstream pressure fall, the pilot throttles, eablig pressure to accumulate i the upper cotrol chamber, causig the mai valve to throttle closed, sustaiig upstream (back) pressure at the pilot settig. Should upstream pressure be below pilot settig, the pilot closes, causig the mai valve to close drip tight. The dowstream cock valve [4] eables maual closig. [3] [1] [2] [4] Valve Closed (Upstream pressure below pilot settig) Valve Regulates Typical Applicatios Safeguardig Pump Miimum Flow The relieves over pressure caused by excessive pump discharge durig low demad. To keep a costat discharge pressure, the differece betwee pumped flow ad cosumer demad ca be circulated back to pump suctio. Pump Cotrol Valve Model 740 Pressure Relief (Circulatio) Valve Circulatio valves are ofte exposed to severe cavitatio because valve P ad velocity are usually high while dowstream pressure is very low. O the other had, the valves operate uder these coditios for relatively short periods. Icreased valve durability for applicatios requirig log operatig periods will be achieved by usig cavitatio resistat materials, addig a dowstream orifice, istallig a upstream pressure reducig valve, icreasig valve size, or ay combiatio of these choices.
6 Techical Data Size Rage: DN ; 1 1 /2 36 Ed Coectios (Pressure Ratigs): Flaged: ISO PN16, PN25 (ANSI Class 150, 300) Threaded: BSP or NPT Others: Available o request Valve Patters: Y (globe) & agle, globe (DN ; ) Workig Temperature: Water up to 80 C ; 180 F Stadard Materials: Body & Actuator: Ductile Iro Iterals: Stailess Steel, Broze & coated Steel Diaphragm: Sythetic Rubber Nylo fabric-reiforced Seals: Sythetic Rubber Coatig: Fusio Boded Epoxy, RAL 5005 (Blue) approved for drikig water or Electrostatic Polyester Powder Differetial Pressure Calculatio Q ΔP =( ) 2 (Kv;Cv) ΔP = Differetial Pressure for fully ope valve (bar; psi) Q = Flow rate (m 3 /h; gpm) Kv = Metric system - valve flow coefficiet (flow i m 3 /h at 1 bar ΔP with 15 C water) Cv = US system - Valve flow coefficiet (flow i gpm at 1 psi ΔP with 60 F water) Cv = Kv Flow Data & Dimesios Table DN / Size Flow Data 700-ES 700-EN 700ES 700 & 700EN PN16; 25 PN16; Flaged Y PN25 Y PN16 Class 300 Class Threaded Agle PN16; 25 Y PN16; 25 Class 150; 300 Class 150; 300 Globe PN16 Class 150 Globe PN25 Class 300 Kv / Cv - Flat ,045 1,520 1, ,250 2, ,070 4,701 Kv / Cv - V-Port ,292 1, ,913 2, ,460 3,996 Kv / Cv - Y Flat ,250 1,440 1,850 2,140 1,990 2,300 3,310 3,820 3,430 3,960 3,550 4,100 Kv / Cv - Y V-Port ,063 1,230 1,573 1,820 1,692 1,950 2,814 3,250 2,916 3,370 3,018 3,490 L (mm / ich) , , W (mm / ich) h (mm / ich) H (mm / ich) , Weight (Kg/lb) ,061 2,334 L (mm / ich) W (mm / ich) h (mm / ich) H (mm / ich) Weight (Kg/lb) L (mm / ich) , , W (mm / ich) h (mm / ich) H (mm / ich) , , , Weight (Kg/lb) , , ,121 L (mm / ich) , , , W (mm / ich) h (mm / ich) H (mm / ich) , , , Weight (Kg/lb) , ,174 L (mm / ich) W (mm / ich) Specify whe orderig: h (mm / ich) H (mm / ich) Size H Weight (Kg/lb) W Mai model L (mm / ich) h Additioal features W (mm / ich) L R (mm / ich) Patter h (mm / ich) Body material H (mm / ich) Ed coectio Weight (Kg/lb) DN / Size " " " " " L (mm / ich) 1, , , , , W (mm / ich) 1, , , , , h (mm / ich) H (mm / ich) 1, , , , , Weight (Kg/lb) 3,250 7,150 3,700 8,140 3,900 8,580 4,100 9,020 4,250 9,350 L (mm / ich) 1, , , , , W (mm / ich) 1, , , , , h (mm / ich) H (mm / ich) 1, , , , , Weight (Kg/lb) 3,500 7,700 3,700 8,140 3,900 8,580 4,100 9,020 4, H W h L Coatig Voltage & mai valve positio Tubig & Fittigs materials Operatioal data (accordig to model) Pressure data Flow data Reservoir level data Settigs * Use Bermad s Waterworks Orderig Guide ifo@bermad.com The iformatio herei is subject to chage without otice. BERMAD shall ot be held liable for ay errors. All rights reserved. Copyright by BERMAD. PC7WE30 09
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