Operation - Pressure Relief (Circulation) Technical Data ...

1 BERMAD WaterworksBERMAD WaterworksBERMAD Waterworks700 Series700 Series700 SeriesFeatures and Benefitsn Line Pressure driven Independent operationn Balanced seal disk High Relief flow capacityn In-line serviceable Easy maintenancen Double chamber designo Moderated valve reactiono Protected diaphragmn Flexible design Easy addition of featuresn Variety of accessories Perfect mission matchingn Y or angle, wide body Minimized Pressure lossn Semi-straight flow Non-turbulent flow n Stainless Steel raised seat Cavitation damage resistantn Obstacle free, full bore Uncompromising reliabilityn V-Port Throttling Plug Low flow stabilityn Prioritizing Pressure zonesn Ensuring controlled pipeline fill-upn Preventing pipeline emptyingn Pump overload & cavitation protectionn Safeguarding pump minimum flown Excessive line Pressure protectionModel 730 Model 730 Operation - Pressure Relief (Circulation)The Model 730 is a pilot controlled valve equipped with an adjustable, 2-Way Pressure sustaining restriction [1] continuously allows flow from the main valve inlet into the upper control chamber [2].

2 The pilot [3] senses upstream Pressure and should be set slightly above system working upstream Pressure rise above pilot setting, the pilot releases Pressure from the upper control chamber, causing the main valve to modulate open, relieving excessive upstream Pressure . Should upstream Pressure fall, the pilot throttles, enabling Pressure to accumulate in the upper control chamber, causing the main valve to throttle closed, sustaining upstream (back) Pressure at the pilot setting. Should upstream Pressure bebelow pilot setting, the pilot closes, causing the main valve to close drip downstream cock valve [4] enables manual ApplicationsSafeguarding Pump Minimum FlowThe Model 730 relieves over Pressure caused by excessive pump discharge during low demand. To keep a constant discharge Pressure , the difference between pumped flow and consumer demand can be circulated back to pump valves are often exposed to severe cavitation because valve P and velocity are usually high while downstream Pressure is very low.

3 On the other hand, the valves operate under these conditions for relatively short periods. Increased valve durability for applications requiring long operating periods will be achieved by using cavitation resistant materials, adding a downstream orifice, installing an upstream Pressure reducing valve, increasing valve size, or any combination of these choices. Pressure Relief /Sustaining ValvePump Control Valve Model 740 Pressure Relief (Circulation) Valve Model 730 Valve Closed(Upstream Pressure below pilot setting)Valve Regulates[1][4][3][2]The Model 730 Pressure Relief /Sustaining Valve is a hydraulically operated, diaphragm actuated control valve that can fulfill either of two separate functions. When installed in-line, it sustains minimum pre-set, upstream (back) Pressure regardless of fluctuating flow or varying downstream Pressure . When installed as a circulation valve, it relieves excessive line Pressure when above maximum Additional Featuresn UL Listed and FM Approved for fire protection FP-730-UL/FMn Solenoid control 730-55n Quick Pressure Relief valve 73Qn Pressure sustaining & reducing valve 723n Check feature 730-20n High sensitivity pilot 730-12 n Level control & Pressure sustaining valve 753n Pump control & Pressure sustaining valve 743n Pump circulation & Pressure sustaining valve 748n Electrically selected multi-level settings 730-45n High sensitivity hydraulic positioning 730-85n Electronic Pressure sustaining valve 738-03 See relevant BERMAD / 502 803 1004 1506 2008 25010 30012 35014 40016 45018 50020 Flow Data700 ESKv / Cv - Flat546257666069657514516739545661070590 51,0451,5201,756--2,2502,599--4,0704,701 Kv / Cv - V-Port4653485651595564123142336388519599 7698881,2921,492--1,9132,209--3,4603.

4 996700 & 700 ENKv / Cv - Y Flat424950585564115133200230460530815940 1,2501,4401,8502,1401,9902,3003,3103,820 3,4303,9603,5504,100Kv / Cv - Y V-Port3641434947549811317020039145069380 01,0631,2301,5731,8201,6921,9502,8143,25 02,9163,3703,0183,490700-ESPN16; 25L (mm / inch) , , (mm / inch) (mm / inch) (mm / inch) , (Kg/lb) ,0612,334700-ENPN16; 25L (mm / inch) (mm / inch) (mm / inch) (mm / inch) (Kg/lb) Flanged Y PN16 Class 150L (mm / inch) , , (mm / inch) (mm / inch) (mm / inch) , , , (Kg/lb) ,8659452,0839622,121 Y PN25 Class 300L (mm / inch) , , , (mm / inch) (mm / inch) (mm / inch) , , , (Kg/lb) ,1329862,174700 Threaded Y PN16; 25 Class 150; 300L (mm / inch) (mm / inch) (mm / inch) (mm / inch) (Kg/lb) PN16; 25 Class 150; 300L (mm / inch) (mm / inch) (mm / inch) (mm / inch) (mm / inch) (Kg/lb) / Size60024"70028"75030"80032"90036"Globe PN16 Class 150L (mm / inch)1, ,650651, , , (mm / inch)1, , , , , (mm / inch) (mm / inch)1, , , , , (Kg/lb)3,2507,1503,7008,1403,9008,5804,1 009,0204,2509,350 Globe PN25 Class 300L (mm / inch)1, ,650651, , , (mm / inch)1, , , , , (mm / inch) (mm / inch)1, , , , , (Kg/lb)3,5007,7003,7008,1403,9008,5804,1 009,0204, when ordering:n Size n Main model n Additional features n Pattern n Body material n End connectionn Coating n Voltage & main valve positionn Tubing & Fittings materialsn Operational data (according to model)n Pressure datan Flow datan Reservoir level datan Settings* Use Bermad s Waterworks Ordering GuideFlow data & Dimensions TableDifferential Pressure Calculation P = Differential Pressure for fully open valve (bar; psi)Q = Flow rate (m3/h.)

5 Gpm) Kv = Metric system - valve flow coefficient (flow in m3/h at 1 bar P with 15 C water) Cv = US system - Valve flow coefficient (flow in gpm at 1 psi P with 60 F water) Cv = KvTechnical DataSize Range: DN40-900 ; 11/2 36 End Connections ( Pressure Ratings):Flanged: ISO PN16, PN25 (ANSI Class 150, 300) Threaded: BSP or NPT Others: Available on requestValve Patterns: Y (globe) & angle, globe (DN600-900 ; 24 -36 )Working Temperature: Water up to 80 C ; 180 F Standard Materials: Body & Actuator: Ductile Iron Internals: Stainless Steel, Bronze & coated SteelDiaphragm: Synthetic Rubber Nylon fabric-reinforcedSeals: Synthetic RubberCoating: Fusion Bonded Epoxy, RAL 5005 (Blue) approved for drinking water or Electrostatic Polyester information herein is subject to change without notice. BERMAD shall not be held liable forany errors. All rights reserved. Copyright by BERMAD.

6 WLHhHhLW P =( Q )2 (Kv;Cv)PC7WE30 09 BERMAD Waterworks700 Series700 SeriesBERMAD Waterworks700 SeriesBERMAD WaterworksModel 730 Model 730 Model 730 Prioritizing One Zone over AnotherThis application is usually found in gravity fed systems. The Model 730 enables prioritizing the higher elevation zone over downhill consumers when they create excessive total adding a Pressure reducing feature to the primary Pressure sustaining function, the Model 730 becomes a Model 723 that also protects downhill consumers from over Pressure during low System SpecificationsStandard Materials:Pilot:Body: Stainless Steel 316 or BronzeElastomers: Synthetic RubberSpring: Galvanized Steel or Stainless SteelTubing & Fittings:Stainless Steel 316 or Copper & BrassAccessories:Stainless Steel 316, Brass and Synthetic Rubber ElastomersPilot Adjustment to bar ; 7 to 40 to bar ; 11 to 95 psi1 to 16 bar ; 15 to 230 psi5 to 25 bar ; 70 to 360 psiNotes:n Inlet Pressure , outlet Pressure and flow rate are required for optimal sizing and cavitation analysisn Recommended continuous flow velocity: m/sec ; 1-20 ft/sec n Minimum operating Pressure : bar ; 10 psi.

7 For lower Pressure requirements consult factory. Valve RegulatesValve Closed(Upstream Pressure below pilot setting) Operation - Pressure Sustaining (In-Line)The Model 730 is a pilot controlled valve equipped with an adjustable, 2-Way Pressure sustaining restriction [1] continuously allows flow from the main valve inlet into the upper control chamber [2]. The pilot [3] senses upstream Pressure and should be set to minimum system Pressure upstream Pressure tend to fall below pilot setting, the pilot throttles, enabling Pressure to accumulate in the upper control chamber, causing the main valve to throttle, sustaining upstream (back) Pressure at pilot setting. Should upstream Pressure be below pilot setting, the pilot closes, causing the main valve to close drip tight. Should upstream Pressure tend to rise above pilot setting, the pilot releases accumulated Pressure causing the main valve to modulate downstream cock valve [4] enables manual ApplicationsPump Overload and Cavitation ProtectionThe Model 730 sustains pump discharge Pressure , preventing pump overload and cavitation damage caused by excessive connecting the pilot sensing line to pump suction, the Model 730 becomes Model 730R which sustains pump suction Pressure .

8 Where suction Pressure regimes vary, the Model 736 is needed to limit pump flow by sustaining pump differential Sustaining Valve Model 730 Check Valve Model 70 NPreventing Line EmptyingLine emptying presents a serious problem in water distribution networks. Preventing it in downhill networks requires setting the pilot slightly above the elevation differential between the highest point of the line and the a pump provides Pressure A , the relatively high Pressure causes the Model 730 to open wide. When the pump stops, Pressure drops below pilot setting and the valve closes drip-tight preventing line a reservoir provides Pressure B , there is only a small potential for variation in Pressure (the difference in high and low reservoir levels). The problem is made worse by having a significant part of that potential Pressure lost on line friction. The standard Model 730 might not be enough. The solution is to install a valve with very low head loss, super sensitivity, accuracy and repeatability.

9 Install the Model 730-85 Pressure sustaining with high sensitivity hydraulic Sustaining Valve Model 730 Pressure Sustaining & Reducing Valve Model 723 Pressure Sustaining Valve Model 730 APressure Sustaining Valve Model 730 Pressure Sustaining Valve with Hydraulic Positioning Model 730-85 BPressure Sustaining Valve with Hydraulic Positioning Model 730-85[1][4][3][2]BERMAD Waterworks700 Series700 SeriesBERMAD Waterworks700 SeriesBERMAD WaterworksModel 730 Model 730 Model 730 Prioritizing One Zone over AnotherThis application is usually found in gravity fed systems. The Model 730 enables prioritizing the higher elevation zone over downhill consumers when they create excessive total adding a Pressure reducing feature to the primary Pressure sustaining function, the Model 730 becomes a Model 723 that also protects downhill consumers from over Pressure during low System SpecificationsStandard Materials:Pilot:Body: Stainless Steel 316 or BronzeElastomers: Synthetic RubberSpring: Galvanized Steel or Stainless SteelTubing & Fittings:Stainless Steel 316 or Copper & BrassAccessories:Stainless Steel 316, Brass and Synthetic Rubber ElastomersPilot Adjustment to bar ; 7 to 40 to bar ; 11 to 95 psi1 to 16 bar ; 15 to 230 psi5 to 25 bar ; 70 to 360 psiNotes:n Inlet Pressure , outlet Pressure and flow rate are required for optimal sizing and cavitation analysisn Recommended continuous flow velocity: m/sec ; 1-20 ft/sec n Minimum operating Pressure : bar ; 10 psi.

10 For lower Pressure requirements consult factory. Valve RegulatesValve Closed(Upstream Pressure below pilot setting) Operation - Pressure Sustaining (In-Line)The Model 730 is a pilot controlled valve equipped with an adjustable, 2-Way Pressure sustaining restriction [1] continuously allows flow from the main valve inlet into the upper control chamber [2]. The pilot [3] senses upstream Pressure and should be set to minimum system Pressure upstream Pressure tend to fall below pilot setting, the pilot throttles, enabling Pressure to accumulate in the upper control chamber, causing the main valve to throttle, sustaining upstream (back) Pressure at pilot setting. Should upstream Pressure be below pilot setting, the pilot closes, causing the main valve to close drip tight. Should upstream Pressure tend to rise above pilot setting, the pilot releases accumulated Pressure causing the main valve to modulate downstream cock valve [4] enables manual ApplicationsPump Overload and Cavitation ProtectionThe Model 730 sustains pump discharge Pressure , preventing pump overload and cavitation damage caused by excessive connecting the pilot sensing line to pump suction, the Model 730 becomes Model 730R which sustains pump suction Pressure .