High Pressure, Pressure Reducing Valve - bermad.com

1 BERMAD Waterworks800 SeriesThe Model 820 high Pressure , Pressure Reducing Valve is a hydraulically operated, piston actuated control Valve that reduces higher upstream Pressure to lower constant downstream Pressure regardless of fluctuating demand or varying upstream Flow and leakage reductionn Cavitation damage protectionn Throttling noise reduction n Burst protectionn System maintenance savingsHigh Pressure , Pressure Reducing ValveModel 820 Features and Benefitsn Robust structure, piston actuated high Pressure servicen Line Pressure driven Independent operationn In-line serviceable Easy maintenancen Double chamber design Moderated Valve reactionn 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.

2 Full bore Uncompromising reliabilityn V-Port Throttling Plug Low flow stabilityMajor Additional Featuresn Solenoid control 820-55n Check Valve 820-20n Solenoid control & check Valve 820-25n Proportional 820-PPn Emergency Pressure Reducing Valve 820-PP-59n Downstream over Pressure guard 820-48n Electrically selected multi-level setting 820-45 n Electronic multi-level setting, Type 4T 820-4Tn Electronic Pressure Reducing Valve 828-03 700 SeriesBERMAD Waterworks800 SeriesOperationThe Model 820 is a pilot controlled Valve equipped with an adjustable, 2-Way, Pressure Reducing pilot. The needle Valve [1] continuously allows flow from the Valve inlet into the upper control chamber [2]. The pilot [3] senses downstream this Pressure rise above pilot setting, the pilot throttles, enabling Pressure in the upper control chamber to accumulate, causing the main Valve to throttle closed, decreasing downstream Pressure to pilot setting.

3 Should downstream Pressure fall below pilot setting, the pilot releases the accumulated Pressure , and the main Valve modulates open. The needle Valve controls the closing speed. The downstream cock Valve [4] enables manual closing. Two Models are available, the Standard, Double Chamber 820-PB and the Single Chamber 820-PA*. The Model 820-PA requires auxiliary closing force. In the size range 6-20 ; DN150-500, it is equipped with an auxiliary closing piston [5] connected to valves inlet via a control tube [6]. In the size range 11/2-4 ; DN40-100, an auxiliary closing spring replaces the piston and the tube.* Apply Model 820-PA when required Pressure -reduction ratio (P1/P2) is less than Model 820 Pilot System SpecificationsStandard Materials:Pilot:Body: Brass or Stainless Steel 316 Elastomers: Synthetic RubberSpring: Galvanized Steel or Stainless SteelInternal parts: Stainless SteelTubing & Fittings:Stainless Steel 316 or Copper & BrassAccessories:Stainless Steel 316, Brass and Synthetic Rubber ElastomersPilot Adjustment Range:1 to 16 bar ; 15 to 230 psi - to 10 bar ; 11 to 150 psi2 to 30 bar ; 30 to 430 psi *2 to 45 bar ; 30 to 650 psi * * with high Pressure kitNotes:n Inlet Pressure , outlet Pressure and flow rate are required for optimal sizing and cavitation analysisn Recommended continuous flow velocity: m/sec.

4 1-20 ft/secn Minimum operating Pressure : bar; 30 psin The model 820-PA is equipped with either an auxiliary closing spring (11/2-4 / 40-100mm) or an auxiliary closing piston (6-20 / 150-500mm) thus causing an additional head loss of: Valve SizeAdditional Head Loss11/2-4 (40-100mm) bar6 (150mm)12% of upstream pressure8 (200mm) of upstream pressure10 (250mm)10% of upstream pressure12-14 (300-350mm)7% of upstream pressure16-20 (400-500mm)4% of upstream pressureModel 820-PB Apply when P1/P2> 820-PA Apply when P1/P2< [5][6][1][3][4]P2P1[2][2][1][3][4]P2P1 BERMAD Waterworks800 SeriesTypical ApplicationsPressure Reducing System for Municipal Networks Network design requires establishing various Pressure zones due to topography, distances, demands, energy costs, reservoir availability, 820 The pump supplies water to the network and to the reservoir.

5 System Pressure is too high for the residential neighborhood, requiring a Pressure Reducing Pressure Pressure Reducing ValveModel 820 Relief Valve Model 83 QStrainer Model 80 FPressure Reducing System Typical InstallationIn addition to the Model 820 high Pressure , Pressure Reducing Valve , BERMAD recommends that the system also include:n high Pressure Strainer Model 80F preventing debris from damaging Valve operationn high Pressure , Pressure Relief Valve Model 83Q providing:o Protection against momentary Pressure peakso Visual indication of need for maintenanceFor more information on BERMAD Pressure Reducing Systems, see BERMAD publication 720, Pressure Reducing SeriesBERMAD Waterworks800 SeriesSpecify 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; 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: DN40-500.

6 11/2 20 End Connections ( Pressure Ratings): Flanged: ISO PN16, PN25, PN40 ; ANSI Class 150, 300, 400 Threaded: BSP or NPT Others: Available on requestValve Patterns: Y (globe) & angleWorking Temperature: Water up to 80 C ; 180 F Standard Materials: Body: Cast Carbon Steel; Ductile Iron; Stainless Steel 316 Cover: Stainless Steel 316; Bronze Internals: Stainless Steel & Bronze Seals: Synthetic Rubber Coating: Fusion Bonded Epoxy, RAL 5005 (Blue) approved for drinking water or Electrostatic Polyester Powder information herein is subject to change without notice.

7 BERMAD shall not be held liable forany errors. All rights reserved. Copyright by BERMAD. DN / "502" "803"1004"1506"2008"25010"30012"35014"40 016"45018"50020"Flow Data800 "Y"Kv / 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 02,9163,3703,0183,490800 AngleKv / Cv - "A" Flat4653556461701271462202505065808971,0 401,3751,5902,0352,3502,1892,5303,6414,2 103,7734,360--Kv / Cv - "A" V-Port3945475451591081241872204305007628 801,1691,3501,7302,0001,8612,1503,0953,5 803,2073,710--800 "Y" FlangedPN10; 16 Class 150L (mm / inch) , , (mm / inch) (mm / inch) (mm / inch) , , , (mm / inch) (Kg/lb) ,0014821,0601,0002,2001,0742,3631,0962,4 11PN25: 40 Class 300L (mm / inch) , , , (mm / inch) (mm / inch) (mm / inch) , , , (mm / inch) (Kg/lb) ,1115491,2081,0702,3541,0952,4091,1292,4 84800 Angle, FlangedPN10; 16 Class 150L (mm / inch) (mm / inch) (mm / inch) (mm / inch) (mm / inch) , , (mm / inch) (Kg/lb) ,0109502,0901,0202,244--PN25: 40 Class 300L (mm / inch) (mm / inch) (mm / inch) (mm / inch) (mm / inch) , , (mm / inch) (Kg/lb) ,0585231,1511,0172,2371,0512,312--BBBWHh LRPACEDFWBBLHCEDhPAFB Y PatternAngle Pattern P =( Q )2 (Kv;Cv)PC8WE20 09