Non-Return Valves - exakm.gr

NEW!ERHARDNON SLAM Nozzle Check Valves

The ERHARD NON SLAM Nozzle Check Valvesets new measures:The ERHARD NON SLAM NozzleCheck Valve is one of the mosteconomic valves among thedifferent types of check valves. Itis used to prevent reflux of theflow medium in a pipeline. Theinnovative NON SLAM NozzleCheck Valve offers ERHARDquality with an optimumprice-output ratio and excellenthydraulic performance. Thanks tosome special design features, theNON SLAM Nozzle Check Valve isthe ideal non-return valve for anyapplication.Fields of application:➬ Water supply➬ Pump stations➬ Water distribution➬ Process engineering and IndustryFlow media:➬ Untreated water and drinking water➬ precleaned sewage waterTypical examples of application:Non-return valve in pumping stations (withsingle or parallel pump operation), Non-returnvalve in cooling-water circuits, Foot valve inpumping stations, Non-return valve for energystorage or network systems (e.g. deliveryreservoirs, pipe networks, elevated tanks,headwater basins).PerformanceMinimum head loss thanksto optimised streamlined design:head loss coefficient ζ = 0.5 - 0.7in fully open positionCompact shape and short face-to-facedimension. Standard face-to-face toEN 558 series 14 (0.4 DN + 150mm).Your AdvantagesVery economical:continuous energy saving,low operating costsLight weight, very little space requirementwith standardised lengthHigh-grade surface protection:outside: EKB-epoxy coating,inside: ERHARD vitreous enamelStreamlined valve disc: corrosion resistantmaterial with rubber coating(zinc-free bronze/NBR)Optimum hydraulic characteristics:quick response, short closing strokeReliable long-life design:internal body secured, made of corrosionresistant material (zinc-free bronze),all interfaces protected against corrosionNo rust, thus reliable and clean:permanent protection,safe operation ensuredResilient-seated /permanent tightness (rate 0)Optimum protection against corrosionKTW approved elastomerReliable and safe operation,minimising water hammerSmooth and quick closingSafe function for lifeInternal components easily exchangeableOptimum protection against corrosionComprehensive field of application:- spring force adapted to the various cases ofapplication- suitable for high flow velocities and pressure ratingsUniversal application:- any position of installation possible(horizontal/vertical inclined)- adaptable to any plant conditions

ERHARD NON SLAM Nozzle Check ValvesMaterials:(standard design – special types upon request!)Valve disc: zinc-free bronze/NBR 1)Internal body:zinc-free bronzeGuiding stem:stainless steelBody:ductile cast ironSpring:stainless steelSurface protection, outside:EKB epoxy coatingSurface protection, inside:ERHARD vitreous enamel1) DVGW and KTW approval for gas and water.Dimensions, weights:SizeDNFace-to-facedimensions (mm)(EN 558-series14)Weightapprox.kgHead-loss coefficientin open positionζFlange outside diammPN10/16DN 80 180 14 0,8 – 200 200 200DN 100 190 19 0,7 – 220 235 235DN 125 200 27 0,7 – 250 270 270DN 150 210 32 0,5 – 285 300 300DN 200 230 50 0,6 340 340 360 375DN 250 250 70 0,7 400 400 425 450DN 300 270 97 0,7 455 455 485 515PN10PN16PN25PN40Scope of supply:Sizes: DN 80-300Pressure ratings: PN 10-40Temperatures up to: 70° C (Water)Face-to-face dimensions: adaptation to all thecommon face-to-facedimensions possibleSpecial designs upon request.Enquiry / quotation:We need the following data for preparing a quotation:➬ Size DN➬ Pressure rating PN➬ Type of flow medium / analysis➬ Working temperature➬ Flow velocities (min./max.)➬ Characteristic curve of the plant➬ Position of installation➬ Case of applicationPlease, contact us. We will be glad to advise you.

Hydraulic characteristics comparedwith other valves:Very economical:The optimized curve of cross sections and the welldesigned streamlined contour of the ERHARDNON SLAM Nozzle Check Valve result in minimumhead-loss coefficient during operation. Comparedto other check valves, its ZETA-value will be 0.5 forsize DN 150 in fully open position (at a flowvelocity of approx. 2m/s).Continious cost saving:The ERHARD NON SLAM Nozzle Check Valveallows enormous energy saving – thanks to its lowhead-loss coefficients. The diagramm shows thatfor large sizes and high flow velocities, the annualsaving might even exceed the purchase price ofthe valve.The above energy cost saving is based on the following equation:∆C =π · · v DN2 3 · (ζ2 - ζ1) ·r · B · K E8000 · ηgSymbols and units:∆C cost saving per time unit [Euro/a]DN Nominal diameter of pipe/valve [m]v flow velocity [m/s]K 1 head-floss coefficient ov valve 1 [-]K 2 head-floss coefficient ov valve 2 [-]ηg overall efficiency of pumping plant [-]B running time of pumping plant [h/a]KE energy costs [Euro/Kwh]rdensity of the flow mediumkgm 3Example DN 300:With DN 300 and an assumed flow velocity of2.5 m/s, the possible annual saving when using anERHARD NON SLAM Nozzle Check Valve insteadof a diagram check valve will be about1400.– EURO per year.In any case, it pays to compare the cost.Postfach 1280 · D-89502 HeidenheimPhone: +49(0)7321 320-0 · Fax: +49(0)7321 320-525http://www.erhard.dee-mail: export@erhard.deData corresponding to the latest level of development, modifications reserved.Printed in Germany. 02/02