Data sheet ERHARD non slam nozzle check valve
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1 Data sheet ERHARD non slam nozzle check valve
![Valve disc, spring and closing travel have been engineered in such a way [2] that the ERHARD non slam nozzle check valve reacts](/docs-images/76/74476630/images/2-3.jpg "that quickly even in highest flow delays (e. g.")
2 2 ERHARD non slam nozzle check valve ERHARD non slam nozzle check valve The innovative non-return valve for maximum economy An optimised flow cross-sectional area as well as a valve disc and valve stem gasket designed for minimum flow resistance ensure minimum head losses with the ERHARD non slam nozzle check valve. This enables highly economic operation especially in pumping stations. Valve disc, spring and closing travel have been engineered in such a way [2] that the ERHARD non slam nozzle check valve reacts that quickly even in highest flow delays (e. g. in a vertical line) that only minimal return flow velocities occur, with the flow being gently slowed, thus reducing water hammers to a minimum. Thanks to its compact form (face-to-face dimension to DIN EN 558, basic line 4), the adjustable spring force as well as its use in any installation position, the ERHARD non slam nozzle check valve can be used for a wide range of applications up to pressure ratings of PN 4 in the natural and drinking water sector as well as in purified wastewater. The body is made from spheroidal cast iron EN-JS3 (EN-JS25 for PN 4), the body insert is made from bronze. The resilient-seated piston is rubberised to W27. All internal parts can be easily replaced and the guide bushes are maintenance-free. The ERHARD non slam nozzle check valve is internally enamelled for protection against corrosion and the outside has been coated with EKB in blue. Position indication is optionally available [3]. Operating instructions BA43E with position indication: BA43E 2 3
3 ERHARD non slam nozzle check valve 3 The overview Brief specifications: Valve disc (DN8-3): zinc-free bronze / elastomer KTW / W27 Valve ring (DN35-6):.444 / elastomer KTW / W27 Internal body: zinc-free bronze Guiding stem: stainless steel Guiding bush: high-performance polymer Body: ductile cast iron Spring: stainless steel Protection outside: ERHARD EKB fusion bonded epoxy Protection inside: ERHARD vitreous enamel Dimensions and weights Nominal size DN face-to-face dim. L (EN558- basic line 4) mm Weight approx.. kg Flange outside diameter D mm Locking (Hub) mm PN/6 PN PN 6 PN 25 PN 4 DN DN DN DN DN DN DN DN DN DN DN We need the following data for preparing a quotation: Nominal size DN Temperature range Position of installation Pressure rating PN Flow velocities (min. / max.) Case of application Type of flow medium / analysis Characteristic curve of the plant Please contact us. We will be glad to advise you. Area of operations Minimum back-pressure DN8-3: 4 mws Minimum back-pressure DN35-6: 8 mws Max. working temperature +6 C Full opening at approx. 2 m / s Hydraulic characteristic curves 5 ζ = ( π DN2 ) 2 78,57 k v DN... mm 5 ζ = ( π DN2 ) 2 78,57 k v DN... mm 45 4 DN 3 25 DN DN 25 DN 5 kv-value (m 3 /h) DN 2 DN 5 DN 25 DN DN 8 kv-value (m 3 /h) DN 4 DN
4 4 ERHARD non slam nozzle check valve Zeta-Values Diagrams valid for cavitation free operation. DN 8 PN 4, Zeta-value at 5 m / s:,85 DN PN 4, Zeta-value at 5 m / s:, , , DN 25 PN 4, Zeta-value at 5 m / s:, , , DN 2 PN / 6, Zeta-value at 5 m / s:,5 DN 25 PN / 6, Zeta-value at 5 m / s:,69 DN 5 PN / 6, Zeta-value at 5 m / s:, , ,
5 ERHARD non slam nozzle check valve 5 Zeta-Values Diagrams valid for cavitation free operation. DN 3 PN / 6, Zeta-value at 5 m / s:,74 DN 35 PN / , , , DN 4 PN / 6 DN 5 PN / , , 6 4 2, 2 3 4, DN 6 PN / , , Zeta-value with increasing speed Zeta-value with decreasing speed Pressure loss Dp
6 TALIS is the undisputed Number One for water transport and water flow control. TALIS has the best solutions available in the fields of water and energy management as well as for industrial and communal applications. We have numerous products for comprehensive solutions for the whole water cycle from hydrants, butterfly valves and knife gate valves through to needle valves. Our experience, innovative technology, global expertise and individual consultation processes form the basis for developing long-term solutions for the efficient treatment of the vitally important resource water. ERHARD GmbH & Co. KG Postfach 28 D-8952 Heidenheim Meeboldstrasse 22 D Heidenheim phone Fax Internet Note: Specifications may be changed without notification at any time. Copyright: No copying without express written permission of ERHARD ERHARD is a Registered Trademark EN (/5)
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