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Erhard product range

Sizes:. DN 40 - DN 1400. Pressure:. PN 10 – PN 40. Erhard product range. Non return valves. Types:. tilting disc check valve. DN 150 - 1400. PN 10 - 40. swing check valve. DN 40 - 800. PN 10 - 16. NON SLAM nozzle“ type check valve. DN 80 - 600. PN 10 - 40. reflux valve.

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Erhard product range

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  1. Sizes: DN 40 - DN 1400 Pressure: PN 10 – PN 40 Erhard product range Non return valves Types: tilting disc check valve DN 150 - 1400 PN 10 - 40 swing check valve DN 40 - 800 PN 10 - 16 NON SLAM nozzle“ type check valve DN 80 - 600 PN 10 - 40 reflux valve DN 40 - 300 PN 10 - 16 „ECR“ check valve DN 40 - 600 PN 10 - 25 ball check valve DN 50 - 350 PN 10 diaphragm check valve DN 40 - 400 PN 10

  2. Erhard product range Non return valves Criteria for selection: • flow media (water, sewage) • size • pressure rating • headloss • space requirement • closing time (damping) • indication of position (visual, electric) • price

  3. Non return valves SWING type check valve SWING type check valve SWING type check valve DN 40 – 800 PN 10 -16 Design with external shaft – lever and weight Design with internal shaft

  4. Non return valves SWING type check valve SWING type check valve SWING type check valve Features: • preferably for sewage (nearly full passage) • lever and weight (adjustability) • valve disc in stainless steel up to DN 300 • with O-Ring seal

  5. Non return valves Tilting disc check valve DN 150 – 1400 PN 10 - 40 design with hydraulic damping with lever and weight

  6. Non return valves Tilting disc check valve Features:

  7. Non return valves Tilting disc check valve Seat ring of stainless steel O-Ring for resilient seating

  8. Non return valves Tilting disc check valve Design:

  9. Non return valves Principle of hydraulic damping cylinder Valve in fully open position

  10. Non return valves Principle of hydraulic damping cylinder Valve 45° closed Valve closes without damping Oil has free movement

  11. Non return valves Principle of hydraulic damping cylinder Valve closed Oil must pass the flow control valve damped closing

  12. Non return valves Tilting disc check valve Examples for use of hydraulic damping:

  13. Non return valves Tilting disc check valve Headloss characteristic

  14. Non return valves Tilting disc check valve Full opening device (opening cylinder) Pneumatic cylinder Valves is in fully open position also at low flow velocities Low headloss Energy saving

  15. Non return valves Tilting disc check valve Recommendation for installation:

  16. Non return valves Tilting disc check valve Arrangement of lever and weight:

  17. Non return valves NON SLAM Nozzle check valve DN 80- 600 PN 10 - 40 Features: • silent closing • low headloss • short face- to face dimension • resilient seated • inside enamelled

  18. Rubber-coated valve disc Rubber-coated valve ring ERHARD NON SLAM Nozzle Check Valve Types DN 80 - 300 PN 10 - 40 Common features: Internal body: zinc-free bronze Outside: EKB epoxy Inside: vitreous enamel Guide bushes: special plastic material Guide rod, spring: stainless steel DN 350 - 600 PN 10 - 16

  19. Non Return Valves: Hydraulic Characteristics Flow velocity Flow retardation v0 In short, steep pipelines, the water column stops quickly, i.e. flow retardation a is high ! a = dv/dt In long, flat pipelines, the water column does not stop quickly, i.e. flow retardation a is low ! Forward flow TR 0 m/s time t TS T0 Reflux vRmax

  20. Reflux Preventers: Dynamic Characteristics 1,4 1,2 1 Tilting disc check valve with weight-loaded lever DIN swing check valve 0,8 Check valve with slanted seat Diaphragm check valve 0,6 Reflux velocity v in m / s 0,4 Nozzle check valve Tilting disc check valve with slanted seat and spring 0,2 ERHARD NON SLAM Nozzle Check Valve 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Long, flat pipelines Short, steep pipelines Flow retardation dv / dt in m / s²

  21. Non return valves Waterhammer: Max waterhammer according to formula of „Joukowsky“ = max. waterhammer (m WC) = surgewave velocity in water ( = 1200m/s) = change in flow velocity (m/s) = acceleration of earth (m/s²)

  22. Non return valves Calculation of the max. waterhammer at different reflux velocities Reflux velocity – 1 m/s Reflux velocity – 0,2 m/s

  23. Non return valves Reflux check valve DN 40 – 300 PN 10 - 16 body with epoxy – enamel or rubber lining body with epoxy – enamel or rubber lining water and sewage with rubberlined disc

  24. Non return valves ball check valve DN 50 – 350 PN 10 DN 50 – 350 PN 10 for sewage ball of steel rubber coated epoxy coating

  25. Non return valves diaphragm check valve DN 40 – 400 PN 10 for water soft closing

  26. Non return valves „ECR“ check valve DN 40 – 400 PN 10 - 25 wafer type with NBR sealing for use in water quick acting

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