⚡ Check Valve Slam & Air Chamber
Calculate reverse velocity slam pressure spikes during pump trip and size pneumatic air cushion surge vessel dampening.
⚡ Fortran 90 Engine
Double Precision (IEEE 754)
✓ ISO / ASME Validated
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📅 Mise en service
Jun 2026
⏱️ Latence
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⚡ Check Valve Dynamic Closure & Air Vessel Surge Dampening
Real-time visual simulation of reverse flow slam and pneumatic buffer compression📝 Configuration & Presets
💧 Water Station (400 mm)
🪨 Slurry Line (250 mm)
🏢 High-Rise Booster (100 mm)
🛢️ Reflux Pump (150 mm)
Key Dynamic Formulations:
• Reverse Velocity: vR = (dv/dt) · tclose
• Joukowsky Slam: ΔPslam = ρ · a · vR
• Peak Pressure: Ppeak = Pstatic + ΔPslam
• Air Vessel: Vair = [2 A L v₀² ρ] / [2 · 10⁵ · ΔPallow (1 + Pstat/ΔPallow)]
• Reverse Velocity: vR = (dv/dt) · tclose
• Joukowsky Slam: ΔPslam = ρ · a · vR
• Peak Pressure: Ppeak = Pstatic + ΔPslam
• Air Vessel: Vair = [2 A L v₀² ρ] / [2 · 10⁵ · ΔPallow (1 + Pstat/ΔPallow)]
📊 Slam & Vessel Sizing Results
Configure inputs and click Compute to view results.
📘 Calculation Methodology & Engineering Theory
Dynamic Reverse Flow & Valve Slam
When a pump trips, fluid decelerates at rate $dv/dt$. Check valves take finite time $\Delta t_c$ to seat, allowing reverse flow to develop:
vR = (dv/dt) · tclose, ΔPslam = ρ · a · vR
Fast-acting nozzle non-slam check valves close before significant reverse velocity builds up.
Air Cushion Vessel Sizing
Pneumatic air chambers absorb kinetic energy of the reversing fluid column through polytropic air compression, limiting peak head to $\Delta P_{allow}$.
Key Engineering Assumptions
- Rigid or elastic pipe acoustic wave speed calculated via Korteweg equation.
- Uniform fluid column deceleration after pump power trip.
- Isothermal / polytropic gas compression ($n = 1.2$) inside the air vessel.