1. What is the TLV Water Flow Equation?

The TLV water flow equation calculates the flow rate through a valve based on the valve coefficient (Cv), pressure drop (ΔP), and the specific gravity (SG) of the fluid. It's commonly used in piping system design and analysis.

2. How Does the Calculator Work?

The calculator uses the TLV water flow equation:

Where:

• \( Cv \) — Valve flow coefficient (unitless)
• \( \Delta P \) — Pressure drop across the valve (psi)
• \( SG \) — Specific gravity of the fluid (water = 1.0)
• \( Flow \) — Resulting flow rate (gpm)

Explanation: The equation shows that flow is proportional to the valve coefficient and the square root of the pressure drop to specific gravity ratio.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper valve sizing, system design, and ensuring adequate water supply in piping systems.

4. Using the Calculator

Tips: Enter the valve coefficient (Cv), pressure drop in psi, and specific gravity (use 1.0 for water). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the valve coefficient (Cv)?
A: Cv is the number of gallons per minute of water that will flow through the valve with a 1 psi pressure drop.

Q2: What are typical Cv values?
A: Cv values vary by valve size and type. Small valves might have Cv of 1-10, while large valves can have Cv > 1000.

Q3: How does specific gravity affect the flow?
A: Higher specific gravity (denser fluids) will result in lower flow rates for the same pressure drop.

Q4: What's the maximum pressure drop I should use?
A: This depends on the system, but typically pressure drops above 20-30 psi may cause excessive noise or cavitation.

Q5: Can I use this for other liquids besides water?
A: Yes, as long as you know the specific gravity of the liquid relative to water.