1. What is a Fill-Rite Flow Control Valve Calculator?

Definition: This calculator estimates the flow rate (in gallons per minute) through a Fill-Rite control valve based on the valve coefficient, pressure drop, and fluid specific gravity.

Purpose: It helps engineers and technicians determine the expected flow rate through control valves in fluid systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( C_v \) — Valve coefficient (dimensionless)
• \( \Delta P \) — Pressure drop across valve (psi)
• \( SG \) — Specific gravity of fluid (dimensionless)

Explanation: The flow rate 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 estimation ensures proper valve sizing, system performance, and prevents issues like cavitation or excessive pressure drop.

4. Using the Calculator

Tips: Enter the valve coefficient (C_v), pressure drop (ΔP in psi), and fluid specific gravity (default 1.0 for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the valve coefficient (C_v)?
A: The C_v represents the flow capacity of a valve - the number of GPM that will flow through the valve with a 1 psi pressure drop.

Q2: Where can I find the C_v for my valve?
A: The C_v is typically provided in the valve manufacturer's specifications or technical datasheet.

Q3: What's a typical specific gravity for common fluids?
A: Water = 1.0, Diesel = 0.85, Gasoline = 0.72-0.78. For other fluids, consult material safety data sheets.

Q4: Does this formula work for all fluid types?
A: The formula works best for Newtonian fluids (water, oils). For non-Newtonian fluids or viscous fluids, additional factors may be needed.

Q5: How does temperature affect the calculation?
A: Temperature primarily affects the specific gravity. Use the SG value at the operating temperature for most accurate results.