# What is Cv valve sizing?

## What is Cv valve sizing?

Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. It is technically defined as “the volume of water at 60°F (in US gallons) that will flow through a valve per minute with a pressure drop of 1 psi across the valve.”

## What is Cv in flow rate?

What is Cv value? The valve flow coefficient according to the JIS standard, represents the flow capacity in US gallons/minute of 60° F pure water when it is flowing through the valve with a pressure difference of 1 psi at the specified travel (operation range).

What is CV calculation?

The formula for the coefficient of variation is: Coefficient of Variation = (Standard Deviation / Mean) * 100. In symbols: CV = (SD/x̄) * 100. Multiplying the coefficient by 100 is an optional step to get a percentage, as opposed to a decimal.

What is CV in flow rate?

### What is CV for ideal gas?

The molar specific heat capacity of a gas at constant volume Cv is the amount of heat required to raise the temperature of 1 mol of the gas by 1◦C at the constant volume. Its value for monatomic ideal gas is 3R/2 and the value for diatomic ideal gas is 5R/2.

### How to calculate the C V of a valve?

This is our valve C v calculator. It allows you to calculate the flow or C v (flow coefficient) to make the relationship visible between the pressure drop (the difference in pressure between two points in a network transporting a liquid or gas) and the flow rate.

How is the capacity of a valve determined?

With the flow coefficients capacities of valves at different sizes, types and manufacturers can be compared. The flow coefficients are in general determined experimentally and express the flow capacity in imperial units – GPM (US gallons per minute) that a valve will pass for a pressure drop of 1 lb/in2 (psi)

What is the CV of an oversized valve?

An oversized valve operates more frequently at lower openings with increased dead band as result. For liquids the flow coefficient – Cv -is expressed with water flow capacity in gallons per minute (GPM) of 60oF with pressure drop 1 psi (lb/in2).

#### What does CV mean in gallons per minute?

Rate of flow depends upon the pressure drop. Cv is the amount of flow in gallons per minute through a valve which results in a 1 psi pressure drop. Throttling characteristics are shown in the same manner with Cv’s at various openings. Use formula shown below to compute actual flow at various pressure drops. Weir Valve Cv Ratings