CV Calculator for Liquid

• Full Scale Flow - Flow Rate in GPM units.
• Upstream Pressure - Pressure upstream of the valve in psi units. Note that pressure differential is all that maters, and use psia or psig for both upstream and downstream.
• Downstream Pressure - Pressure downstream of the valve in psi units.
• Specific Gravity - Specific gravity of the liquid. For water, use the value of 1. For a list of other common fluids, see here.

CV Calculator for Steam

• Full Scale Flow - Flow Rate in lbs per hour units.
• Upstream Pressure - Pressure upstream of the valve in psia (absolute pressure or psig + 14.7).
• Downstream Pressure - Pressure downstream of the valve in psia (absolute pressure or psig + 14.7).
• This program will only work with Saturated Steam and not superheated steam service.

CV Calculator for Gas

• Full Scale Flow - Flow Rate in Standard Cubic Feet per Hour (SCFH).
• Upstream Pressure - Pressure upstream of the valve in psia (absolute pressure or psig + 14.7).
• Downstream Pressure - Pressure downstream of the valve in psia (absolute pressure or psig + 14.7).
• Specific Gravity - Specific gravity of the gas. For air, use the value of 1. For a list of other common gasses, see here.
• Flowing Temperature - Flow temperature in Deg. F (Deg F = Deg C * 1.8 + 32).