Owner manual

Resilient Seated Butterfly Valves – Valve Sizing Coefficients
All information herein is proprietary and condential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Coefficients : 14
Valve Sizing Coefficients:
1. Valve Sizing Coefficients (Cv) .............................................. Pages 14-15
1. Cv stands for Valve Sizing Coefcient, sometimes called the Flow Rate Coefcient.
2. Cv varies with the valve size, angle of opening and the manufacturer’s valve style.
3. Cv is dened as the volume of water in USGPM that will ow through a given restriction or valve
opening with a pressure drop of one (1) psi at room temperature.
2. Valve Sizing Coefficients (Kv) .............................................. Pages 16-17
1. Kv stands for Valve Sizing Coefcient, sometimes called the Flow Rate Coefcient.
2. Kv varies with the valve size, angle of opening and the manufacturer’s valve style.
3. Kv is dened as the volume of water in Cubic Meters/Hour (m
3
/hr) that will ow through a given
restriction or valve opening with a pressure drop of one (1) bar at room temperature.