Utah State University
<<The two objectives of this paper are: (1) to present a test method by which check valves can be dynamically tested for sudden closure due to reverse flow; and (2) to discuss the valve and pipe characteristics which affect the reverse velocities and pressure surges at the check valves . The information developed from the test method can then be used to predict the resulting upstream and downstream transients or pressure surges caused by a check valve closure for a given piping system and flow deceleration. It should be possible to apply the following test method for the field testing of check valves that are already in use. Flow deceleration is calculated from the piping system and flow change due to pump shutdown or closure of a control valve. The test method of this paper produces a relationship between the flow deceleration and the reverse velocity at which the check valve closes. The reverse velocity is then used to calculate the pressure surge from transient equations and methods found in publications such as Hydraulics of Pipelines by J. Paul Tullis and Fluid Transients by Wylie and Streeter. The test method can be used for most types of check valves, as long as they are un-dampened and in a full open position when the flow deceleration begins.>>
Technical Advantages of Specifying and Using Goodwin Dual Plate Check ValvesGood Technical Information
Choosing a Check ValveApco Willamette
<<Check valves are available in numerous types, styles and shapes. Generally a valve manufacturer builds only one type of check valve. APCO builds six (6) types and fourteen (14) styles. We offer the consulting engineer open, objective and unbiased information about a broad range of check valves; their proper selection and application. The purpose of this treatise is to collect and condense the many desirable and undesirable features of the most common type checks into a single source. With this single source of information we will simplify the design engineer's check valve selection and make this selection accurate and compatible with the application intended. Following are six (6) basic types of check valves. Of these basic types, three (3) are available in several forms.>>
