TYPES OF VALVES

Mechanical Science Volume 2 of 2
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TYPES OF VALVES DOE-HDBK-1018/2-93 Valves TYPES OF VALVES Due to the various environments, system fluids, and system conditions in which flow must be controlled, a large number of valve designs have been developed. A basic understanding of the differences between the various types of valves, and how these differences affect valve function, will help ensure the proper application of each valve type during design and the proper use of each valve type during operation. EO 1.4 Given a drawing of a valve, IDENTIFY each of the following types of valves: a. Globe b. Gate c. Plug d. Ball e. Needle f. Butterfly g. Diaphragm h. Pinch i. Check j. Safety/relief k. Reducing EO 1.5 DESCRIBE the application of the following types of valves: a. Globe b. Gate c. Plug d. Ball e. Needle f. Butterfly g. Diaphragm h. Pinch i. Check j. Safety/relief k. Reducing Gate Valves A gate valve is a linear motion valve used to start or stop fluid flow; however, it does not regulate or throttle flow. The name gate is derived from the appearance of the disk in the flow stream. Figure 4 illustrates a gate valve. The disk of a gate valve is completely removed from the flow stream when the valve is fully open. This characteristic offers virtually no resistance to flow when the valve is open. Hence, there is little pressure drop across an open gate valve. When the valve is fully closed, a disk-to-seal ring contact surface exists for 360, and good sealing is provided. With the proper mating of a disk to the seal ring, very little or no leakage occurs across the disk when the gate valve is closed. ME-04 Rev. 0 Page 8

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