Y-Body Design

Mechanical Science Volume 2 of 2
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TYPES OF VALVES DOE-HDBK-1018/2-93 Valves Globe Valve Body Designs The three primary body designs for globe valves are Z-body, Y-body, and Angle. Z-Body Design The simplest design and most common for water applications is the Z-body. The Z-body is illustrated in Figure 9. For this body design, the Z-shaped diaphragm or partition across the globular body contains the seat. The horizontal setting of the seat allows the stem and disk to travel at right angles to the pipe axis. The stem passes through the bonnet which is attached to a large opening at the top of the valve body. This provides a symmetrical form that simplifies manufacture, installation, and repair. Y-Body Design Figure 10 Y-Body Globe Valve Figure 10 illustrates a typical Y-body globe valve. This design is a remedy for the high pressure drop inherent in globe valves. The seat and stem are angled at approximately 45. The angle yields a straighter flowpath (at full opening) and provides the stem, bonnet, and packing a relatively pressure- resistant envelope. Y-body globe valves are best suited for high pressure and other severe services. In small sizes for intermittent flows, the pressure loss may not be as important as the other considerations favoring the Y-body design. Hence, the flow passage of small Y-body globe valves is not as carefully streamlined as that for larger valves. ME-04 Rev. 0 Page 16

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