Quantcast Y-Body  Design

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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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