Terminology D. Pressure Relief Valve Dimensional Characteristics

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=90 BGCOLOR="#000066" TEXT="#F7F7FF" bgproperties="fixed" background="66b00c10dkbliw.jpg"> <div> <FONT SIZE="2" COLOR="#FF6600" FACE="Arial" ><A HREF="index.htm" TARGET="_top" TITLE="PRD Technologies Inc."><U><B>HOME </B></U></A><B> </B></FONT><B>   </B><A HREF="id151.htm" TARGET="_top" TITLE="Pressure Relief Device Terminology"><U><B> </B></U></A><FONT SIZE="2" COLOR="#FF6600" FACE="Arial" ><A HREF="id151.htm" TARGET="_top" TITLE="Pressure Relief Device Terminology"><U><B> BACK </B></U></A></FONT><A HREF="id151.htm" TARGET="_top" TITLE="Pressure Relief Device Terminology"><U><B> </B></U></A><B>|  </B><FONT SIZE="7" COLOR="#FF6600" FACE="Arial" ><B> </B></FONT><FONT SIZE="7" COLOR="#FFFFCC" FACE="Arial" ><B>  </B></FONT><FONT SIZE="6" COLOR="#FFFFFF" FACE="Arial" ><B>PRD Technologies Inc.</B></FONT></div> <bR> <div> </div> </td> </tr><tr> <td valign="top" width=210 BGCOLOR="#FFFFFF" TEXT="#080000"> <div>  Terminology D. Pressure Relief Valve Dimensional Characteristics</div> <bR> <div> <B><IMG SRC="41a9b3e0.png" border=0 width="155" height="62" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B><IMG SRC="26480500.jpg" border=0 width="128" height="80" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <div> <B><IMG SRC="57482420.jpg" border=0 width="130" height="66" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> </td> <td valign="top" height=390 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <I><B>Pressure Relief Solutions & Services</B></I></div> <bR> <div> <B>D. Pressure Relief Valve Dimensional Characteristics</B></div> <bR> <div> <I><B>actual discharge area </B></I>- the measured minimum net area which determines the flow through a valve.</div> <div> <I><B>bore area </B></I>- the minimum cross-sectional flow area of a nozzle</div> <div> <I><B>bore diameter </B></I><I>- </I>the minimum diameter of a nozzle</div> <div> <I><B>curtain area - </B></I>the area of the cylindrical or conical discharge opening between the seating surfaces created</div> <div> by the lift of the disc above the seat</div> <div> <I><B>developed lift - </B></I>the actual travel of the disc from closed position to the position reached when the valve is at</div> <div> flow-rating pressure</div> <div> <I><B>discharge area </B></I>- see <I>actual discharge area</I></div> <div> <I><B>effective discharge area </B></I>- a nominal or computed area of flow through a pressure relief valve, differing from the</div> <div> actual discharge area, for use in recognized flow formulas to determine the capacity of a pressure relief valve</div> <div> <I><B>inlet size </B></I><I>- </I>the nominal pipe size of the inlet of a pressure relief valve, unless otherwise designated</div> <div> <I><B>lift - </B></I>the actual travel of the disc away from closed position when a valve is relieving</div> <div> <I><B>nozzle area, nozzle throat area </B></I>- see <I>bore area</I></div> <div> <I><B>nozzle diameter </B></I>- see <I>bore diameter</I></div> <div> <I><B>orifice area </B></I>- see <I>effective discharge area</I></div> <div> <I><B>outlet size </B></I><I>- </I>the nominal pipe size of the outlet of a pressure relief valve, unless otherwise designated</div> <div> <I><B>rated lift - </B></I>the design lift at which a valve attains its rated relieving capacity</div> <div> <I><B>seat angle </B></I>- the angle between the axis of a valve and the seating surface. A flat-seated valve has a seat angle</div> <div> of 90 degrees.</div> <div> <I><B>seat area </B></I>- the area determined by the seat diameter</div> <div> <I><B>seat diameter </B></I>- the smallest diameter of contact between the fixed and moving portions of the pressure</div> <div> containing elements of a valve</div> <div> <I><B>seat flow area </B></I>- see <I>curtain area</I></div> <div> <I><B>throat area </B></I>- see <I>bore area</I></div> <div> <I><B>throat diamete</B></I><B>r </B>- see <I>bore diameter</I></div> <bR> <bR> <div> <B>For further assistance or information call (330) 253-4800or email: </B><A HREF="mailto:sales@prdtechnologies.com" TARGET="_top" TITLE="mailto:sales@prdtechnologies.com"><U><B>sales@prdtechnologies.com</B></U></A><A HREF="mailto:sales@prdtechnologies.com" TARGET="_top" TITLE="mailto:sales@prdtechnologies.com"><U> </U></A> </div> </td> </tr></table></body>