Document oMype4N9epXGL3nkjRb8aDJ2r

680 , CHAPTER 26 1957 Guide pressure work. Steel is the only valve material that can stand appreciable expansion stresses. The characteristics of valves restrict their use. The five main uses for valves are listed below: 1. Stopping flow: The most general use for valves. Gate valves are generally used for this purpose. The gate valVe operates by a disc moving at right angles to the Table 12. Dimensions of Steel Flanges fob Primaby Service Pressure Rating of 150 Psi (Gage) Screwed SlipOn Socket W e ld in g Welding Neck , Socket Weld ing 1 234 5 6 7 8 9 10 11 12 B sdo B ft . sCU J ok aas agh oa m h2 00 . g"ZM 6o2%3 3 2 gQfe ao O Z OC &o a a aB a X aas o.#5 fco *O Length Through Hub mY fc sigs 3%| BSS a A Z ee a0g. 1 4S a 2 5M aBJ O<atsse*88on H T 11 oi i 53 Bore B 0 3 .i aa 3 13 a 3 5 Kes So aoo-t gatufc^oz ooJ< O r K 3K ' He 1M# 0.84 94 3H % m 1.05 1 4K M# 1*M 1.32 m 4H % 294# 1.66 154 5 He 2M# 1.90 96 96 54 94# 54 54 154 % 2V4# 54. 294# *94# 254 54 2 >M 54 0.88 % 1.09 `Me 1.36 *94# 1.70 54 1.95 0.90 1.11 1.38 1.72 1.97 0.62 0.82 1.05 1.38 1.61 54 % % 94# % 2 6 94 344# 2.38 ' 1 2K 7 % 394# 2.88 196 3 7H *M# 4K 3.50 194# 3H m *M# 4*M 4.00 1% 4 9 `Me 594# 4.50 194# 1 2% 1 2.44 2.46 1% 254 196 2.94 2.97 194# 254 1M# 3.57 3.60 194 2*M# m 4.07 4.10 194# 3 IMe 4.57 4.60 2.07 2.47 3.07 3.55 4.03 94# 94# 96 96 M# 5 10 M 654 5.56 1M# 154 354 154e 5.66 5.69 5.05 54a 6 11 1 794# 6.63 1M# 1M# 354 1M# 6.72 6.75 6.07 % 8 10 12 13H m 9*94# 8.63 16 194# 12 10.75 19 154 14% 12.75 194 l`M. 294# 154 4 1*94# 4 294# 454 154 8.72 8.75 1*M 10.88 10.92 254e 12.88 12.92 7.98 10.02 12.00 H % % 14 21 m 1594 14.00 254 16 23K 1H# 18 16.00 2% 354 5 394 s 5 2H 14.14 254 16.16 14.18 16.19 g g 54 54 18 25 1M 19% 18.00 2* Me * 3l94# 554 2`54e 18.18 18.20 % 20 27% 1>K# 22 20.00 254 4H 51%# 254 120.20 20.25 S& 1 % 24 32 154 26% 24.00 354 454 6 3% 24.25 24.25 a% From American Standard for Steel Pipe Flanges and Flanged Fittings, ASA B16.5-1953. All dimensions given in inches. path of the fluid. The fluid flows straight through the valve, hence, a gate valve offers the minimum resistance when it is fully open. The gate is moved by a stein screw attached to the handle. Gate valves are poor regulators because at nearly closed position (where best regulation is obtained) the fluid velocity either causes vibration and noise, or else tends to erode the disc. 2. Throttling flow: This is best accomplished by globe or angle valves. These valves cause the fluid to change direction, and consequently, offer considerable nuio resistance even when in the open position. Both the globe and angle valves opera by closing a plug into a fitted seat. The angle valve is similar to the globe valve Pipe, Fittings, Welding Table 13. Dimensions of Socket Welding Fittings A. Dimensions or Socket Welding Elbows, Tees, and Cbosses 681 Nom inal Pipe Sub Depth op Socket Min Center to Bottom op Socket Sched 40 and 80 Sched 160 Bore Diam eter op Socket, Min Socket Wall Thickness Min Bore Diameter op Fitting Sched 40 Sched Sched Sched Sched Sched 80 160 40 80 160 AB C D H % 96 K H 96 96 96 96 H Me 0.420 0.125 0.125 0.269 0.215 Me . 0.555 0.125 0.149 0.364 0.302 *%2 96 a 0.690 .94 0.855 0.125 0.136 0.158 0.184 0.234 0.493 0.622 0.423 0.546 0.466 94 % 1.065 0.141 0.193 0.273 0.824 0.742 0.614 1 m 54 % %. 54 IK# IK . IMe IK IK 1.330 1.675 1.915 0.166 0.175 0.181 0.224 0.239 0.250 0.313 0.313 0.351 1.049 1.380 1.610 '0.957 1.278 1.500 1.338 2 54 96 96 154 196 2H 196 2H 2K 2.406 2.906 3.535 0.193 .0.254 0.270 0.273 0.345 0.375 0.429 0.469 0.546 2.067 2.469 3.068 ' 1.939 2.323 .2.900 2.125 2.626 B. Dimensions of Socket Welding 45-Deg Elbows, Couplings, and Half Couplings Nom inal Pipe Sub Depth Min Center to Bottom op Socket por 45-Deg Sched 40 and 80 Sched 160 A Halt Cou plings Distance Cou plings, Bottom Between - OP Bottomb Socket op TO Sockets Opposite Face EF Bore Diam eter of Socket, Min B Socket Wall Thickness Min Sched Sched Sched 40 80 160 C Bore Diameter op Fitting Sched Sched Sched 40 . 80 160 D H H H H H H Me Me m H H 54 Me % % M# H K M 96 . 96 H 0.420 0.125 0.125 0.269 0.215 96 0.555 0.125 0.149 0.364 0.302 `He 0.690 0.125 0.158 0.493 0.423 0.855 0.136 0.184 0.234 0.622 0.546 0:466 'Me 1.065 0.141 0.193 0.273 0.824 0;742 0.614 1 U4 1H 54 54 54 Me 'Me *M# *M *M# 1 H H H IK 1.330 0.166 0.224 0.313 1.049 0:957 0.815 191# 1.675 0.175 0:239 0.313 1.380 1.278 .1.160 1M 1.915 0.181 0.250 0.351 1.610 L500 1.338 1 354 3 54 54 1 1% 1H IK 54 IK 196 M M M 1M 1*H# 1M 2.406 2.906 3.535 0.193 0.273 0.429 2.067 1.939 1.689 0.254 0.345 0.469 2.469 2.323 3.125 0.270 0.375 0.546 3.068 2.900 2.626 An . standard lor l all dimensions are in inches.