Document 2qV8jR7Vw1bO8OLr0nDE0v9ja

688 CHAPTER 26 1958 Guide pressure work. Steel is the only valve material that can stand1 appreciable expansion stresses. The characteristics of valves restrict their use. The five main uses for valves are listed below: l. 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 op Steel Flanges fob Primary Service Pressure Rating of 150 Psi (Gage) Screwed Slip* i Ob Socket 1 W e ld in g Welding Neck Socket Weld ing 1 B a CD B tSo3 i . ao 2 23 4 5 6 7 8 9 10 11 12 h o gB ago Hi fc5 a 3b 0 Id OH 0C eo B i & Q X a 5s Length Through Hub a Y fig * *a g B o 3isl o s II gmSl w A a 8* s 2 K 8 t, 4 oH a* gaMoBb K T Bore B 0.2 sa it 02 GO 0 a 00o. 1 13 H sr b.B gSn bo aOt*-$} M O r ft M 1 1M 1H 2 Zft z z\t 4 5 6 8 10 12 14 16 18 20 24 3# Ms 1Ha 0.84 zn M w 1.05 4J4 Me lMe 1.32 4H # 2Me 1.66 5 `Ms 2M 1.90 6 % 3Me 2.38 7 ZHa 2.88 ` 7# `Ms 4W 3.50 8# Ms 4`Ms 4.00 9 `Ms 5Mo 4.50 10 11 13U 16 19 `Ms 6Me 1 7Ms 1# 9*#e lMs 12 U4 14# 5.56 6.63 8.63 10.75 12.75 21 23# 25 : 27# 32 m 15# IMe [8 IMe 19# l`Me 22 lti 26# 14.00 16.00 18.00 20.00 24.00 ft ft Me `Ms H 1 1H lMs 1M lMs l_Me 1Ha 1H l'Ha 2Me 2M 2# 2`Hfl 2H 3M H Ms lHa H 1 m 1Ha m IMe IMe IMe 1M l`Ms 2Me ZH 3Me 3!Me 4Me 4# m 2Me 2Me 2# 2Me ft 0.88 0.90 ft 1.09 1.11 Ms 1.36 1.38 `Ms 1.70 1.72 H 1.95 " 1.97 0.62 0.82 1.05 1.38 1.61 3W 2M M 2lMe 3 1 1H 1 Me 1# IMe 2.44 2.94 3.57 4.07 4.57 2.46 2.97 3.60 . 4.10 4.60 2.07 2.47 3.07 3.55 4.03 ZH lMs 5.66 5.69 5.05 3M IMe 6.72 6.75 6.07 4 1# 8.72 8.75 7.08 4 1*Ma 10.88 10.92 10.02 w 2Me 12.88 12.92 12.00 5 ZH 14.14 14.18 5 ZH 16.16 16.19 n 5# 2AMe 18.18 18.20 5*Me 2# 20.20 20.25 $ g 6 3M 24.25 24.25 o. # H H Me K Me Me # # Ms Me # # # M # # # # # From American Standard for Steel Pipe Flanges and Flanged Fittings. ASA'B16A-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 stem 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 fluid resistance even when in the open position. Both the globe and angle valves operate by closing a plug into a fitted seat. The angle valve is similar to the globe valve Ripe, Fittings, Welding Table 13. Dimensions of Socket Welding Fittings A. Dimensions or Socket Welding Elbows, Tees, and Cbosbes ? -- I 1 __j- ri 4 *{-- t r* "L_ A7 Hi -A--J*-A-h- T I ii t 68!h Nom inal Pipe Size Depth or Socket Min Center to Bottom or Socket Sched 40 and 80 Sched 160 A Bore Diam eter of Socket, Min \ B Socket Wall Thickness Min Sched Sched Sched 40 80 160 C Bore Diameter or Fitting Sched Sched Sehed 40 80 160 D # H Me 0.420 0.125 0.125 0.269 0.215 M H Me 0.555 0.125 0.149 0.364 0.302, H # # H H # #2 M M it 0.690 0.855 1.065 0.125 0.136 0.141 0;158 0.184 0.193 0.234 0.273 0.493 0.622 0.824 0.423 0.546 0.742 0.466 0.614 l # # IMe 1.330 0.166 0.224 0.313 1.049 0.957 0.815 1H # IMe 1H 1.675 0.175 0.239 0.313 1.380 1.278 1.160 1M .# 1M 1M 1.915 0.181 0.250 0.351 1.610 1.500 1.33S 2 1# 1H 2.406 0.193 0.273 0.429 2.067 1.939 1.689 2M # 1H 2M 2.906 0.254 0.345 0.469 2.469 2.323 2.125 3 h 2M 2M 3.535 0.270 0.375 0.546 3.068 2.900 2.626 B. Dimensions or Socket Welding 45-Deq Elbows, Couplings, and Halr Couplings Center to Half Nom inal Pipe SlSE Depth or Socket, Min Bottom or Socket for 45-Deg Ells Sched 40 and 80 Sched 160 Cou plings Distance Cou plings, Bottom Between Bottoms or Socket or Sockets to Opposite Face A EF Bore Diam eter or Socket, Min B Socket Wall Thickness Mm Sched Sched Sched 40 80 160 C Bore Diameter . . or Fitting Sched Sched Sched 40 80 160 D Hu HH HH h /H HM 1M M M 2 ft H Me Me Me Me M Me lHa `Ms 1 1H 1H # Me }Me Mo 1 1H 1M in M M H # H H &u % H H H H * Me # Me 1H IMe 1W 1M llMe i 0.420 0.555 0.690 0.855 1.065 1.330 1.675 1.915 2.406 2.906 3.535 0.125 0.125 0.125 0.136 0.141 0.125 0.149 0.158 0.184 0.193 0.234 0.273 0.166 0.224 0.313 0.175 0.239 0.313 0.181 0.250 0.351 0.193 0.273 0.429 0.254 0.346 0.469 0.270 0.375 0.546 From American Standard for Steel Socket-Welding Fittings, ASA B16.11-1948. All dimensions are in inches. 0.269 0.364 0.493 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 0.215 0.302 0.423 0.546 0.742 0.957 1.278 1.500 1.939 2.323 2.900 0.466 0.614 0.815 1.160 1.338 1.6S9 2.125 2.626