Document 53kN98xp7NVMKMyBxObDk8XV

632 CHAPTER 27 1955 Guide pressure work. Steel is the only-valve material that can stand appreciable expansion stresses. 1 . > 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 for Primary Service Pressure Rating of 150 Psi (Gage) -o---------------------J * LAPPEO N o m in al P ipe Size Slip-O n Socket ; W elding', M in W elding Neck l Socket Weld! ing 1 2 3 4 5 6 7 8 9 10 11 12 13 u oz " OS' oS a - ao &JaJ zH isl -.o55a O 0C i g Length Through Hub o a ao go S5 ftt, Y a SggI a" . a QE a 1^1 % Z -o cee a 3 TOX A go* s * & S o z *J a o I* <a Sg SCO E-* T Bore B c ii T3 a v aa Q 2 2 % 1 'TT TOX pj a* ^a o ao f2t: TIsd80*.arQs B a oP rD *4 3*4 lMe . 0.84 .. H H 3% *4 m 1.05 H 1 *H HI. l`M 1.32 `He m 4*4 2M* 1.66 `He 1*4 5 Ms 2Me 1.90 H *4 m *4 0.88 0.90 0.62 *4 *4 2He *4 1.09 1.11 0.82 *4 He `He 2He `He 1.36 1.38 1.05 *4 *4 `He 2*4 `He 1.70 1.72 1.38 He He H 2H A 1.95 1.97 1.61 m *4 2 6 H 3\U 2.38 1 1 2*4 1 2.44 2.46 2.07 He Ms 2*4 7 *4 3Me 2.88 1*4 1*4 2*4 1*4 2.94 2.97 2.47 He *4 3 7*4 `Me 4*4 3.50 lMe lHe 2*4 lMe 3.57 3.60 3.07 *4 `He 3M 8*4 ' `Ha 4`Me 4.00 : 1*4 1*4 2`He 1H 4.07 4.10 3.55 *4 4 9 `Ms 6Me 4.50 lMe lHe 3 lMe 4.57 4.60 4.03 H 5 10 `Me 6Ms 5.56 lMe lMe 3*4 lHe 5.66 5.69 5.05 Ms 6 n1 7Ms 6.63 . . IHe lMs 3*4 lHe 0.72 6.75 6.07 *4 8 13*4 1M 9`Me 8.63 1*4 1H 4 1H 8.72 8.75 7.98' *4 10 16 12 10.75 l`Me l`Me 4 llMe 10.88 10.92 10.02 *4 - 12 19 m 14*4 12.75 2He 2He 4*4 2He 12.88 12.92 12.00 *4 14 21 1*4 15M 14.00 2*4 16 23*4 lH` 18 16.00 2*4 3*4 5 3Me 5 2M 14.14 14.18 2M ' 16.10 16.19 3 H *4 18 25 lHe 19*4 18.00 2`J4e 3`He 5*4 2`H 18.18 18.20 M 20 27*4 1H 22 20.00 2*4 4He 5*He 2*4 20-20 20.25 Sag M 24 32 m 26*4 24.00 3M 494 6 3*4 ` 24.25 24.25 5. ii 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 stem screw attached, to the handle. Gate valves are .poor regulators because at nearlyt 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. Boththe globe and angle valves opcrjrt^ 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 op Socket Welding`Elbows, 'Tees, and Crosses 63St Nom inal Pipe Size Depth op Socket Min Center to . Bottom op . Socket Sched HI and 80 Sched ' 160 Bore Diam eter OP Socket, `Min Socket Wall Thickness -Min Sched Sched Sched 40 80 160 Bore Diameter . op Fitting Sched Sched Sched 40 SO - 160 - *4` *494 *4' H l 1*4 2- A` B *4 ' He *4 , ` He *4 `Hs *4 ' *4 *4 *4 *4 *4 *4 U lMe 1*4 *4 ` *4 *4 1*4* 1*4 2*4 *4 *4 lHe 1*4 1*4 1*4 2*4 2*4 07420 0.555 .0.690 0.855 1,065 1.330 ,1.675 1.915 ` 2.408 ` 2.906 3.535 0.125 0.125 0.125 0.136 0.141 0.166 0.175 0.181 0.193 0.254 0.270 C 0.125 0.149 0.158 0.184 0.193 0.224 0.239 0.250 0.273 0.345 0.375 0.234 0.273 : 0.313 0.313 0.351 0.429 0.469 0.546 -D 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 l 0.466 0.614 0.815 1.338 2.125 2.626 B. Dimensions or Socket Welding 45 Deg Elbows, Couplings. an Half Coot-linos Nom inal Pipe Size ----- _ Depth Socket, Min Center to Bottom op Socket pob 45-Deg Ft.tji Sched Sched 80 .A Cou plings Distance Halp Cou plings, Bottom Bottoms Socket Sockets E Opposite Face F Bobb Diam- Socket Wall Thickness Min Bobs Diameter op Fitting op Min Sched Sched Sched Sched Sched Sched 40 80 160 40 80 160 BC D ' *4 H H *4 H *4 *4 *4 *4 . *4 Me Me Me He *4 - M' He *4 *4 0.420 0.125 0.125 0.269 0.215 *4 ` *4 0.555 0.125 0.149 0.364 0.302 *4 `Ms 0.690 0.125 0.168 0.493 0:423 *4 % 0.855 0.136 0.184 0.234 0.622 0.546 0.466 *4* `Ms 1.066 0.141 0.193 0.273 0.824 0.742 0.614 1*4 1*4 *4 *4 *4 He **ie `Me `Ms `Me 1 *4 *4 *4 1*4 lMe 1M 1.330 1.675 1.915 0.166 0.224 0.175 0.239 0.181 0.250 0.313 0.313 0.351 1.049 1.380 1.610 0.957 1.278 1:500 0.815 1.160 1.338 2*4 3 *4 *4 *4 1 1*4 1*4 1W 1*4 1*4 H H ?< l`He i 2.406 2.006 3.535 0.193 0.273 0.429 2.067 1.939 1.689 0.254 0.345 0.469 2.469 2;323 2.125 0.270 0.375 0.546 3.068 2:900 2.626 From American Standard for Steel Socket-Welding Fittings, ASA B1B.11-1946. u aunensiona am in inches.