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Matching Valve Type to Function: a Tutorial in Valve Selection

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Matching Valve Type to Function: a Tutorial in Valve Selection Keywords: ฀฀฀฀฀฀฀฀฀฀฀ V A LV E T ECHNOLOGIES Matching valve type to function: A tutorial in valve selection When selecting a valve for an instrumentation system, your choices may seem On-Off Valves overwhelming. Just to name On-off control is the most basic valve a few, there are ball valves, function. Valves in this category stop and diaphragm and bellows valves, -'!"%-"#!0!"'/#Z#).7#Z# 6;#>-./%-0# +3 as well as check valves, excess off valves are ball, gate, diaphragm, and fl ow valves, fi ne metering, bellows valves. Perhaps the most common of all valve gate, multi-port, needle, types, ball valves (see Figure 1) are plug, relief, rising plug, and designed for on-off control. Quarter turn safety valves. Furthermore, %1")%". +#!"%-"!# -#!" ,!#Z# 6#?0#, !.". +.+:# each of these valves comes %#/'"%&&.1#?%&&#.+#%#!"-%.:9"3"9- ):9#Z# 6# in many sizes, confi gurations, path. The ball has a large hole through the materials of construction, and centre of it. When the hole is lined up with Fig. 1 Ball valves are ideal for on-off control. Quarter actuation modes. To make the "9'#Z# 6#,%"94#."#'+%?&'!#Z# 6;#@9'+#."#.!# !"#$%& !% '(#$) %" )$("$) (*)$Z$(,$-.$*()' '(#'#/$%$ 01 %22'&$-%22$'#$%$) "%'/3 4 3"(!/3$Z$(,$*% 35 best choice, it is always good ")-+'7#AB#7':-''!#(- /#"9'#Z# 6#,%"94# ."#!" ,!#Z# 6;#<(#0 )#%-'#!''=.+:#%+# +3 ((# practice to ask the fi rst question $%&$'#6."9#C).1=#!9)" ((#%+7#9.:9#Z# 6# in valve selection: What do I capacity, then a ball valve is a good choice. material, e.g., gaskets and O-rings, normally want the valve to do? The position of the handle provides a quick found around the stem in other valves. indication of whether the valve is open or The valve stem is the cylindrical part that closed, and, for safety purposes, ball valves connects the handle (or actuation) with the are easy to lock out and tag. They are most .++'-#/'19%+.!/#( -#!9)"3 ((4#Z# 6#1 +"- &4# By Michael Adkins, Swagelok Company practical and economical at sizes between and directional control. Usually, the stem DEF#.+19#%+7#G#.+19'!#HI#%+7#JB#//K;# turns and/or moves up and down. Typically used for process control rather All stem seals or packing are subject to !"#$%&$'!#()&Y#&&# +'# (#Y#$'# than instrumentation applications, gate wear, and wear can lead to leakage. Valves ,-./%-0#()+1". +!2# +3 ((4#Z# 6# valves are commonly chosen for on-off with packing must be serviced or replaced M1 +"- &4#7.-'1". +%&#Z# 64# $'-3 control, particularly for lines above 2 inches. at regular intervals, although some types of ,-'!!)-'#,- "'1". +4#%+7#'81'!!3Z# 6# L9'0#%-'#%&! #(-'C)'+"&0#)!'7#%!#"9'#Y#-!"# packing create more effective seals and last protection. Matching valve type to function valve off the process line for process longer than others, such as the two-piece .!#"9'#Y#-!"#%+7#/ !"#./, -"%+"#!"',#.+#"9'# instrumentation, often in a double block and chevron design. valve selection process. It is not unusual ?&''7#1 +Y#:)-%". +;#M/ +:#"9'# &7'!"#"0,'!# Contrary to packed valves, diaphragm .+#"9'#Y#'&7#" #!''#"9'#/.!%,,&.1%". +# (# +3 ((#$%&$'!4#"9'0#%-'#"0,.1%&&0#!,'1.Y#'7#.+# valves (see Figure 2) are packless, and of valves, such as a ball valve used general industrial applications, such as large provide rapid shutoff and precise actuation ( -#"9- ""&.+:#Z# 6;#<+#! /'#1%!'!4#"9'# process or transmission lines. Some can speeds. In some cases, they may also deliver mismatch can be catastrophic, say, if a ball '$'+#?'#&%-:'-#"9%+#DBB#.+19'!#HGJFB#//K;# 1 +!.!"'+"#C)%+".".'!# (#,- 1'!!#Z#).7;#L0,.1%&&04# valve were used in a high-pressure oxygen Multiple rotations of the handle raise and diaphragm valves are employed in high- system. With a source of ignition, the lower a sealing mechanism in and out of a purity applications in the biopharmaceutical sudden burst of oxygen – enabled by the !"-%.:9"#Z# 6#,%"9;#N9)" ((#.!#:-%7)%&; and semiconductor industries. Among all fast opening of the valve – could lead to Packing surrounds the stem, preventing valve types, they provide the highest cycle %+# 80:'+#Y#-'; system media from escaping to atmosphere life, a product of the valve’s highly engineered Below is a tutorial reviewing the basic where the stem meets the valve body. Valves anatomy. Each valve contains a thin metal or types of valves, how they work, what that seal to atmosphere with metal-to-metal ,&%!".1#7.%,9-%:/4#69.19#Z#'8'!#),#%+7#7 6+4# ()+1". +!#"9'0#()&Y#&&4#%+7#69%"#" #"9.+=# seals are referred to as “packless” because creating a leak-tight seal over the inlet. This about when choosing one over the other. they do not contain the soft packing robust valve is usually small, with the largest www.valve-world.net June 2011 49 V A LV E T ECHNOLOGIES 7.!1)!!'7#'%-&.'-4#Z# 6#.!#&./."'7#?'1%)!'# (# "9'#:& ?'3!"0&'#Z# 6#,%"9;#R''7&'#$%&$'!#%-'# %#: 7#19 .1'#6."9#&.:9"'-4#&'!!#$.!1 )!#Z#).7!;## S -#"9'#/ !"#,-'1.!'#Z# 6#1 +"- &4#1 +!.7'-# Y#+'#/'"'-.+:#$%&$'!4#"0,.1%&&0#( )+7#.+# laboratory settings. Fine metering valves are %#"0,'# (#+''7&'#$%&$'4#6."9#%#& +:4#Y#+'#!"'/# that lowers through a long, narrow channel. This anatomy makes for a pronounced globe ,%""'-+4#.7'%&#( -#/%-=.+:#Y#+'#:-%7%". +!# (#Z# 6;#N /'#Y#+'#/'"'-.+:#$%&$'!#%-'#+ "# designed to shut off. Quarter-turn plug valves are utility valves, economically priced. Quarter turn actuation rotates a cylindrical plug in a straight-through Z# 6#,%"9;#L9'#,&):#1 +"%.+!#%+# -.Y#1'#" # ,'-/."#Z# 6;#>&):#$%&$'!#%-'#1 // +&0#)!'7# for low-pressure throttling applications, in addition to shut off. Another type of plug valve is the rising plug Fig. 2 Diaphragm valves provide rapid shutoff and valve. Like a needle valve, a tapered plug precise actuation speeds. Among all valve types, 6'/5$7$811921$:%2:1)$*"(:'91$1;&1221# $Z$(,$ & 6'-!#.+" #%+# -.Y#1'#" #-'7)1'#Z# 6;#<"# they provide the highest cycle life, a product of the &(# "(25$<31$) 10$')$Y$#12.$ 3"1%919>$1#%-2'#/$ 7.(('-!#(- /#%#+''7&'#$%&$'#.+#."!#Z# 6#,%"94# valve’s highly engineered anatomy. *"1&')1$Z$(,$&(# "(25 which is straight-through rather than globe patterned. Because of the straight path, the valve is not as effective at providing -.Y#1'#K# -#.+"'-+%&#,%"96%0#K#"0,.1%&&0#&'!!# necessary to move from the fully open to Y#+'#:-%7%". +!# (#Z# 6;#L9'#-.!.+:#,&):#.!# than 2 inches (50 mm). the fully closed position. roddable, which is a good choice if the valve Like the diaphragm valve, bellows valves are L9'#/ !"#1 // +#Z# 631 +"- &#$%&$'!#%-'# becomes clogged with system media. packless, making them a good choice when +''7&'4#Y#+'#/'"'-.+:4#C)%-"'-3")-+#,&):4# the seal to atmosphere is critical and access and rising plug. Needle valves (see Figure Directional Flow Valves for maintenance is limited. Frequently, they QK#,- $.7'#'81'&&'+"#Z# 6#1 +"- &#%+74# M#"9.-7#"0,'# (#$%&$'#7.-'1"!#Z#).7#Z# 6;## %-'#!,'1.Y#'7#( -#"9'#1 +"%.+/'+"#%-'%#.+# depending on design, leak-tight shut-off. T9'1=#$%&$'!#H!''#S.:)-'#FK#'+!)-'#Z# 6# nuclear power plants. A welded seal divides They consist of a long stem with a highly in one direction only. In most designs, the lower half of the valve, where the system engineered stem-tip geometry (e.g., vee- or "9'#),!"-'%/#Z#).7#( -1'#,)!9'!#%#!,-.+:3 media resides, from the upper parts of the +''7&'3!9%,'7K#"9%"#Y#"!#,-'1.!'&0#.+" #%#!'%"# & %7'7#, ,,'"# ,'+4#%&& 6.+:#Z# 6;#<+#"9'# valve, where actuation is initiated. The stem, $'-#"9'#.+&'";#L9'#!"'/#.!#Y#+'&0#"9-'%7'74# case of an increase in downstream or which is entirely encased in a metal bellows, '+%?&.+:#,-'1.!'#Z# 6#1 +"- &;#N"'/#,%1=.+:# back-pressure force, the poppet is forced moves up and down without rotating, sealing provides the seal to atmosphere. ?%1=#.+" #"9'#!'%"4#!" ,,.+:#-'$'-!'#Z# 6;# over the inlet. Some designs contain a metal-to-metal seat T9'1=#$%&$'!#%-'#%$%.&%?&'#6."9#Y#8'7# -# Bellows valves and diaphragm valves are seal; consequently, needle valves are a good adjustable cracking pressures. !%.7#" #9%$'#%#:& ?'3&.='#Z# 6#,%"9;#<+#:& ?'# choice for high-temperature applications. As Some ball valves and diaphragm valves $%&$'!4#Z#).7#7 '!#+ "#Z# 6#!"-%.:9"#"9- ):9# on a level plane as it does in a ball valve. L9'#Z# 6#,%"9#'+"'-!#"9'#$%&$'#)+7'-#"9'# seat and exits above the seat. Globe valves 6.&&#9%$'#& 6'-#Z# 6#-%"'!#"9%+#$%&$'!#6."9# %#!"-%.:9"3"9- ):9#Z# 6#,%"9# (#"9'#!%/'# -.Y#1'#!.P'; Flow-Control Valves Flow-control valves enable the operator to .+1-'%!'# -#7'1-'%!'#Z# 6#?0#- "%".+:#"9'# handle. The operator can adjust the valve " #%#7'!.-'7#Z# 6#-%"'4#%+7#"9'#$%&$'#6.&&# 9 &7#"9%"#Z# 6#-%"'#-'&.%?&0;#N /'#Z# 63 control valves also provide very reliable 6'/5$?$@31&A$:%2:1)$1#)!"1$Z$(,$'#$(#1$9'"1& '(#$(#2.5$@31&A$:%2:1)$%"1$%:%'2%-21$,' 3$Y$;19$("$%9B!) %-21$ shut-off, but many turns of the handle are cracking pressures. www.valve-world.net June 2011 51 V A LV E T ECHNOLOGIES are designed with multiple ports. In most multi-port valves, Z#).7#'+"'-!#"9- ):9#%#!.+:&'#.+&'"#?)"# may exit through one of many outlets, cylinders to protect against over- depending on the position of the actuator. pressurization, which may occur, for Multi-port valves may or may not have a example, when temperatures rise during shut-off position (see Figure 5). transport. Similar to relief valves, rupture discs vent to atmosphere. A metal Overpressure Protection Valves diaphragm bursts when pressure Valves in this category prevent the build- reaches a set point. This value is up of system pressure beyond a certain preset by the manufacturer. pressure setting. They are available in two Once activated, the rupture types: relief valves and rupture discs. disc must be replaced. One type of relief valve is a proportional Transportation codes require relief valve (see Figure 6).
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