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QUARTER TURN/ ROTARYVALVES

MA. NOR AUSTEIN E. CAINOY 

BSCHE-4

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A valve  is a device that regulates, directs orcontrols the o! o" a uid #gases, li$uids,uidi%ed solids, or slurries& '( o)ening,closing, or )artiall( o'structing various

)assage!a(s*

VALVE

+lassication-

.*ethods o" +ontrol0*Valve 1unction

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2* ethods o" +ontrol

+LASS212+AT2ON

3 closure device could 'e a

disc, slat or e4i'le 5aterial,li6e a dia)hrag5

3 use a closure 5e5'er that5oves in a straight line to start,sto), or throttle the o!*

3 tend to 'e slo!er in o)eration,'ut the( have a higher level o"accurac( and sta'ilit( in the

)osition o" the closure 5e5'er*3 e4* gate valves, glo'e valves,4ed cone valves, needlevalves, and )inch valves*

.* Linear otion Valves

0* Rotar( otion Valves

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3 rotate a disc or elli)se a'out anangular or circular sha"t e4tendingacross the dia5eter o" an orice*

3also 6no!n as quarter turn valves

3 Quarter turn valves !ill 'e in their"ull( o)en or "ull( closed state #78&a"ter a 978 turn o" the ste5

3'all valves, 'utter( valves, )lugvalves, and s)herical valves*

2* ethods o" +ontrol

+LASS212+AT2ON

.* Linear otion Valves

0* Rotar( otion Valves

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22* Valve 1unction

+LASS212+AT2ON

3 valves are used "or s(ste5sthat do not need the o!throttled3 valve o)ens to allo! o! andcloses to sto) o!

3are used !hen o! needs to 'ediverted or "or 5i4inga))lications !hen e4act5easure5ents are not re$uired

.* Start/Sto)

0* Throttle

:* Non3return

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22* Valve 1unction

+LASS212+AT2ON

- or control valves control the s)eedand ca)acit( o" o!, te5)erature, or)ressure, through a s(ste5*

3 'e 5oved into an( )osition,including "ull( o)ened and "ull(closed, 'e o)erated !ith a5anual hand !heel or can 'ee$ui))ed !ith an auto5atedactuator*

3 )ressure regulators areres)onsi'le "or var(ing the valve;s)osition to 5aintain constant)ressure do!nstrea5

.* Start/Sto)

0* Throttle

:* Non3return

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22* Valve 1unction

+LASS212+AT2ON

3 or chec6 valves control thedirection o" o!*

3 1lo! in the desired direction o)ensthe valve, !hile o! in the o))ositedirection "orces the valve closed*

3 i5)ortant "or )reventing 'ac6o!to s(ste5s

.* Start/Sto)

0* Throttle

:* Non3return

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So5e E4a5)les o" Rotar( Valves

o

<all Valveo <utter( Valve

o =lug Valve

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So5e E4a5)les o" Rotar( Valves

o

<all Valve

-  uses a hollo!, )er"orated and )ivoting 'all #called a>oating 'all>& to control o! through it*

- 2t is o)en !hen the 'all?s hole is in line !ith the o! and

closed !hen it is )ivoted 973degrees '( the valve handle*

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So5e E4a5)les o" Rotar( Valves

o

<utter( Valve

3 can 'e used "or isolating or regulating o!3 valve is "ull( o)en or closed !hen the disc is rotated a$uarter turn*3 !hen valve is closed, the disc is turned so that it

co5)letel( 'loc6s o@ the )assage!a(*3 !hen valve is "ull( o)en, the disc is rotated a $uarterturn so that it allo!s an al5ost unrestricted )assage o"the uid*

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So5e E4a5)les o" Rotar( Valves

o

=lug Valve3 are valves !ith c(lindrical or conicall( ta)ered >)lugs>!hich can 'e rotated inside the valve 'od( to control o!through the valve*

3 )lugs have one or 5ore hollo! )assage!a(s goingside!a(s through the )lug, so that uid can o! through the)lug !hen the valve is o)en* 3 )lug valves are si5)le and o"ten econo5ical*

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 TE ENB*

 TANC YOUD