Valve Selection

Given Below are the graphs which can be an easy guide for the selection of the valve pressure class suitable for a particular given temperature and pressure for the most commonly used materials- cost carbon steel (ASTMA 216 Gr.WCB) and SS-316 (ASTMA 351 Gr. CF8M).

Service Temperature

Class 150

Class 300

Class 600

Deg. FDeg. CWCB(a)WC1(b)(c)WC6(c)(d)WC9(c)(d)C5(c)WCB(a)WC1(b)(c)WC6(c)(d)WC9(c)(d)C5(c)WCB(a)WC1(b)(c)WC6(c)(d)WC9(c)C5(c)
-20 to-29 to               
1003828536529029029074069575075075014801395150015001500
2009326025526026026068066075075075013601320150015001500
30014923023023023023065564072073073013101275144514551455
40020420020020020020063564569570570512651230138514101410
50026017017017017017060558566566566512051175133013301330
60031614014014014014057055060560560511351105121012101210
65034312512512512512555053559059059011001065117511751175
70037111011011011011053051057057057010601025113511351135
75039995959595955054755305305301015955106510651065
8004278080808080410390510510510825780101510151015
8504546565656565320300485485485640595975975975
9004825050505050230200450450375460405900900745
9505103535353535135135320385275275275640755550
100053820202020208585215265200170170430535400
1050566  202020  145175145  290350290
1100593  202020  95110100  190220200
1150621  202020  657060  130135125
1200649  151515  404035  808070

Service Temperature

Class 900

Class 1500

Class 2500

Deg. FDeg. CWCB(a)WC1(b)(c)WC6(c)(d)WC9(c)(d)C5(c)WCB(a)WC1(b)(c)WC6(c)(d)WC9(c)(d)C5(c)WCB(a)WC1(b)(c)WC6(c)(d)WC9(c)(d)C5(c)
-20 to-29 to               
10038222020902250225022503705348037503750375061705805625062506250
20093203519802250225022503395330037503750375056555505625062506250
300149196519152165218521853270319036103640364054505315601560706070
400204190018452080211521153170307534653530353052805125577558805880
500260181017601995199519953015293033253325332550254885554055405540
600316170516551815181518152840275530253025302547304595504050405040
650343165016001765176517652745266529402940294045754440490549054905
700371159015351705170517052665256028402840284044254270473047304730
750399152014301595159515952535238526602660266042303970443044304430
800427123511751525152515252055195525402540254034303255423042304230
8504549558951460146014601595149024352435243526552485406040604060
9004826906051350135011201150101022452245187019151685374537453115
950510410410955116082568568515951930137011451145265532202285
100053825565065080059543043010801135995715715180022301655
1050566  430525430  720875720  120014551200
1100593  290330300  480550495  800915830
1150621  195205185  325345310  545570515
1200649  125125105  205205170  345145285

Note : (a) Permissible, but not recommended for prolonged usage above 800°F. Upon prolonged exposure to temperature above 800°F, the carbide phase of Carbon Steel may be converted to Graphite.

(b) Permissible, but not recommended for prolonged usage above 875°F.

(c) Use normalized and tempered material only.

(d) Not to be used over 1100°F.

(e) For welded and valved only. Flanged end ratings terminate at 1,000°F, for WC6, WC9, & C5 materials.

(f) 1 psi = 0.070 kg./Sq. cm.

ASME B 16.34

Maximum Allowable Non-Shock Pressure in psig

Service Temperature

Class 150

Class 300

Class 600

Deg. FDeg. CCF8(1)CF8M(1)CF8(1)CF8M(1)CF8(1)CF8M(1)
-20 to-29 topsigpsigpsigpsigpsigpsig
1003827527572072014401440
2009323023560062012001240
30014920521554056010751120
4002041901954955159951025
500260170170465480930955
600316140140440450885900
650343125125430440865885
700371110110420435845870
7503999595415425825855
8004278080405420810845
8504546565395420790835
9004825050390415780830
9505103535380385765775
10005382020355365710725
10505662020325360650720
11005932020255305515610
11506212020205235410475
12006492020165185330370
1250677202013514526295
13007042020115115225235
135075220209595185190
140076020207575150150
145078820206060115115
1500816151540408585

Service Temperature

Class 900

Class 1500

Class 2500

Deg. FDeg. CCF8(1)CF8M(1)CF8(1)CF8M(1)CF8(1)CF8M(1)
-20 to-29 topsigpsigpsigpsigpsigpsig
10038216021603600360060006000
20093180018603000309550005160
300149161516802690279544804660
400204149015402485257041404280
500260139514352330239038803980
600316132513552210225536803760
650343129513252160221036003680
700371126513052110217035203620
750399124012802065213534403560
800427121512652030211033803520
850454119012551980209033003480
900482116512451945207532403460
950510114511601910193031803220
1000538106510901770182029503030
105056697510801630180027153000
11005937709151285152521452545
11506216157101030118517151970
120064949555582592513701545
125067740044067073511151230
1300704340350656585945970
1350752280290465480770800
1400760225225380380630630
1450788175175290290485485
1500816125125205205345345
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