Cryogenic valve are specially engineered and designed for piping systems used in the storage and transport of liquefied gasses such as LNG and liquid nitrogen and oxygen. The main structural feature of these valve is an extended bonnet with an enclosed vapor chamber to isolate packing from the cryogenic fluid and thereby allow packing to function properly. PK Vlave Cryogenic designs and liquid nitrogen testing facilities go much further to assure proven performance in this most demanding application. Materials suitable for working condition must be adopted for low temperature VALVE. Especially in petrochemical industry, the types of fluids to be processed are different according to each section even in the same plants. At the same time, the temperatures used are also different. A full consideration must be paid to the selection of material. CRYOGENIC SERVICE VALVE MATERIAL BODY MATERIAL BOLT NUT SERVICE TEMPERATURE -50 -75 -100 -150 -425 -425 -425 -425 CARBON STEEL( GRADE LCB) C-1/2Mo( GRADE LC1) 2 1/2NI( GRADE LC2) 3 1/2NI( GRADE LC3) TYPE 304( GRADE CF8) TYPE 304( GRADE CF3) TYPE 316( GRADE CF8M) TYPE 316L( GRADE CF3M) A320 GR. L7 A320 GR. L7 A320 GR. L7 A320 GR. L7 A320 GR. B8 A320 GR. B8 A320 GR. B8 A320 GR. B8 A194 GR. 4 A194 GR. 4 A194 GR. 4 A194 GR. 4 A194 CR. 8 A194 CR. 8 A194 CR. 8 A194 CR. 8 -46 -59 -73 -101 -254 -254 -254 -254 ℉ ℃ As for the materials constituting the low temperature valve, special consideration must be paid to the materials used at pressure parts as in the case of body and bonnet. BODY AND BONNET CRYOGENIC VALVE PK_66
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CRYOGENIC · PDF filea479 - 316 316 s.s a320 - b8 cl.2 a194 - 8 a194 - 8m 316 s.s 315 s.s body bonnet disc arm rod pin body seat ring plug bolt gasket plug gasket bonnet bolt bonnet
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Transcript
Cryogenic valve are specially engineered and designed for piping
systems used in the storage and transport of liquefied gasses
such as LNG and liquid nitrogen and oxygen. The main structural
feature of these valve is an extended bonnet with an enclosed
vapor chamber to isolate packing from the cryogenic fluid and
thereby allow packing to function properly. PK Vlave Cryogenic
designs and liquid nitrogen testing facilities go much further to
assure proven performance in this most demanding application.
Materials suitable for working condition must be adopted for low temperature VALVE.Especially in petrochemical industry, the types of fluids to be processed are different according to each section even in the same plants. At the same time, the temperatures used are also different. A full consideration must be paid to the selection of
material.
CRYOGENIC SERVICE VALVE
MATERIAL
BODY MATERIAL BOLT NUTSERVICE TEMPERATURE
-50
-75
-100
-150
-425
-425
-425
-425
CARBON STEEL( GRADE LCB)
C-1/2Mo( GRADE LC1)
2 1/2NI( GRADE LC2)
3 1/2NI( GRADE LC3)
TYPE 304( GRADE CF8)
TYPE 304( GRADE CF3)
TYPE 316( GRADE CF8M)
TYPE 316L( GRADE CF3M)
A320 GR. L7
A320 GR. L7
A320 GR. L7
A320 GR. L7
A320 GR. B8
A320 GR. B8
A320 GR. B8
A320 GR. B8
A194 GR. 4
A194 GR. 4
A194 GR. 4
A194 GR. 4
A194 CR. 8
A194 CR. 8
A194 CR. 8
A194 CR. 8
-46
-59
-73
-101
-254
-254
-254
-254
℉ ℃
As for the materials constituting the low temperature valve, special consideration must be paid to the materials used at pressure parts as in the case of body and bonnet.
BODY AND BONNET
CRYOGENIC VALVE
PK_62PK_66
Following the body and bonnet, selection of materials for main parts such as stem, seat ring, and gland is very important. We adopt austenite stainless steel.
Teflon or other plastic packing protecting from shinkage by large cloumn of insulating gas.
Stellite 6 for all medium and high pressure application prevents seizing and galling.
Material for bolts at low temperatures requires especially strength. Therefore, rigidity at low temperature is demanded and brittleness at low temperature of steel material can be improved generally by heat treatment.We use it according to ASTM standard.
ASTM : A351-CF8, CF8M, CF3, CF3M or Equivalent
TRIM
PACKING
SEATING SURFACE
BOLT AND NUT
TABLE OF LIQUEFIED GASSES
PRODUCTION MATERIALS
TYPENATURAL GAS, LNG
METHANE, CH4
OXYGEN, O2
ARGON, AR
CARBON DIOXIDE, CO2
NITROGEN, N2
HYDROGEN, H2
HELIUM, HE
BOILING POINT
-270
-258
-296
-303
-314
-320
-423
-452
-168
-162
-183
-186
-192
-196
-253
-269
℉ ℃
CLASSTYPE
GATE
150 300 600 900 15002-48
2-36
2-48
1/2 - 60
2-60
2-36
2-48
1/2 - 60
2-52
2-36
2-30
2-36
1/2 - 48
2-24
2-20
2-24
1/2 - 36
2-16
2-12
2-16
1/2 - 24
25002-16
2-12
2-16
1/2 - 16
UNIT : NPS
GLOBE
SWING CHECK
BALLBUTTERFLY
PK_63PK_67
NO. PART NAME MATERIAL
GRAPHITE+GRAPHITE WITH INCONEL WIRESPIRAL WOUND / GRAPHITE+316+316