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LNG Cryogenic Ball Valve Extend Stem for Low Temperature

Short Description:

Cryogenic Floating Ball valve Extend Stem

Body Forged stainless steel A182 F304,Ball A182 F304,Seat ring A182 F304,

Seat Soft Seat RPTFE, Stem A182 F304 extend Length 200mm, O ring PCTFE,

Gasket Graphite+316SS, Packing PTFE, Bolt &nut A193 B8/A194 8

Medium:Liquid nitrogen/liquid oxygen/liquefied natural gas


Design Feature

Specification

Product Tags

QL Cryogenic ball valve design feature

The cryogenic ball valves has the special design structures meet to such service safety use.

● The cryogenic valves designed with extended stem and water drip pallet in stem.

● The drip pallet can prevent the water vapor in the air from liquefying and then water flows to the valve surface and freezing, causing valve damage.They are applied to ensure the sealing performance of packing box and normal operation of ball valves . It also reduces the heat transferred from the outside to the inside of the device.

● Extend stem calculation according to SHELL SPE77/200/BS6364. The extend stem which is related to the thermal conductivity of the material, the thermal conductivity area, the surface heat dissipation coefficient and the heat dissipation area. The extend stem allows enough space for insulation material and ensures the stem packing sound sealed above 0℃.

● Low emission packing,prevents leakage around stem and ensure fire safe.

Cryogenic Floating Ball Valve (2)

Fig. Extend stem and Drip Pallet

Main Parts Material

BODY LCB/LF2 LC3/LF3 CF8/F304 CF8M/F316
BALL F304 F304 F304 F316
STEM F304 F304 F304 F316/XM-19
SEAT

PCTFE/RPTFE/PEEK

PACKING

PTFE/ GRAPHITE

BOLTING

A193 L7/A194 4

A193 B8/A194 8 A193 B8M/A194 8M
dfb

Since cryogenic ball valves are used in low temperature conditions, the valve must be fully dried before delivery. The test medium in factory usually is be helium gas.If there is any liquid in valve body, the liquid will risk freeze at low temperature and will generate pressure on the internal components of the valve. The pressure will damage the valve sealing and pipeline damage risk. It’s also the reason why the cryogenic ball valve valve is replaced by the air pressure test instead of hydraulic test on site test. The construction site test facility is quite limited and the valve need be strictly dried before use.

Application

QL Cryogenic ball valves designated in highest performance and produced in strictest quality, can meet the highest standard cryogenic service,and wildly applied for safety transportation for processing,storage,shipment and distribution of ethylene,Liquid Nitrogen, Oxygen, LPG, Liquefied Natural Gas (LNG) and other low temperature liquefied gases.

As an efficient and storable clean energy, LNG has shown broad development prospects in all aspects of the industrial chain. Cryogenic ball valve is most demanding valve in the cryogenic liquid storage and transportation equipment system. It has the advantages of flexible switching, reliable sealing, safety and stability etc.

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Crygenic Treatment And Test

The valve parts for cryogenic service need do the cryogenic treatment to make sure the valve material performance will suitable for low temperature.

The cryogenic treatment is the process of putting valve parts to  low  temperatures by medium nitrogen -196 ℃ in order to remove residual stresses and improve wear resistance in steels.

QILONG cryogenic treatment for ball valve part and cryogenic test for finished valve .

crygenic test 1 (1)
crygenic test 1 (5)
crygenic treatment and test 1 (6)
Cryogenic DBB Ball Valve 3

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  • Production Range Cryogenic floating ball valve
    Size NPS 1/2″~8″ (50mm~200mm)
    Pressure ASME Class150~600LBS (PN16~PN100)
    Production Standards API/ANSI/ASME/EN/DIN/BS/GB/GOST
    Design & MFG code BS6364/ SHELL SPE 770200 Low temperature valveAPI 6D/ASME B16.34 /ISO17292/ ISO 14313/BS5351
    Face to Face ASME B16.10,EN558
    End Connection FLANGE RF/RTJ ASME B16.5/EN1092-1/GOST 33259 ;BUTT WELD BW ASME B16.25
    Test & Inspection ISO 15848/SHELL SPE 77/312 Low temperature leakage testAPI 598, API 6D,ISO5208/ISO 5208/EN12266/GOST 9544
    Material code Low Temperature Carbon Steel -40℃ (ASTM A350 LF2/LF3, ASTM A352 LCB/LCC)Low Temperature Carbon Steel -101℃ (ASTM A350  LF3, ASTM A352 LC3)Stainless steel -196℃ (ASTM A182 F316/F316L/F304/F304L DUAL GRADE, ASTM A351 CF8M/CF3M,CF8/CF3)
    Operation Manual, Worm Gearbox, Pneumatic actuator, Electric actuator,Hydraulic-electric actuator
    Special design Cryogenic ball valves
    low temperature to -196  
    Extend bonnet for reliable packing and sealing,extend stem length acc. to temperature
    Extend stem with drip pallet design acc. to temperature
    API6 24 Low fugitive emission packing
    Live load API 622 graphite
    Body cavity pressure relief system
    Floating ball  type  one way sealing
    Trunnion ball type Double bleed and block,bidirectional sealing
    Basic design ball valves
    FIRE SAFE API 607
    ANTI STATICS API 608
    Stem feature Anti blow out proof
    Bonnet Construction Bolted bonnet
    Ball type Side entry or top entry or double block & bleed balls
    Bore type Full bore or Reduced Bore
    Optional customize NACE MR0175, MR0103, ISO 15156  compliance
    ISO 5211 MOUNTING PAD Bare shaft
    Limit Switch
    Lock device
    ESDV service suitability
    ISO 15848-1 and ISO 15848-1 Low fugitive emission test
    Non-destructive test (NDT)  API 6D, ASME B16.34
    Third party inspection test report
    Documents EN 10204 3.1  MTR Material  test report
    Pressure inspection report
    Visual and dimension control report
    Product warranty
    Valve operation manual
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