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CAST STEEL PRESSURE SEAL STAINLESS STEEL BUTTERFLY CRYOGENIC  BELLOWS SEAL 
  

 
   
CRYOGENIC VALVES

CRYOGENIC SERVICE VALVES
For the use of LNG and other low temperature fluid, manufactured them in co-operation with KOREA INSTITUTE MACHINE & MATERIAL from 1983 to 1985.
To protect gland packing material from freezing or
shrinking, extended bonnet for thermal isolation are provided with all PK cryogenic service valves. This extension plays a role of insulating vapor column to keep stem packing materials functional. The dimension of such extension bonnet depends on the design temperature of the pipeline.
All valve parts are thoroughly cleaned and degreased, and the valve assembled with care to insure safety to the user. Pipe ends are sealed to prevent contamination.

MATERIAL
Materials suitable for working condition must be adopted for low temperature valves.
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.

BODY AND BONNET
As for the materials constituting the low temperature valves, special consideration must be paid to the materials used at pressure parts as in the case of body and bonnet.

GATE VALVES SWING CHECK VALVES
STANDARD MATERIALS STANDARD MATERIALS
CLASS 150 CLASS 150
CLASS 300 CLASS 300
CLASS 600 CLASS 600
CLASS 900 CLASS 900
CLASS 1500 CLASS 1500
   
GLOBE VALVES  
STANDARD MATERIALS
CLASS 150
CLASS 300
CLASS 600
CLASS 900
CLASS 1500

STANDARD MATERIAL SPECIFICATIONS:

TRIM
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.

PACKING
Teflon or other plastic packing protection from shrinkage by large column of insulating gas.

SEATING AND SURFACE
Stellite 6 for all medium and high pressure application prevents seizing and galling.

BOLT AND NUT
Materials for bolts at low temperature 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 standards.
 
TABLE OF LIQUIFIED GASES
TYPE BOILING POINT
°C °F
NATURAL GAS, LNG -168 -270
METHANE, CH4 -161.5 -258
OXYGEN, O2 -182.9 -296
ARGON, Ar -185.9 -303
CARBON DIOXIDE, CO2 -192 -314
AIR -194.4 -318
NITROGEN, N2 -195.8 -320
HYDROGEN, H2 -252.7 -423
HELIUM, He -268.9 -452

C. STEEL | PRESS. SEAL | STAINLESS | BUTTERFLY | CRYO | BELLOWS

Body material Service temperature Bolt Nut
°F °C
Carbon steel(Grade LCB) -50 -46 A320 Gr. L7 A194 Gr. 4
C-1/2Mo(Grade LC1) -75 -59 A320 Gr. L7 A194 Gr. 4
2 1/2Ni(Grade LC2) -100 -73 A320 Gr. L7 A194 Gr. 4
3 1/2Ni(Grade LC3) -150 -101 A320 Gr. L7 A194 Gr. 4
Type 304(Grade CF8) -425 -254 A320 Gr. B8 A194 Gr. 8
Type 304(Grade CF3) -425 -254 A320 Gr. B8 A194 Gr. 8
Type 316(Grade CF8M) -425 -254 A320 Gr. B8 A194 Gr. 8
Type 316(Grade CF3M) -425 -254 A320 Gr. B8 A194 Gr. 8

THE NEWDELL COMPANY
6300 West by Northwest Blvd., Suite 700 | Houston, Texas 77040-4941
713.590.1312 | 713.590.1319 fax | 1.877.510.7853 toll free

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