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Spire specially adapted extended bonnet forged valves offer safe and efficient service including LNG liquefaction plants and receiving terminals as well as cargo systems of LNG and aerospace ground support facilities for liquid, hydrogen and oxygen.
All valves expect check valves are supplied with extended bonnet with a supplicant gas column length, usually specified by the user, to keep the stem seal packing exposed only to vapor and not the cold liquid to ensure functional integrity.
Pressure Rating: Up-to Class 2500#
Sizes: NPS 1/2” to 12” (DN15 to DN 300)
Body and Bonnet: Austenitic stainless steel forgings used for bodies and bonnet after excellent impact strength, minimum heat loss and protection against corrosion. For cast steel valves radiographed castings are used only from specially approved foundries.
Stem: To reduce galling, stem are made from advance Nitronic 50 with high tensile even at extreme low temperatures, excellent low friction and galling – free movement at points of stem contact. Alternative 316L stems are used for less demanding applications.
Wetted Parts: All austenitic stainless steel. On small 1/4 - 2”forged valves, seat, wedges or discs are often Stellite 6.
Yoke Bushing: Bronze or D2
Packing: PTFE or other plastic packing protected from freezing by a column of insulating gas. For fire safe operation a secondary packing is provided using graphite.
Seating Surface: Stellite 6 is used to prevent seizing and galling. When extremely tight shutoff is required, valves are supplied with CTFE, PTFE or other soft inserts.
Bolting: Strain hardened Austenitic stainless steel.