- The Flowserve Valtek Mark Six is a globe-style, single-seat, top-entry automatic control valve with a fabricated extension for cold box cryogenic ap-plications to -425¡ÆF/-218¡ÆC. Mark Six bodies are constructed of bronze or austenitic stainless steel for high impact strength at low temperature and mini-mum heat transfer. Mark Six is designed for high flow capacity with a minimum of mass to reduce boil-off on valve cool-down.- The Mark Six extension design permits easy access and removal of the valve trim without breaking down the cold box. During operation, a small amount of liquefied gas passes into the extension bonnet area where it vaporizes and insulates the packing from the liquefied gas temperature. The pressure resulting from the vaporization of the liquid prevents addi-tional liquid from passing into the bonnet area.- The Mark Six is equipped with a standard, high-per-formance Valtek cylinder actuator, providing high thrust for tight shutoff and exceptionally accurate control.
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