Cast Steel Globe, Stop Check, and Needle Valves for Nuclear Applications

Caractéristiques et avantages

Available for nuclear class 1, 2, and 3 and safety related applications.

Design features

• Unique non-rotating stem design is easily adaptable for actuation–with precision Acme threads and burnished finish. Valve suitable for horizontal installation.
• All sizes and pressure classes have conical seats to ensure tight shut-off.
• Seat face CoCr alloy hardfaced, ground, and lapped to a mirror finish. Conical seat machined to fine surface finish.
• Body guided disc ensures smooth, robust operation and accurately mates the seating surface of the disc with the surface of the body seat, which is ground and lapped to a mirror finish. When specified by the purchaser, the disc guides are hardfaced to enhance smooth guiding and extend their wear life.
• Body and bonnet castings are precision machined. One-piece bonnet(1) for better alignment, fewer parts.
• Body and bonnet joint accurately machined to the required serrated surface finish. Fully enclosed gasket.
• Gland has two-piece construction for easy alignment.
• Torque arm reduces wear on packing rings, enables better sealing and reduces torque.
• Rotating stem nut is austenitic ductile iron Gr. D-2C serviceable in line. When handwheel is used, thrust bearing arrangements vary depending on valve size and class.
• Impactor handwheels globe, stop check, and needle valves require higher closing torques than gate valves with the same seat diameter and pressure class. The most economical mechanism for tight shutoff is the impactor handwheel. Two lugs cast under the wheel strike simultaneous blows and give 3–10 times the closing force of standard handwheels. Impactor handwheels are supplied at manufacturer’s option unless specified by the purchaser.