Body material: ASTM A105N
Severity Service
Normal soft-seated valve can not be used for abrasive service or for operation under high temperatures that prohibits the use of a resilient material. VIZA metal-to-metal seated floating ball valve (series FM/FM-H, range 1/2 Inch - 4 Inch Class 150 & 300 LB, 1/2 Inch - 2 Inch, Class 600 LB) is designed for this type of severity service has seating action provided by the metal to metal contacting seating action is provided between ball and seat ring.
General Design
Blow-out proof stem, anti-static device are designed as standard requirements.
Superior Sealing
High precision machining and seat to ball rubbing, as well as adopt seat spring structure, which push up stream seat tightly against the ball surface, result in superior ball and seat interfacing for reliable sealing conforming to ANSI/FCI 70-2 class V.
Stem Seal
Belleville spring acted gland provides live-loading on stem packing. Equipped with Special low emission packing, the environmental friendly valve is available on request.
Reliable Operations
Spring-loaded seat maintain close contacting with the ball ensuring tight sealing even at low pressures. This also results in stable operating torques at high differential pressures over a wide range of temperatures or/and high frequency.
Material Selection
Various materials can be chosen from for the ser vice up to 500°C. For ser vice temperature above 300°C the extension bonnet is required.
Fire Safe
The features of metal seated and graphite sealing to guarantee to pass requirement of fire safe testing.
Applications
Hard faced ball and seats (TCC as standard, other special coatings are available on request) allow the valve to be used in more severe ser vices such as slurries, pulp stock, mining and other abrasive media in long life.