A floating ball valve is a valve with its ball floating (not fixed by a trunnion) inside the valve body, it drifts toward to the downstream side and tightly pushes against the seat under the medium pressure to ensure sealing reliability. The floating ball valve has simple structure, good sealing performance but the seat material is required to withstand the workload since the sealing pressure is bared by the seat ring. Due to unavailability of high performance seat material, floating ball valve is mainly used in middle or low pressure application.

Design FeaturesReliable Seat Seal
The structure design of double-beveled sealing ring has been adopted to reduce the friction between the ball and the sealing ring to achieve lower operation torque.  When the medium pressure is low, the ball has smaller contacting surface with sealing ring, which introduces higher sealing pressure to ensure the sealing reliability. When the medium pressure gets higher, the contacting area between ball and sealing ring increases accordingly. Larger contact area reduces the sealing pressure to avoid the deformation of sealing ring.

 

Fire Safe Design
In case of fire, non-fireproof material for packing and seat will be burnt-out and considerable medium leakage may possibly cause fire spread. CRV adopted metal to metal seal as auxiliary structure to prevent medium leakage in case of fire as shown in figures. The fire safe design confirms to the requirements of API607, API 6FA and BS 6755.

VALVE DESIGN DATA

Size: 1/2"-20"

Nominal pres sure:  Class 150Lb-300Lb PN1.6-4.0MPa
Material:  WCB,LCB,CF8,CF8M,CF3,CF3M,A105,LF2,F304,F316,F304L,F316L
Design & Manufacture Std.:  API 608 、API 6D、GB/T1237
Face to Face Std.: ANSI B16.34 、API 608 、API 6D
Flange、Thread End Connection Std.: ASME B16.5、 ANSI B1.20.1
API 608 is intended to provide the similar additional requirements for steel and alloy steel ball valves beyond
ASME B16.34 as do the following API standards for other valve types:
API  594, Check Valves: Flanged, Lug, Wafer and Butt-welding
API Standard 599, Metal Plug Valves—Flanged, Threaded and Welding Ends
API Standard 600, Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries
API Standard 602, Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries
API Standard 603, Corrosion-resistant, Bolted Bonnet Gate Valves Flanged and Butt-welding Ends
API 609, Butterfly Valves: Double Flanged, Lug and Wafer-type 
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME B16.5, Pipe Flanges and Flanged Fittings NPS 
ASME B16.10, Face-to-Face and End-to-End Dimensions
ASME B16.11, Forged Fittings, Socket-welding and Threaded
ASME B16.20, Metallic Gaskets for Pipe Flanges—Ring-joint, Spiral-wound and Jacketed 
ASME B16.25, Butt Welding Ends
ASME B31.3  Process Piping
API 6FA  Fire Testing of Valves
API Std 598  Valve Inspection and Testing

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