FLOATING BALL VALVES
Floating ball valves are available from 1/4’’ to 6’’ – ASME class 150 to 1500 in several combinations of materials and execution to cover all possible service application.
Trunnion ball valves are available from 1/4’’ to 36’’ – ASME class 150 to 2500, API 5000 and 10000 in several combinations of materials and execution to cover all possible service application.
TIGHTNESS OF THE UPPER STEM
Dual sealing arrangement includes non metallic seal rings plus a graphite gasket at the static body closure interface. This seal arrangement ensures zero leakage and fire safety.
SELF LUBRIFICATING BEARINGS
Smooth self lubricated bearings ensure a low and constant working exertion. No lubricating is needed. The bearing in PTFE coated are designed to ensure an excellent service with the most aggressive working conditions. Special bearings can be provided on request.
Vent connection at the bleed valve outlet is plugged with a metallic screwed bleed plug fitted with a captive bleed screw.
ANTI BLOW OUT STEM
The stem of MD ball valves has an anti-blow out design as BS5351 specification. The pressure thrust on the stem is s upported by a washer in antifriction material (PTFE charged).
FIRE SAFE DESIGN
Ball valves have been succeeded to fire testing and are certified fire safe. Conformance to BS6755 part II, API607, EN ISO 10497, TOTAL SGM 2040 TUY SC01.
ANTI STATIC DEVICE
Electrical continuity assured between the ball, stem, body and other components. Different materials are used as conductive bridges.
SECONDARY SEALANT INJECTION FOR SEATS
6” and above.
Valves specified for standard service have a seat design including a resilient material insert at the valve seat such as DEVLON, PFA, PTFE, PTFCE, PEEK.
Single piston effect (self-relieving seats)
Fluid pressure, both upstream and d ownstream, creates a resultant thrust that pushes the seat rings against the ball. Fluid pressure acting in the body cavity creates a resultant thrust that pushes the seat rings away from the ball. The single piston design permits the automatic release of any overpressure in the body cavity when the valve is in the fully open or fully closed position. Consequently, the seat rings are «self-relieving.»
Double piston effect
Fluid pressure, both upstream and down-stream as well as in the body cavity, cates a resultant thrust that pushes the seat rings towards the ball. Valves with double piston effect seat rings require a relief valve to reduce the build-up of overpressure in the body cavity.
Valves designed for abrasive service or for operations in temperatures that prohibit the use of a resilient material have seating action provided by the metalto- metal contact between the ball and the seat rings. Seating faces are hardfaced.
In standard this valve can be supplied with high coating tungsten carbide thickness up to 400 Microns.
API 6D. - Specification for pipeline valves.
API 598 - Valve Inspection and Testing.
ASME B16.34 - Valves-Flanged, Threaded, and Welding End.
ASME B31.8 - Gas Transmission and distribution piping systems
ASME B31.4 - Liquid Transmission and distribution piping systems
ASME B16.5 - Pipe flanges and Flanged Fittings.
MSS-SP-44 - Steel Pipe Line Flanges
ASME B16.11 - Forged Steel Fittings – Socket-Welding and Threaded.
ASME B16.25 - Butt welding Ends.
ASME B36.10 - Welded and Sean less Wrought Steel Pipe.
ANSI/ASME B1.20.1 - Pipe Threads, General Purpose (Inch).
BS 6755 Part. 2, Specification for fire type-testing requirements.