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 MOUNTED

Trunnion ball valves are available from 1/4’’ to 36’’ – ASME class 150 to 2500, 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.

CAPTIVE BLEED

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).

 

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.

SOFT SEAT

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.

METAL SEATED

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.