Fully Welded Ball Valves Type 58 & 59

About this product

TECHNICAL FEATURES Type 59/58 (*) available with extra cost Trunnion mounted ball valve When the ball is in fully closed position, two trunnions absorb the side thrust generated by line pressures, preventing excess friction between ball and seats. With this system, even at full rated working pressure, operating torque stays low. Therefore a generous sizing of trunnions is essential to the life and operability of the valve. The spherical surface is machined and ground to close tolerance. To reduce torque and minimize wear, the ball is then electroless nickel plated and polished to mirror finish. For special applications the ball may be hardfaced with T.C.C. (Tungsten carbide coating) to improve resistance to wear and prevent scratching caused by hard particles. TECHNICAL FEATURES Emergency stem and seat sealant injection In case of emergency, when sealing materials (seat sealing and stem o-ring) are damaged or decomposed by fire or other accidental causes, a sealant injection into fittings on both stem and seat prevents leakage until the primary seal is restored. For Type 59 ball valve the seat sealant injection is an optional feature available with an extra cost. However, the material between ball and seat is a thermoplastic, thus no further injection is necessary. Self lubricated, low friction materials are used for stem bearings, stem seals and body seats. Low friction materials, e.g. nylon, are used for seat inserts. Stem bearings and self-lubricating seals give predictable operating torque for the life of the valve. Stem The stem is made separately from the ball. It is blow-out proof, properly obtained with an integral collar in the bottom of the stem. Stem Seal Sealing system can be defined triple: two static o-rings seal the stem, plus a third graphite retained by the adaptor flange. This ultimate seal can be replaced when the valve is in line and in closed position. Seat design Type 59 "59" Sealing Principle The sealing between the seat and the ball is performed by a plastic polymer insert. The choice of this soft sealing depending on the service conditions. The initial seal, at low differential pressure, is obtained by the spring loaded floating seats (spring energized) which achieve independent sealing. Increasing the line pressure behind the upstream seat ring helps the seat spring load to force the upstream seat tightly against the ball. "58" Sealing Principle The sealing between the seat and the ball is performed by a primary metal to metal seal, and a secondary O-ring seal for both the seats. The choice of the secondary seal "soft sealing" depending on the service conditions. The initial seal, at low differential pressure, is obtained by the spring loaded floating seats (spring energized) which achieve independent sealing. Increasing the line pressure behind the upstream seat ring helps the seat spring load to force the upstream seat tightly against the ball. Seat design Type 58 Fire safe design and test Fire safe is standard design of Valvitalia ball valve. Two o-ring and gland gasket prevent leakpaths from the valve stem area. If fire deteriorate o-ring, gland gasket, the stem firesafe packing prevent fluid or gas leakage. Valvitalia soft seat ball valve fire safe test (shown in the image) was witnessed and certified according to API6FA - BS 6755 PT.2 Fire safe test Antistatic device detail Anti-static device This device is a standard feature of VALVITALIA ball valves. A coil spring thrusts a little sphere, providing earthed continuity between stem and other metallic components of valve (ball and body) in order to avoid sparks during turning of the stem for opening and closing the valve and prevent problems in case of use with flammable fluids and gas. TECHNICAL FEATURES Body vent and drain The drain and vent plug of the valve body enable to check the integrity of the seat ring. A bleed valve may replace the drain plug. Double block and bleed VALVITALIA design of a valve with two seating surfaces between which the cavity can be vented trough a bleed connection and thus confirm the tightness of the valve, as well in closed position as open position, when pressure is applied to any side or both sides of the valve. Double piston effect (59-option, 58-standard) With the DPE seat configuration when there is a leakage in the upstream seat, the pressure entering into the body cavity pushes the downstream seat against the ball and the valve seals. This effect is a sealing principle involved in utilising line pressure to effect a seal across the floating seat. A relief valve is recommended to be installed to protect the body cavity from excess pressure. Self relieving seat (59-standard, 58-option) In self relieving condition, excessive internal body pressure is automatically relieved both in upstream and downstream line by forcing the seats away from the closure element. First barrier Second barrier STD. MATERIAL SELECTION Type 59 NOTES: 1) ELECTROLESS NICKEL PLATED 0.001" THICKNESS. 2) NYLON INSERT ON CLASS 900/1500 3) FOR LEVER OPERATED VALVES 4) FOR GEAR OR ACTUATOROPERATED VALVES SERVICE: STANDARD FLUID - CARBON STEEL VALVE - FIRE SAFE DESIGN TEMPERATURE: - 7°C +160℃ (-7℃ + 121℃ FOR CLASS 900-1500) Type 58 NOTES: 1) ELECTROLESS NICKEL PLATED 0.001" THICKNESS. 2\) NYLON FOR CLASS 1500 3\) VITON AED FOR CLASS 600 AND ABOVE SERVICE: STANDARD FLUID - CARBON STEEL VALVE -FIRE SAFE DESIGN TEMPERATURE: - 7°℃ +160℃ (-7℃ + 121℃ FOR CLASS 900-1500) STD. MATERIAL SELECTION Trim materials for general service (sweet fluids) FULL CARBON STEEL Trim materials for corrosive services (comply to NACE MR 01-75) STAINLESS STEEL TRIM Trim materials for highly corrosive services 13% Cr. STAINLESS STEEL TRIM Trim materials for corrosivo services (comply to NACE MR 01-75) FULL STAINLESS STEEL VALVE Note: (2) NYLON FOR CLASS 900-1500 Alternative material selections available upon request. STD. MATERIAL SELECTION Trim materials for corrosivo services (comply to NACE MR 01-75) FULL DUPLEX STEEL VALVE Trim materials for low temperature with stem extension FULL STAINLESS STEEL VALVE Trim materials for cryogenic temperature with stom extension FULL STAINLESS STEEL VALVE Note: (2) NYLON FOR CLASS 900-1500 Alternative material selections available upon request. BALL VALVES TYPE 59 (Overall Dimensions) \+ To be confirmed after P/O placement. \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. BALL VALVES TYPE 59 (Overall Dimensions) TYPE \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. \+ To be confirmed after P/O placement. BALL VALVES TYPE 58 (Overall Dimensions) \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. BALL VALVES TYPE 58 (Overall Dimensions) \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. BALL VALVES TYPE 58 (Overall Dimensions) TYPE \+ To be confirmed after P/O placement. BALL VALVES TYPE 58 (Overall Dimensions) \+ To be confirmed after P/O placement. TYPE \+ To be confirmed after P/O placement. SPECIAL APPLICATIONS Underground Installation • Stem extension can be required for VALVITALIA ball valve. • This feature permits use of valves in remote area, e.g. for underground installation. • VALVITALIA can provide any kind of stem extension, with piping and fittings suitable to raise the body drain, the body vent and the emergency sealant injection fittings up the stand floor. Operating Unit Subsea service • Special materials and protective overlays for extended life of service. • Reliable product in order to provide long lasting service without maintenance. • Additional sea water gaskets protect stem and external sealing areas. • Special protective coatings. Cryogenic service • Use range up to minus 196 ℃. • Assure the maneuverability at low temperature. • Materials and dimensions are specially designed to suit low temperature. Gas test facilities