Weld Body and Bolted Body Ball Valves
Size 6 in.(150mm) up to 32 in.(800mm)
Forged welded body type
Size 6 in.(150mm) up to 36 in.(900mm)
Forged split body type
Size 36 in.(900mm) up to 48in.(1200mm)
Forged welded body type
Pipeline Ball Valve (API Spec 6D)
Valve Type: trunnion-mounted, quarter-turn, soft-seated, fire-safe design
Body Constructions: Welded body and Split-body type and Top-Entry type
Size: 6" to 48" (DN150~1200) and larger
Type: WB1 & WB, BB1, BT
Rating: ANSI Class 150# to 900# (PN20 to PN150)
Temperature: -60C to 250C (-76~482°F)
Design and Tests: API 6D & DIN 3230
Fire-Safe: tested design to API 607 and API 6FA and BS 6755: Part2
Materials: ASTM, DIN
Oil, Gas and Water Pipelines: Main & Transfer Lines, Manifolds, Compression & Pumping Stations, Launcher & Receiving Traps, Metering Systems.
Offshore: Subsea Pipelines
Double Block and Bleed: the fluid entrapped in the valve body is bleedable with the ball in fully closed position to API Spec 6D provisions.
Valve Bore: Valve are of full or reduced bore design. Reduced bore is of Venturi type. Minimum bore size is to API 6D requirements.
Body Structure: The manufacture of the body is of three types: split-body or welded-body or top-entry. The split or welded body design is used for valve side-entry type. It consists of three forged steel pieces joined by bolting or welding respectively. The body of valve top-entry type is made of one cast steel piece.
Antistatic Design: Stainless steel springs ensure the electrical continuity between all the valve metal parts (e.g. body, ball, seat rings and stem) which could be isolated by elastomeric or thermoplastic seals.
Pressure unbalanced ball : Unless otherwise requested, no hole is provided for the ball to equalize the pressure of the fluid in the pipeline to the one of fluid entrapped in the body cavity when the valve is open. It enables a preventive maintenance, allowing the check of the ball seating efficiency in any valve position, with no modification of the pipeline working condition.
Anti-blowout stem design: The stem, detachable from the bal, is blow proofed thanks to an integral abutment resting against the bonnet through a self-lubricating thrust washer.
Bi-directional seat rings: Each seat ring is independent floating type and suitably designed to shutoff the fluid aside from its pressure distribution through the valve. So both seat rings constitute a double barrier to the fluid, because of the downstream seat ring ensures shutoff of the fluid in case the upstream one fails. As any overpressure of the fluid entrapped in the valve body cannot be released back into the pipeline, a relief valve is fitted to the vent connection if the handled fluid is a liquid.
Ball seating: Valves with rating lower than ANSI Class 1500# have a seat insert made of elastomer to enable double ball sealing: a primary of metal-to-metal and a secondary of soft type (Fig.a). Valves with higher rating are provided with a seat insert made of thermoplastic resin (like Nylon or filled PTFE) to ensure a soft bubble-tight only against the ball (Fig.b). In addition, a double plastic+elastomer seal is recommended for valves having a stainless steel trim with no plating to be used in very low pressure service (Fig.c).
Double Seal of stem: Two elastomeric O-rings provided with backup in PTFE perform a double stem barrier to the fluid. The outer O-ring can be replaced with the valve under pressure.
Emergency seals: Both seals of stem and seat rings can be reinstate in case of damaging by injecting a suitable sealant grease through ports machined in the valve body and bonnet. Grooves and channels are machined in the seat rings suitably to distribute the sealant along the damaged seals. Check valves are buried into the injecting ports, which are equipped withgiant button head fitting for a fast connection to a greasing pressure gun.
Operability: All valves are operable with a manual gearbox or with any quarter-turn power actuator type.
Fire-safe tested design: It is a standard provision for all valve models. The use of fluorocarbon elastomer (like Viton) with no graphite backup for trim and flanged body joints enables the valves to overcome fire testing. Test certificates are available on request.
Bleeding Joints: Each valve is provided with drain and vent ports, which are plugged or valved to meet the requested serviceability.
Self-relieving seat rings: When any overpressure of the fluid entrapped in the valve body shall be automatically relieved back into the pipeline, valves are equipped with seat rings of self-relieving design.
Stem Extensions: Valves to be installed underground or buried are equipped with a stem extension assembly, whose outer casing is equipped with relief valve and drain plug. Connections for bleeding and sealant injection of the valve body are suitably extended with valved piping too.
Transition pieces or pups: Valves to be connected to pipeline by welding in accordance with special procedure or subjected to thermal stress relieving (P.W.H.T) are equipped with pups made of pipe or forging.
Sour Service: Valve are supplied with materials in compliance with NACE MR-01-75 requirements.
(1）Service covered by NACE MR-01-75 Code requirements（limited hardness）.
(2) Elastomeric seals are not permitted.
(3) It is used for valvesto be butt welded to high-strenght piplines.
(4) ENP=Electroless Nickel and/or Chrome Plating.
(5) Hard plating is needed when erosive phenomena are present.
(6) Selection of gasket material is according to the following temperature ranges: Therban (HNBR) for T=-45C up to +175C; Viton GF for T=-40C up to +220C; Nitrile (NBR) for T=-29C up to+130C; Viton (FPM) for T=-20C up to+220C; PTFE for T=-200C up to+240C; Nylon 12 G for T=-50C up to+120C; Kel-F for T=-250C up to+150C.
(7) Nylon 12 G or reinforced PTFE is used for valves ANSI>900.
(8) Seat insert made of PTFE reinforced with glass or graphite fibers is supplied on request.
(9) Special elastomers are supplied on request to prevent" explosive decompresion" phenomena.
(10) Spiral wound gasket (AISI 316+Graphite) is used for body seals.
Above materials may be changed without any notice.
The "Technology License and Technical Assistance Contract between Nuovo Pibnone S.p.A. and our original factory." for introducing GE Nuovo Pignone top valves manufacturing technology in the world of America Universal Electric Company was signed.