Vihung - Model API 6D -Top Entry Ball Valve

GENERAL CONSTRUCTION
VIHUNG Top Entry valves are suitable for compression and re-injection systems, transmission pipelines, metering skids, Pig-launchers and receiving stations, Offshore and On-Shore platforms, gas storage and separations systems suitable for a wide range of high risk industry applications from severe abrasive and slurry to high temperature and cryogenic services, from subsea and LNG plants to topside installations. VIHUNG Top Entry valves can be welded directly onto the pipeline or to the manifold.

MATERIALS OF CONSTRUCTION:

• Low Temperature and Low Alloy Carbon Steel
• Stainless steel, Duplex and Super Duplex
• Nickel alloys
• Titanium
• Bronze
• Body Material: A216 WCB/LCB/WC6/WC9/CF8/CF8M/CF3/CF3M/4A;SA/6A;A10S,A3S0 LF2.A182 F304/F316/F316L/F317/F321/F51/F51/F53/F55
• Ball and Stem Material: ASTM A182 F6A/17-4PH/XM-19/A182 F51/A182 F53/A182 F55
• Seat: RPTFE/DEVLON/PEEKMTON/METALTO METAL

EMERGENCY SEALS:
For trunnion mounted ball valve size NPS6 (DN 150) and above, it comes with provisions for sealant injection on both the stem and seat while for sizes NPS 5 (DN 125) and below on body cavity. In case of failed underperform seals, a temporary emergency seal can be achieved by injecting sealants.

ANTI-STATIC:
Because the ball and stem in a ball valve are suspended on non-metallic parts, i.e. the seat seal and stem seal, there is a possibility a static charge may build up on the stem-ball, a mechanical (antistatic metal spring and ball) is introduced in the design to maintain the metal-to-metal contact between the rotating ball/stem and the valve body which will ground any charges to the valve body

BLOWOUT PROOF STEM
The valve stem is made with a shoulder at the bottom end. It`s securely retained by the stuffing box, to avoid that the stem, under certain operating conditions, accidentally blows out. Other designs are available on request.

FIRE SAFE DESIGN:
During a fire, non-metallic soft material will be burnt, subsequently seat leakage or external leakage may occur and cause the fire spread or contaminate the environment. Our ball valves are fire tested in accordance with API 6FA or API 607, witnessed and certified by TUV SUD. If valve is not covered according to the standards, they are designed to be fire safe