|DESIGN STANDARD||API 6D / ASME B16.34|
|SIZE RANGE||2” – 24”|
|FLOW BORE||Full Bore / Reduce Bore|
|BODY STYLE||Side Entry / 2-piece / 3-piece / Bolted Type|
|PRESSURE RATING||Class 150 – 900|
|WORKING TEMPERATURE||-46˚C ~ +150˚C|
|END CONNECTION||ANSI B16.5 - Flange ASME B16.25 - Butt-Weld ASME B16.11 - Socket-Weld / Threaded Ends|
|FACE to FACE||ASME B16.10|
|FIRE SAFE||API 607|
|TEST & INSPECTION||API 598 / API 6D|
VAHN-TECH Ball Valves are designed with extensive safety considerations. Provision of locking devices, blowout proof stems, and the prevention of misalignment of lever handles provide safe handling in the field. Antistatic devices, a fire safe seal design, and cavity pressure relief features ensure smooth plant operation.
The lever is assembled to indicate the open/close position of the valve. When the lever aligns with the pipe, the valve is open; when the lever is perpendicular to the pipe, it is closed.
VAHN-TECH has a provision for mounting a locking device to prevent operational mistakes.
The lower end of the stem is designed with an integral collar to be blowout proof. It also functions as the backseat for secure stem sealing.
The internal parts insulated from the valve body by non-conductive seat and seal materials may build up a static electric charge. To ensure electrical continuity between the stem and the ball and body, VAHN-TECH includes antistatic devices as an integral part of all floating ball valves.
Two rigid seats are firmly secured in the valve body on either side of the valve to create bubble-tight sealing. Media flow is cut off on the downstream side by upstream pressure pushing against the ball.
VAHN-TECH floating ball valves are all proven to be fire safe to API 607 or API 6FA. Full metal-to-metal contact is attained at all sealing areas after the primary soft seals have been destroyed during a fire.
VAHN-TECH floating ball valves feature live-loaded, self-adjusting primary and secondary sealing. Utilizing Belleville washers, the stem seal automatically adjusts to compensate for changes in temperature and normal wear.
The primary seal is a combination of a thrust bearing and thrust washer. An adjustable stem packing creates a secondary seal between the stem and body.
The pressure equalization hole at the top of the ball combined with the seat design maintains the pressure balance in the line and the body cavity while the valve is in the open position.