VAHN-TECH Ball Valves are design with extensive safety considerations. Provision of locking devices, blow-out proof stems and prevention of misalignment of lever handles provide safe handling in the field. To ensure smooth plant operation, antistatic devices, fire safe seal design and cavity pressure relief features are provided.
Features
Lever Operated Switch Indicator
The lever is assembled to indicate the open/close position of the valve. When the lever is aligned with the pipe, the valve is open, when the lever is perpendicular to the pipe, the valve is closed.
Blow Out Proof Stem
The lever is assembled to indicate the open/close position of the valve. When the lever is aligned with the pipe, the valve is open, when the lever is perpendicular to the pipe, the valve is closed.
Antistatic Device
Internal parts that are 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 anti-static devices as an integral part of all floating ball valves.
Bubble Tight Sealing
Bubble tight sealing is achieved by the use of two rigid seats firmly secured in the valve body on either side of the ball. Media flow is cut off on the downstream side by upstream pressure pushing against the ball.
Fire safe Design
VAHN-TECH floating ball valves have all been 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.
Live Load and Double Packing Stem Seal Feature
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.
Equalised Cavity Pressure
The pressure equalization hole at the top of the ball combined with the seat design are both engineered to maintain the pressure balance in the line and in the body cavity while the valve is in the open position.
Specifications
| Design Standard | API 6D / API 608 |
| Size Range | 2” – 102” |
| Flow Bore | Full Bore / Reduce Bore |
| Pressure Rating | Class 150 – 900 |
| Working Temperature | -46˚C ~ +150˚C -50˚F ~ +302˚F |
| 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 |
