Features

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.

 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. Utilising 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 equalisation 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.