AFTROL ball valves have bottom entry stem design. In blow out proof design the stem land sits on the integral land of the boby. The higher the line pressure, the tighter the seal. This design eliminates possibilities of accident. This design can offer safety features because it does not allow the seal to squeeze and break because of line pressure and temperature. This sealing system is virtually maintenance free but, if the necessity arises, then it can be easily retightened during service. In extreme cases the packing of the gland can easily be replaced.

The Belleville washers are installed under the stem nut. They are pre-stressed and ensure that stress is maintained on the stuffing box. This compensates the varying stresses on the sealing gland resulting from changes in pressure and temperature. This also gives excellent thermal conductivity.

PTFE seats are manufactured from closed grain structure Slots are provided in the seats to relieve the pressure passing the upstream seat and prevent it from being forced against ball. Deflection are provided in the seats. These both the features help in lower operating torques, permit higher differential pressure and reduce wear and increase life of the valves.

AFTROL ball valves are made from long lasting materials. And when necessary every part can be supplied as an individual replacement; there is no need to buy a complete new valve. Three piece body: this means that the centre part-which contains all moving parts-is easily accessible, So that component can easily be replaced.

Balls are manufactured to very close sphericity tolerances and mirror finish polished; results in bubble tight sealing and low operating torque.

“AFTROL” Ball valves are manufactured with oating ball or trunnion mounted . In oating ball design, the sealing takes place by allowing the ball to move towards the down stream seat under pressure by giving an effective tight seal. This design is internationally accepted by most of the process and utility application.

In this design the sealing takes place by allowing the seat to move towards the ball along the ow axis. Trunion mounted ball valves with soft seals are for critical process application. This design is preferred for higher sizes and the pressure rating for special services that require double block and bleed features.

These valves allow the online maintenance and installation by removing three body connector bolts and loosening the fourth bolt as a fulcrum, and the body can be swung away easily. Sometimes due to some chemical corrosion and sticky material the balls and seats gets jammed and in this design it can be easily replaced.

This design offers the unique advantage of eliminating the possibility of externalleakage to the atmosphere and internal leakage [vacuum] from the atmosphere through the bolted body joints. These are high performance valves. These high integrity valves are generally used in critical application such as toxic, expensive material, where external leakage or wastage is unacceptable.