- BLOW-OUT PROOF STEM
AFTROL ball valves have bottom entry stem design. In blow out proof design the stem land sits on the integral land of the body. 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.
- OPERATING STEM SEAL WITH BELLEVILLE WASHERS.
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.
- ALWAYS LEAK-TIGHT PTFE SEATS
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.
- LONG LIFE, ECONOMY AND EASY SERVICING
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.
- MIRROR FINISHED STAINLESS STEEL BALL
Balls are manufactured to very close sphericity tolerances and mirror finish polished; results in bubble tight sealing and low operating torque.