Two Piece Standard Locking Handle Ball Valve Dimensions DIN3202 ISO
1. Seat Strength:
A seat in-tension is stronger than a seat in compression. Because
the tensile strength of PTFE in-tension is 3600psi(25MPa) versus
only 1800psi (12.5MPa) for PTFE in compression. Greater strength
means less fatigue, Superior sealing ability and longer cycle life
2. Lower Torques:
Teyi "in-tension" Seats produce more uniform torque , because the
seat deflects into the cavity behind it to accommodate slight
differences in machining tolerances or the normal expansion of PTFE
as temperature increase. PTFE expands approximately seven times as
much as metal.
3. Cavity pressure relief:
Seats are designed to relieve overpressure in the ball/body cavity.
This capability is unfluenced by many variables including: fluid
characteristics, variations in pressure, seat materials, seat
compression, temperssure and thermal cycles.
Positive release of cavity overpressure to the upstream side is
assured in bypassing the upstream seat through a drilled hole in
the ball. This option is preferred in certain services such as
Pressure relief when the valve is in the open position is always
through the vent in the top of the ball adjacent to the stem
4. ISO 5211 Mounting Flange for Pneumatic actuator and Electric
. Design and manufature Standard: DIN3357
. Face to Face dimension standard: DIN3202
. Flanged Dimension Standard: DIN2543-2545 or DIN2501
. Pressure-temperature Standard: DIN2401
. Inspection and Test Standard: DIN3230
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