Floating Ball Valve Seal Pressure Calculator

Sealing specific pressure verification: must-pressure qb, design pressure q, and allowable [q] check for PTFE seat floating ball valve.

qb = m·(a+c·P)/√b where b = t·cos(φ)
q = (D2+D1)·P / [4·(D2−D1)]
Pass: qb < q < [q]

Input Parameters

Material Constant m mm

Constant a -

Constant c -

Design Pressure P MPa

Seal Width Projection t mm

Contact Angle φ deg

Seal Outer Dia D2 mm

Seal Inner Dia D1 mm

Allowable Pressure [q] MPa

Seal Face Width b mm—

Must Pressure qb MPa—

Design Pressure q MPa—

Allowable [q] MPa—

qb < q < [q]—