Floating Resilient-Seated Ball Valve

Service conditions

A ball valve opens or closes the pipeline by rotating a ported ball. Port geometry, seats and stem sealing determine its operating behavior. Selection should consider differential pressure, fluid cleanliness and cycling duty together.

In a floating-ball arrangement the ball can move slightly under differential pressure toward the downstream seat. The seat provides sealing and carries fluid loading. Differential pressure, seat material and temperature changes therefore influence operating torque and seal selection.

A resilient or polymer seat seals against the ball surface. Evaluate temperature behavior, differential-pressure loading and fluid compatibility. Solids and frequent cycling also make seat wear and changing operating torque important.

Construction and description

Match the operator to the valve load and site operating method. Manual operation needs accessible clearance. Frequent cycling or remote control also calls for assessment of output capability, duty and position feedback.

Define fluid composition and continuous and start-stop operating conditions, then assess body, internals and seals as a combination. Particles, deposits and cleaning affect sealing surfaces and mechanisms; plan maintenance for the actual service.