Certification and inspection documents

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.

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.

Service conditions

High-pressure duty requires combined assessment of pressure-containing parts, seat loading and operator demand. Connections, fasteners and bonnet joints must suit the pressure-temperature combination, with differential-pressure changes and erosion considered during operation.

For forged-steel construction, match materials and manufacturing form to pressure, temperature and fluid conditions. Review bonnet, stem, sealing surfaces and end materials in addition to the body, using material and inspection requirements to define procurement.

Construction and description

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.