Three-Piece Female-Threaded 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 performance. Selection should consider differential pressure, fluid cleanliness and cycling duty together.

Configuration

A three-piece ball valve separates the central body from its end pieces. This arrangement provides options for assembly and service. Actual access depends on the end connections, fasteners and piping layout; check central-body removal space and seal-replacement requirements.

Select the manual operator or actuator to suit the valve torque or thrust requirements and site operating conditions. Provide access and clearance for manual operation. For frequent cycling or remote operation, assess actuator output, duty cycle and valve-position feedback.

Service conditions

Threaded interfaces require matching thread form, size and sealing method. Select sealing material for the fluid and temperature, and consider assembly torque and support of adjacent piping.

Specify the process-fluid composition and steady-state, startup and shutdown conditions, then evaluate the body, wetted internals and sealing materials together. Solids, deposits and cleaning procedures can affect sealing surfaces and operating mechanisms. Base the maintenance plan on the actual service conditions.