Ball Valve

Overview

A ball valve provides on/off isolation by rotating a bored ball one quarter turn between the open and closed positions. When the bore aligns with the flow path the valve is fully open with minimal pressure drop; rotating the Ball ninety degrees presents a solid face to the flow and shuts the line off bubble-tight. The floating-ball design uses line pressure to push the ball against the downstream seat, which makes shutoff tighter as differential pressure rises. This unit is flanged for inline service and driven by an Electric Actuator for remote operation.

Construction

The pressure boundary is a two-piece Valve Body: a main casting carrying one raised-face flange and a threaded end cap carrying the second, clamped together with a graphite-filled body gasket. The ball is captured between a pair of soft seat rings held in the Seat Set; Belleville springs preload each seat so it stays in contact with the ball at low pressure and through thermal cycling. Torque reaches the ball through the Stem Assembly, an anti-blowout shoulder stem that cannot eject under pressure even if the packing is removed, sealed by a PTFE-backed packing stack and gland.

The electric actuator couples to the stem through an Mounting Kit machined to the ISO 5211 bolt pattern, which standardizes the interface between valve and drive. A motor and worm reduction stage turn the stem, while limit switches and a position sensor report end-of-travel. For commissioning or power loss the Handle / Lever gives a manual quarter-turn override, and a Position Indicator dome shows open or closed at a glance. Assembly bolting is supplied as a matched Fastener Set.