2500 class Ball valves

Product Description

FULL BORE TRUNNION BALL VALVES

BASIC CONFIGURATION

ASME INTEGRAL FLANGED AND WELDING ENDS

TRUNNION BALL VALVE DESCRIPTION

The trunnion ball valve is a form of quarter-turn valve which uses a hollow, perforated and fixed/supported ball to control flow through it. A trunnion mounted valve means that the ball is constrained by bearings and is only allowed to rotate, the majority of the hydraulic load is supported by the System constraints, resulting in low bearing pressure and no shaft fatigue. The line pressure drives the upstream seat against the stationary ball so that the line pressure forces the upstream seat onto the ball causing it to seal. The mechanical anchoring of the ball absorbs the thrust from the line pressure, preventing excess friction between the ball and seats, so even at full rated working pressure operating torque remains low. This is particularly advantageous when the ball valve is actuated because it reduces the size of the actuator and hence the overall costs of the valve actuation package. Advantages of trunnion ball design is the lower operating torque, ease of operation, minimized seat wear (Stem/ball isolation prevents side loading and wear of downstream seats improving performance and service life), superior sealing performance at both high and low pressure (a separate spring mechanism and upstream line pressure is used as the sealing against the stationary ball for low pressure and high pressure applications). The trunnion is available for all sizes and for all pressure classes but they are not suitable for throttling purposes.

PRODUCT FEATURES

         Standard double block sealing performance.

         Full die forged structure for all pressure containing parts.

         Flanged valves are provided with flanged integral with closure member.

         Standard primary gasket design is OR AED type, secondary emergency seal always provided for firesafe purpose.

         High quality stem gasket for reliable tightness and low emission performance.

          Use of low seat-ball friction materials and surface finish for reliable sealing and long service life.

         Best-in-Class CV values.

         Standard split & bolted design for body-closure connection.

         Low operation torque design.

         Static conduction spring is used as standard between the stem and the ball (Antic-Static Device).

         Anti blow-out proof stem design.