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valve blog 777
Wednesday, 22 July 2020
Trunnion ball valves application in petrochemical field

Trunnion ball valves application in petrochemical field

The trunnion ball valve is advised for any force class and its safe sealing can grant a top performance.

In the Trunnion design pattern, the ball is maintained by bearing plates, held in position by the valve closures. This configuration permits to discharge any side packs on the valve body, permitting a perfect action of the ball, decreasing the operating torque and decreasing seat seal wear.

The operation of the valve is forever on-off with ninety movement.

This configuration makes the valve perfect for handling by means of actuators.

The manual operation contains the use of gears or levers depending on the valve torques.

Independent floating spring packed seats are forever in contact with the ball to give a best tight seal. With the one piston effect design, there is a mechanical body cavity release of over force to the line through the downstream seat.

The twin piston effect design, maintains the sealing ability of the valve even in the case of crash of the upstream. Body cavity over force in this case can be released via a relief valve to atmosphere. The tightness is assured by the piston effect acting on the seat, forcing it against the ball, once the valve is forced.

Pre-loading springs make sure the start-up of the valve.

It is also easy to give the "metal-to-metal" ball seat seal, perfect for top temperatures and not filtered raw fluids, which otherwise, would destroy the soft seats.

Big applications in the petrochemical field:

·         Low temperature

·         Cryogenic service

·         Ambient temperature

·         High pressures

·         Corrosive fluids

These valves can be designed to meet the customer's needs, for example, they may be buried in the ground and made run by the extensions.

The mechanical anchoring of the ball grips the thrust from the line force, stopping excess friction between the seats and ball, so even at full rated working force operating torque remains low. This is mainly benefit when the ball valve is actuated for the reason that it decreases the size of the actuator and so the full cost of the valve actuation package.



Benefits of the trunnion ball design is the lower operating torque, simplicity of operation, minimized seat wear (ball/stem stops side loading and wear of downstream seats better performance and service life), best sealing performance at both low and high force (a separate spring device and upstream line force is applied as the sealing in opposition to the stationery ball for low force and top force applications).

The trunnion is accessible for all sizes and for all force classes but they are not perfect for throttling objectives.

Designed as a top end-severe service solution for the specialty and process markets, trunnion valve also serve specialty applications meet the specific customer needs. Utilizing the same live-loading and coating technology that built the series product line, but in a less-torque, really bi-directional is a wonderful solution for tough, top-cycling applications.

Posted by needlevalve0966 at 2:10 AM EDT
Updated: Friday, 7 August 2020 10:50 PM EDT
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