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The Secret Of TRUNNION BALL VALVE - Health - Nairaland

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The Secret Of TRUNNION BALL VALVE by valvinox: 5:30pm On Sep 17, 2020
3-Weg Electric Ball Valve (bore >8mm):For larger flow rates, such as central heating, irrigation, compressed air etc. The type of medium defines the material choice of the valve body and seals. Trunnion mounted refers to how the internal ball of a ball valve is mounted.

What is the difference between a trunnion and floating ball valve? In a trunnion ball valve, the ball has small protruding shafts at the top and bottom that are mechanically supported. AMCO” Ball Valves are Manufactured with Full Port/Regular Port constructions.

Valves of sizes above 2 inches have a cast body (the most common grades are ASTM A216 WCB for high temp. Reduced port ball valve creates a pressure drop in the pipeline. Side entry ball valves are easier to assemble and manufacture than top entry, which requires long experience and craftsmanship to work properly.

Top entry ball valves require more non-destructive tests than side entry due to their cast bodies; Top entry ball valves have a monolithic structure (are made by one single piece); side entry valves have a two or three piece assembly. Top entry ball valves are manufactured, generally, with cast steel bodies ; side entry valves are manufactured with (robust) forged steel bodies.

This is due to the fact that top entry ball valves allow easier and faster access to the ball and the valve trim compared to side entry valves (which require more maintenance time and space for the same operations). Design: floating, trunnion mounted and double bleed and block. These valves are not as precise as globe valves to throttle the fluid flow, as they generally have positive (at 0, 45 and 90 degrees) instead of incremental positions.

The difference between a ball valve and a gate valve is that the former uses a spherical ball to open/close the flow, the latter uses a disc sitting on a seat. When it is any other position, the valve is partly open (or partly closed) and is modulating the flow. Ball valves are key devices to shut-off and regulate the flow of a fluid (oil, gas, steam, etc) in the petrochemical industry.

In the image below, you can see the 3-way ball valve. A ball, seat rings, stem, and other internals set inside the larger body part and held together with smaller parts by bolting. In this design, a valve body is divided into two or three body parts.

The full-port ball valve has an inside diameter equal to https://www.italvalvinox.com/trunnion-ball-valve/ the inside diameter of the pipe. Check the video below to learn how this floating type valve works. This type of valve design is capable of bi-directional shut-off.

This small lateral movement, in fact, produces a load on the ball that presses it against the downstream seat which improves leak tightness of valve. The ball is free to float inside the valve body. But in case large size valve which required considerable force to open or close the valve, the gear-operated actuator is used.
Re: The Secret Of TRUNNION BALL VALVE by Cabardin: 3:27pm On Sep 08, 2021
Thanks for the explanation, I want to order one of these
Re: The Secret Of TRUNNION BALL VALVE by GabriellePeake: 3:31pm On Sep 08, 2021
A trunnion is usually used in ball valves when a low flow rate and a high temperature. In this case, the pressure on the ball valve reduces, and the pressure on the ball and seal increases. They are also used for valves that are in a vertical position.
Typically, a master can install the Trunnion Ball Valve horizontally or vertically. It is suitable for applications where quick replacement is required. It's sufficient for most manually adjustable taps to have the seal at the bottom and not in the center. It should be selected according to the pressure to be used.

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