Teflon Seated Ball Valves v/s Metal seated

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Industrial ball valve selection is a very complicated part if the skilled person does not choose proper ball valves. A quick guide to understanding the differences Selecting a valve in an industrial environment is always a task. It involves many factors such as Application, MOC, Sizing, Design, etc. Based on these factors a valve is selected. Another important factor is the seat, which determines the performance and the life of the valve.

In ball valve, There are two types of valve seat options &#; Metal seated and Teflon seated. Well, both have equally good performance, ensure tight shutoff, and offer a very good life cycle. While selecting a valve, However, both have some different features based on which the Valve has to be selected.

Now we understand both types of Valves and understand their differences.

 

Metal Seated Ball ValvesMetal seated ball valves are very special valves After the lapping process seat will match the sphericity of the ball hence no leakage chance Metal seated ball valves are well-engineered Valves. Designed for the most demanding operational conditions. These Valves are widely used for conditions that require the highest safety.

Metal Sheet

Selection:-

Metal seated ball Valves are selected when the media is erosive in nature or has very high temperatures. Metal seats can endure severe flashing, hydraulic shock, abrasive process fluid, and high temperatures up to and even exceeding 1,000° F.

Coating:-

Stellite Seat Surface- recommended for service with severe flashing or hydraulic shock, abrasive media, or where the possibility of trapped metal in the media.

Key Features:-

Excellent performance in very high temperatures Can withstand abrasive media Ideal for applications that are erosive and corrosive in nature Teflon Seated Ball Valve Soft seats are generally made of thermoplastic materials like PTFE. These Valves ensure tight, stable sealing and offer convenient repair. Soft seated valves are relatively more economical as compared to metal seated Valves.

Selection:-

Soft seated Valves are selected where tight sealing is required. These Valves are widely used for media that are reactive in nature making these valves best suited for the chemical industry and gas industry.

Soft seats are not recommended for processes having high differential pressure, high temperatures, or media that are abrasive in nature as seats can break down in these conditions, causing the valve to leak.

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PTFE

Made from Virgin Teflon, this is the most common sealing material which offers excellent compatibility for almost all chemical media and is suitable for temperatures -50°F to 400°F.

Teflon Sheet

RPTFE

Reinforced with glass or other materials are suitable for temperatures -50°F to 450°F. Here chemical resistance is comparable to virgin PTFE but wear factor and temperature resistance are better.

Select the ball valves as per your application and product life number of times the valve opens or closes.

Where can I buy the best ball valve balls?

Brijesh Engineering serves you the best ball valve balls for your industrial use.

we also serve the best valve ball for industries.

Hard Seat and Soft Seat Safety Relief Valves

When to use Hard Seat Safety Valves VS. Soft Seat Safety Valves?

Hard Seat Safety Valve

A hard seat safety relief valve is a metal-to-metal seated valve. These typically use a metal disc or ball as the internal sealing surface against the orifice or internal passageway in a safety relief valve.

The ASME Boiler and Pressure Vessel Code does not require a specific seat tightness requirement. A certain level of leakage is allowed per manufacturers&#; published literature. Kingston defines seat tightness standards as follows: Factory Standard Seat Tightness Performance: Hard Seat Valves &#; no audible leakage at 20% below nameplate set.

A hard seat safety relief valve is excellent in corrosive or extremely high temperature applications. It is normal for spring-operated safety valves to exhibit leakage. The simmer/warn appears as the operating pressure approaches the nameplate set pressure. This is typically in the 80%-90% range of nameplate set pressure.

Soft Seat Safety Valve

A soft seat safety relief valve typically uses an elastomer material, such as Silicone, FKM (Viton&#;), EPDM (Teflon&#;), Nitrile (Buna-N) or PTFE. The sealing material in the internals of the valve will depend on the compatibility of media flowing through the valve.

The Kingston standard for soft seat valves is: no audible leakage at 10% below nameplate set pressure. At very low set pressures (20 psi and below), the ratio of the downward spring force as compared to the upward pressure force is very small. In these cases, it may be impossible to achieve seat tightness.

Use soft seat valves for superior seat tightness in applications which fall within the soft seat material temperature limitations. Although soft seat valves will typically provide a higher degree of seat tightness than metal seats, Factory Standard does not ensure bubble-tight seats, regardless of seat material.

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