Metal Seated Ball Valves - SIO
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  • Metal Seated Ball Valve
  • Metal Seated Ball Valve

Metal Seated Ball Valves

High Velocity Oxygen Fuel (HVOF) coating. Coatings available are Chrome Carbide and Tungsten Carbide achieving very high hardness values of 70+ HRC , bond strengths of up to 25,000 psi and can be used in applications up to 815 deg C / 1500 deg F. These coatings have extremely good wear and abrasion resistance at high temperature. Available in Floating and Trunnion Mounted designs, Split body or Top Entry, Fire Safe, Full / Reduced Port, Lever operated, Gear Operated or Actuated.


  • Anti-Static Device
  • Anti-Blow out Stem

Valve Size :

NPS 1/2~NPS 36

Pressure Class:

150#, 300#, 600#, 900#, 1500#, 2500#


Carbon Steel, Stainless Steel

Low-Temperature Carbon Steel,

Duplex, Super Duplex, Inconel

Design and Manufacturing Standards :


ASME B 16.34

BS EN ISO 17292

Face to Face Standards:

ASME B 16.10, API 6D

Flange Dimension Standards:

ASME B 16.5 (up to 24″)

ASME B16.47 Series A (26″ and above)

Butt Weld Valve End Standards:

ASME B16.25

Pressure Test Standards:


API 598

BS EN 12266 -1 and 2

Fire Safety Test Standards:

API 607


BS EN ISO 10497

Fugitive Emissions:

ISO 15848


MR 01-75 / ISO 15156 compliant

Valve operator options:

Bare stem, Gear, Hand lever

Pneumatic actuator,

Hydraulic actuator, Gas actuator

Gas-over-oil actuator

Motor-operated actuator

Hydraulic/electro actuator

hydraulic-operated actuator

Metal Seated Ball Valve Selection Guide

SIO metal seated ball valve is a type of ball valve with metal seats designed for critical applications. Our metal seated valve is generally used for isolation, but many are now being used for uni- and bi-directional controls.

The main advantage of a metal seated valve against a soft seated ball valve is its ability to withstand critical applications. The metal seats can endure high temperatures exceeding 1,000° F, hydraulic shock, extreme flashing, and abrasive process fluid. They are also suitable for high-erosion and corrosion services. They are widely used in the oil and gas industries, power generation, petrochemicals, mining, and pulp and paper industries.

Metal seated ball valve

Another advantage of a metal seated ball valve is it can be tougher through special coatings. The application of these coatings will make the seat rings and ball hard-faced on sealing areas. Excellent examples of special coatings include tungsten carbide, chromium carbide, hard facing, and electrolysis nickel plating.

A significant difference between soft seated valves and metal seated valves is the material used for the seats. Soft seated valves are usually made from thermoplastic materials like PTFE, while metal seat designs are made from durable metal like stainless steel and carbon steel.

Soft seated valves are suitable for applications where chemical compatibility and tight sealing are crucial. Meanwhile, metal seated valves are capable of maintaining a tight shutoff even in extreme conditions.

Even though it costs more than a soft seated valve, the efficiency, safety, and longevity of a metal seated ball valve will pay off. Therefore, it is the best and economical option for crucial applications.

Metal Seated Ball Valve Design Features & Options

Full and Reduced Bore

SIO offers both full and reduced bore designs for metal seated ball valves. A full bore means having the same internal diameter as the pipe with a consistent flow rate and minimum pressure drop and cavitation. Full bore valves are ideal in applications where pressure drop and low flow resistance are significant. They are also suitable in media that contain mixed solids and liquids to avoid material buildups that might affect the flow in the pipes.

A reduced bore means the flow passage of the valve is a pipe size smaller than the pipe size of the valve. Reduced bore valves have straight flow passages and create flow restrictions which can lead to a pressure drop. They are commonly used in applications where flow turbulence, material characteristics, and pressure drop are not a concern.

Fire-safe Design

A. Internal Leakage

The metal seats of SIO’s ball valves are extremely resistant to heat and help ensure in managing internal leakage. When the primary o-ring gets damaged during an accidental fire, the spring-loaded metal seats will come into contact with the ball to block fluid passage. This mechanism will control internal leakage and prevent further damage.

B. External Leakage

Our metal seated ball valves have an external leakage prevention feature that further protects the fluid in line from leaking. In case the o-rings are damaged by fire or other accidents, the secondary graphite will block potential external leakage in the valves.

Antistatic Device

With the antistatic device, the chances of accidental fires are greatly reduced. Anti-static spring-loaded balls are attached in the metal seated valve for consistent electrical conductivity among metal components. The antistatic device also minimizes static charge as a cause of frequent friction. This protects the valve from sparks that could start a fire if the medium in line is flammable.

Anti-blowout Stem

With the metal seated ball valve design, the anti-blowout stem is separated from the valve body to prevent it from bursting when there is too much pressure on the ball seats. The stem housing, which is connected to the body, keeps the stem in place even when the valve is receiving excessive pressure. This system can greatly improve the overall performance of the ball valve.

Extreme temperature Services

SIO metal seated valves are suitable in applications with harsh temperatures thanks to their High-Velocity Oxygen Fuel (HVOF) coating. Chromium carbide coating allows our valves to withstand high temperatures up to 1,500° F and enhances their durability and lifespan. Meanwhile, tungsten carbide coating allows our ball valves to continually provide a tight shutoff even in temperatures below 302° F.

How Does a Metal Seated Ball Valve Work

SIO metal seated ball valves combine a metal-to-metal seal between the ball and seats of the valve assembly. This gives them the ability to withstand corrosives, abrasives, and high-pressure/ high-temperature applications. They are compliant with ANSI Class IV leakage standards, which only permits less than 0.01% leakage of the valve’s full open capacity.

The seat design of our metal seated ball valve can either be floating or trunnion mounted. SIO floating metal seated ball valves provide effective bi-directional sealing and cavity relief. The precise connection between the spring-loaded seat rings increases the sealing capacity over high pressures. They also produce a mechanical cavity relief to the pressurized side of the ball valve for both flow directions.

The spring-loaded seats located in the valve body ensures tight sealing and low operational torques in high- or low-pressure applications. In case of a rapid buildup of pressure in the cavity, the spring-loaded seats will relieve the excess pressure to the pressurized side of the valve.

SIO trunnion mounted metal seated ball valve is equipped with a double block and bleed (DBB) mechanism. It consists of two independent seat rings that provide bi-directional sealing of the valve against a range of different pressures.

Applications for Metal Seated Ball Valve

Oil & Gas Industries

SIO metal seated ball valve is mainly designed to meet the crucial service needs of the upstream and midstream lines in the oil & gas industries. These industries require reliable tight sealing with 0% chances of leaking. Our valves are designed to only allow less than 0.01% leakage in their full open capacity.


Critical operating conditions, crucial safety operations, and corrosive acids – these are all present in petrochemical processing plants. The premium performance and surface hardness of SIO’s metal seated ball valves for high temperature will ensure the integrity and safety of the entire operation.

Mining Industry

Mining industries have severe processing environments that can cause serious damage to valves. As a reliable metal seated ball valve manufacturer, SIO’s metal seated ball valves are designed for such conditions. They are abrasion-resistant and have special coatings for more durability. They are built to function and isolate in harsh applications, such as vent gas lines, slurry pump isolation, and acid injection.

Pulp and Paper Industry

The pulp and paper industry requires zero-leak isolation and deals with crucial applications and dangerous substances. Our metal seated valves not only provide reliable isolation but also contain special HVOF coating. This enhances their wear, corrosion, and erosion resistance, increasing their service life.

Power Generation

SIO metal seated ball valves provide a reliable, economical, and long-term solution for critical applications in power generation plants. Their HVOF coating enhances their surface hardness of 70+ HRC, bond strengths up to 25,000 PSI, and temperatures as high as 1,500° F. With their durability, these SIO ball valves are ideal for demanding applications in power industries with less repair and maintenance needs.

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