Metal Seated Ball Valves - SIO
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Metal Seated Ball Valves


  • 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.

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.

Metal Seated Ball Valve factory

Metal Seated Ball Valves have metal-to-metal seals between the ball and the seat. They are made for use in harsh conditions of corrosive materials, high temperatures, or high pressures. Metal Seated Ball Valves usually serve as isolation devices, but many are also used as uni- or bi-directional control valves because they offer tight shutoff under severe conditions.

Look no further than SIO if you are searching for an international supplier of metal seated ball valves. Located in China, our manufacturing facility offers a range of steam valve types through five-step quality control procedures, produces high-precision parts, conducts regular testing, and uses ultrasonic cleaning.

As a reliable metal seated ball valve manufacturer, material control and traceability are of high priority in SIO’s factory. Material is inspected before machining, and any elements that do not meet our standards are returned to their original supplier.

Metal Seated Ball Valve

Metal Seated Ball Valve Design
& Features Options

There are many types of ball valves, 3-way ball valve, DBB ball valve, floating ball valve, trunnion ball valve, and others. Each one has different designs and features.

Full and Reduced Bore

SIO offers metal seated ball valves with both full and reduced bores. A full bore ball valve is the best option in applications that require a low-pressure drop and low flow resistance. When flow turbulence, material properties, and pressure drop are not of concern, a reduced bore valve is used.

Fire-safe Design

Ball valve seats from SIO are extremely heat-resistant and are designed to manage ball valve internal leakage.

The metal seated ball valves we offer are equipped with an external leakage prevention feature to ensure that no fluid in the line leaks.

Antistatic Device

Antistatic devices greatly reduce the chances of fire accidents. The antistatic device also reduces static charge, a frequent cause of friction. As a result, if the medium in the line is flammable, sparks from the valve will not start a fire.

Anti-blowout Stem

The metal seated ball valve design has a separate anti-blowout stem, which prevents the ball seats from bursting when too much pressure is applied. Even if the valve is receiving excessive pressure, the stem housing holds the stem in place.

Extreme temperature Services

The High-Velocity Oxygen Fuel (HVOF) coating on SIO metal seated valves makes them suitable for applications at harsh temperatures. Chromium carbide coating allows our valves to withstand high temperatures up to 1,500° F and tungsten carbide coating provides a tight shutoff even in temperatures below 302° F.

Metal Seated Ball Valves Features

Temperature range

SIO metal seated ball valves can withstand high temperatures up to 1500°F and also below 302°F.

Anti-blowout Stem

SIO valves have an anti-blowout stem that prevents the ball valve from bursting in high temperature conditions.

Pressure class

SIO metal seated ball valves belong to pressure classes- 150#, 300#, 600#, 900#, 1500#, 2500#.


SIO valves are made from durable materials such as Carbon Steel, Stainless Steel, etc. These materials ensure that the ball valves work efficiently in extreme environments, like pipelines and energy generation applications.

Benefits of using Metal Seated Ball Valves

Ball valve types are diverse, metal seated ball valve working principle makes it outstanding from other valve types,  below are some metal seated ball valves benefits.

Extreme tolerance capacity

Metal seated ball valves are generally used in severe conditions. These can tolerate extremely high temperatures, more than 1000°F. They can endure severe flashing as well as hydraulic shock.


Metal seated ball valves have the advantage of not being damaged by abrasive fluids. These valves are known for their durability and corrosion resistance. They can control the flow of high-reactive fluids, chemicals, and gases.


Despite the higher cost of metal-seated valves, the downtime costs resulting from a failure, coupled with the cost of replacing a soft-seated valve, need to be considered. A metal seated ball valve's efficiency and longevity outweigh its higher price.

Standard and specification of Metal Seated Ball Valves

Design and Manufacturing Standards

SIO metal seated ball valve complies with API 6D, ASME B 16.34, BS EN ISO 17292 design and manufacturing standards.

Face to Face and Flange Dimension Standards

These SIO valves have ASME B 16.10 and API 6D face to face standards. They comply with ASME B 16.5, ASME B16.47 Series A dimension standards.

Pressure Test Standards

Pressure test standards are extremely important in metal seated valves and SIO valves comply with API 6D, API 598, and BS EN 12266 -1 and 2 standards.

Fire Safety Test Standards

SIO metal seated ball valves comply with API 607, API 6FA, BS EN ISO 10497 fire safety standards that make them suitable for industrial uses.

Applications for Metal Seated Ball Valve

Oil and Gas Industries

In the oil and gas industry, SIO metal seated ball valves are mainly used for upstream and midstream service needs. In these industries, reliable tight sealing is essential with no leakage risk. In their full open capacity our valves have a leakage rate of less than 0.01%. Trunnion ball valves and block and bleed ball valves and used in oil and gas industries.

Petrochemical Industries

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 metal seated ball valves for high temperature will ensure the integrity and safety of the entire operation. API ball valve is used for this application.

Mining Industry

Mining industries have severe processing environments that can cause serious damage to valves. As a metal seated ball valve manufacturer, SIO metal seated ball valves are designed for such conditions. They are abrasion-resistant and have special coatings for more durability. Reduced bore ball valve and flange ball valve are built to function and isolate in harsh applications

Pulp and Paper Industry

There are crucial applications and dangerous substances in the pulp and paper industry, which requires zero-leak isolation. Our metal seated valves feature a special HVOF coating that provides reliable isolation. As a result, they are more resistant to wear, corrosion, and erosion, which increases 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. The High pressure ball valve is generally used in power generation plants.

As a professional industrial valve manufacturer, SIO also provides articles, if you want to know “How 3-way ball valve works“,  “globe valve vs ball valve“, some info about “Trunnion mounted ball valve working principle“, “Ball valve vs gate valve“, you could find the answer in our Blog part.

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