BALL VALVES
0102030405
METAL SEATED BALL VALVE MANUFACTURER
Design Standards and Construction
This ball valve is manufactured in compliance with relevant DIN standards such as EN 12516 for pressure-temperature ratings, EN 1092-1 for flange dimensions, and EN 558 for face-to-face dimensions. The valve design ensures full compatibility with European piping systems and provides consistent dimensional accuracy and mechanical integrity.
The valve body is typically of split-body or three-piece construction, fabricated from high-quality cast steel materials such as GS-C25, ASTM A216 WCB (DIN equivalent), or alloy steels depending on service requirements. Cast steel construction provides excellent mechanical strength, impact resistance, and pressure containment, making the valve suitable for large diameter pipelines and high-pressure classes.
Trunnion Mounted Ball Design
A key feature of this valve is its trunnion mounted ball configuration. Unlike floating ball valves, the ball in a trunnion mounted design is supported by upper and lower trunnions, which absorb the line pressure forces. This significantly reduces operating torque, especially in high-pressure and large-size applications.
The trunnion mounted ball ensures precise alignment and stable operation, minimizing wear on the seats and stem. It also allows the use of spring-loaded or pressure-assisted seats that maintain tight sealing performance under both low and high pressure conditions.
Metal Seated Ball and Seats
The valve is equipped with metal-to-metal seating, typically utilizing hardfaced materials such as stainless steel with chromium carbide, tungsten carbide, or Stellite overlays. Metal seated ball valves are specifically designed for severe service conditions involving high temperatures, abrasive media, corrosive fluids, or flashing services where soft-seated valves may fail.
The metal seats are precision-machined and lapped to achieve reliable shut-off performance, even under extreme operating conditions. This design offers excellent resistance to erosion, thermal shock, and particulate damage, making it suitable for applications such as steam, hot oil, slurry, and process gases.
Flange End Connections
The valve features flanged end connections in accordance with DIN EN 1092-1, with pressure ratings typically ranging from PN16 to PN100 or higher depending on valve size and material. Flanged ends provide secure and leak-tight installation, ease of maintenance, and compatibility with standard DIN piping systems.
The flange faces are usually raised face (RF) or flat face (FF), with precision machining to ensure proper gasket seating and long-term sealing integrity.
Worm Gear Manual Actuation
Manual operation is achieved through a worm gear actuator mounted on the valve stem. The worm gear mechanism significantly reduces the operating torque required to open or close the valve, allowing smooth and controlled operation even for large diameter and high-pressure valves.
The gear operator is typically enclosed in a robust, weatherproof housing made of ductile iron or cast steel, providing protection against dust, moisture, and mechanical damage. The gearbox is permanently lubricated and designed for long service life with minimal maintenance.
A handwheel or hand crank is used to operate the valve, and clear open/close position indicators are provided for easy visual confirmation of valve status. Locking devices or travel stops may be included to prevent unauthorized operation and ensure precise positioning.
Stem, Sealing, and Fire-Safe Design
The valve stem is made from high-strength stainless steel and designed as an anti-blowout type, ensuring safety under internal pressure. Multiple stem sealing arrangements, such as graphite packing with live-loaded springs, are used to provide reliable sealing and low fugitive emissions.
Metal seated trunnion mounted ball valves are often designed to be fire-safe in accordance with EN ISO 10497 or API 607, ensuring continued sealing performance in the event of external fire exposure. Secondary metal seals engage automatically if soft sealing elements are damaged, preventing catastrophic leakage.
Pressure Relief and Body Cavity Protection
To prevent overpressure in the body cavity, especially in double block and bleed configurations, the valve may incorporate automatic pressure relief through the seats or a dedicated cavity relief valve. This feature enhances operational safety when the valve is in the closed position and subjected to temperature fluctuations.
Applications and Performance
The DIN standard worm gear operated trunnion mounted metal seated ball valve is ideally suited for on/off isolation service where zero leakage, high reliability, and resistance to harsh conditions are required. Typical applications include high-pressure steam lines, hydrocarbon processing units, gas transmission pipelines, power plant auxiliaries, and abrasive process services.
Its robust cast steel body, low-torque trunnion design, and durable metal seating system ensure consistent performance, extended service life, and reduced maintenance costs, even under the most demanding operating environments.