Top-mounted Eccentric Semi-ball Valve

Product details:

The top-mounted eccentric semi-ball valve uses an eccentric valve body, an eccentric ball and a valve seat. When the valve stem rotates, it automatically centers on the same trajectory. During the closing process, it closes tighter and tighter, completely achieving good sealing purposes. The ball and seat of the valve are completely separated, eliminating the wear of the sealing ring and overcoming the problem of constant wear of the traditional ball seat and ball sealing surface.

The non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected. This product is especially suitable for steel industry, aluminum industry, fiber, tiny solid particles, pulp, coal ash, petroleum gas and other media.

The features of top-mounted eccentric semi-ball valve:

1. Its structure adopts the eccentric tightening principle to achieve the purpose of gate tightening, adjustment and closing through the transmission mechanism. The sealing pair is a metal surface ring with a hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the ball chamber, and the flow cross-section is large. , and the valve will not be washed, the valve core will not be washed when closed, and the spherical surface of the valve core will gradually move along the valve seat when opened, effectively removing scaling obstacles and achieving reliable sealing. It is particularly effective for mixed flow transportation of two-phase mixed flow where solids that are prone to scaling are precipitated.

2. The hemisphere of the valve is made of bimetal, and different alloys are overlayed on the base metal. The valve seat is also overlayed accordingly and undergoes special treatment. The sealing surface is combined into various types such as anti-corrosion, wear-resistant, and high-strength to meet the needs of different occasions.

3. It is tightly sealed and can transport harmful gases with zero leakage.

4. There is a compensation amount left in the valve core of the sealing pair. When the valve is worn, rotate it a little when closing to ensure reliable sealing and extend the service life. In addition, the user can unscrew the compression nut and the valve seat can still be used after adjustment or replacement, thus avoiding the disadvantage of scrapping the entire unit after the valve seal fails.

5. The structure of the top-mounted eccentric semi-ball valve has a cover on it, which can be repaired on the pipeline, which is convenient and labor-saving.

Water Treatment Expansion Project, Morocco

In 2025, a major water treatment expansion project was launched in Oued Zem, Morocco, to improve regional water quality and ensure stable potable water supply for local communities and industries. The project was commissioned by a consortium of Moroccan municipal water authorities and regional infrastructure developers, with the participation of local trade partners to source high-quality pipeline equipment.

As part of the procurement scope, DN1400 top-mounted eccentric semi-ball valves were selected and supplied through our trusted Moroccan trade partner to meet stringent performance and durability requirements in large-diameter water transmission and treatment pipelines. The resilient design and reliable operation of these valves supported system commissioning and ongoing maintenance needs.

Why This Valve Was Selected:

Reliable Sealing with Dirty Media:

The eccentric semi-ball design provides a scraping action during operation, significantly reducing seat wear and maintaining tight shut-off even when solids are present — a common condition in Morocco’s seasonal river water sources.

Top-mounted Maintenance Accessibility:

Local operations teams can access internal components from above the pipeline without removing the valve body, minimizing downtime and labor costs during scheduled maintenance.

Durability in Harsh Operating Conditions:

The valve’s robust construction and corrosion-resistant materials ensure long-term performance under variable temperatures and water quality conditions typical in North African environments.

Main Products:

>DN1400 Top-mounted Eccentric Semi-ball Valve

>Ductile Iron Wafer Butterfly Valve

>Double plate check valve

Due to the surfacing of different alloys (or combination balls), the optional bimetal seal pair can be used in working conditions that are wear-resistant, corrosion-resistant, high-temperature resistant and require strict sealing.

1. General valve: Specification model DN40-1600.

Suitable for occasions with strict requirements such as sewage treatment, paper pulp, and urban heating;

2. Special valves for oil and chemical industry: specifications DN40-1600.

Suitable for weakly corrosive and two-phase mixed flow media in various oil products such as crude oil and heavy oil, as well as in the chemical industry;

3. Special gas valve: specification DN40-1600.

Suitable for transportation control of coal gas, natural gas and liquefied gas;

4. Special valve for slurry: specification DN40-1600.

It is suitable for industrial pipeline transportation where liquid and solid two-phase mixed flow or chemical reactions in liquid transportation may cause crystallization or scaling;

5. Special valve for coal fly ash slag: specification DN40-1600.

It is suitable for the control of power plants, hydraulic slag removal or gas transportation pipelines.