Side-mounted eccentric half-ball valve

Product Use

The PQ47 eccentric half-ball valve utilizes an eccentric valve body, an eccentric ball, and a valve seat. As the valve stem rotates, the ball automatically centers itself along a common trajectory, ensuring tighter closure as the valve is shut, thereby achieving excellent sealing performance. During operation, the ball and valve seat completely disengage, eliminating wear on the sealing ring and overcoming the persistent issue of wear between the traditional ball and seat sealing surfaces. A non-metallic elastic material is embedded within the metal seat, providing superior protection for the metal surface of the seat. This product is particularly well-suited for media such as those found in the steel industry, aluminum industry, fiber processing, fine solid particles, pulp, coal ash, and petroleum gas.

Product Features

·Its structure employs the eccentric wedge-tightening principle, using a transmission mechanism to achieve clamping, adjustment, and closure. The sealing pair features hard-metal ring seals with metal-to-metal contact. The double-eccentric design ensures that, during opening, the valve core is housed within the ball-retaining chamber, providing a large flow passage and preventing the valve from being eroded. During closing, the valve core itself remains free from erosion. As the valve opens, the spherical surface of the valve core gradually engages with the valve seat, effectively removing scale buildup and ensuring reliable sealing. This design is particularly effective for handling two-phase mixtures prone to scaling and solid precipitation.

·The valve’s hemisphere is made of bimetal, with different alloys welded onto the base material. The valve seat is also correspondingly alloy-welded and undergoes special treatment. The sealing surfaces are assembled into various types—such as corrosion-resistant, wear-resistant, and high-strength—to meet the requirements of different applications.

● Highly sealed, enabling zero leakage even when conveying hazardous gases.

·The valve core of the sealing pair is designed with a compensation allowance. Even after the valve seat wears down, a slight additional rotation during closure will still ensure reliable sealing, thereby extending the service life. Moreover, if the user loosens the compression nut, adjusts or replaces the valve seat, the seat can still be reused, thus avoiding the drawback of having to discard the entire valve when its seal fails.

The selection and matching of bimetallic sealing pairs made from different alloys (or combined balls) for surfacing welding can be used in service conditions that demand wear resistance, corrosion resistance, high-temperature resistance, and stringent sealing performance.

· Universal valve: Available in sizes ranging from DN40 to 1600 mm. Suitable for applications with stringent requirements, such as wastewater treatment, pulp processing, and urban heating systems.

· Specialized flange for oil and chemical industries: Specifications range from DN40 to 1600 mm. Suitable for various types of oils such as crude oil and heavy oil, as well as weakly corrosive two-phase mixed media commonly found in the chemical industry.

· Gas-specific valve: Available in sizes from DN40 to 1600 mm. Suitable for the control of gas, natural gas, and liquefied petroleum gas transmission.

· Slurry-specific valve: Available in sizes ranging from DN40 to 1600 mm. Suitable for industrial pipeline applications involving two-phase flow of liquid and solid, or for liquid transport where chemical reactions result in crystal precipitation or scaling.

· Special valve for coal ash and slag: Specifications range from DN40 to 1600 mm. Suitable for controlling pipelines in power plants, hydraulic slag removal systems, or gas-phase conveying systems.

Implementation standard

Design standard: GB/T26146

Flange connections: GB/T17241.6, GB/T9124 (steel)

Structural length: GB/T26146, GB/T12221

Main component materials

Product Use

The PQ47 eccentric half-ball valve utilizes an eccentric valve body, an eccentric ball, and a valve seat. As the valve stem rotates, the ball automatically centers itself along a common trajectory, ensuring tighter closure as the valve is shut, thereby achieving excellent sealing performance. During operation, the ball and valve seat completely disengage, eliminating wear on the sealing ring and overcoming the persistent issue of wear between the traditional ball and seat sealing surfaces. A non-metallic elastic material is embedded within the metal seat, providing superior protection for the metal surface of the seat. This product is particularly well-suited for media such as those found in the steel industry, aluminum industry, fiber processing, fine solid particles, pulp, coal ash, and petroleum gas.

Product Features

·Its structure employs the eccentric wedge-tightening principle, using a transmission mechanism to achieve clamping, adjustment, and closure. The sealing pair features hard-metal ring seals with metal-to-metal contact. The double-eccentric design ensures that, during opening, the valve core is housed within the ball-retaining chamber, providing a large flow passage and preventing the valve from being eroded. During closing, the valve core itself remains free from erosion. As the valve opens, the spherical surface of the valve core gradually engages with the valve seat, effectively removing scale buildup and ensuring reliable sealing. This design is particularly effective for handling two-phase mixtures prone to scaling and solid precipitation.

·The valve’s hemisphere is made of bimetal, with different alloys welded onto the base material. The valve seat is also correspondingly alloy-welded and undergoes special treatment. The sealing surfaces are assembled into various types—such as corrosion-resistant, wear-resistant, and high-strength—to meet the requirements of different applications.

● Highly sealed, enabling zero leakage even when conveying hazardous gases.

·The valve core of the sealing pair is designed with a compensation allowance. Even after the valve seat wears down, a slight additional rotation during closure will still ensure reliable sealing, thereby extending the service life. Moreover, if the user loosens the compression nut, adjusts or replaces the valve seat, the seat can still be reused, thus avoiding the drawback of having to discard the entire valve when its seal fails.

The selection and matching of bimetallic sealing pairs made from different alloys (or combined balls) for surfacing welding can be used in service conditions that demand wear resistance, corrosion resistance, high-temperature resistance, and stringent sealing performance.

· Universal valve: Available in sizes ranging from DN40 to 1600 mm. Suitable for applications with stringent requirements, such as wastewater treatment, pulp processing, and urban heating systems.

· Specialized flange for oil and chemical industries: Specifications range from DN40 to 1600 mm. Suitable for various types of oils such as crude oil and heavy oil, as well as weakly corrosive two-phase mixed media commonly found in the chemical industry.

· Gas-specific valve: Available in sizes from DN40 to 1600 mm. Suitable for the control of gas, natural gas, and liquefied petroleum gas transmission.

· Slurry-specific valve: Available in sizes ranging from DN40 to 1600 mm. Suitable for industrial pipeline applications involving two-phase flow of liquid and solid, or for liquid transport where chemical reactions result in crystal precipitation or scaling.

· Special valve for coal ash and slag: Specifications range from DN40 to 1600 mm. Suitable for controlling pipelines in power plants, hydraulic slag removal systems, or gas-phase conveying systems.

Main component materials

Main performance parameters

PQ47/347/947H/Y-10C(WCB/304/316)

PQ47/347/947H/Y-16C(WCB/304/316)