Válvula de bola excéntrica neumática PQ640F API6D & API607
Valve Model: PQ640F, PQ640H
Diámetro nominal: DN25～DN300
Estructura: Eccentric Rotating Ball Core
Material del cuerpo de la válvula: WCB de acero al carbono, Acero inoxidable 304, Acero inoxidable 316
Presión nominal: PN10, PN16, PN25, PN40
Temperatura aplicable: -20℃～450℃
Applications: Vapor, agua, aceite, gas, corrosive media
Features: High performance, larga vida útil, low opening and closing torque, V-shaped notch with cutting function
Introduction to PQ640F Pneumatic Eccentric Ball Valve API6D & API607:
The PQ640H pneumatic eccentric ball valve features frictionless opening and closing, wear-resistant seals, and low opening and closing torque. It controls the pipeline medium by rotating a hemisphere around an eccentric axis. Durante la apertura y el cierre, no friction occurs between the ball and the valve seat sealing surface, reducing wear on the seals and significantly extending service life. Because the structural principle of the pneumatic eccentric ball valve is very similar to the operation of a triple eccentric butterfly valve, some people refer to the eccentric ball valve as a butterfly valve with a spherical valve disc.
Features of PQ640F Pneumatic Eccentric Ball Valve API6D & API607:
1. The ball and seat of the PQ640H pneumatic eccentric ball valve are completely separated, Eliminando el desgaste del anillo de sellado y superando el problema del desgaste constante entre la superficie de sellado y la bola en las válvulas de bola tradicionales.. El material elástico no metálico está incrustado en el asiento metálico., proporcionando una excelente protección para la superficie metálica del asiento de la válvula.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (twigs, textile bags, etc.) in the medium when closed, ensuring normal valve opening and closing.
3. The valve hemisphere is made of bimetal, with different alloys welded onto the base material. The valve seat is also welded accordingly and specially treated. The sealing surfaces are combined to form various types such as corrosion-resistant, wear-resistant, and high-strength, meeting the needs of different applications.
4. The pneumatic eccentric rotary valve is particularly suitable for slurry and media containing fibers, as well as media containing small suspended solids. It is widely used in pipelines in petroleum, químico, fabricación de papel, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Diámetro nominal: DN25～DN300 (MM)
Presión nominal: PN1.0, 1.6, 2.5, 6.4MPa
Tipo de conexión: Wafer type, Conexión de brida
Tipo de estructura: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Material del cuerpo de la válvula: Carbon steel WCB, Acero inoxidable 304, Acero inoxidable 316, 316l
Leakage Rate Q: Soft seal VI class, Hard seal IV class
Adjustable Range: Full cavity type (100:1), 60% cavity type (60:1), 40% cavity type (40:1)
Flow Characteristics: Approximately equal percentage
Método de control: On/off type (two-position switch), regulating type (positioner 4-20mA analog signal)
Actuation Type: Single-acting (spring return) normally open, normally closed; Double-acting (no return) air-on/air-off
Pneumatic Eccentric Ball Valve Principle Explanation
The pneumatic eccentric ball valve features an offset dimension between the centerline of the hemisphere and the centerline of the valve stem, and between the hemisphere and the centerline of the valve seat. Cuando está completamente abierto, the ball is completely disengaged from the valve seat with a certain gap. The rotation radius has two parts: a long radius and a short radius. The tangent to the long radius rotation trajectory forms an angle θ with the valve seat sealing surface. Durante la apertura y cierre de la válvula, the hemisphere gradually disengages from and gradually compresses against the valve seat surface, thus reducing mechanical wear and scratches between the valve seat and the hemisphere during opening and closing, and improving service life.
