Válvula de esfera excêntrica pneumática PQ640F API6D & API607
Valve Model: PQ640F, PQ640H
Diâmetro Nominal: DN25～DN300
Estrutura: Eccentric Rotating Ball Core
Material do corpo da válvula: WCB em aço carbono, Aço inoxidável 304, Aço inoxidável 316
Pressão Nominal: PN10, PN16, PN25, PN40
Temperatura aplicável: -20℃～450℃
Applications: Steam, água, óleo, gás, corrosive media
Features: High performance, long service life, 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 a abertura e fechamento, 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 o desgaste no anel de vedação e superando o problema de desgaste constante entre a superfície de vedação e a esfera nas válvulas de esfera tradicionais. Material elástico não metálico está embutido no assento de metal, proporcionando excelente proteção para a superfície metálica da sede da válvula.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (galhos, sacos têxteis, etc.) no meio quando fechado, 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, fabricação de papel, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Diâmetro Nominal: DN25～DN300 (MM)
Pressão Nominal: PN1.0, 1.6, 2.5, 6.4MPa
Connection Type: Wafer type, Conexão de flange
Tipo de estrutura: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Material do corpo da válvula: Carbon steel WCB, Stainless steel 304, Stainless steel 316, 316eu
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
Control Method: On/off type (two-position switch), regulating type (positioner 4-20mA analog signal)
Actuation Type: Single-acting (retorno na primavera) 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. Quando totalmente aberto, 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. During valve opening and closing, 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.
