Robinet à bille excentrique pneumatique PQ640F API6D & API607
Modèle de vanne: PQ640F, PQ640H
Diamètre nominal: DN25～DN300
Structure: Eccentric Rotating Ball Core
Matériau du corps de vanne: WCB en acier au carbone, Acier inoxydable 304, Acier inoxydable 316
Pression nominale: PN10, PN16, PN25, PN40
Température Applicable: -20℃ ~ 450 ℃
Applications: Steam, eau, huile, gaz, corrosive media
Features: High performance, longue durée de vie, 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. During opening and closing, 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, eliminating wear on the sealing ring and overcoming the problem of constant wear between the sealing surface and the ball in traditional ball valves. Un matériau élastique non métallique est intégré dans le siège métallique, offrant une excellente protection à la surface métallique du siège de soupape.
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, avec différents alliages soudés sur le matériau de base. Le siège de soupape est également soudé en conséquence et spécialement traité. The sealing surfaces are combined to form various types such as corrosion-resistant, résistant à l'usure, et haute résistance, 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, chimique, fabrication du papier, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Diamètre nominal: DN25～DN300 (MM)
Pression nominale: PN1.0, 1.6, 2.5, 6.4MPa
Type de connexion: Type de plaquette, Connexion à bride
Type de structure: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Matériau du corps de vanne: WCB en acier au carbone, Acier inoxydable 304, Acier inoxydable 316, 316L
Taux de fuite 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)
Caractéristiques du débit: Pourcentage à peu près égal
Méthode de contrôle: Type marche/arrêt (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. When fully open, 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.
