PQ640F Πνευματική έκκεντρη σφαιρική βαλβίδα API6D & API607
Μοντέλο βαλβίδας: PQ640F, PQ640H
Ονομαστική Διάμετρος: DN25～DN300
Δομή: Eccentric Rotating Ball Core
Υλικό σώματος βαλβίδας: Ανθρακούχο Χάλυβας WCB, Ανοξείδωτο ατσάλι 304, Ανοξείδωτο ατσάλι 316
Ονομαστική πίεση: ΠΝ10, ΠΝ16, ΠΝ25, ΠΝ40
Εφαρμόσιμη θερμοκρασία: -20℃~450℃
Applications: Ατμός, νερό, έλαιο, αέριο, corrosive media
Features: High performance, μεγάλη διάρκεια ζωής, 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. Κατά το άνοιγμα και το κλείσιμο, 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. Στο μεταλλικό κάθισμα είναι ενσωματωμένο μη μεταλλικό ελαστικό υλικό, παρέχοντας εξαιρετική προστασία για τη μεταλλική επιφάνεια της έδρας της βαλβίδας.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (twigs, textile bags, και τα λοιπά.) in the medium when closed, ensuring normal valve opening and closing.
3. The valve hemisphere is made of bimetal, με διαφορετικά κράματα συγκολλημένα στο υλικό βάσης. Η έδρα της βαλβίδας είναι επίσης συγκολλημένη ανάλογα και έχει ειδική επεξεργασία. The sealing surfaces are combined to form various types such as corrosion-resistant, ανθεκτικό στη φθορά, και υψηλής αντοχής, 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, χημική ουσία, χαρτοποιία, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Ονομαστική Διάμετρος: DN25～DN300 (ΜΜ)
Ονομαστική πίεση: PN1.0, 1.6, 2.5, 6.4MPa
Τύπος σύνδεσης: Τύπος γκοφρέτας, Σύνδεση με φλάντζα
Τύπος δομής: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Υλικό σώματος βαλβίδας: Ανθρακούχο ατσάλι WCB, Ανοξείδωτο ατσάλι 304, Ανοξείδωτο ατσάλι 316, 316μεγάλο
Ποσοστό διαρροής 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)
Χαρακτηριστικά ροής: Περίπου ίσο ποσοστό
Μέθοδος Ελέγχου: Τύπος ενεργοποίησης/απενεργοποίησης (two-position switch), ρυθμιστικός τύπος (positioner 4-20mA analog signal)
Actuation Type: Single-acting (ανοιξιάτικη επιστροφή) 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. Όταν είναι πλήρως ανοιχτό, 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.
