PQ640F Pnömatik Eksantrik Küresel Vana API6D & API607
Valve Model: PQ640F, PQ640H
Nominal Çap: DN25～DN300
Yapı: Eccentric Rotating Ball Core
Valf Gövde Malzemesi: Karbon Çelik WCB, Paslanmaz çelik 304, Paslanmaz çelik 316
Nominal Basınç: PN10, PN16, PN25, PN40
Uygulanabilir Sıcaklık: -20℃～450℃
Applications: Buhar, su, yağ, gaz, corrosive media
Features: High performance, uzun servis ömrü, 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. Açılış ve kapanış sırasında, 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, Sızdırmazlık halkasındaki aşınmanın ortadan kaldırılması ve geleneksel küresel vanalarda sızdırmazlık yüzeyi ile bilya arasındaki sürekli aşınma sorununun aşılması. Metal koltuğa metalik olmayan elastik malzeme yerleştirilmiştir, valf yuvasının metal yüzeyi için mükemmel koruma sağlar.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (twigs, textile bags, vesaire.) 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, kimyasal, kağıt yapımı, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Nominal Çap: DN25～DN300 (MM)
Nominal Basınç: PN1.0, 1.6, 2.5, 6.4MPa
Bağlantı Türü: Gofret türü, Flanş bağlantısı
Yapı Tipi: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Valf Gövde Malzemesi: Carbon steel WCB, Stainless steel 304, Stainless steel 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)
Akış Özellikleri: Approximately equal percentage
Kontrol Yöntemi: 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. Tamamen açıldığında, 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.
