Van bi lệch tâm khí nén PQ640F API6D & API607
Valve Model: PQ640F, PQ640H
Đường kính danh nghĩa: DN25～DN300
Structure: Eccentric Rotating Ball Core
Vật liệu thân van: Carbon Steel WCB, thép không gỉ 304, thép không gỉ 316
Áp suất danh nghĩa: PN10, PN16, PN25, PN40
Nhiệt độ áp dụng: -20℃～450℃
Applications: Steam, Nước, dầu, khí đốt, 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. 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. Non-metallic elastic material is embedded in the metal seat, providing excellent protection for the metal surface of the valve seat.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (twigs, textile bags, vân vân.) 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, hóa chất, papermaking, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
Đường kính danh nghĩa: DN25～DN300 (MM)
Áp suất danh nghĩa: PN1.0, 1.6, 2.5, 6.4MPa
Kiểu kết nối: Wafer type, Flange connection
Loại cấu trúc: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
Vật liệu thân van: 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)
Flow Characteristics: Approximately equal percentage
Control Method: 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. 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.
