PQ640F 空気式偏心ボールバルブ API6D & API607
バルブ型式: PQ640F, PQ640H
呼び径: DN25～DN300
構造: Eccentric Rotating Ball Core
バルブボディ材質: 炭素鋼 WCB, ステンレス鋼 304, ステンレス鋼 316
呼び圧力: PN10, PN16, PN25, PN40
適用温度: -20℃～450℃
Applications: スチーム, 水, 油, ガス, corrosive media
Features: High performance, 長寿命, 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. 開閉時, 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, シールリングの摩耗を排除し、従来のボールバルブのシール面とボールの間の絶え間ない摩耗の問題を克服します。. 非金属弾性材料が金属シートに埋め込まれています, バルブシートの金属表面に優れた保護を提供します。.
2. The V-shaped notch of the pneumatic eccentric ball valve has a cutting function, which can cut off impurities (twigs, textile bags, 等) 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, 耐摩耗性, 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, 化学薬品, 製紙, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
呼び径: DN25～DN300 (MM)
呼び圧力: PN1.0, 1.6, 2.5, 6.4MPa
接続タイプ: ウエハタイプ, フランジ接続
構造タイプ: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
バルブボディ材質: 炭素鋼 WCB, ステンレス鋼 304, ステンレス鋼 316, 316L
漏れ率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)
流量特性: ほぼ等しい割合
制御方法: オンオフタイプ (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. 全開時, 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.
