PQ640F שסתום כדורי אקסצנטרי פניאומטי API6D & API607
דגם שסתום: PQ640F, PQ640H
קוטר נומינלי: DN25～DN300
מִבְנֶה: Eccentric Rotating Ball Core
חומר גוף השסתום: Carbon Steel WCB, נירוסטה 304, נירוסטה 316
לחץ נומינלי: PN10, PN16, PN25, PN40
טמפרטורה ישימה: -20℃～450℃
Applications: Steam, מַיִם, שֶׁמֶן, גַז, corrosive media
Features: High performance, חיי שירות ארוכים, 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, ומומנט פתיחה וסגירה נמוך. 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, ביטול בלאי בטבעת האיטום והתגברות על בעיית הבלאי הקבוע בין משטח האיטום לכדור בשסתומי כדור מסורתיים. חומר אלסטי לא מתכתי מוטבע במושב המתכת, 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, וכו') 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, עמיד בפני שחיקה, 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, כִּימִי, ייצור נייר, and sewage treatment industries for on/off switching or flow regulation.
Pneumatic Eccentric Ball Valve Technical Parameters
קוטר נומינלי: DN25～DN300 (מ.מ)
לחץ נומינלי: PN1.0, 1.6, 2.5, 6.4MPa
סוג חיבור: סוג רקיק, חיבור אוגן
סוג מבנה: Straight-through eccentric ball valve
Actuation Type: Compressed air 4-7bar (manual device optional)
חומר גוף השסתום: פלדת פחמן WCB, נירוסטה 304, נירוסטה 316, 316ל
שיעור דליפה ש: 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)
מאפייני זרימה: בערך אחוז שווה
Control Method: סוג הפעלה/כיבוי (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. כשפתוח לגמרי, 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. במהלך פתיחה וסגירה של השסתום, 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.
