יתרונות ותפעול של שסתומים כדוריים קבועים בתקן ASME
Advantages of stationary ball valves:
1. איטום חירום עם הזרקת שומן: In the event of unexpected seat seal failure due to foreign objects in the medium or fire, the grease injection valve provides a quick connection to the grease injection gun. The imported pump allows for convenient and rapid injection of grease into the seat seal, מקל על דליפה.
2. Reliable stem sealing and low operating torque: בנוסף לטבעת האיטום הסטנדרטית, the stationary ball valve also features an O-ring on the packing gland, ensuring reliable stem sealing with double sealing. אריזת הגרפיט הנוספת והזרקת שומן ממזערים את דליפת הגבעולים לאחר שריפה. מיסב הזזה של הגזע ומסב הדחף הופכים את פעולת השסתום לקלה.
3. Full bore or reduced bore: Stationary ball valves can be selected with either a full bore or reduced bore structure as needed. For full bore pipeline ball valves, the flow orifice diameter matches the pipeline inner diameter, הקלה על ניקוי צנרת.
4. Extendable stem: The valve stem can be lengthened according to installation or operational requirements. Extended stem fixed ball valves are particularly suitable for applications requiring underground pipeline installation, such as city gas pipelines. The extended stem size is determined according to customer requirements.
5. Flexible Operation: Utilizing valve seats and stem bearings with a low coefficient of friction and excellent self-lubrication, the valve’s operating torque is significantly reduced. לָכֵן, even without the provision of sealing grease, the valve can be operated flexibly and smoothly for extended periods.
Operation and Use of Fixed Ball Valves
1. Before operation, ensure that the pipeline and fixed ball valve have been flushed.
2. Valve operation is completed by rotating the valve stem according to the input signal of the actuator: א 1/4 turn (90°) forward rotation closes the valve. א 1/4 turn (90°) reverse rotation opens the valve.
3. When the actuator’s direction indicator arrow is parallel to the pipeline, the valve is open; when the indicator arrow is perpendicular to the pipeline, the valve is closed.
