国产精品成人观看视频-人体内射精一区二区三区-亚洲av之男人的天堂-色欲av亚洲一区无码少妇

1. Designed for the most arduous of service conditions.

2. Bonnetless one piece forged body, no weld and bolts stress components.

3. Y pattern body improve flow capability and reduce resistance.

4. Integral Stellite Grade 6 cone and Stellite Grade 12 seat have good red hardness and

 scouring resistant characteristics on high temperature.

5. Non-rotating spindle design ensure cone and seat without milling during open or close , 6. Eliminates galling to the seal surfaces, increase service life.

7. Combination filling seal.

8. Heavy two-piece gland bushings.

9. Short and narrow packing chamber.

10. Unique, fully-enclosed spindle drive system.