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   The mechanical stage cementer which is mainly used for vertical well features inner closing structure. The circulation ports are opened by free-fall or pumping-down plug and finally the closing plug drives the closing sleeve to shut the circulation ports.
    Features：1.With inner-closing structure, the cementer can bring permanent self-locking after closing 
              2.Special structure can minimize the damages to the closing-sleeve
              3.The cementer is designed with anti-rotating structure for easy drillout

 
   Property Parameters
 

Specifications（mm）	Φ139.7（4"）～Φ244.5（9"）
Max O.D.（mm）	170～283
Drill-out I.D.（mm）	124～220.5
Overall length（mm）	1038～1222
Rated load（t）	120～210
Sealing capacity（MPa）	25
Opening pressure（MPa）	17～18
Closing pressure (MPa)	5
Lower sliding sleeve I.D.(mm)	85～176
Upper sliding sleeve I.D.(mm)	95～197