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HomeCatalogEXTERNAL CASING ATTACHMENTSBall check valve KOSH2, KOSHBT

EXTERNAL CASING ATTACHMENTS

Ball check valve KOSH2, KOSHBT

Ball Check Valve KOSH-type is applied for prevention of backflow of cement slurry or
drilling mud from outer annulus into inner space of a casing string with nominal diameter
89, 102, 114 and 127 mm.
Ball Check Valve KOSH2 is used in wells where casings (liners) with nominal diameter
89, 102, 114 and 127 mm are run in. Ball Check Valve KOSHBT is used in wells which
collarless casings with nominal diameter 102, 114, 120 and 140 mm are run in. Inner
parts of KOSH valves are made of aluminium alloy.
It is possible to mount KOSH2.114 and KOSH2.127 valves on pipes with thread OTTG 114
and OTTG 127, GOST 632-80.

PARAMETER DESCRIPTION VALUE
KOSH2.89 KOSH2.102 KOSH2.114 KOSH2.127
Casing string nominal diameter RIH with the device, mm 89 102 114 127
Maximum outer diameter of the device, mm 108 110 127 141,3
Drift diameter of the device, mm 76 89 99 111
Ball diameter, mm 46 46 55 55
Maximum internal pressure on the valve body, MPa 25
Maximum pressure differential maintained by the valve in
bottom-top direction, MPa		 10
Length of the device fully assembled, mm 400 380 404 420
Device weight, kg, not more 9,2 9,2 12,8 16,8
Maximum tensile force1
, kN (tn)		 600 (60) 700 (70) 800 (80)
Maximum operating temperature, °C 100
Connecting threads2
,
– top and bottom according to GOST 632-80		 NKT89 ОТТМ102 ОТТМ114 ОТТМ127

1
Calculated value when stresses reach yield point of the material.
2 For KOSH2.89 valve the thread is produced according to GOST 633-80.
For KOSH2.102 valve the thread is produced according to TR 14-161-163-96.

PARAMETER DESCRIPTION VALUE
KOSHBT. 102 KOSHBT. 114 KOSHBT. 120 KOSHBT. 140
Casing string nominal diameter RIH with
the device, mm		 102 114 120 140
Maximum outer diameter of the device, mm 103,2 115,2 121,5 140,5
Drift diameter of the device, mm 86,5 98,5 105 124
Ball diameter, mm 46 55
Valve seat hole diameter, mm 30 40
Maximum internal pressure on the valve body, MPa 25
Maximum pressure differential maintained by the valve in
bottom-top direction, MPa		 10
Length of the device fully assembled, mm 450
Device weight, kg, not more 9,4 11,2 11,97 14,6
Maximum tensile force¹, kN (tn) 600 (60) 700 (70) 770 (77) 900 (90)
Maximum operating temperature, °C 100
Connecting threads2
,
– top and bottom according
to TR 14-157-61-99		 ТМК-3 102 ТМК-3 114 ТМК-3 120 ТМК-3 140

1
Calculated value.
2
Reference only, depends on operating conditions of general mechanical rubber goods in a well.
3
Connecting thread type is agreed with the Customer.