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Thread connection O.D.
mm(inch)
I.D.
mm(inch)
OAL
mm(inch)
Working pressure

(Mpa)

NC26 88.9 (3-1/2) 31.75 (1-1/4) 686 (27) 70 (35)
NC26 95 (3-3/4) 35 (1-3/8) 660 (26) 70 (35)
NC31 104.8 (4-1/8) 41.3 (1-5/8) 711 (28) 70 (35)
NC31 111 (4-3/8) 35 (1-3/8) 670 (26-3/8) 70 (35)
NC38 120.1 (4-3/4) 50 ( 2 ) 462 (30) 70 (35)
NC38 121 (4-3/4) 45 (1-49/64) 685 (26-31/32) 70 (35)
NC46 158.75 (6-1/4) 61.9 (2-7/16) 838 (33) 70 (35)
NC50 159 (6-1/4) 57.2 (2-1/4) 760 (29-59/64) 70 (35)
NC50 165 (6-1/2) 57.2 (2-1/4) 760 (29-59/64) 70 (35)
NC50 168.28 (6-5/8) 71.4 (2-13/16) 838 (33) 70 (35)
5 1/2FH 177.8 ( 7 ) 76.2 ( 3 ) 889 (35) 70 (35)
HT55 177.8 ( 7 ) 57.2 (2-1/4) 998 (38-57/64) 70 (35)
6-5/8REG 203.2 ( 8 ) 76.2 ( 3 ) 965 (38) 70 (35)
6-5/8REG 203.2 ( 8 ) 71.4 (2-13/16) 998 (38-57/64) 70 (35)
7-5/8REG 241(9-1/2) 71.4 (2-13/16) 998 (38-57/64) 70 (35)
7-5/8REG 241(9-1/2) 76.2 ( 3 ) 965 (38) 70 (35)

The IBOP is a non-return valve (check valve), also called Gray Valve or BVR, is a back pressure valve used in the drill string to prevent the well from flowing uncontrollably up the drill string. It is used to hold the tool open therefore it is possible to stab the valve while the fluid is flowing through the drill pipe. With the IBOP valve installed in the drill string, it allows you to strip in hole without mud flowing through the drill sting. The IBOP valve should not be used for shut the well in while tripping.

We produce H2S resistance Inside Bop Valves, which adopt high quality import sulfur-resistance material.

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Lake Petro is located in Dongying City, which is famous for Shengli Oilfield and the largest manufacturing hub of petroleum equipment in China. Following the principle of “quality first, science and technology innovated, people oriented”, every Lake Petro person is sparing no effort to provide the customers with best products and services. Our products are based on advanced production line and testing equipment, our products are designed and manufactured according to certification of API, ISO, GOST, etc.