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Main Technical Parameters:
(1). Type: FOSV79.
Exradius O.D. (in / mm): 3 1/9 (79).
Inradius I.D. (in / mm): 4/5 (20).
Connection thread API: 2 7/8HT PAC.
Working pressure (Mpa): 35-70.
(2). Type: FOSV89.
Exradius O.D. (in / mm): 3 1/2 (89).
Inradius I.D. (in / mm): 1 3/16 (30).
Connection thread API: NC 26.
Working pressure (Mpa): 35-70.
(3). Type: FOSV111.
Exradius O.D. (in / mm): 4 3/8 (111).
Inradius I.D. (in / mm): 1 37/64 (40).
Connection thread API: NC 31.
Working pressure (Mpa): 35-70.
(4). Type: FOSV121.
Exradius O.D. (in / mm): 4 3/4 (121).
Inradius I.D. (in / mm): 1 31/32 (50).
Connection thread API: NC 38.
Working pressure (Mpa): 35-70.
(5). Type: FOSV127.
Exradius O.D. (in / mm): 5 (127).
Inradius I.D. (in / mm): 1 31/32 (50).
Connection thread API: NC 38.
Working pressure (Mpa): 35-70.
(6). Type: FOSV133.
Exradius O.D. (in / mm): 5 1/4 (133).
Inradius I.D. (in / mm): 2 11/25 (62).
Connection thread API: NC 40.
Working pressure (Mpa): 35-70.
(7). Type: FOSV159.
Exradius O.D. (in / mm): 6 1/4 (159).
Inradius I.D. (in / mm): 2 4/5 (71).
Connection thread API: NC 46.
Working pressure (Mpa): 35-70.
(8). Type: FOSV165.
Exradius O.D. (in / mm): 6 1/2 (165).
Inradius I.D. (in / mm): 2 13/16 (71.4).
Connection thread API: NC 50.
Working pressure (Mpa): 35-70.
(9). Type: FOSV168.
Exradius O.D. (in / mm): 6 5/8 (168).
Inradius I.D. (in / mm): 2 13/16 (71.4).
Connection thread API: NC 50.
Working pressure (Mpa): 35-70.
(10). Type: FOSV190.
Exradius O.D. (in / mm): 7 1/2 (190).
Inradius I.D. (in / mm): 3 (76.2).
Connection thread API: 5 1/2FH.
Working pressure (Mpa): 35-70. -
Product Description:
Full Opening Safety Valve is a manual control ball type safety used to stop flow through the drill string. FOSV assembled between lower kelly sub and upper drill pipe sub. In the drilling operation, in order to avoid mailgnant accidents, the FOSV shall be connected between drill pipes in drilling process. It can be opened or closed off by simply turning a special operating wrench 900 according to indicated direction.
If the kelly is not made in the drill string and flow occurs, crew members can insert the safety valve in the drill string. This procedure is called stabbing of full opening valve as a large in inside opening as possible. When fully open, flow form the drill pipe passes through the valve with no additional restriction. This relatively large opening allows the crew to stab the valve against pressure coming out of the deill string.
