FOSV is dual body full-opening safety valve, so it does not interfere with the running of tools such as core barrels or survey instruments. It is designed to be stabled into the top joint of drill pipe or tubing string at the rig floor and closed quickly in case a well kicks.
The ball-type design permits the valve to be compact, easy to handle, and yet have great strength, standard test pressure is 10000PSI, but higher pressure ratings are available.
FOSV and operating wrench should be maintained on the rig floor at all times.

Model	XS105-T44	XS110-T51	XS124-T62	XS127-T62	XS133-T57	XS133-T57	XS134-T62
O.D	￠105	￠110	￠124	￠127	￠133	￠133	￠134
I.D	￠44	￠51	￠62	￠62	￠57	￠57	￠62
Connection	2A10*2A11	210*211	2-7/8EUE	2-7/8EUE	XT39	4-1/2VAM	310*311
Length	732	726	578	578	773	773	800
Model	XS134-T62	XS146-T50.8	XS152-T76	XS152-T76	XS178-T76	XS178-T76.2	XS190-T82.6
O.D	￠134	￠146	￠152	￠152	￠178	￠178	￠190
I.D	￠60	￠50.8	￠76	￠76	￠76	￠76.2	￠82.6
Connection	4-1/2NU	NC31	3-1/2NU	3-1/2EUE	3-1/2EUE	4A10*4A11	410*411
Length	580	832	640	617	675	885	895