Safety gate valve for petroleum wells, permitting operation by a
Safety system
Safety valve
Safety valve
Safety valve
Safety valve and ball type equalizing valve
Safety valve for oil-wells and installation tool for the valve
Safety valve hydraulically operated by telescopic drill stem mov
Safety valve in particular for closing an oil well
Safety valve utilizing an isolation valve and method of...
Safety valve, sealing ring and seal assembly
Safety valve, sealing ring and seal assembly
Safety valve, sealing ring and seal assembly
Safety valves for wells
Self closing equalizing valve for a subsurface well safety valve
Shifting tool
Shut-in tools
Single-phase annulus-operated sliding sleeve
Sleeve valve device and shifting tool therefor
Sleeve-type low pressure responsive APR tester valve