Bottom hole sampler and safety valve.

摘要

@ In the representative embodiment of the invention disclosed herein, upper and lower valve means including rotatable ball members cooperatively seated on axially-movable annular seats are spatially arranged within a tubular housing and independently controlled by upper and lower valve-actuator means. Pressure-responsive means maintain the valve seats sealingly engaged with the ball members regardless of whether the pressure within the sample chamber is greater than or less than the exterior pressure. Reset means coupled to the valve-actuator means allow the valve means to be manually opened and closed while the new and improved sample-collecting tool is at the surface without having to disassemble the tool.