Field removable bonnet assemblies for use with valves

An internal valve, comprising:

• an internal valve body comprising external threads, a first chamber having first internal threads, and a second chamber having second internal threads, the external threads to threadably engage another body having a pressurized chamber, a longitudinal axis of the first chamber being substantially perpendicularly positioned relative to a longitudinal axis of the second chamber;
• and
• a field removable bonnet assembly, comprising:
• a body having threads about an exterior surface to threadably engage the second internal threads to couple the body to the internal valve body;
• a shaft to be at least partially positioned within the body;
• and
• an adjuster comprising a first adjuster portion and a second adjuster portion, the body defining a bore having a first diameter portion and a second diameter portion larger than the first diameter portion, the first diameter portion to receive a valve packing, the second diameter portion to be threadably engaged by the second adjuster portion, wherein the adjuster is externally accessible to adjust the first adjuster portion within the first diameter portion to change a force exerted by the valve packing on the shaft.