High pressure valve assembly

A dual bellows assembly for high pressure valve applications, said dual bellows assembly comprising:

• a housing defining an interior;
• a first bellows having a movable back end and a fixed front end opposite said movable back end, said fixed front end being operably coupled to a fixed fitting restrainably affixed along the interior of said housing;
• a second bellows having a fixed back end operably coupled to said fixed fitting, and a movable front end opposite said fixed back end;
• a fluid passage disposed within said fixed fitting, said fluid passage operably connecting said first bellows and said second bellows to form a sealed dual bellows chamber defined by said first bellows, said second bellows and said fluid passage, wherein said first bellows includes a first limiting valve that serves to seal said fluid passage when said first bellows is compressed, and wherein said second bellows includes a second limiting valve that serves to seal said fluid passage when said second bellows is compressed.

A gas lift valve comprising:

• a housing having a proximal end and a distal end;
• a pre-charge chamber having a first fixed end disposed adjacent said proximal end and a second movable end opposite said first fixed end, said pre-charge chamber containing a pressurized pre-charge gas set at a threshold pressure value;
• a first bellows having a movable back end operably coupled to said second movable end of said pre-charge chamber and a fixed front end opposite said movable back end, said fixed front end being operably coupled to a fixed fitting restrainably affixed along the interior of said housing;
• a second bellows having a fixed back end operably coupled to said fixed fitting, and a movable front end opposite said fixed back end;
• a shaft flange operably connected to the movable front end of said second bellows, said shaft flange being coupled by a shaft to a system poppet configured to seal an outlet in said distal end of said housing;
• at least one inlet disposed adjacent said distal end of said housing, said at least one inlet enabling a pressurized intake gas to enter said housing and flow through one or more access channels to exert a pressure against said shaft flange, and, in turn, said movable front end of said second bellows;
• and
• a fluid passage disposed within said fixed fitting, said fluid passage operably connecting said first bellows and said second bellows to form a sealed dual bellows chamber defined by said first bellows, said second bellows and said fluid passage,
• wherein said first bellows includes a first limiting valve that serves to seal said fluid passage when said first bellows is compressed, and
• wherein said second bellows includes a second limiting valve that serves to seal said fluid passage when said second bellows is compressed.