Top entry valve for severe industrial applications

A top entry valve for severe industrial applications, said top entry valve comprising:

• a single piece metallic body;
• a rotatable valve structure fitted within said body between valve seats also fitted into said body, said valve seats making sealing engagement with said valve structure, said valve structure having an aperture there-through for passing a fluid flow when in a predetermined open rotational position and for blocking a fluid flow when in a predetermined closed rotational position;
• said body including a top opening sized to accept entry of the valve structure and its associated seats;
• a first metal bonnet configured for bolted and sealed connection to the top of said body;
• a rotatable valve operating stem integral with or operatively connected to the top of said valve structure so as to rotate the valve structure when the stem is rotated;
• and
• a second metal bonnet configured for bolted and sealed connection to a bottom of said body,
• wherein said first bonnet has an aperture at its top sized to accept a sealed upper portion of said stem,
• wherein said body includes a bottom opening that is covered by the connected second bonnet,
• wherein said first bonnet is configured with external fins to dissipate heat and reduce a temperature of a sealing between bonnet and the stem.