These valves are used for venting and calibration, Screwed bonnet design.
Bonnet : Back seated blow out proof.
Spindle : Ground and thread rolled.
Packing : Below thread to increase life of package.
Spindle tip : No rotating tip shout off satellite, regulating stiletted and soft seated.
Bonnet pusher : Silver plated for anti galling freezing for increased stem cycle life.
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