NEEDLE VALVE FOR PRESSURE GAGE Russian patent published in 2013 - IPC E21B34/16 F16K1/02 F16K41/04 

FIELD: oil and gas industry.

SUBSTANCE: needle valve for pressure gage contains a body (1) connected indirectly to rod (2) equipped with threaded seat (3) at one end. At that in the body (1) there is ball seal valve (10) of chevron-type, main bush (9). The latter one is connected to the body by means of a connecting element 12. Besides, the body (1) is connected by means of threaded joint to fastening element (5), which is connected by circular grooves and locking ring with rod (2). Besides body (1) is equipped with bleed-off valve (15).

EFFECT: improving accuracy of pressure gage readings, tightness, durability and reliability of design.

3 cl, 3 dwg