Two-way constant pressure valve

• Main Authors: LIANG QUANQING, YUAN HAIKUN
• Format: Patent
• Language: Chinese; English
• Published: 19.05.2010
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model relates to a two-way constant pressure valve, which comprises a shell, valve seats and a valve ball, the reverse circulation valve seat is screwed in the shell, a reverse circulation valve core is a U-shaped body, the lower part of which is open, the outer diameter of the reverse circulation valve core is smaller than the inner diameter of the lower part of the shell, a centering block is arranged on the outer tubular wall, and the lower spherical surface is matched with the upper spherical surface of the reverse circulation valve seat; a limit sleeve is mounted on the lower end surface in the reverse circulation valve core, the outer diameter of the limit sleeve is smaller than the inner diameter of the reverse circulation valve core, the tubular wall is provided with a flow passage, and a forward circulation pressure regulation spring and the valve ball are mounted sequentially from the bottom up in the limit sleeve; the forward circulation valve seat is screwed on the upper end of the rev