Excavator parts PC300-5 PC400-5 Control main valve 709-90-52203 relief valve

  A relief valve for excavator comprises a lifting head 11, a main valve spool 12, a main valve sleeve 13, a pilot valve spool 14, a pressure regulating spring 15 and a pilot valve sleeve. The main valve spool 12 is arranged inside the main valve sleeve 13, the main valve spool 12 is provided with a lifting head 11 and a pilot valve sleeve, and the pilot valve sleeve is provided with a pilot valve spool 14. The pilot valve sleeve is a two-stage split structure, composed of a valve body 16 and a valve cover 17, the valve body away from the valve cover end is arranged in the main valve core, the valve body near the valve cover end turned out to form a boss 18, with the boss in the main valve sleeve is provided with a groove, the two clamping limit constitutes the limit structure. When the structure is in use, because the pilot valve sleeve is divided into two parts valve body 16 and valve cover 17, the main valve sleeve 13 is provided with a groove, the valve body is provided with a boss 18, which is used to fix the valve body 16 radial and axial, the main valve core and the lifting head are arranged in turn inside the main valve sleeve, and the valve body is first placed in the main valve core cavity during installation. Rely on the grooves on the main valve sleeve to limit the valve body axially and radially, and then screw the valve cap into the main valve sleeve and press the valve body to fix the valve body, and then the relief valve can be used normally.

1. An excavator relief valve comprises a lifting head (11), a main valve spool (12), a main valve sleeve (13), a pilot valve spool (14), a pressure regulating spring (15) and a pilot valve sleeve. The main valve spool (12) is arranged inside the main valve sleeve (13), and the main valve spool (12) is provided with a lifting head (11) and a pilot valve sleeve. The pilot valve sleeve is provided with a pilot valve core (14), which is characterized in that the pilot valve sleeve is a two-stage split structure, composed of a valve body (16) and a valve cover (17), the valve body (16) away from the valve cover (17) one end is arranged in the main valve core (12), The valve body (16) near the valve cover (17) - end is internally connected with the main valve sleeve (13) through a limiting structure.
2. According to the claim 1, an excavator relief valve is characterized in that the valve body (16) near the valve cover (17) end is turned out to form a boss (18), and the boss is provided with a groove inside the main valve sleeve (13), and the two clamping limits constitute the limit structure.
The utility model discloses a relief valve for an excavator, including a lifting head, a main valve core, a main valve sleeve, a pilot valve core, a pressure regulating spring and a pilot valve sleeve, the main valve core is arranged inside the main valve sleeve, the main valve core is provided with a lifting head and a pilot valve sleeve, the pilot valve sleeve is provided with a pilot valve core, which is characterized in that the pilot valve sleeve is a two-stage split structure. Composed of a valve body and a valve cover, the valve body away from the valve cover end is arranged in the main valve core, the valve body near the valve cover end through the limit structure and the main valve sleeve internal connection. The utility model divides the pilot valve sleeve into a valve body and a valve cover, thereby reducing the length of the inner cavity of the pilot valve sleeve, improving the processing accuracy of the contact part between the pilot valve sleeve and the pilot valve core, and thereby improving the stability of the relief valve.