JPS62162477U - - Google Patents

Description

[Brief explanation of the drawing]

Drawings 1 and 2 show an embodiment of this invention; Fig. 1 is a circuit diagram, Fig. 2 is a sectional view, Fig. 3 is a sectional view showing the second embodiment, and Figs. 4 and 5 are A conventional device is shown, with FIG. 4 being a circuit diagram and FIG. 5 being a sectional view. 22, 23...Relief valve, 30, 31...2
Secondary pressure chamber, 32, 33, 47...Shockless piston, 34, 35, 48...Buffer chamber, 37a...
Seat portion, 38... Poppet member, 38c... Orifice, 43, 49... Damper chamber, 46, 52
...Check valve.

Claims (1)

[Scope of utility model registration request] The inflow side and the secondary pressure chamber are communicated through an orifice formed in the poppet member, and a buffer chamber defined by a shockless piston is connected to the secondary pressure chamber, and when the relief valve is activated, The shockless piston moves under the action of the secondary pressure chamber, expands the volume of the buffer chamber, and secures the flow rate to the orifice formed in the poppet member, and due to the action of the differential pressure generated before and after the orifice. While controlling the opening degree of the seat part, when the above-mentioned shockless piston reaches the stroke end, the opening degree of the seat part is controlled by the difference in pressure receiving area between the inflow side of the relief valve and the secondary pressure chamber. In a pressure boosting shock absorber for a relief valve, a damper chamber that exhibits a damping function is provided near the stroke end of the above-mentioned shockless piston, and the damper chamber is provided only when the above-mentioned shockless piston returns to its original position. A relief valve pressure boosting buffer equipped with a check valve that allows hydraulic oil to flow into the system.