JPH01133502U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of this invention, a part of which is represented by symbols, Fig. 2 is a sectional view of a conventional fluid circuit, a part of which is shown by symbols, and Fig. 3 is a sectional view of a conventional fluid circuit. FIG. 3 is a circuit diagram of FIG. 2; 21...Switching valve, 24...Fluid motor, 25, 26
...Supply/discharge passage, 46...Relief valve, 49...Relief passage, 52...Chamber, 56, 58...Pilot passage.

Claims (1)

[Scope of utility model registration request] A fluid motor, a switching valve, a pair of supply and discharge passages that connect the fluid motor and the switching valve and supply and discharge high-pressure or low-pressure fluid to the fluid motor, and a relief passage that connects these supply and discharge passages. One relief valve has a spool that is provided and is normally biased in the closing direction by a spring, and a pilot that guides the internal pressure of each supply/discharge passage to the relief valve and presses the spool of the relief valve in the opening direction. A passage and
When the spool of the relief valve moves in the closing direction, the chamber whose volume increases due to the movement of the spool is connected to the low pressure side, thereby connecting the spool of the relief valve to the elastic force of the spring and the supply/discharge path. A fluid circuit characterized in that the fluid circuit is moved only by a pressing force based on the internal pressure of the fluid circuit.