JPS62108674U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the relief valve with check valve of the present invention, Fig. 2 is an enlarged sectional view of the lower left part of Fig. 1, and Fig. 3 is a sectional view of Fig. 2 showing the second embodiment. FIG. 4 is a cross-sectional view showing an example of a hydraulic control circuit incorporating a relief valve with a check valve, and FIG. 5 is a cross-sectional view of a conventional relief valve with a check valve. 1: tank, 2: pump, 3: lever, 4: switching valve, 5: relief valve, 6: check valve, 7: secondary flow path, 8: primary flow path, 9: bulkhead, 10: outer wall, 11: Casing, 11a: Large diameter part, 11b
: Small diameter part, 12: First lid body, 13: Inward flange, 14: Second lid body, 15: Sphere, 16: Compression spring, 17: First through hole, 18: Valve body, 19: Compression Spring, 20: second through hole, 21: third through hole,
22: Communication hole, 23: End face, 24: Step part, 25:
Pressure guiding path, 26: second valve body, 27: stop ring, 28: compression spring, 29: conical wall, 30, 32:
Outward flange, 31, 32: step, 33: vertical wall,
34: Passage, 35: Space.

Claims (1)

[Scope of utility model registration request] The first portion of the cylindrical casing, which is located outside the outer wall of the cylindrical casing that oil-tightly penetrates the partition wall that partitions the primary flow path and the secondary flow path, and the outer wall that partitions the secondary flow path and the outside. A lid body is screwed onto the end opening, and a bottomed cylindrical second valve body is freely movable in the axial direction inside the remaining second part of the casing, which is located inside the casing from the outer wall. and a first compression spring is provided between the second valve body and a member that is fitted with a limited amount of movement in the direction of the first part and is locked inside the end opening of the second part. Then, the second valve body is given elasticity toward another valve body, and the remaining part of the second part, which is closer to the first part than the part where the second valve body is fitted, is given elasticity. Another valve body having a cylindrical bottom and an opening on the second valve body side is fitted in such a manner that it can freely slide in the axial direction and the amount of movement in the direction of the second valve body is limited. A second compression spring is provided between the end of the body opposite to the second valve body and the lid body, and a second compression spring is provided at a portion of the second portion closer to the first portion than the portion where the second valve body is fitted. A through hole that communicates the inside and outside of the casing is drilled at a position that aligns with the next flow path,
A communication hole that communicates between the inside and outside of this other valve element is bored at a position on the side surface of the valve element of the valve that almost aligns with the above-mentioned through hole, and the outer peripheral surface of the second valve element side end of the other valve element and the The outer circumferential surface of one of the two valve bodies with the outer circumferential surface of the other end of the valve body is
A conical surface whose outer diameter becomes narrower toward the end edge, and this conical surface is the inner conical surface between the outer peripheral edge of the valve body side end surface of the second valve body and the outer peripheral edge of another valve body side end surface. The second valve body is made to face a short cylindrical vertical wall formed on the outer circumferential edge of the side where no A relief valve with a check valve, which is provided with a passage that communicates with a space surrounded on three sides.