JPS6145421Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a chattering prevention device for a relief valve, which is a pressure regulating valve that limits the maximum pressure value in an operating circuit and ensures the safety of the device.

In a relief valve, when the pressure in the operating circuit increases, this pressure applies pressure to the valve, overcomes a spring such as a coil spring installed in the valve, moves the valve, and moves the valve between the valve and the valve seat. Leak occurs through the gap created. Due to this pressure leak, the rising pressure drops rapidly, and the valve is pushed back by the bullet and crashes into the valve seat, and when this action is repeated continuously,
Generates abnormal noise. This phenomenon is called chattering, which damages the valve seat and shortens the life of the valve, which is a problem that needs to be solved.

This invention is an effective solution to the conventional problems.The purpose of this invention is to provide a relief valve that is simple in structure, reliable in its operation, and reduces damage to the valve. The present invention provides a valve chattering prevention device.

According to this invention, this purpose is achieved by one of the valve discs.
The secondary side pressure chamber of the valve body is a check valve that operates to eliminate pressure increase or negative pressure generated in the large diameter portion of the valve body by a valve that moves in response to pressure caused by an increase in pressure in the downstream side pressure chamber. Provided between the large diameter part,
This is achieved by providing a pore between the secondary pressure chamber and the large diameter portion so as to delay the return of the valve that is pushed back due to the pressure drop in the primary pressure chamber.

Hereinafter, preferred embodiments of this invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a front cross-sectional view of a valve equipped with a chattering prevention device, in which a relief valve 1 has a valve body 3
, a pressure adjustment knob 5, a valve 7, a bullet 9 such as a spring, a chattering prevention device 11, and the like. The valve body 3 has a primary pressure chamber 13 having a pressure p, a secondary pressure chamber 15 having a pressure Q lower than the normal pressure p, and a space between the primary pressure chamber 13 and the secondary pressure chamber 15. A valve seat 21 provided in the
It includes a small diameter portion 17, a large diameter portion 19, and the like. The pressure adjustment knob 5 is screwed into the end of the large diameter section 19. Further, the valve 7 includes a valve tip portion 23 that can freely engage with a valve seat 21, a small diameter portion 27 and a large diameter portion 2 that are movably provided in a small diameter portion 17 and a large diameter portion 19.
It consists of a valve stem portion 25 having a diameter of 9, and the like. Note that the large diameter portion 19 of the valve shaft portion 25 allows the large diameter portion 19 to
It is divided into two first space sections 20 and a second space section 20A. Therefore, the ammunition 9 is in the first space 2
0, the pressure setting knob 5 is accommodated between the pressure adjustment knob 5 and the large diameter portion 29 of the valve stem portion 25.
Due to the screwed position of the valve 7, the pressure of the valve 7 is applied to the valve seat 21, and the pressure is adjusted. The chattering prevention device 11 includes a check valve 31 provided in the second space 20A of the large diameter portion 19 and a large diameter portion 2 of the valve shaft portion 25.
It is composed of pores 33 provided in 9 and the like. The valve portion 35 of this check valve 31 is connected to the small diameter portion 2 of the valve shaft portion 25.
The second through hole 39, which is provided in the valve body 3 and communicates with the secondary pressure chamber 15, is pressed by a bullet 37, which is movably provided in the valve body 7 and has a smaller elasticity than the bullet 9, such as a spring. It engages with the valve seat 41 provided on the side of the space 20A. Furthermore, the pores 33 are arranged so that the first space 20 and the second space 20A are electrically connected to each other.
This is a small orifice-shaped hole provided in the large diameter portion 29. Furthermore, a conduction hole 43 is provided between the secondary pressure chamber 15 and the first space 20, and an O-ring 45 is provided between the large diameter portion 19 and the tip of the pressure adjustment knob 5. ing.

The operation of this embodiment with the above configuration will be explained. Now, if the pressure P in the primary pressure chamber 13 rises and presses the valve 7, and moves the valve 7 to the right against the elastic force of the bullet 9, the valve tip 23 and the valve A gap is created between the seat 21 and the secondary pressure chamber 15.
conducts with. At this time, due to the movement of the valve 7, the second space 20A expands and generates a negative pressure, and the valve part 35 of the check valve 31 moves away from the valve seat 41 against the elastic force 37 and penetrates. The fluid in the secondary pressure chamber 15 flows into the second space 20A through the hole 39, and the second
The space 20A is filled to eliminate negative pressure. On the contrary, the second space 20 is contracted and the fluid flows out to the secondary pressure chamber 15 through the communication hole 43. In addition, due to this movement of the valve 7, fluid is introduced from the primary pressure chamber 13 to the secondary pressure chamber 15, the pressure P decreases rapidly, and the valve 7 is pushed back to the left by the bomb 9. In this case, the fluid filling the second space 20A cannot flow out because the through hole 39 is closed by the check valve 31, and flows out through the small hole 33.
Since the return of the pressure P is delayed, the pressure P has already been recovered before the valve seat 21 closes, and the pressure P of the bomb 9 and the pressure P
A stable pressure P that does not cause chattering is maintained.

FIG. 2 shows a front cross-sectional view of a valve equipped with another anti-chattering device. The check valve 51 provided in the hole 49, the first space 20 and the second space 2
It is comprised of an orifice-like pore 33 provided in the large diameter portion 29 so as to communicate with the 0A. The check valve 51 opens only when the valve 7 is moved to the right under pressure due to an increase in the pressure P in the primary pressure chamber 13, and the check valve 51 opens the fluid in the secondary pressure chamber 15. The second space 20A can be filled through the through hole 49. When the valve 7 is pushed back to the left due to a decrease in the pressure P, the check valve 51 prevents the fluid in the second pressure chamber 20A from flowing out, and the fluid flows out through the pore 33, causing the valve 7 to return. is delayed, and a stable pressure P that does not cause chattering is maintained.

FIG. 3 shows a front sectional view of a valve equipped with yet another anti-chattering device, in which the anti-chattering device 53 penetrates between the secondary pressure chamber 15 and the second space 20A in the valve body 3. The valve body 3 is configured to conduct between the check valve 51 provided in the through hole 49, the secondary pressure chamber 15, and the second space 20A.
It is composed of orifice-like pores 55 and the like provided in the. As in FIGS. 1 and 2, the check valve 51
is opened only when the valve 7 moves to the right due to an increase in pressure P, and the fluid in the secondary pressure chamber 15 passes through the through hole 49 and fills the second space 20A, increasing the pressure. Due to the lowering of P, the check valve 51 prevents the fluid in the second space 20A from flowing out, the fluid flows out through the pore 55, and the return of the valve 7 is delayed, resulting in a stable pressure P that does not cause chattering. is retained.

FIG. 4 shows a front sectional view of yet another anti-chattering device, in which the anti-chattering device 57 is
A check valve 5 provided in a communication hole 43 that communicates between the secondary pressure chamber 15 and the first space 20 in the valve body 3
9, as well as the secondary pressure chamber 15 and the first space 20
It is composed of an orifice-like pore 61 etc. provided in the valve body 3 so as to conduct between the valve body 3 and the valve body 3. When the valve 7 moves to the right due to the increase in pressure P, the first space 20 is compressed and the internal pressure increases. Due to this rise, the check valve 59 opens, and the fluid in the first space 20 flows out into the secondary pressure chamber 15 through the communication hole 43, thereby eliminating the increase in internal pressure. During this time, the pressure P
When the valve 7 is pushed back to the left by lowering, the first space 20 is expanded and a negative pressure is generated. The check valve 59 prevents the fluid from flowing in against this negative pressure, and the fluid passes from the secondary pressure chamber 15 through the pore 61 to the first
It flows into the space 20. Therefore, the return of the valve 7 is delayed, and a stable pressure P that does not cause chattering is maintained.
is retained.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration. Between the space or the first space and the secondary pressure chamber, when the valve tip moves away from the valve seat and the valve moves in the direction of compressing the bullet, negative pressure in the second space or the 1
Since it is provided with a check valve that operates to eliminate the pressure increase in the space, it operates quickly in response to the pressure increase in the primary pressure chamber.

Further, when the valve is returned by the action of the bullet, a path for fluid discharged from the second space or a path for fluid sucked into the first space is communicated with the second side pressure chamber. Since the valve is provided and formed into pores, the return of the valve is relatively slow and no chattering phenomenon occurs.

It should be noted that the present invention is not limited to this embodiment, and may be implemented in other similar embodiments.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a valve equipped with an anti-chattering device, FIG. 2 is a front sectional view of another anti-chattering device, and FIGS. 3 and 4 are sectional front views of still other anti-chattering devices. . Explanation of the symbols representing the main parts of the drawing, 3...
Valve body, 7... Valve, 11, 47, 53, 57,...
Chattering prevention device, 13...primary side pressure chamber,
15...Secondary side pressure chamber, 21...Valve seat, 31,5
1, 59... Check valve, 33, 55, 61... Pore.

Claims (1)

[Scope of utility model registration request] A valve seat 21 is formed and provided in a communication portion that communicates the primary side pressure chamber 13 and the secondary side pressure chamber 15 formed in the valve body 3, and a valve tip portion 2 that can freely engage with the valve seat 21 is provided.
3, the small diameter part 27 and the large diameter part 29
a small diameter portion 1 formed in the valve body 3 and communicating with the secondary pressure chamber 15;
7, the small diameter portion 27 of the valve 7 is fitted into the large diameter portion 19 formed on the valve body 3, and the large diameter portion 29 of the valve 7 is fitted into the large diameter portion 19, which is connected to the small diameter portion 17 and formed on the valve body 3; Between the pressure adjustment knob 5 adjustably screwed into the large diameter portion 19 and the large diameter portion 29, an elastic device 9 for pressing the valve tip 23 against the valve seat 21 is loaded. and the first space 20 or second space 20A of the large diameter portion 19 partitioned by the large diameter portion 29 and the secondary pressure chamber 15 are provided in communication via a communication hole, Second space 20A
Alternatively, between the first space 20 and the secondary pressure chamber, when the valve 7 moves in the direction in which the valve tip 23 separates from the valve seat 21 and compresses the bullet 9,
Negative pressure in the second space 20A or the first space 20
A check valve is provided that operates to eliminate the pressure increase of
When the valve 7 is returned by the action of the bullet 9, the path of the fluid discharged from the second space 20A or the path of the fluid sucked into the first space 20 is connected to the secondary pressure chamber. 15. A chattering prevention device for a relief valve, characterized in that the relief valve chattering prevention device is provided in communication with the relief valve 15 and is formed into a fine hole.