JPH03601Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic relief valve.
Conventionally, this type of hydraulic relief valve has a valve body that can be freely attached to and removed from a valve seat, and the valve body is actuated by the opposing action of the elastic force of an elastic member and the force exerted by the liquid pressure in the inflow path.
The inflow path and the outflow path are connected and disconnected to maintain the liquid pressure in the inflow path at a set value due to the elastic force of the elastic member.

However, with such a configuration, even if the liquid pressure in the inflow path maintained at a set value repeatedly fluctuates even slightly, chattering is likely to occur in which the valve body repeats the movement of contact and separation from the valve seat. For this reason, in order to make it difficult to generate chattering, a liquid chamber is formed into which the liquid pressure in the inflow path is introduced through the constriction path, and the liquid pressure in this liquid chamber is applied to the valve body against the elastic force of the elastic member. With this configuration, the liquid chamber is connected to the inflow path via the throttle path, and the valve is operated by connecting the inflow path and outflow path of the hydraulic pressure relief valve with piping while the inside is filled with air. The air accumulated in the liquid chamber is difficult to be released by the action of the throttle passage, and the problem is that air continues to be mixed into the liquid introduced into the liquid chamber for a long time after the valve starts operating, making it impossible to obtain good relief control. It was hot.

The present invention solves these problems by providing a hydraulic relief valve that is less likely to cause chattering and can easily release air retained in the liquid chamber to the outside at the initial stage of valve operation. .

For this reason, the present invention provides a valve in which a small diameter hole and a large diameter hole are connected to each other to form a valve seat in the continuous stepped part, and an inflow passage that connects to the small diameter hole and an outflow passage that connects to the large diameter hole are provided. The main body is provided with a valve part that connects and disconnects the inflow passage and the outflow passage by being detachable from the valve seat, and a sliding part that slidably fits into the small diameter hole, and the valve part and the sliding part are made to slide. A valve body connected by a shaft portion with a diameter smaller than that of the valve body, an elastic member that applies elastic force to the valve body so that the valve body is seated on the valve seat, and a liquid pressure in an inflow passage introduced through a throttle passage in the valve body. A liquid chamber is formed at the end of the valve body by fitting the sliding part of the valve body into a small diameter hole in the valve body so that the elastic force of the elastic member acts on the valve body, and the liquid chamber is opened to the outside. The valve body is equipped with an open passage provided in the valve body, and a manually operated on-off valve provided with an open passage that can be freely opened and closed so that the air remaining in the liquid chamber is released from the open passage when opened. a spherical ball valve body that seats on a valve seat formed in an open passage to close the open passage or separates from the valve seat to open the open passage;
It is comprised of an operating member that is movable forward and backward for pressing the ball valve body to seat it on the valve seat and releasing the pressure so that the ball valve body is separated from the valve seat.

In such a configuration, the introduction of liquid into the liquid chamber and the extraction of liquid from the liquid chamber are constricted and controlled by the constriction path.
Even if sudden pressure fluctuations occur in the inflow path, the valve body operates slowly, making it difficult for chattering to occur. and,
At the beginning of valve operation, by operating the operating member of the manually operated on-off valve and moving it backward, the pressure of the ball valve element against the valve seat is released, and the ball valve element is released from the valve seat by the force exerted by the liquid pressure in the liquid chamber. The air remaining in the liquid chamber is discharged to the outside through the open path, and then the operating member of the manually operated on-off valve is moved forward to press the ball valve element to seat on the valve seat, closing the open path. . For this reason, the air stagnant in the liquid chamber is discharged to the outside from the open path without being involved in the throttle path, making it difficult to generate chattering and allowing the air stagnant in the liquid chamber to be easily discharged to the outside at the initial stage of valve operation. can.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a valve body, in which a small-diameter hole 2 with a bottom and a large-diameter hole 3 with one end open to the side are connected to form a valve seat 4 in the connected step, and 〓 → connected to the small-diameter hole 2. An inlet passage 5 and an outlet passage 6 connected to the large diameter hole 3 are provided. 7 is a valve body that can be attached to and removed from the valve seat 4 to connect and shut off the inflow passage 5 and the outflow passage 6 =→Slideably inserted into the valve part 8 and the small diameter hole 2 →Sliding part 9 are connected by a shaft portion 10, and the shaft portion 10 of the valve body 7 is provided so as to form an annular space between it and the inner periphery of the small diameter hole 2. 1
1 is a lid member screwed onto the valve body 4; 12 is a spring as an elastic member, which is provided to apply elastic force to the valve body 7 so that the valve portion 8 is seated on the valve seat 4;
The elastic force can be freely adjusted by means of an adjustment member 13 screwed into the member 1. 14 is a nut for preventing rotation of the adjustment member 13. 15 is a liquid chamber formed at the end of the valve body 7 by fitting the sliding portion 9 of the valve body 7 into the small diameter hole 2; 16 is a flow path provided in the valve body 7; 17 is a fluid chamber formed in the valve body 7;
The aperture passage 18 is provided through a screw member screwed into the aperture. 20 is an open path for opening the liquid chamber 15 to the outside;
The valve body 1 is provided with a valve seat 21 and a threaded portion on the outside of the valve seat 21. Reference numeral 19 denotes a manually operated on-off valve which is provided to open and close the open passage 20 so that the air remaining in the liquid chamber 15 is discharged to the outside from the open passage 20 when the opening operation is performed. There is. The ball valve body 22 is formed into a spherical shape and is arranged in the open passage 20 so that it can sit on the valve seat 21 to close the open passage 20 or leave the valve seat 21 to open the open passage 20. The operating member 23 is screwed into a threaded portion formed in the open passage 20 in order to press the ball valve body 22 to seat on the valve seat 21 or release the pressure so that the ball valve body 22 is separated from the valve seat 21. It is provided so that it can move forward and backward in response to rotational operation from the outside. A notch 24 is formed in the outer circumferential surface of the operating member 23 along the advancing and retreating direction.

Next, the operation of this configuration will be explained.

Assume that the interior is filled with air in the illustrated state.

Therefore, the inflow path 5 is connected to the pump side and the outflow path 6 is connected to the tank side, and when liquid is supplied to the inflow path 5, it is introduced into the liquid chamber 15 via the flow path 16 and the throttle path 18.
The valve body 7 is actuated by the opposing action of the elastic force of the spring 12 and the acting force due to the pressure in the liquid chamber 15, and at the beginning of the valve operation, the air inside the valve flows into the outflow path 6 along with the liquid.
However, due to the presence of the restricting passage 18, the air remaining in the liquid chamber 15 is difficult to be discharged.

Therefore, in the early stage of valve operation, the manually operated on-off valve 19
By rotating the operating member 23 and retracting it upward in the figure, the pressure of the ball valve body 22 against the valve seat 21 is removed, and the ball valve body 22 is moved by the force exerted by the liquid pressure in the liquid chamber 15. Separated from the valve seat 21, the liquid chamber 15
The accumulated air is discharged to the outside from the open passage 20, and then the operating member 23 is rotated to move forward to the state shown in the figure, pressing the ball valve body 22 and seating it on the valve seat 21.
The liquid pressure in the inflow path 5 controls the operation of the valve body 7 by the opposing action of the elastic force of the spring 12 and the force exerted by the liquid pressure in the liquid chamber 15, and controls the liquid introduction into the liquid chamber 15 and the liquid pressure from the liquid chamber 15. The liquid discharge is controlled by the restrictor passage 18, and even if a sudden pressure fluctuation occurs in the inflow passage 5, the valve body 7 operates slowly, and chattering of the valve body 7 is difficult to occur, so that good relief control can be obtained. Further, the manually operated on-off valve 19 is connected to the ball valve body 22 by the operation member 23.
The opening path 20 is opened and closed by pressing the ball valve body 22 to seat it on the valve seat 21 or by releasing the pressure from the operation member 23 and leaving the ball valve body 22 from the valve seat 21. The spherical shape makes it easy to seat on the valve seat 21, and the opening path 20 can be reliably closed.
5 to the outside through the open path 20.

Furthermore, a manually operated on-off valve 19 as shown in the figure.
If the hydraulic pressure relief valve is installed so that it is located at the top, the manually operated on-off valve 19 opens the open passage 20 and releases the air accumulated in the liquid chamber 15 to the outside, and the air is released as part of the liquid in the liquid chamber 15. When all the air accumulated in the liquid chamber 15 is discharged to the outside together with the liquid, only the liquid is discharged to the outside, so that completion of the discharge of air to the outside can be easily confirmed from the outside. Furthermore, since the throttle passage 18 is provided in the valve body 7, compared to the case where the throttle passage is provided in the valve body,
The open passage 20 provided in the valve body 1 can be formed without being restricted by the throttle passage 18 and can be provided at an optimal position in the valve body.

In this way, the present invention has a small diameter hole and a large diameter hole connected to each other to form a valve seat in the continuous stepped part, and an inflow passage connected to the small diameter hole and an outflow passage connected to the large diameter hole. A valve body, a valve part that can be attached to and removed from the valve seat to block communication between an inflow passage and an outflow passage, and a sliding part that slidably fits into a small diameter hole are provided, and the valve part and the sliding part are slidable. A valve body connected by a shaft portion with a diameter smaller than that of the valve body, an elastic member that applies elastic force to the valve body so that the valve body is seated on the valve seat, and a liquid pressure in an inflow passage introduced through a throttle passage in the valve body. A liquid chamber is formed at the end of the valve body by fitting the sliding part of the valve body into a small diameter hole in the valve body so that the elastic force of the elastic member acts on the valve body, and the liquid chamber is opened to the outside. The valve body is equipped with an open passage provided in the valve body, and a manually operated on-off valve provided with an open passage that can be freely opened and closed so that the air remaining in the liquid chamber is released from the open passage when opened. a spherical ball valve body that seats on a valve seat formed in an open passage to close the open passage or separates from the valve seat to open the open passage;
It is constructed with an operating member that can move forward and backward to press the ball valve body to seat it on the valve seat and release the pressure so that the ball valve body leaves the valve seat, thereby making it difficult to generate chattering. Therefore, the air remaining in the liquid chamber can be easily discharged to the outside at the initial stage of valve operation, and good relief control can be obtained.

In addition, the manually operated on-off valve opens and closes the opening path by pressing the ball valve element with the operating member to seat it on the valve seat, or by releasing the pressure from the operating member and removing the ball valve element from the valve seat. Therefore, the ball valve body is spherical and easily seats on the valve seat, and the open path can be reliably closed, and liquid leakage from the liquid chamber to the outside through the open path can be effectively prevented. Furthermore, if a hydraulic pressure relief valve is installed so that the manually operated on-off valve is located at the top, the manually operated on-off valve will open the opening path and release the air accumulated in the liquid chamber to the outside. When all the air accumulated in the liquid chamber is discharged to the outside along with a part of the liquid, only the liquid is discharged to the outside, so that it is possible to easily confirm from the outside that the air has been discharged to the outside. Furthermore, since the throttle passage is in the valve body, compared to the case where the throttle passage is in the valve body, the open passage provided in the valve body can be placed in the optimum position of the valve body without being restricted by the throttle passage. It has the effect that it can provide.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a hydraulic relief valve showing an embodiment of the present invention. 1...Valve body, 2...Small diameter hole, 3...Large diameter hole,
4... Valve seat, 5... Inflow path, 6... Outflow path, 7...
... Valve body, 8 ... Valve part, 9 ... Sliding part, 10 ... Shaft part, 12 ... Elastic member, 15 ... Liquid chamber, 18 ...
Restriction path, 19...manually operated on-off valve, 20...release path.

Claims (1)

[Scope of utility model registration request] A valve body having a small-diameter hole and a large-diameter hole connected to each other to form a valve seat in the continuous stepped part, and an inflow passage connected to the small-diameter hole and an outflow passage connected to the large-diameter hole, and a valve body that connects to the valve seat. A valve part that can be moved apart to block communication between the inflow and outflow channels and a sliding part that slidably fits into a small diameter hole are provided, and the valve part and the sliding part are connected by a shaft part that has a smaller diameter than the sliding part. an elastic member that applies an elastic force to the valve body so that the valve part is seated on the valve seat, and a fluid pressure in an inflow passage introduced through a constriction passage in the valve body that opposes the elastic force of the elastic member. A liquid chamber is formed at the end of the valve body by fitting the sliding part of the valve body into a small diameter hole in the valve body to act on the valve body, and an opening is provided in the valve body to open the liquid chamber to the outside. A manually operated on-off valve is provided in which the open passage can be opened and closed so that the air remaining in the liquid chamber is discharged to the outside from the open passage when the opening operation is performed. A spherical ball valve body that closes the open path when seated or leaves the valve seat to open the open path, and a ball valve body that presses the ball valve body to seat on the valve seat or lifts the ball valve body from the valve seat. A hydraulic relief valve consisting of an operating member that can move forward and backward to release pressure.