JP5508883B2 - Pressure relief valve and seismic damper - Google Patents

Description

The present invention relates to an improvement in a pressure regulating relief valve and a seismic isolation damper .

  Conventionally, in this type of pressure regulating relief valve, for example, it is provided in the middle of a passage communicating two pressure chambers provided inside a damper used for a seismic isolation application that generates particularly high damping force. A cylindrical housing having a valve hole provided with an annular valve seat, a valve body that can be freely attached to and detached from the annular valve seat and accommodated in the valve hole, and a spring seat that is screwed onto the inner periphery of the valve hole And a coil spring that is interposed between the valve body and the spring seat and biases the valve body toward the annular valve seat is known (for example, see Patent Document 1). .

  When pressure is applied to the valve hole from the spring seat side, this pressure regulating relief valve closes the valve hole by seating the valve body on the annular valve seat. The body is retracted from the annular valve seat to open the valve hole to allow fluid flow. More specifically, when the damper is actuated and the annular valve seat side of the valve hole faces the pressure chamber on the compression side, the force that pushes the valve element into the valve hole by the pressure in the rising pressure chamber When the urging force of the urging coil spring is overcome, the valve body is separated from the annular valve seat and opened, and the compression-side pressure chamber and the expansion-side pressure chamber are communicated with each other through the valve hole.

  At that time, the valve body moves backward in the direction away from the annular valve seat, and the valve opening area becomes larger as the retraction amount becomes larger. After valve opening (after relief), the pressure is adjusted by the valve opening area. The flow rate of the liquid passing through the relief valve is controlled.

  The damper to which the pressure regulating relief valve is applied includes a constant orifice or a proportional valve arranged in parallel with the pressure regulating relief valve. Therefore, since this damper exhibits a damping force by a constant orifice or a proportional valve until the pressure regulating relief valve is opened, a damping force having a relatively large gain with respect to the expansion / contraction speed is exhibited, and the pressure regulating relief valve is When the valve is opened (relief), a damping force having a relatively small gain is output with respect to an increase in the expansion / contraction speed, and the damping force characteristic (damping force characteristic) with respect to the expansion / contraction speed in this damper is as shown in FIG. It becomes.

JP 2007-71232 A

  However, when the pressure regulating relief valve as described above is applied to a damper that is used for seismic isolation of buildings, it may be pointed out that there are the following problems.

  Here, the seismic isolation device will be described. Generally, in the seismic isolation device, an elastic body such as rubber is interposed between the building and the ground, and the elastic body is attached to the elastic body to absorb the vibration of the building. A damper is installed in parallel.

  The building to which the seismic isolation device is applied is elastically supported by the elastic body, but the mass of the building is very large, so the natural period (the reciprocal of the natural frequency) depends on the mass of the building. However, it is generally as long as about 3 seconds.

  Even if seismic motion acts on a building to which this seismic isolation device is applied, the natural period of seismic motion is shorter than this, and it has been said that the building will not resonate. However, in recent years, it has been found that the frequency components of seismic waves include extremely low frequency components called long-period ground motion. Then, when such a long-period ground motion acts on a building to which a seismic isolation device is applied, the damping force generated by the damper reaches its peak after the conventional pressure regulating relief valve has been relieved, so that the building resonates. As a result, the vibration of the building may not be sufficiently suppressed.

Therefore, the present invention was devised to improve the above-mentioned problems, and the object of the present invention is to be suitable for a shock absorber for building seismic isolation and to suppress vibration of the building in the shock absorber. The object is to provide a pressure regulating relief valve capable of exhibiting an optimum damping force to achieve this and a seismic isolation damper equipped with the pressure regulating relief valve.

In order to solve the above-mentioned object, one problem solving means in the present invention includes a cylindrical housing having a valve hole provided with an annular valve seat, a movably accommodated in the valve hole, and separated from the annular valve seat. A seismic damper is provided with a seating valve body, a spring seat provided in the valve hole, and a spring interposed between the valve body and the spring seat to urge the valve body toward the annular valve seat. In the pressure regulating relief valve to be mounted, it projects into the valve hole from the outer periphery of the housing, and when the retraction amount of the valve body from the annular valve seat reaches a predetermined amount, it collides with the valve body and releases it from the annular valve seat of the valve body. It is characterized in that a stopper for restricting the above retreat is provided.
Similarly, another problem-solving means includes a cylindrical housing having a valve hole provided with an annular valve seat, a valve body movably accommodated in the valve hole and seated on and off from the annular valve seat, and a valve hole. A pressure regulating relief valve having a provided spring seat and a spring interposed between the valve body and the spring seat to bias the valve body toward the annular valve seat, and is controlled until the pressure regulating relief valve is opened In a seismic isolation damper having a constant orifice or a proportional valve that exhibits a damping force, the pressure regulating relief valve protrudes into the valve hole from the outer periphery of the housing and has a retraction amount from the annular valve seat of the valve element. A stopper is provided for restricting further retreat from the annular valve seat of the valve body when it comes to a fixed amount.

According to the pressure regulating relief valve of the present invention, the greater the pressure acting on the tip side of the valve body, the greater the amount of retreat to the inside of the valve hole away from the annular valve seat. When the retraction amount reaches a predetermined retraction amount, the valve body collides with a stopper protruding into the valve hole on the back side of the valve body so that the movement of the valve body in the direction away from the annular valve seat is restricted. It has become. That is, the valve body is restricted from further retreating from the annular valve seat by the stopper.
In addition, the damper equipped with the pressure regulating relief valve of the present invention has a damping coefficient that increases when the piston speed exceeds a predetermined speed, and exerts a larger damping force to suppress vibration. When used in seismic applications, if a building that is elastically supported is vibrated with a large amplitude due to vibration caused by long-period ground motion, it exerts a large damping force on the vibration and the vibration of the building is effective. Can be attenuated.

  In addition, a damper equipped with a pressure regulating relief valve exhibits a damping force with a relatively small damping coefficient with respect to the piston speed when the piston speed is equal to or lower than a predetermined speed, as in the case of a conventional damper for seismic isolation. When there is no vibration excitation due to long-period ground motion, the damping force is not excessive, and the elastic body effectively attenuates the vibration without interfering with the insulation of the vibration from the ground to the building. Can do.

  Therefore, the pressure regulating relief valve can cause the damper to exhibit an optimum damping force for suppressing the vibration of the building, and is optimal for a damper for a building for seismic isolation.

It is a longitudinal cross-sectional view of the pressure regulation relief valve in one Embodiment. It is the schematic of the damper for seismic isolation to which the pressure regulation relief valve of one embodiment is applied. It is a longitudinal cross-sectional view of the pressure regulation relief valve in the modification of one Embodiment. It is the figure which showed the damping force characteristic of the damper for seismic isolation to which the pressure regulation relief valve of one embodiment was applied. It is the figure which showed the damping-force characteristic of the seismic isolation damper to which the conventional pressure regulation relief valve was applied.

  Hereinafter, the pressure regulating relief valve 1 of the present invention will be described with reference to the drawings. As shown in FIG. 1, a pressure regulating relief valve 1 according to an embodiment includes a cylindrical housing 2 having a valve hole 3 having an annular valve seat 4, and a ring housing that is movably accommodated in the valve hole 3. A valve body 5 that is attached to and detached from the valve seat 4, a spring seat 10 provided in the valve hole 3, and a valve body 5 that is interposed between the valve body 5 and the spring seat 10 and that faces the annular valve seat 4. A coil spring 14 as a spring to be energized and a stopper 16 for restricting the valve body from retreating from the annular valve seat 4 are provided.

  And this pressure regulation relief valve 1 is provided in the middle of the channel | paths 20a and 20b which connect the pressure chambers R1 and R2 provided in the inside of the damper D as shown, for example in FIG. The damper D is interposed between the ground G and the building W, and constitutes a seismic isolation device in cooperation with the elastic body S interposed between the ground G and the building W. doing. More specifically, the damper D includes a cylinder 21 and a piston 22 that is slidably inserted into the cylinder 21 and that defines two pressure chambers R1 and R2 into which the cylinder 21 is filled with liquid such as hydraulic oil. The piston rod 23 is movably inserted into the cylinder 21 and connected to the piston 22. In this case, the damper D is a double rod type damper. Of course, it may be a single rod type damper.

  The piston 22 is provided with passages 20a and 20b, and one pressure regulating relief valve 1 is installed in the passages 20a and 20b in different directions. In the damper D, when the piston 22 tries to move to the left in FIG. 2, the pressure in the left pressure chamber R <b> 1 in the figure rises, and the pressure is reduced by the pressure regulating relief valve 1. When the relief pressure is reached, the pressure-regulating relief valve 1 installed in the middle of the passage 20a opens to allow the fluid in the pressure chamber R1 to escape to the pressure chamber R2 on the right side in the figure, thereby resisting the liquid flow and damping. Demonstrate power. In addition, the pressure regulating relief valve 1 installed in the middle of the passage 20b receives the pressure of the pressure chamber R1 and remains closed, thereby blocking the passage 20b. On the contrary, when the piston 22 tries to move to the right in FIG. 2, when the pressure in the right pressure chamber R <b> 2 in the drawing increases and the pressure reaches the relief pressure of the pressure regulating relief valve 1, The pressure regulating relief valve 1 installed in the middle of 20b opens to release the fluid in the pressure chamber R2 to the pressure chamber R1 on the left side in the figure, thereby giving resistance to the flow of the liquid and exerting a damping force. The pressure regulating relief valve 1 installed in the middle of the passage 20a remains closed by receiving the pressure of the pressure chamber R2, and shuts off the passage 20a.

  The damper D includes a constant orifice 24 that communicates the pressure chamber R1 and the pressure chamber R2 in parallel with the passages 20a and 20b, and the fluid remains constant until the pressure regulating relief valve 1 is opened. 24, the pressure chambers R1 and R2 are moved back and forth.

  Thus, the pressure regulating relief valve 1 acts as a damping valve that causes the damper D to exhibit a damping force when vibration is input to the damper D. The configuration of the damper D is not limited to the above. For example, the damper D is a single rod type and includes a reservoir tank in addition to the pressure chamber R1 and the pressure chamber R2. When the damper D is a uniflow damper that circulates fluid in the order of the reservoir R, the pressure chamber R2, the pressure chamber R1, and the reservoir tank when expanding and contracting, the pressure regulating relief valve 1 communicates with the pressure chamber R1 and the reservoir tank. The passage may be installed so as to provide resistance when fluid flows from the pressure chamber R1 toward the reservoir tank. Further, when the damper D is also provided with a reservoir tank in addition to the pressure chamber R1 and the pressure chamber R2, a passage communicating the reservoir tank and the pressure chamber R1 (R2) in addition to the passage provided in the piston. The pressure regulating relief valve 1 may be provided in the middle of the operation. In any case, the pressure regulating relief valve 1 may be installed so that the damper D can exert a damping force.

  Returning to the following, each part of the pressure regulating relief valve 1 will be described in detail. The housing 2 has a cylindrical shape and is provided with a valve hole 3 in which the valve body 5 is accommodated. The inner diameter of the lower end of the valve hole 3 in FIG. 1 is reduced to form a reduced diameter portion 3a. An annular valve seat 4 is formed by a step portion provided by forming the reduced diameter portion 3a. Further, a screw portion 3b is provided on the inner periphery of the upper end in FIG. 1 of the valve hole 3, and an annular nut 15 is screwed to the screw portion 3b.

  Further, the housing 2 has a plurality of screw holes 9 which are opened from the side thereof and communicate with the valve hole 3 in the same radial direction. The screw holes 9 are screwed from the outside of the housing 2. A screw-like stopper 16 to be screwed in is screwed, and the base end of the stopper 16 does not protrude from the outer periphery of the housing 2, but the distal end protrudes into the valve hole 3. Note that a simple hole may be provided in the housing 2 instead of the screw hole 9, and a pin-shaped stopper may be press-fitted into the hole and fixed.

  The valve body 5 is accommodated in the valve hole 3 so as to be movable in the axial direction, and is formed at a disc-shaped valve body 6 that is attached to and detached from the annular valve seat 4 and at the lower end in FIG. The cylindrical valve head 7 and a spring fitting portion 8 that protrudes toward the valve head side of the valve body 6 are provided. The valve head 7 is slidably inserted into the reduced diameter portion 3 a of the valve hole 3, and the valve body 5 is pivoted without being displaced by the reduced diameter portion 3 a of the valve hole 3 using the valve head 7 as a guide. It can move in the direction. The movement of the valve body 5 may be guided by sliding the outer periphery of the valve body 6 against the inner peripheral surface of the valve hole 3, and in that case, the hole or the outer periphery of the valve body 6 extends in the axial direction. A cutout or the like may be provided so as to allow passage of fluid.

  When the lower end of the valve body 6 in FIG. 1 is brought into contact with the upper surface of the annular valve seat 4 in FIG. 1 and is seated, the pressure regulating relief valve 1 is closed and the flow of fluid into the valve hole 3 is blocked. Can be done. Further, a U-shaped groove 7a is formed in the valve head 7 from the distal end to the proximal end, and the lower end of the valve body 6 in FIG. 1 is from the upper surface in FIG. When retreating to the inside of the valve hole 3, the groove 7 a opens from the reduced diameter portion 3 a to the inside of the valve hole 3 according to the retraction amount, and fluid flows into the valve hole 3 through the groove 7 a. Can be done. And according to the retraction amount of the valve body 6 in this valve body 5, the area which the groove | channel 7a faces in the valve hole 3 becomes large, and the valve opening area increases. Note that the shape of the valve head 7 is not limited to the above, and in particular, the valve head 7 may not function as a guide for the movement of the valve body 5.

  In addition to the valve body 5, a spring seat 10 is accommodated in the valve hole 3 described above. The spring seat 10 includes a columnar spring fitting portion 11 and a spring fitting portion 11 in FIG. 1. A flange-shaped spring receiving portion 12 provided at the middle and upper ends and a through hole 13 communicating from the upper end to the lower end of the spring fitting portion 11 are provided.

  The spring seat 10 is prevented from slipping out of the valve hole 3 by an annular nut 15 screwed into the screw portion 3b of the valve hole 3, and movement in a direction away from the annular valve seat 4 is restricted. ing.

  A coil spring 14 is interposed between the spring seat 10 and the valve body 5 in a compressed state, and the movement of the spring seat 10 in the direction away from the annular valve seat 4 is restricted by the nut 15 described above. Therefore, the urging force of the compressed coil spring 14 acts on the valve body 5 toward the annular valve seat 4. Therefore, in this pressure regulating relief valve 1, the force that pushes the valve body 5 upward in FIG. 1 by the pressure acting on the valve head 7 of the valve body 5 from the outside of the housing 2 causes the valve body 5 of the coil spring 14 to move in FIG. The valve closing state is maintained until the urging force that pushes downward is overcome, and when the force overcomes the urging force of the coil spring 14, the valve body 5 pushes and contracts the coil spring 14 so that the valve body 5 moves backward and opens. It has become. That is, in the pressure regulating relief valve 1, the relief pressure (valve opening pressure) is set by the urging force generated by the coil spring 14 in the closed state. As described above, when the pressure regulating relief valve 1 is opened, the fluid that has pushed the valve body 5 and passed through the groove 7a passes through the valve hole 3, the through hole 13 of the spring seat 10, and the inner periphery of the nut 15, and the housing. 2 will come off to the back side.

  The valve body 5 is further away from the annular valve seat 4 as the pressure acting on the tip side increases, and the amount of retreat to the inside of the valve hole 3 increases. However, the retreat amount from the annular valve seat 4 is a predetermined amount. When the retraction amount is reached, the valve body 6 is abutted against a plurality of stoppers 16 protruding into the valve hole 3 on the back side, and the valve body 5 is restricted from moving further away from the annular valve seat 4. It is like that. That is, the valve body 5 is restricted from further retreating from the annular valve seat 4 by the stopper 16.

  Returning, the coil spring 14 is fitted with a spring fitting portion 8 of the valve body 5 on the inner periphery of the lower end in FIG. 1 as one end thereof, and on the inner periphery of the upper end in FIG. The spring fitting portion 11 of the seat 10 is fitted, and the spring seat 10 loosely fitted in the valve hole 3 is aligned in the valve hole 3. In this case, since the outer periphery of the spring receiving portion 12 in the spring seat 10 faces the screw portion 3b in the valve hole 3, the spring seat 10 is aligned with the coil spring 14 as described above. When the receiving portion 12 faces the portion other than the screw portion 3 b of the valve hole 3, the outer periphery of the spring receiving portion 12 is brought into contact with the inner periphery of the valve hole 3 so that the spring seat 10 is aligned with the valve hole 3. May be.

  The stopper 16 basically protrudes into the valve hole 3 so that its tip does not interfere with the outer periphery of the coil spring 14, but the outer diameter is set larger than the wire spacing of the coil spring 14. In this case, even if the stopper 16 is loosened and enters the inside of the valve hole 3, it is possible to prevent the coil spring 14 from entering further inside the valve hole 3. It is possible to prevent 16 from completely entering the valve hole 3 to prevent the movement of the valve body 5 or to be sandwiched between the wire members of the coil spring 14 to prevent the coil spring 14 from being compressed. Further, as shown in FIG. 3, the valve body 6 is opposed to the tip of the stopper 16 on the back side to prevent the stopper 16 from entering the valve hole 3 and has a smaller diameter than the valve body 6 and is fitted with a spring. If a seat portion 6a having a larger diameter than the joint portion 8 and on which one end of the coil spring 14 sits is provided, the above-described place can be obtained without setting the outer diameter of the stopper 16 to be equal to or larger than the wire rod interval of the coil spring 14. Similar effects can be obtained.

  As described above, the pressure regulating relief valve 1 configured in this way is formed into a cartridge by integrating all the structural members into the housing 2. For example, as described above, the passage 20 a provided in the piston 22 of the damper D is provided. , 20b and the like are fixed. Specifically, the passages 20a and 20b are formed by providing holes in the piston 22, and the pressure regulating relief valve 1 formed into a cartridge as described above is inserted into the holes forming the passages 20a and 20b. The pressure regulating relief valve 1 is fixed to the passages 20a and 20b by screwing an annular nut into the hole. Then, the stopper 16 screwed into the housing 2 is restricted from moving outside the housing 2 by the holes forming the passages 20a and 20b, so that the stopper 16 does not fall out of the housing 2.

  Next, the operation of the pressure regulating relief valve 1 will be described by taking as an example the case where it is installed in the passage 20a of the damper D. In the pressure regulating relief valve 1 configured as described above, when a leftward external force in FIG. 2 acts on the piston 22, the pressure in the left pressure chamber R1 in the figure increases. However, until the pressure reaches the relief pressure, the pressure regulating relief valve 1 does not open, so that the fluid moves from the pressure chamber R1 to the pressure chamber R2 only through the constant orifice 24. Therefore, the damping force characteristic that is the characteristic of the damping force with respect to the piston speed of the damper D until the pressure regulating relief valve 1 is opened becomes a square characteristic peculiar to the orifice as shown in the section A in FIG. Exhibits a damping force with a relatively high damping coefficient with respect to the piston speed.

  When the moving speed of the piston 22 increases, the pressure in the left pressure chamber R1 in the figure increases and the pressure reaches the relief pressure of the pressure regulating relief valve 1, as described above, the valve body 5 The coil spring 14 is compressed by being pressed by the pressure, and is retracted away from the annular valve seat 4 to open the passage 20a. When the pressure regulating relief valve 1 is opened, the fluid in the left pressure chamber R1 to be compressed flows into the valve hole 3 and escapes to the back surface of the housing 2 through the through hole 13, and is expanded to the right. It moves to the pressure chamber R2. The damper D applies a resistance to the fluid flow by the pressure regulating relief valve 1 against the leftward movement of the piston 22 and generates a damping force that suppresses the movement of the piston 22. At that time, the resistance at the constant orifice 24 is larger than that of the pressure regulating relief valve 1 and the flow rate flowing through this is small, and the damping force characteristic of the damper D is dominated by the characteristic of the pressure regulating relief valve 1. .

  The moving speed of the piston 22 to the left does not reach a predetermined moving speed, and the pressure in the pressure chamber R1 acting on the valve body 5 cannot be retracted until the valve body 5 abuts against the stopper 16. In the state, the valve body 5 can be moved away from the annular valve seat 4 in accordance with the pressure increase in the pressure chamber R1 due to the increase of the piston speed, and the valve opening area can be increased. As shown in FIG. 5, the damping force characteristic that increases the damping force with a relatively small inclination with respect to the increase in the piston speed is exhibited.

  In the pressure regulating relief valve 1, when the fluid passes between the valve body 5 and the annular valve seat 4, not only resistance is given to the flow of the fluid but also the fluid passes through the through-hole 13. When passing, resistance is given to the flow of the fluid. Therefore, when the fluid that has passed between the valve body 5 and the annular valve seat 4 passes through the through-hole 13, the pressure in the valve hole 3 rises, and this pressure is used as a secondary pressure on the back surface of the valve body 5. The valve body 5 can be urged toward the annular valve seat 4 in the valve closing direction by acting on the upper surface side in FIG. Thus, the secondary pressure can be arbitrarily set according to the opening area of the through-hole 13, and the opening area of the through-hole 13 characterizes the damping force characteristic of the damper D after the pressure regulating relief valve 1 is opened. It is an adjustment factor.

  Subsequently, the moving speed of the piston 22 to the left (the expansion / contraction speed of the damper D) reaches a predetermined speed, the pressure in the pressure chamber R1 acting on the valve body 5 increases, and the valve body 5 is pushed against the stopper 16. Since the valve body 5 is prevented from moving away from the annular valve seat 4 by the stopper 16, no matter how much the pressure in the pressure chamber R <b> 1 increases due to the subsequent increase in the piston speed, the valve body 5 is prevented from moving away from the annular valve seat 4. The valve opening area cannot be increased any further, and the damper D exhibits a damping force characteristic that increases the damping force with a relatively large inclination with respect to the increase of the piston speed, as shown in a section C in FIG. To do. The operation of the pressure regulating relief valve 1 installed in the passage 20b of the damper D exhibits the same operation as described above when the moving direction of the piston 22 is opposite to the above, and thus detailed description is omitted. To do.

  In this way, the damper D equipped with the pressure regulating relief valve 1 has a damping coefficient that increases when the piston speed exceeds a predetermined speed, and exhibits a larger damping force to suppress vibration. When used in seismic control applications, when a building W that is elastically supported is vibrated with a large amplitude due to vibration excitation due to long-period ground motion, it exerts a large damping force against the vibration of the building. Can be effectively attenuated.

  Further, the damper D equipped with the pressure regulating relief valve 1 exhibits a damping force with a relatively small damping coefficient with respect to the piston speed when the piston speed is equal to or lower than the predetermined speed, as in the case of a conventional damper for seismic isolation. Therefore, when there is no vibration excitation due to long-period ground motion, the damping force is not excessive, and the elastic body S is effective without interfering with the insulation of the vibration due to the earthquake from the ground G side to the building W. Vibration can be damped.

  Therefore, the pressure regulating relief valve 1 can cause the damper D to exhibit the optimum damping force for suppressing the vibration of the building W, and is optimal for the damper D for the seismic isolation application of the building W. Become.

  The predetermined speed of the damper D when the stopper 16 abuts the valve body 5 and restricts the backward movement of the valve body 5 from the annular valve seat 4 can be arbitrarily set. For example, the expansion / contraction speed expected to be reached when the building W resonates due to long-period ground motion is set. Further, when the predetermined speed is reached, the stopper 16 may abut against the valve body 5 to restrict the backward movement of the valve body 5 from the annular valve seat 4. What is necessary is just to set the predetermined reverse amount at the time of hitting 5 according to predetermined speed.

 Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the details shown or described.

  The present invention is applicable to a pressure regulating relief valve for a damper.

DESCRIPTION OF SYMBOLS 1 Pressure regulation relief valve 2 Housing 3 Valve hole 3a Diameter reduction part 3b in valve hole Screw part 4 in valve hole 4 Annular valve seat 5 Valve body 6 Valve body 6a Seat part 7 Valve head 8 Spring fitting part 9 in valve body Screw hole DESCRIPTION OF SYMBOLS 10 Spring seat 11 Spring fitting part 12 in a spring seat Spring receiving part 13 in a spring seat Through hole 14 Coil spring 15 Nut 16 Stopper 20a, 20b Passage 21 Cylinder 22 Piston 23 Piston rod 24 Constant orifice D Damper G Ground R1, R2 Pressure Chamber S Elastic body W Building

Claims (6)

A cylindrical housing having a valve hole with an annular valve seat, a valve body movably accommodated in the valve hole and seated on and off the annular valve seat, a spring seat provided in the valve hole, a valve body and a spring In a pressure regulating relief valve mounted on a seismic isolation damper, provided with a spring interposed between the seat and urging the valve body toward the annular valve seat, the valve projects from the outer periphery of the housing into the valve hole. A pressure regulating relief valve, comprising a stopper that abuts the valve body when the retraction amount of the valve body from the annular valve seat reaches a predetermined amount and restricts further retreat of the valve body from the annular valve seat.
2. The pressure regulating relief valve according to claim 1, wherein when the expansion / contraction speed of the damper reaches a predetermined speed, the stopper restricts the valve element from retreating from the annular valve seat.
  The said predetermined speed is set to the expansion-contraction speed of the said damper expected when it reaches | attains when the building in which the said pressure regulation relief valve is installed resonates by a long-period ground motion. Pressure regulating relief valve.
  4. The pressure regulating relief valve according to claim 1, wherein the spring is a coil spring, and the stopper has an outer diameter set larger than an interval between the wire rods of the spring.
  The pressure regulating relief valve according to claim 1, 2 or 3, wherein the valve body includes a seat portion that faces the tip of the stopper and prevents the stopper from entering the valve hole.
  A cylindrical housing having a valve hole with an annular valve seat, a valve body movably accommodated in the valve hole and seated on and off the annular valve seat, a spring seat provided in the valve hole, a valve body and a spring A pressure regulating relief valve provided with a spring interposed between the seat and biasing the valve body toward the annular valve seat;
In a seismic isolation damper having a constant orifice or a proportional valve that exerts a damping force predominantly until the pressure regulating relief valve is opened,
  The pressure regulating relief valve protrudes from the outer periphery of the housing into the valve hole, and when the retracted amount of the valve body from the annular valve seat reaches a predetermined amount, it collides with the valve body and further retracts from the annular valve seat of the valve body. A seismic isolation damper characterized by having a stopper to regulate the vibration.

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