TW202311658A - Pressure reducing valve and manufacturing method therefor - Google Patents

Abstract

Provided are: a pressure reducing valve that is made of a synthetic resin and that can be easily dimensionally managed; and a manufacturing method therefor. A pressure reducing valve 1 according to the present invention comprises: a housing 2 having an inlet 2a and an outlet 2b and allowing a fluid flowing in through the inlet 2a to pass through the inside and flow out through the outlet 2b; a valve body 3 movably housed in the housing 2; a valve seat 4 installed in the housing 2; and a biasing member 5 that biases the valve body 3 in a direction away from the valve seat 4. The pressure reducing valve is configured such that an increase in pressure of the fluid at the outlet causes the valve body 3 to abut against the valve seat 4 countering a biasing force of the biasing member 5, thereby enabling cutting-off of flowing of the fluid in the housing 2. The housing 2 is provided with a housing body 21 and a cap 22, and the cap 22 is welded to a synthetic resin member (valve seat frame body 41).

Description

Pressure reducing valve and manufacturing method thereof

The present invention relates to a pressure reducing valve and a method of manufacturing the same.

Conventionally, there is known a pressure reducing valve, which is installed in the flow path leading to sprinklers such as sprinklers. When the pressure on the downstream side rises, the opening is reduced to reduce the pressure on the downstream side, and the pressure on the downstream side is reduced. Adjust to an appropriate pressure (for example, refer to Patent Document 1). [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-320723

[Problem to be Solved by the Invention]

Usually, the pressure reducing valve has a casing, and the casing has a cylindrical casing body and a cover for preventing parts in the casing body from falling off. Among them, regarding the pressure reducing valve, due to the uneven size of the parts fixed between the housing body and the cover, the size of each pressure reducing valve is uneven, and the size of each pressure reducing valve is different. In conventional pressure reducing valves, in order to prevent such a situation, a part of the metal valve seat frame constituting a part of the valve seat is flattened to adjust the size of the pressure reducing valve.

However, when the pressure reducing valve is made of synthetic resin, a part of the valve seat frame cannot be crushed, and size management of the pressure reducing valve becomes difficult.

In view of the above circumstances, an object of the present invention is to provide a pressure reducing valve made of synthetic resin that is easy to manage in size and a manufacturing method thereof. [Technical means to solve the problem]

[1] In order to achieve the above object, the pressure reducing valve of the present invention (for example, the pressure reducing valve 1 of the embodiment. The same applies below) has: A synthetic resin casing (for example, the casing 2 of the embodiment. The same applies below), which has an inlet and an outlet, and the fluid flowing in from the inlet can flow out from the outlet through the interior; A valve body (for example, the valve body 3 of the embodiment. The same applies hereinafter), which is movably housed in the housing; A valve seat (for example, the valve seat 4 of the embodiment. The same applies below), which is arranged in the above-mentioned housing; and an urging member (for example, the urging member 5 of the embodiment; hereinafter the same), which urges the valve body in a direction away from the valve seat, and The above-mentioned pressure reducing valve can make the above-mentioned valve body resist the elastic force of the above-mentioned elastic member and abut against the above-mentioned valve seat to block the flow of the fluid in the above-mentioned casing by the pressure of the fluid at the above-mentioned outflow port rising, The pressure reducing valve of the present invention is characterized in that: The housing includes a housing body (for example, the housing body 21 of the embodiment. The same applies below) and a cover (for example, the cover 22 of the embodiment. The same applies below), A synthetic resin member (for example, the valve seat frame 41 of the embodiment; the same applies hereinafter) is arranged to be sandwiched between the above-mentioned case body and the above-mentioned cover, and The said cover is welded to the said synthetic resin member.

[5] Also, in the manufacturing method of the pressure reducing valve of the present invention, the pressure reducing valve has: The casing has an inlet and an outlet, and the fluid flowing in from the inlet can flow out from the outlet through the interior; a valve body, which is movably housed in the housing; a valve seat disposed within said housing; and an elastic member that elastically presses the valve body in a direction away from the valve seat, and The above-mentioned pressure reducing valve can make the above-mentioned valve body resist the elastic force of the above-mentioned elastic member and abut against the above-mentioned valve seat to block the flow of the fluid in the above-mentioned casing by the pressure of the fluid at the above-mentioned outflow port rising, The manufacturing method of the pressure reducing valve of the present invention is characterized in that: The housing includes a housing body and a cover, The synthetic resin member is disposed so as to be sandwiched between the case body and the cover, and The abutting portion between the lid and the synthetic resin member was oscillated with ultrasonic waves to melt.

According to the present invention, it is possible to adjust the size of the pressure reducing valve by adjusting the amount of welding between the cap and the synthetic resin member, or the amount of fusion between the contact portion between the cap and the synthetic resin member. Therefore, even a pressure reducing valve made of synthetic resin can be adjusted in size without crushing a part of the valve seat like a pressure reducing valve made of metal, and the size control of the pressure reducing valve can be easily performed.

[2] [6] Also, in the pressure reducing valve of the present invention or its manufacturing method, The valve seat includes a sheet member (for example, the O-ring 42 of the embodiment, the same below) that can be in contact with the valve body, and a seat frame that holds the sheet member (for example, the valve seat frame of the embodiment 41. The same below), The above-mentioned valve seat frame may be the above-mentioned synthetic resin member.

According to this configuration, since the valve seat frame constituting the valve seat can be used as the synthetic resin member for size adjustment, an increase in the number of parts of the pressure reducing valve can be suppressed.

[3] In addition, in the pressure reducing valve of the present invention, the above-mentioned cover or the above-mentioned synthetic resin member has a protrusion for size adjustment, The above-mentioned cover and the above-mentioned synthetic resin member can be welded by fusing the above-mentioned protrusion for size adjustment.

[7] In addition, in the method for manufacturing a pressure reducing valve of the present invention, the cover or the synthetic resin member has a dimension adjustment protrusion on the contact portion, The above-mentioned size-adjusting protrusions can be melted by vibrating the above-mentioned cap with ultrasonic waves.

According to this configuration, the size of the pressure reducing valve can be adjusted by melting the size adjustment protrusion. In addition, the size-adjusting protrusion has a convex shape. According to this shape, the size-adjusting protrusion can be melted more positively than the contact portion with the counterpart, and the size adjustment of the pressure reducing valve can be easily performed.

[4] [8] Also, in the pressure reducing valve of the present invention or its manufacturing method, either the above-mentioned cap on which the above-mentioned dimension adjustment protrusions are formed or the above-mentioned synthetic resin can be made of a material that is more easily melted than the other. form.

According to this configuration, since the size adjustment protrusion can be melted more actively, the size adjustment of the pressure reducing valve can be performed more easily.

[9] Also, in the method of manufacturing the pressure reducing valve of the present invention, after starting the ultrasonic welding of the housing body and the cover, the melting of the abutting portion between the cover and the synthetic resin member may be started.

According to this structure, since the welding margin of a case main body and a cover can be ensured, it becomes easy to ensure the joint strength of a case main body and a cover.

A pressure reducing valve 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 9 . Referring to Fig. 1 and Fig. 2, the pressure reducing valve 1 of the first embodiment includes: a casing 2, which has an inlet 2a and an outlet 2b, and is made of synthetic resin and is cylindrical; The direction is slidably arranged in the casing 2 and is made of synthetic resin and has a cylindrical shape; the valve seat 4 is in contact with or separated from the valve body 3; The direction springs against the valve body 3; the spring seat 6 supports one end of the spring pressing member 5; and the retainer 7 is stacked on the spring seat 6. Hereinafter, for convenience of description, the top and bottom of the pressure reducing valve 1 shown in Fig. 1 and Fig. 2 are simply referred to as "upper" and "lower".

The housing 2 is equipped with: a housing body 21 with an upper opening, a bottom 21e having a through hole 21a that becomes the outlet 2b, and having a bottomed cylindrical shape; The valve seat 4 , the spring seat 6 , and the retainer 7 are fixed in the housing 2 together with the housing body 21 . The cover 22 is formed with an opening serving as an inlet 2a through which fluid can flow into the case 2 . A female thread is provided on the inner peripheral surface of the inflow port 2a provided with the opening of the cover 22 .

A small-diameter portion 21b and a large-diameter portion 21c having a larger diameter than the smaller-diameter portion 21b are formed on the inner peripheral surface of the housing body 21 from the bottom 21e side. An annular step portion 21d is formed at the boundary between the small diameter portion 21b and the large diameter portion 21c. Male threads are formed on the outer peripheral surface of the bottom 21 e side of the housing body 21 . The outer diameter of the male thread portion 21g formed with the male thread is smaller than the outer diameter of other parts of the housing body 21, and an annular outer peripheral step is formed between the male thread portion 21b and other parts of the outer peripheral surface of the housing body 21. Section 21h. In the pressure reducing valve 1, the dimension x from the outer peripheral step portion 21h to the upper end of the cover 22 is adjusted so as to be a predetermined arbitrary dimension (predetermined dimension).

The cover 22 is ultrasonically welded to the housing body 21 . Also, referring to FIG. 3 , ribs 22 a protruding radially outward are disposed on the outer peripheral surface of the cover 22 at intervals along the circumferential direction. Each rib 22 a extends along the direction in which the cover 22 is inserted into the housing body 21 . Also, referring to FIG. 4 , the large-diameter portion 21c of the housing body 21 is provided with several groove portions 21f allowing the passage of the rib portion 22a.

Referring to Fig. 1 and Fig. 2, an annular spring seat 6, an annular retainer 7, and a valve are stacked sequentially from the side of the step portion 21d on the step portion 21d to which the upper end (one end) of the elastic member 5 abuts. Seat 4. Furthermore, the spring seat 6 , the retainer 7 , and the valve seat 4 are interposed and fixed between the step portion 21 d and the cover 22 . A cylindrical portion 31 , which will be described later, of the valve body 3 is inserted into the central portion of the spring seat 6 and the retainer 7 so as to be able to move freely in the axial direction. Elastic ring-shaped sealing members 6 a and 6 b are provided on the inner and outer circumferences of the spring seat 6 . The sealing member 6 a on the inner peripheral side seals liquid-tightly between the spring seat 6 and the cylindrical portion 31 of the valve body 3 . The sealing member 6 b on the outer peripheral side seals the space between the spring seat 6 and the housing 2 in a liquid-tight manner. The holder 7 presses the sealing members 6a, 6b from above.

The valve body 3 includes: a cylindrical portion 31 having a circular cross section; a protruding portion 32 protruding radially outward from the central portion of the cylindrical portion 31; The fitting groove of the edge, and liquid-tightly sealing between the small-diameter portion 21b of the housing 2 and the protruding portion 32, is an elastic body and has a ring shape. The cylindrical portion 31 of the valve body 3 is inserted through the center portion of the spring seat 6 and the retainer 7 , and the upper end (front end) of the cylindrical portion 31 faces an O-ring 42 described later on the valve seat 4 .

The valve seat 4 includes a synthetic resin valve seat frame 41 , an O-ring 42 as a sheet member, and a synthetic resin cover member 43 . The valve seat frame 41 has: an outer ring portion 41a, which is annular; an inner ring portion 41b, which is disposed inside the outer ring portion 41a with a gap; and a bridge portion 41c, which connects the outer ring portion 41a with a gap. Inner ring part 41b. The outer peripheral portion of the outer ring portion 41 a is pressed by the cover 22 from above.

The cover member 43 is provided with: a closing plate portion 43a, which closes the upper edge of the inner ring portion 41b; an inner peripheral portion 43b, which hangs down from the center of the closing plate portion 43a, and extends through a hole in the center of the O-ring 42; The falling-off preventing portion 43c is disposed at the lower end of the inner peripheral portion 43b and has a larger diameter than the inner peripheral portion 43b to prevent the O-ring 42 from falling off from the inner ring portion 41b. The closing plate portion 43a is ultrasonically welded to the upper edge of the inner ring portion 41b. At the lower end of the inner ring part 41b, a second anti-falling part (not marked) protruding to the inner peripheral side is provided. The O-ring 42 is connected to the valve body 3 by the first anti-falling part 43c and the second anti-falling part. The exposed state of the abutting portion is maintained on the valve seat frame 41 .

Next, the operation of the pressure reducing valve 1 of this embodiment will be described. Regarding the pressure reducing valve 1 of this embodiment, as shown by the dot chain line in FIG. 1 , fluid (eg, water or hot water, etc.) passes through the pressure reducing valve 1 from top to bottom. The force pushing upward by the pressure on the outlet 2b side acts on the valve body 3 . And, when the pressure on the side of the outlet 2b rises, the valve body 3 moves upward against the biasing force of the biasing member 5, the gap between the valve body 3 and the valve seat 4 becomes narrow, and the pressure loss when the fluid passes through the gap becomes smaller. big. Thereby, the pressure on the side of the outflow port 2b decreases, and the flow rate of the fluid passing through the pressure reducing valve 1 decreases. The valve body 3 is at rest at a position where the upward force of the pressure on the outlet 2b side and the downward force of the biasing member 5 are balanced. Furthermore, when the pressure on the side of the outlet 2b exceeds a predetermined value, as shown in FIG. 2 , the upper edge of the valve body 3 abuts against the O-ring 42 to prevent the flow of fluid in the pressure reducing valve 1 .

Next, a method of manufacturing the pressure reducing valve 1 according to the first embodiment will be described.

The pressure reducing valve 1 has a first welded portion 10 as the welded portion between the cover 22 and the housing body 21 , and a second welded portion 11 as the welded portion between the cover 22 and the valve seat frame 41 . The first welded portion 10 and the second welded portion 11 are bonded by ultrasonic welding. In the first embodiment, the material of the cover 22 and the housing body 21 is POM (polyoxymethylene) resin. The material of the valve seat frame 41 is PPS (polyphenylene sulfide) resin, and the cover 22 is a material that is easier to melt than the valve seat frame 41 .

The first welding portion 10 is located on the inner periphery of the upper end of the housing body 21 . Referring to FIG. 5 , in the state before welding, a tapered surface 9 that gradually expands upward is formed on the inner periphery of the upper end of the housing body 21 that becomes the first welding portion 10 . Moreover, in the state before welding, the ring-shaped corner part 22b is formed in the outer periphery of the cover 22 used as the 1st welding part 10. As shown in FIG. The corner portion 22b is in contact with the tapered surface 9 from above.

The second welding portion 11 is located at the upper end of the outer peripheral portion of the outer ring portion 41 a of the valve seat frame 41 . Referring to FIG. 5 , in a state before welding, an annular flat surface 41 g facing upward is formed on the outer peripheral portion of the outer ring portion 41 a. Moreover, in the state before welding, the ring-shaped protrusion 8 for dimension adjustment which protrudes downward is provided in the cover 22 which becomes the 2nd welding part 11. As shown in FIG. The front end of the dimension adjustment protrusion 8 abuts on the flat surface 41g from above. The protrusion 8 for dimension adjustment is a portion melted to adjust the dimension x of the pressure reducing valve 1 to a predetermined dimension, and may be completely melted and disappeared in some cases.

Thus, the corner part 22b of the cover 22 and the protrusion 8 for size adjustment abut each of the tapered surface 9 and the flat surface 41g from above. For their abutting portions, when a downward force is applied to the cover 22, pressurization can be performed simultaneously.

When starting the step before welding of the pressure reducing valve 1, as shown in FIG. 7. And the valve seat 4, and cover the cover 22 from it. In this state, the spring seat 6 , the retainer 7 , and the valve seat 4 are pushed up by the biasing member 5 , so that the dimension adjustment protrusion 8 of the cover 21 abuts against the flat surface 41 g of the valve seat frame 41 .

In the pre-welding step, downward force is applied to the cover 22 to compress the pressing member 5 and press the cover 22 into the lower part of the housing body 21 . When performing the welding preparatory step, as shown in FIG. 6 , the corner portion 22 b of the cover 22 abuts against the tapered surface 9 and moves to the first step of welding.

In the first step of welding, downward force is applied to the lid 22 and the lid 22 is vibrated with ultrasonic waves. Thereby, the contact part of the corner|angular part 22b of the cover 22 and the taper surface 9 of the case main body 21 is pressurized, and is melt|fused by frictional heat. Thereby, the cover 22 is ultrasonically welded to the housing body 21 to form the first welded portion 10 .

In this first welding step, the spring seat 6 is separated from the step portion 21d. Therefore, the dimension adjustment protrusion 8 of the cover 22 abuts against the flat surface 41g of the valve seat frame 41, but the pressure applied to the abutting portion is generated by the pressing member 5 and is not sufficient to start welding. Therefore, in the first welding step, the cover 22 is not welded to the valve seat frame 41 , but only welded to the housing body 21 . When the first step of welding is performed, as shown in FIG. 7 , the spring seat 6 abuts against the step portion 21d, and moves to the second step of welding.

In the second step of fusing, following the first step of fusing, downward force is applied to the lid 22 and the lid 22 is vibrated with ultrasonic waves. As a result, the welding of the first welding portion 10 is performed, and the contact portion between the dimension adjustment protrusion 8 of the cap 22 and the flat surface 41g of the valve seat frame 41 is pressurized and melted by frictional heat. Thereby, the cover 22 is ultrasonically welded to the valve seat frame 41 to form the second welded portion 11 .

In the second step of welding, the welding of the cover 22 in the first welding part 10 and the housing body 21 and the welding of the cover 22 in the second welding part 11 and the valve seat frame 41 are carried out simultaneously. When the second welding step is performed and the dimension x of the pressure reducing valve 1 becomes a predetermined dimension, the vibration of the cover 22 is stopped. Thereby, the welding step ends, and the pressure reducing valve 1 is completed.

Dimension y of the parts (spring seat 6, retainer 7, and valve seat frame 41) accommodated in the housing 2 and sandwiched between the cover 22 and the step portion 21d in the pressure reducing valve 1 having a predetermined size When it is smaller, as shown in FIG. 8 , the amount of melting of the dimension adjustment protrusion 8 is small. On the other hand, when the size y of the components accommodated in the case 2 and sandwiched between the cover 22 and the step portion 21 is large, as shown in FIG.

As described above, the pressure reducing valve 1 of the first embodiment includes: a synthetic resin casing 2 having an inlet 2a and an outlet 2b, and the fluid flowing in from the inlet 2a can flow out from the outlet 2b through the interior; a valve body 3, It is movably accommodated in the casing 2; the valve seat 4 is arranged in the casing 2; The pressure reducing valve 1 can increase the pressure of the fluid at the outlet 2b, so that the valve body 3 resists the biasing force of the biasing member 5 and abuts against the valve seat 4 to block the flow of the fluid in the casing 2 .

The housing 2 includes a housing body 21 and a cover 22 . The valve seat frame 41 (member made of synthetic resin) is arranged so as to be sandwiched between the case body 21 and the cover 22 . According to the pressure reducing valve 1 of the first embodiment, the cover 22 is welded to the valve seat frame 41 . In addition, according to the method of manufacturing the pressure reducing valve 1 of the first embodiment, the contact portion between the cover 22 and the valve seat frame 41 is oscillated by ultrasonic waves to melt it.

Thereby, the dimension x of the pressure reducing valve 1 can be adjusted by adjusting the welding amount of the cover 22 and the valve seat frame 41 or the melting amount of the contact portion between the cover 22 and the valve seat frame 41 . Therefore, even a pressure reducing valve made of synthetic resin can be adjusted in size without crushing a part of the valve seat as in a pressure reducing valve made of metal, and the size control of the pressure reducing valve 1 can be easily performed.

Furthermore, in the first embodiment, although the dimension x of the pressure reducing valve 1 from the outer peripheral step portion 21h to the upper end of the cover 22 is adjusted to a predetermined size, the size adjustment of the pressure reducing valve of the present invention is not limited to this . For example, the size of the pressure reducing valve adjusted according to the present invention may be the entire length of the pressure reducing valve, as long as it is the dimension in the upper and lower directions (axial direction) of the pressure reducing valve, it can be adjusted. Furthermore, in order to adjust the size, it is only necessary that at least one of the cover 22 or the valve seat frame 41 is melted, and the cover 22 and the valve seat frame 41 do not need to be bonded.

Moreover, according to the pressure reducing valve 1 and its manufacturing method of the first embodiment, the valve seat 4 includes the O-ring 42 (sheet member) capable of contacting the valve body 3 and the valve seat frame 41 holding the O-ring 42 . The valve seat frame 41 is a member made of synthetic resin. Thereby, since the valve seat frame 41 constituting the valve seat 4 can be used as a member made of synthetic resin for size adjustment, an increase in the number of parts of the pressure reducing valve 1 can be suppressed.

In the first embodiment, the valve seat frame 41 is used as a synthetic resin member, but the synthetic resin member of the present invention is not limited to the valve seat frame 41 . For example, the spring seat 6 or the retainer 7 can be used as the synthetic resin member of the present invention, or a gasket, a spacer, etc. can be laminated on the valve seat frame 41 to be the synthetic resin member of the present invention.

Moreover, the cover 22 has the protrusion 8 for size adjustment. Furthermore, in the pressure reducing valve 1 of the first embodiment, the cap 22 is welded to the valve seat frame 41 by melting the size adjustment protrusion 8 . Moreover, according to the manufacturing method of the pressure reducing valve 1 of the first embodiment, the protrusion 8 for size adjustment is melted by vibrating the cap 22 with an ultrasonic wave. According to this configuration, the size of the pressure reducing valve 1 can be adjusted by melting the protrusion 8 for size adjustment. Also, the size adjustment protrusion 8 has a convex shape. According to such a shape, the dimension adjustment protrusion 8 can be actively melted, so that the dimension adjustment of the pressure reducing valve 1 can be easily performed.

In the first embodiment, the protrusion 8 for size adjustment was provided on the cover 22, but the protrusion 8 for size adjustment of the present invention may be provided on a synthetic resin member. In the first embodiment, the size adjustment protrusion 8 is ring-shaped, but the size adjustment protrusion 8 of the present invention is not limited to this, for example, it may be arc-shaped, or may be a plurality of protrusions arranged on the same circumference . Furthermore, as long as the lid or the synthetic resin member can be fused to adjust the size, it is not necessary to have the protrusion for size adjustment.

In addition, the cover 22 on which the dimension adjustment protrusion 8 is formed is formed of a material that is more easily melted than the valve seat frame 41 (synthetic resin member of the valve seat 4). For example, the cover 22 and the case body 21 are made of POM (polyoxymethylene) resin, and the valve seat frame 41 (synthetic resin member of the valve seat 4 ) is made of PPS (polyphenylene sulfide) resin. Thereby, since the protrusion 8 for dimension adjustment can be melted more positively, the dimension adjustment of the pressure reducing valve 1 can be performed easily.

Furthermore, in the present invention, when the size adjustment protrusion is provided on the synthetic resin member, the same effect can be obtained by forming the synthetic resin member from a material that is more fused than the cover.

Usually, in the case of ultrasonic welding, in order to ensure the bonding strength of the welded part, the materials of the members to be welded are made to be the same. Since the size-adjusting projection 8 is intended for size-adjusting melting, and joint strength is not necessary, in the first embodiment, the cover 22 and the valve seat frame 41 are made of different materials. In order to ensure the bonding strength between the cover 22 and the housing body 21, it is preferable that they are formed of the same material, but the material can be changed appropriately. Moreover, the material of the synthetic resin member of this invention can also be changed suitably, and can be the same material as the case 2.

In addition, according to the manufacturing method of the pressure reducing valve of the first embodiment, the spring seat and the step portion 21d are separated when the corner portion 22b comes into contact with the tapered surface 9, and the superposition of the housing body 21 and the cover 22 is started. After the sonic welding, melting of the contact portion between the cover 22 and the valve seat frame 41 (member made of synthetic resin) starts. Thereby, after ensuring the welding margin between the housing body 21 and the cover 22 , the size of the pressure reducing valve 1 can be adjusted by increasing or decreasing the melting amount of the contact portion between the cover 22 and the valve seat frame 41 . That is, since a welding margin between the case body 21 and the cover 22 can be ensured, it is easy to ensure the bonding strength between the case body 21 and the cover 22 .

In addition, in the first embodiment, the rib 22 a is formed on the outer periphery of the cover 22 , and the rib 22 a extends in the direction in which the cover 22 is inserted into the case body 21 . A groove portion 21f through which the rib portion 22a passes is formed on the inner periphery of the case body 21 . In this way, when the rib 22 a enters the groove 21 f, the cover 22 is locked against the housing body 21 , and the bonding strength between the cover 22 and the housing body 21 can be improved.

Furthermore, in 1st Embodiment, the rib part 22a is provided so that it may continue with the corner part 22b. Therefore, when the corner portion 22b is melted, the melted synthetic resin enters the gap between the rib portion 22a and the groove portion 21f to fill the gap, thereby further improving the bonding strength between the cover 22 and the housing body 21 . Furthermore, the number, thickness, and length of the ribs 22a and the grooves 21f can be appropriately changed. Furthermore, the rib portion 22a and the groove portion 21f may be omitted.

Moreover, in 1st Embodiment, the lower end of the inner peripheral part 43a is the same as the lower end of the inner ring part 41b, or it is located in the upper side. Thereby, when the front end of the cylindrical portion 31 of the valve body 3 is close to the O-ring, the water flow resistance becomes too large to generate a negative pressure, and the generation of abnormal noise can be suppressed. Moreover, as shown in the modification example of FIG. 10 , the lower end of the inner peripheral portion 43a may protrude downward from the lower end of the inner ring portion 41b. The other configurations of the pressure reducing valve 1 of this modification are the same as those of the first embodiment, and the same functions and effects are exerted.

As mentioned above, the pressure reducing valve and the manufacturing method of the 1st embodiment and 2nd embodiment were demonstrated, but this invention can change and change suitably within the range which does not deviate from the description of the invention patent claim.

1: Pressure reducing valve 2: shell 2a: Inflow port 2b: outflow port 3: valve body 4: Seat 5: spring compression member 6: Spring seat (synthetic resin components of other embodiments) 6a: Sealing member 6b: sealing member 7: Retainer (synthetic resin member of other embodiments) 8: Protrusion for size adjustment 9: Tapered surface 10: The first welding part 11: The second welding part 21: Shell body 21a: through hole 21b: Small diameter department 21c: Large diameter part 21d: step department 21e: bottom 21f: groove part 21g: Male thread part 21h: Peripheral step 22: cover 22a: Rib 22b: Corner 31: cylindrical part 32: protrusion 32a: sealing member 41: Valve seat frame (synthetic resin member of the first embodiment) 41a: Outer Ring 41b: Inner Ring 41c: Bridge 41f: The second fall-off prevention part 41g: Plane 42: O-ring 43: cover member 43a: Closed plate portion 43b: inner peripheral part 43c: The first anti-falling part x: size y: size

[ Fig. 1] Fig. 1 is an explanatory diagram showing an open state of a pressure reducing valve according to a first embodiment of the present invention. [ Fig. 2] Fig. 2 is an explanatory diagram showing a closed state of the pressure reducing valve according to the first embodiment of the present invention. [ Fig. 3 ] is a perspective view showing a cover of the pressure reducing valve according to the first embodiment of the present invention. [FIG. 4] It is a perspective view which shows the housing main body of the pressure reducing valve which concerns on 1st Embodiment of this invention. [ Fig. 5] Fig. 5 is an explanatory diagram showing a state before welding of the lid and the housing body of the pressure reducing valve according to the first embodiment of the present invention starts. [ Fig. 6] Fig. 6 is an explanatory diagram showing a state at the start of welding of the cover and the housing body of the pressure reducing valve according to the first embodiment of the present invention. [ Fig. 7] Fig. 7 is an explanatory diagram showing a state at the start of welding of the cover and the valve seat frame of the pressure reducing valve according to the first embodiment of the present invention. [ Fig. 8] Fig. 8 is an explanatory view showing a state in which the melting amount of the dimension adjustment protrusion of the pressure reducing valve according to the first embodiment of the present invention is small. [ Fig. 9] Fig. 9 is an explanatory view showing a state in which the size-adjusting projections of the pressure reducing valve according to the first embodiment of the present invention have a large melting amount. [ Fig. 10 ] is an explanatory diagram showing a modified example of the pressure reducing valve according to the first embodiment of the present invention.

1: Pressure reducing valve

2: shell

2a: Inflow port

2b: outflow port

3: valve body

4: Seat

5: spring compression member

6: Spring seat (synthetic resin components of other embodiments)

6a: Sealing member

6b: sealing member

7: Retainer (synthetic resin member of other embodiments)

8: Protrusion for size adjustment

10: The first welding part

11: The second welding part

21: Shell body

21a: through hole

21b: Small diameter department

21c: Large diameter part

21d: step department

21e: bottom

21g: Male thread part

21h: Peripheral step

22: cover

31: cylindrical part

32: protrusion

32a: sealing member

41: Valve seat frame (synthetic resin member of the first embodiment)

41a: Outer Ring

41b: Inner Ring

41c: Bridge

41f: The second fall-off prevention part

42: O-ring

43: cover member

43a: Closed plate portion

43b: inner peripheral part

43c: The first anti-falling part

x: size

y: size

Claims (9)

A pressure reducing valve having: A casing made of synthetic resin, which has an inlet and an outlet, and the fluid flowing in from the inlet can flow out from the outlet through the interior; a valve body, which is movably housed in the housing; a valve seat disposed within said housing; and an elastic member that elastically presses the valve body in a direction away from the valve seat, and The above-mentioned pressure reducing valve can block the flow of fluid in the above-mentioned casing by making the above-mentioned valve body resist the elastic force of the above-mentioned elastic member and abut against the above-mentioned valve seat by increasing the pressure of the fluid at the above-mentioned outflow port, The pressure reducing valve is characterized by: The housing includes a housing body and a cover, The synthetic resin member is disposed so as to be sandwiched between the case body and the cover, and The said cover is welded to the said synthetic resin member. Such as the pressure reducing valve of claim 1, wherein, The above-mentioned valve seat has a sheet member that can be in contact with the above-mentioned valve body, and a valve seat frame that holds the above-mentioned sheet member, The valve seat frame is the aforementioned synthetic resin member. Such as the pressure reducing valve of claim 1 or 2, wherein, The above-mentioned cover or the above-mentioned synthetic resin member has a protrusion for size adjustment, The cover is welded to the synthetic resin member by fusing the size adjustment projection. Such as the pressure reducing valve of claim 1 or 2, wherein, Either one of the above-mentioned cover on which the above-mentioned size adjustment protrusion is formed and the above-mentioned synthetic resin member is formed of a material that is more easily melted than the other. A method of manufacturing a pressure reducing valve, the pressure reducing valve has: The casing has an inlet and an outlet, and the fluid flowing in from the inlet can flow out from the outlet through the interior; a valve body, which is movably accommodated in the above-mentioned casing valve body; a valve seat disposed within said housing; and an elastic member that elastically presses the valve body in a direction away from the valve seat, and The above-mentioned pressure reducing valve can block the flow of fluid in the above-mentioned casing by making the above-mentioned valve body resist the elastic force of the above-mentioned elastic member and abut against the above-mentioned valve seat by increasing the pressure of the fluid at the above-mentioned outflow port, The manufacturing method of the pressure reducing valve is characterized in that: The housing includes a housing body and a cover, The synthetic resin member is disposed so as to be sandwiched between the case body and the cover, and The abutting portion between the lid and the synthetic resin member was oscillated with ultrasonic waves to melt. The manufacturing method of the pressure reducing valve as claimed in item 5, wherein, The above-mentioned valve seat has a sheet member that can be in contact with the above-mentioned valve body, and a valve seat frame that holds the above-mentioned sheet member, The valve seat frame is the aforementioned synthetic resin member. The manufacturing method of the pressure reducing valve as claimed in item 5 or 6, wherein, The cover or the synthetic resin member has a dimension adjustment protrusion on the contact portion, By oscillating the cap with ultrasonic waves, the size-adjusting protrusions are melted. The manufacturing method of the pressure reducing valve as claimed in item 5 or 6, wherein, Either the cover or the synthetic resin member on which the size adjustment protrusion is formed is formed of a material that is more easily melted than the other. The manufacturing method of the pressure reducing valve as claimed in item 5 or 6, wherein, After the ultrasonic welding of the housing main body and the cover is started, the melting of the contact portion between the cover and the synthetic resin member is started.

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