JP2023056716A - Method of reducing instrumental error of water meter and packing-integrated check valve used therefor - Google Patents

Method of reducing instrumental error of water meter and packing-integrated check valve used therefor Download PDF

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JP2023056716A
JP2023056716A JP2021166089A JP2021166089A JP2023056716A JP 2023056716 A JP2023056716 A JP 2023056716A JP 2021166089 A JP2021166089 A JP 2021166089A JP 2021166089 A JP2021166089 A JP 2021166089A JP 2023056716 A JP2023056716 A JP 2023056716A
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check valve
packing
water
valve shaft
rear end
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宏之 金井
Hiroyuki Kanai
晃 金子
Akira Kaneko
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Maezawa Kyuso Industries Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

To solve the problem that instrumental error of a water meter exceeds an acceptance tolerance because of turbulence in water flow caused by a rear end of a check valve shaft hindering the water flow when a packing-integrated check valve is installed immediately upstream of a water meter and a check valve body of the packing-integrated check valve is slightly open.SOLUTION: A given length of a rear end potion of a valve shaft of a check valve body is gradually tapered down into a tapered shape, R-shape or the like, or is machined to have groove-like recesses formed on an outer surface thereof such that a portion to be inserted to a hole of a packing mounting member has a plus-shaped cross-section and is tapered down toward a secondary side.SELECTED DRAWING: Figure 1

Description

本発明は、平成１７年３月、特定計量器（水道メーター・温水メーター等）の検定検査規則の改正に伴い注目されるようになったメーター機器に設定される逆止弁等の流量計測に与える影響について、その低減を図るための逆止弁の弁軸を備えたパッキン一体型逆止弁に関するものである。 In March 2005, the present invention was applied to flow rate measurement such as check valves set in meter equipment, which came to attract attention with the revision of the inspection and inspection regulations for specified measuring instruments (water meters, hot water meters, etc.). The present invention relates to a packing-integrated check valve having a check valve stem for reducing the influence.

水道メーターの計量要件については、ＪＩＳ Ｂ ８５７０－２に記載があり、定格最大流量Ｑ３[m3/h]を選択し、この流量から定格最小流量Ｑ１[m3/h]を求めるためＱ３/Ｑ１の比を選択、ここから転移流量Ｑ２[m3/h]はＱ２/Ｑ１＝1.6で求めることとされている。 The metering requirements for water meters are described in JIS B 8570-2, in order to select the rated maximum flow rate Q 3 [m 3 /h] and obtain the rated minimum flow rate Q 1 [m 3 /h] from this flow rate A ratio of Q 3 /Q 1 is selected, from which the transfer flow rate Q 2 [m 3 /h] is determined by Q 2 /Q 1 =1.6.

水道メーターの器差検定は次の3点の流量にて計測する。
１） Ｑ１と1.1×Ｑ１との間 （検定公差±５％）
２） Ｑ２と1.1×Ｑ２との間 （検定公差±２％）
３） 0.9×Ｑ３とＱ３との間 （検定公差±２％）
例えば、呼び径13の場合、Ｑ３＝2.5[m3/h]としＱ３/Ｑ１＝100とすると、Ｑ１＝0.025[m3/h]、Ｑ２＝0.04[m3/h]となる。これらの流量値より１） ２） ３）で確認を行い、器差が検定公差内であることを確認した水道メーターが出荷される。
パッキン一体型逆止弁を水道メーター直近の上流側に設置した試験の結果、特に１） ２）の近傍の流量で器差が大きくなり、検定公差（基準）を超える場合があることが判明している。 The instrumental error test of the water meter is measured at the following three points of flow rate.
1) Between Q1 and 1.1 x Q1 (verification tolerance ±5%)
2) Between Q2 and 1.1 x Q2 (verification tolerance ±2%)
3) Between 0.9 x Q3 and Q3 (verification tolerance ±2%)
For example, when the nominal diameter is 13, Q3 = 2.5 [m 3 /h] and Q 3 /Q 1 = 100, Q 1 = 0.025 [m 3 /h], Q 2 = 0.04 [m 3 /h] becomes. 1), 2), and 3) are checked based on these flow values, and the water meter is shipped after confirming that the instrumental error is within the calibration tolerance.
As a result of a test in which a check valve with integrated packing was installed on the upstream side of the immediate vicinity of the water meter, it was found that the instrumental error became large especially in the vicinity of 1) and 2), and sometimes exceeded the certification tolerance (standard). ing.

上記のＱ１とＱ２の流量を単位換算すると、
Ｑ１＝0.025[m3/h]≒0.417[L/min]
Ｑ２＝0.04[m3/h]≒0.667[L/min]
となり、Ｑ１とＱ２の流量は1[L/min]未満である。
日本水道協会規格ＪＷＷＡ Ｂ １２９「水道用逆流防止弁」の呼び径１３の基準流量16[L/min]と比べ、微小な流量でありパッキン一体型逆止弁の逆止弁体がわずかに開いた状態であり、このわずかに開いた状態では、弁軸の後端によって水の流れが妨げられ、水流が乱れることで、水道メーターの器差が検定公差を超えてしまうことがあることが判明した。 When unit conversion of the flow rate of Q1 and Q2 above,
Q1 = 0.025 [ m3 /h] ≈ 0.417 [L/min]
Q2 = 0.04 [ m3 /h] ≒ 0.667 [L/min]
As a result, the flow rates of Q1 and Q2 are less than 1 [L/min].
Compared to the standard flow rate of 16 [L/min] with a nominal diameter of 13 of the Japan Water Works Association standard JWWA B 129 "check valve for water supply", the flow rate is minute and the check valve body of the packing integrated check valve opens slightly. In this slightly open state, the rear end of the valve stem obstructs the flow of water, turbulent water flow, and the instrumental error of the water meter may exceed the certification tolerance. bottom.

水道メーターの流量計測と器差調整については、例えば特許文献１においては、調整盤に回転可能に支持された抵抗板の回転数によって計測し、抵抗板の支持位置を調整することによって器差調整を行うことが提案され、特許文献２においては、水道メーター内の流路を流れる水量に応じたデジタル（パルス）信号を取得することによって、より細かい単位で使用した水量を把握することが提案されている。 Regarding flow rate measurement and instrumental error adjustment of a water meter, for example, in Patent Document 1, measurement is performed by the number of rotations of a resistance plate rotatably supported on an adjustment panel, and instrumental error adjustment is performed by adjusting the support position of the resistance plate. In Patent Document 2, it is proposed to grasp the amount of water used in finer units by acquiring a digital (pulse) signal corresponding to the amount of water flowing through the flow path in the water meter. ing.

特開平７－２７０２０１号公報JP-A-7-270201 特開２０２１－７６３９０号公報JP 2021-76390 A

しかしながら、前記特定計量器（水道メーター・温水メーター等）の検定検査規則の改正に伴い、ＪＩＳ規格による圧力損失基準が採用されることによって、前記のような水道メーターに、逆流防止のために設定される逆止弁、特に、水道メーター直近の上流に設置される逆止弁の水流に対する影響が問題となる。 However, due to the revision of the certification and inspection regulations for the specified measuring instruments (water meters, hot water meters, etc.), pressure loss standards based on JIS standards have been adopted. The impact on the water flow of check valves installed immediately upstream of the water meter, in particular, is a problem.

従来の水道メーターの下流側直近に逆止弁を取付ける場合、水道メーターに流入する水に影響を与える要素はないので、基準を超える器差（メーター内を実際に通過した量に対して、メーターが示す量の差）は発生しない。 When installing a check valve just downstream of a conventional water meter, there are no factors that affect the water flowing into the water meter. ) does not occur.

しかしながら、前記１） Ｑ１と1.1×Ｑ１との間 （検定公差±５％）、２） Ｑ２と1.1×Ｑ２との間 （検定公差±２％）の近傍の流量で器差が大きくなり、検定公差（基準）を超える場合があることが、試験の結果判明している。
Ｑ１とＱ２の流量は、単位換算により、Ｑ１は 0.025[m3/h]≒0.417[L/min]、Ｑ２は 0.04[m3/h]≒0.667[L/min] となり、何れも、1[L/min]未満である。 However, there is an instrumental error at the flow rate near 1) between Q1 and 1.1 x Q1 (verified tolerance ±5%) and 2) between Q2 and 1.1 x Q2 (verified tolerance ±2%). As a result of the test, it has been found that there are cases where it becomes large and exceeds the verification tolerance (standard).
The flow rates of Q1 and Q2 are 0.025 [m 3 /h] ≈ 0.417 [L/min] for Q 1 and 0.04 [m 3 /h] ≈ 0.667 [L/min] for Q 2 by unit conversion. Both are less than 1 [L/min].

日本水道協会規格ＪＷＷＡ Ｂ １２９「水道用逆流防止弁」の呼び径１３の基準流量16[L/min]と比べ、微小な流量でありパッキン一体型逆止弁の逆止弁体がわずかに開いた状態であり、このわずかに開いた状態では、弁軸の後端によって水の流れが妨げられ、水流が乱れることで、水道メーターの器差が検定公差を超えてしまうものであるが、水道メーターに基準を超える器差が発生すると、水道メーターで計測された水量により水道使用者に対して水道料金が請求されるので、水道使用者に対して水道料金の過大請求や過少請求が発生し、水道料金請求システムに対する公明さと信用が失われるという大きな問題にも繋がるものである。 Compared to the standard flow rate of 16 [L/min] with a nominal diameter of 13 of the Japan Water Works Association standard JWWA B 129 "check valve for water supply", the flow rate is minute and the check valve body of the packing integrated check valve opens slightly. In this slightly open state, the rear end of the valve shaft obstructs the flow of water, turbulent water flow causes the instrumental error of the water meter to exceed the official approval tolerance. If an instrumental error occurs in the meter that exceeds the standard, the water bill will be billed to the water user based on the amount of water measured by the water meter. It also leads to major problems of lack of openness and trust in the water billing system.

本願発明は、前記課題を解決する手段として、逆止弁の弁軸後端の通水部の水路容積を徐々に拡張させることにより弁軸の後端によって水の流れが妨げられることを防止し、水の流れが整流され、逆止弁体がわずかに開いた微小な流量時であっても、水道メーターの器差を減少させることができる。
すなわち、実施例１として、パッキン一体型逆止弁の逆止弁体の弁軸の後端側を徐々に細くすることにより上記の効果を得ることができる。この手段によれば、他の作用的効果として、組立て時に逆止弁体を取付ける際、弁軸の後端が細くなっているので、パッキン取付け部材の弁軸摺動支持孔に逆止弁体を挿し込み易くなり組立性が向上するものである。 As a means for solving the above problems, the present invention prevents the water flow from being obstructed by the rear end of the valve shaft by gradually expanding the water channel capacity of the water passage portion at the rear end of the valve shaft of the check valve. , the flow of water is rectified, and the instrument error of the water meter can be reduced even when the check valve body is slightly open and the flow rate is very small.
That is, as Example 1, the above effect can be obtained by gradually narrowing the rear end side of the valve shaft of the check valve body of the packing-integrated check valve. According to this means, another operational effect is that when the check valve body is attached at the time of assembly, the check valve body can be inserted into the valve shaft sliding support hole of the packing mounting member because the rear end of the valve shaft is narrowed. can be easily inserted and the assembling efficiency is improved.

更に、実施例２として、パッキン取付け部材の弁軸摺動支持孔に通す弁軸の断面形状を、○形状ではなく、＋形状とすることで、通水部の断面積を○形状よりも拡げる（水路容積を拡張する）ことができる。これによっても、水道メーターの器差を減少させることができる。 Furthermore, as Example 2, the cross-sectional shape of the valve shaft that passes through the valve shaft sliding support hole of the packing mounting member is not a circle shape but a + shape, so that the cross-sectional area of the water passage part is wider than the circle shape. (to expand the channel volume). This also reduces the instrumental error of the water meter.

以上の構成は、逆止弁体がスプリングと逆止弁座と逆止弁パッキンによってカートリッジ本体内に収容固定されていることを前提とし、これにより、逆止弁体の後端から水道メーターの流入口まで一定の距離が確保でき、水道メーターの器差を減少させる効果を得ることができる。 The above configuration assumes that the check valve body is housed and fixed in the cartridge body by the spring, the check valve seat and the check valve packing. A certain distance can be secured to the inflow port, and the effect of reducing the instrumental error of the water meter can be obtained.

本発明の実施例を示すもので、本発明による弁軸を有する逆止弁体がパッキン一体型逆止弁のカートリッジ本体に挿嵌されている状態を示すパッキン一体型逆止弁の正面断面図である。1 is a cross-sectional front view of a packing-integrated check valve showing an embodiment of the present invention, showing a state in which a check valve element having a valve shaft according to the present invention is inserted into a cartridge body of the packing-integrated check valve; FIG. is. 同じく、図１のパッキン一体型逆止弁における水流の微小な流量時における水流の通水状態を矢印で示すパッキン一体型逆止弁の正面断面図である。Similarly, FIG. 2 is a front cross-sectional view of the packing-integrated check valve showing, by arrows, the flow state of the water flow when the flow rate of the water flow in the packing-integrated check valve of FIG. 1 is very small. 同じく本発明による弁軸を有する逆止弁体のカートリッジ本体内への挿嵌構造を示すもので、（ａ）はパッキン一体型逆止弁の正面断面図、（ｂ）は逆止弁体の正面断面図である。Similarly, a structure for inserting a check valve body having a valve shaft according to the present invention into a cartridge body is shown, (a) is a front cross-sectional view of a packing-integrated check valve, and (b) is a check valve body. It is front sectional drawing. 同じく本発明の他の実施例によるもので、弁軸の断面を＋形状とした実施例の逆止弁体の正面図と右側面図を対応させた対応図である。FIG. 10 is a corresponding diagram showing a front view and a right side view of a check valve body in another embodiment of the present invention in which the cross section of the valve stem is +-shaped. 同じく本発明による弁軸を有する逆止弁体を挿嵌するパッキン一体型逆止弁を、止水栓、伸縮管、水道メーターを順次連結したその他の配管を省略した状態を示す要部を切欠して示す全体正面図である。A packing-integrated check valve into which a check valve body having a valve shaft according to the present invention is inserted is cut out to show a state in which a stop cock, an expansion pipe, and a water meter are sequentially connected, and other piping is omitted. 1 is an overall front view shown in FIG.

以下、図面を参照して本発明の実施の形態を説明すると、１は逆止弁体で、弁傘１１とその中心部に植設されて逆止弁体を支持する弁軸１２から成り、水道メーターＸの１次側に伸縮管Ｙを介して設定されるパッキン一体型逆止弁のカートリッジ本体２の中に、伸張方向に付勢して張設されたスプリング４を介してカートリッジ本体２の１次側に設定された逆止弁座５に圧接して挿嵌される。 The embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a check valve body, which consists of a valve head 11 and a valve shaft 12 implanted in the center thereof to support the check valve body, The cartridge body 2 of the packing-integrated check valve, which is set on the primary side of the water meter X via the telescoping pipe Y, is inserted into the cartridge body 2 via the spring 4 that is stretched in the extension direction. is pressed against and inserted into the check valve seat 5 set on the primary side of the .

パッキン一体型逆止弁の１次側から水流が流入すると、逆止弁体１の弁傘１１に負荷される流圧が逆止弁体１を付勢するスプリング４を圧縮して逆止弁体１を２次側に移動させ、同逆止弁体１を逆止弁パッキン６から離間させてその隙間から水流を２次側に通水させるものである。 When a water flow flows in from the primary side of the check valve with integrated packing, the flow pressure applied to the valve head 11 of the check valve body 1 compresses the spring 4 that biases the check valve body 1 to open the check valve. The body 1 is moved to the secondary side, the check valve body 1 is separated from the check valve packing 6, and the water flow is conducted to the secondary side through the gap.

しかし、この通水については、前記のように逆止弁体がわずかに開いた状態では、弁軸の後端によって水の流れが妨げられ、水流が乱れることで、水道メーターの器差が検定公差を超えてしまう問題があるため、出願人において検討実験した結果、これを避けるためには、逆止弁体のカートリッジ本体２への挿嵌設定構造を次のような構造とする必要があることが判明した。 However, regarding this flow of water, when the check valve body is slightly open as described above, the rear end of the valve stem obstructs the flow of water, causing turbulence and turbulent water flow. Since there is a problem that the tolerance is exceeded, as a result of studies and experiments conducted by the applicant, in order to avoid this, it is necessary to adopt the following structure for setting the insertion and fitting of the check valve body into the cartridge body 2. It has been found.

すなわち、図３に示すように、水流の流圧によって移動する逆止弁体１の弁軸１２を支持するパッキン取付け部材の弁軸摺動支持孔の長さをＡ、弁体部通水部の水路容積拡張のための、弁軸後端部の軸外表縮径部の始点から弁軸摺動支持孔の後端まで（弁軸外表縮径部と弁軸摺動支持孔の重なっている部分）の長さをＢとして、Ｂ／Ａの値が０．１から０．９となる範囲に設定すると共に、弁軸後端部から、逆止弁座の水流流入部の開口径方向に拡開する拡開角度をＣとして、その角度を５乃至１５０度に設定する挿嵌設定構造とする。 That is, as shown in FIG. 3, A is the length of the valve shaft sliding support hole of the packing mounting member that supports the valve shaft 12 of the check valve body 1 that moves due to the flow pressure of the water flow; From the starting point of the reduced diameter portion on the outer surface of the valve shaft to the rear end of the sliding support hole for the valve shaft (the reduced diameter portion on the outer surface of the valve shaft and the sliding support hole overlap The length of the part) is set to B, and the value of B/A is set in the range of 0.1 to 0.9. The insertion setting structure is such that the expansion angle for expansion is set to C and the angle is set to 5 to 150 degrees.

この挿嵌設定構造を呼び径１３のＪＷＷＡ Ｂ １２９に相当するパッキン一体型逆止弁について実施適用したところ、Ａが５．５ミリ、Ｂが２．８ミリ、Ｂ／Ａの値が０．５１となり、Ｃは３０度であった。
因みに、弁軸後端部の先端から軸外表縮径部の開始位置までの長さをＤとして、出願人において実施適用したところ、配管の呼び径１３で、Ｄは２．９ミリとなっている。 When this insertion setting structure was applied to a packing integrated check valve corresponding to JWWA B 129 with a nominal diameter of 13, A was 5.5 mm, B was 2.8 mm, and the value of B/A was 0.5 mm. 51 and C was 30 degrees.
Incidentally, the length from the tip of the rear end of the valve shaft to the start position of the outer surface diameter reduction portion is D, and when the applicant applied it, D was 2.9 mm with a pipe nominal diameter of 13. there is

各呼び径に対応するＤの寸法は、呼び径１３で０．７から５．１ミリ、２０で１．４から７．０ミリ、２５で１．４から８．６ミリ、３０で２．１から１０．９ミリ、４０で２．６から１５．４ミリである。 The D dimension corresponding to each nominal diameter is 0.7 to 5.1 mm for nominal diameter 13, 1.4 to 7.0 mm for nominal diameter 20, 1.4 to 8.6 mm for nominal diameter 25, and 2.0 mm for nominal diameter 30. 1 to 10.9 mm, 2.6 to 15.4 mm at 40.

軸外表縮径部の実施例１は、逆止弁体の弁軸１２の後端をテーパー状に徐々に細くする場合である。流入開口部５１に通水する水流は、逆止弁体１の弁傘１１に流圧を負荷し、逆止弁体１を付勢するスプリング４を圧縮して逆止弁体１を２次側に移動させ、逆止弁体を逆止弁パッキン６から離間させてその隙間から水流を２次側に通水させ、水流の一部は弁傘１１の裏面から弁軸外表に沿ってパッキン一体型逆止弁の２次側に通水する。 Example 1 of the reduced diameter portion on the outer surface of the shaft is a case where the rear end of the valve shaft 12 of the check valve element is gradually tapered. The water flow passing through the inflow opening 51 applies fluid pressure to the valve head 11 of the check valve body 1, compresses the spring 4 biasing the check valve body 1, and pushes the check valve body 1 to the secondary position. side, the check valve body is separated from the check valve packing 6, and the water flow is passed through the gap to the secondary side, and part of the water flow flows from the back surface of the valve head 11 along the outer surface of the valve shaft to the packing. Water is passed through the secondary side of the integral check valve.

弁軸の後端部には、軸外表縮径部があることにより水路容積が徐々に拡張することで流出開口部３２から水道メーターＸに通水するものであり、これにより水道メーターの器差を減少させることができた。 At the rear end of the valve shaft, there is a reduced diameter portion on the outer surface of the shaft, which gradually expands the channel volume, allowing water to flow from the outflow opening 32 to the water meter X. could be reduced.

実施例２は、パッキン取付け部材３の弁軸摺動支持孔３１に通す弁軸１２の断面形状を、○形状ではなく、＋形状とするものである。これによる弁軸の軸外表部は図４に示されるように軸外表に溝状の凹陥２５を形成すると共に、２次側に向けて先細りの形状に形成される。これにより、通水部の断面積（水路容積）は○形状の場合より更に拡げられる。 In Example 2, the cross-sectional shape of the valve shaft 12, which is passed through the valve shaft sliding support hole 31 of the packing mounting member 3, is a + shape instead of a circle shape. As shown in FIG. 4, the outer surface of the valve stem thus formed has a groove-like depression 25 on the outer surface and is tapered toward the secondary side. As a result, the cross-sectional area (water channel volume) of the water passage portion is further expanded than in the case of the o shape.

本発明に係る水道メーターの器差の低減方法とこれに用いる逆止弁の弁軸は、上記のように、弁軸の後端によって水の流れが妨げられることを防止し、水路容積が徐々に拡張し水の流れが整流され、逆止弁体がわずかに開いた微小な流量時であっても、水道メーターの器差を減少させることができるので水道機器産業において極めて有為に利用することができる。 The method for reducing the instrumental error of a water meter according to the present invention and the valve shaft of the check valve used in this method prevent the rear end of the valve shaft from obstructing the flow of water, as described above, and the volume of the water channel gradually increases. , the water flow is rectified, and even when the check valve body is slightly open, the instrumental error of the water meter can be reduced, so it is extremely useful in the water equipment industry. be able to.

１ 逆止弁体
１１ 逆止弁体の弁傘
１２ 逆止弁体の弁軸
１３ ＋状弁軸の溝状凹陥
２ カートリッジ本体
２１ 逆止弁座の雄ねじと螺合する雌ねじ
３ パッキン取付け部材
３１ 弁軸摺動支持孔
３２ 流出開口部
４ スプリング
５ 逆止弁座
５１ 流入開口部
６ 逆止弁パッキン
７ パッキン
Ａ パッキン取付け部材の弁軸摺動支持孔の長さ
Ｂ 逆止弁軸後端部の軸外表縮径部の長さ
Ｃ 逆止弁座の水流流入部の開口径方向に拡開する拡開角度
Ｘ 水道メーター
Ｙ 止水栓の伸縮管
Ｚ 止水栓
Ｄ 弁軸後端部の先端から軸外表縮径部の開始位置までの長さ 1 Check valve element 11 Check valve element valve head 12 Check valve element valve shaft 13 + groove-shaped recess of valve shaft 2 Cartridge main body 21 Female thread that engages with the male thread of the check valve seat 3 Packing mounting member 31 Valve shaft sliding support hole 32 Outflow opening 4 Spring 5 Check valve seat 51 Inflow opening 6 Check valve packing 7 Packing A Length of valve shaft sliding support hole of packing mounting member B Check valve shaft rear end Length of the reduced diameter portion on the outer surface of the shaft C Angle of expansion in the radial direction of the opening of the water inflow portion of the check valve seat X Water meter Y Expandable pipe of the water stop valve Z Length from the tip to the start position of the off-axis surface reduction

Claims (5)

パッキン一体型逆止弁の逆止弁体の弁軸後端部の通水部の水路容積を徐々に拡張させることにより水道メーターの器差を減少させることを特徴とする水道メーターの器差低減方法。 An instrumental error reduction of a water meter characterized by reducing an instrumental error of a water meter by gradually expanding a channel volume of a water passage portion at the rear end of a valve shaft of a check valve element of a check valve with integrated packing. Method. カートリッジ本体への逆止弁体の挿嵌設定を、弁軸摺動支持孔の長さと弁軸摺動支持孔と重なる弁軸後端部の軸外表縮径部の長さの割合を０．１から０．９となる範囲に設定すると共に、弁軸後端部から、逆止弁座の水流流入部の開口径方向に拡開する拡開角度を５乃至１５０度に設定するようにした請求項１記載の水道メーターの器差低減方法。 The setting for inserting the check valve body into the cartridge body is such that the ratio of the length of the valve shaft sliding support hole and the length of the outer diameter reduction portion of the valve shaft rear end portion overlapping the valve shaft sliding support hole is set to 0.5. It is set in the range of 1 to 0.9, and the expansion angle from the rear end of the valve shaft in the radial direction of the opening of the water inflow portion of the check valve seat is set to 5 to 150 degrees. The method for reducing an instrumental error of a water meter according to claim 1. 逆止弁体の弁軸後端の所定長さ部の形状を徐々に細くするようにしたことを特徴とするパッキン一体型逆止弁。 A packing-integrated check valve characterized in that the shape of the predetermined length portion of the rear end of the valve shaft of the check valve body is gradually tapered. パッキン取付け部材の弁軸摺動支持孔に通す逆止弁体の弁軸の断面形状を軸外表に溝状の凹陥を形成する＋形状とすると共に、２次側に向けて先細りの形状とした請求項３記載のパッキン一体型逆止弁。 The cross-sectional shape of the valve shaft of the check valve body, which is inserted into the valve shaft sliding support hole of the packing mounting member, is a + shape in which a groove-shaped recess is formed on the outer surface of the shaft, and is tapered toward the secondary side. The packing-integrated check valve according to claim 3. パッキン一体型逆止弁が全開状態において、逆止弁体の弁軸後端がパッキン一体型逆止弁の２次側端面より外部に突き出ないようにした請求項３又は請求項４記載のパッキン一体型逆止弁。
5. The packing according to claim 3 or 4, wherein the rear end of the valve shaft of the check valve body does not protrude outside the secondary side end face of the packing-integrated check valve when the packing-integrated check valve is fully open. Integrated check valve.
JP2021166089A 2021-10-08 2021-10-08 Method of reducing instrumental error of water meter and packing-integrated check valve used therefor Pending JP2023056716A (en)

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