CN109073097A - 带有三重密封的球阀座 - Google Patents
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0673—Composite packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/04—Arrangements for preventing erosion, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
本发明为一种球阀座,该阀座设计沿阀座的内表面界定轴向孔。阀座内表面与流体接触。在阀座内表面的一端,阀座包含接触球的接触部位。接触部位包含一个金属‑金属密封面、热塑性密封圈和弹性体密封圈。金属‑金属密封面靠近所述内表面的近端,弹性体密封圈置于内表面的远端,热塑性密封圈位于其间,其中,金属‑金属密封面抵靠球阀密封,以密封流体,使之远离热塑性和弹性体密封圈。
Description
背景技术
球阀的阀座在现有工艺技术领域中是众所周知的。球和阀座由特定材料组成,其类型取决于温度、压力和流经球阀的流体类型等多种因素。例如,含有大量颗粒物质的流体需要具有抗磨损性能的球和阀座材料。
众所周知,阀座内还包括额外的密封元件,以改善阀门的关闭性能和防止泄漏功能。常见的密封元件包括热塑性密封圈和弹性体密封圈。密封元件的选择取决于温度、流体类型和压力大小等因素。
弹性体密封圈优于热塑性密封圈,在以下几个方面有一定优势:例如,弹性体密封圈更容易压缩,因此与诸如树脂的热塑性材料相比,密封所需的工作压力要低得多(即,将阀座推向球所需的力更小)。此外,弹性体密封圈制造成本更低。由于热塑性密封圈抗压,它们需要精确的球形轮廓、几何结构和球表面抛光来实现坚固的密封。这一精度要求导致了更高的生产成本。
弹性体密封圈的另一个优点是,即使在弹性体密封圈或球面有少量损坏时(即,例如,磨损引起的划痕或凹槽),它们也能形成密封圈。弹性材料可以“填充”凹槽和划痕,而当热塑性密封圈或球面受到少量损坏时,更刚性的热塑性密封圈的性能就会下降。
然而,现有工艺技术的弹性体密封圈的一个主要问题是它们容易受到损坏。例如,当流体进入部分开启的阀门时,高压会导致弹性体密封圈受到挤压。在高压工作条件下,挤压问题变得更加严重。此外,弹性体密封圈容易受到某些流体中可能存在的微粒颗粒物质的磨损。
在另一方面,热塑性密封圈比弹性体密封圈的多几个优势。热塑性密封圈具有抗腐蚀性能,对于许多类型的流体来说是惰性的,因此适用于更广泛的应用范围。与弹性体密封圈相比,热塑性密封圈的另一个优点是热塑性材料几乎是不透气的,因此使用热塑性密封圈可以降低在发生快速减压时阀门可能发生暴发性减压的危险。
热塑性密封圈还更耐压缩,因此在不希望球与阀座之间发生金属-金属接触时非常有用。此外,热塑性密封圈比弹性体密封圈更耐磨。
它也以制造带金属密封元件的球阀组件而闻名。金属-金属阀座适用于涉及磨料流体、磨蚀性流体、腐蚀性流体和需要高温和高压的应用场合而制造的。例如,带有塑料、聚合物或弹性密封元件的阀座承受不了超过250℃的温度。
所需的球阀座应具有更好的耐磨性、更高的耐用性和弹性以及优越的密封性能。
发明内容
在一个实施方案中,本发明是一种球阀座,该阀座设计是沿阀座的内表面界定轴向孔。阀座内表面与流体接触。在阀座内表面的一端,阀座包含用于接触球的接触部位。接触部位包括金属-金属密封面、热塑性密封圈和弹性体密封圈。金属-金属密封面设置于内表面近端,弹性体密封圈设置于内表面远端,热塑性密封圈位于其间,其中,金属-金属密封面抵靠球阀密封,以密封流体,使之远离热塑性和弹性体密封圈。
在另一个实施方案中,本发明是一种球阀座,该阀座沿着阀座的内表面界定轴向孔。阀座内表面与流体接触。在阀座内表面的一端,阀座包含用于接触球的接触部位。接触部位界定了至少有一个环形开口。阀座接触部位还包含一个金属-金属密封面、在至少有一个环形口内的热塑性密封圈以及在至少一个环形口内的弹性体密封圈。金属-金属密封面设置于内表面近端,弹性体密封圈设置于内表面远端,热塑性密封圈位于其间,其中,金属-金属密封面抵靠球阀密封,以密封流体,使之远离热塑性和弹性体密封圈。
附图说明
图1是现有工艺技术的球阀。
图2是球阀座的透视图。
图3是一个球阀和两个阀座的横断面图。
图4是图3中所示阀座的横断面放大图。
图5是图3中所示替代实施例的横断面放大图。
具体实施方式
本发明是一种提高耐久性、回弹性和密封性能的球阀座。本发明还提供一种减少操作球阀所需扭矩量的球阀座。
图1显示了插入管(10)内的典型球阀。界定孔(30)的球(20)位于两个阀座(40)之间。当阀门处于开启位置时,流体流过孔(30)。当球(20)旋转到封闭位置时,阀座(40)盖住孔(30),以防止液体泄漏。
图2和图3显示了本发明的阀座(40)。阀座(40)包括两个端点。改进后的第一端(120)用于将球阀(20)连接或插入到管道内(未显示)。该阀座还界定了阀座孔(130),从而提供了一个与流经管道的流体接触的阀座内表面(未显示)。
第二端,此处称为阀座(40)的接触部位(50),用于密封球阀(20)。如图2所示,三个环形密封元件防止流体从球(20)漏出,即弹性体密封圈(60)、热塑性密封圈(70)和金属-金属密封面(100)。在首选的实施方案中/用阀座内表面(140)作为参考点,三个环形密封圈的顺序如下:1.金属-金属密封面(100)2.热塑性密封圈(70)3.弹性体密封圈(60)(也参见图4)。金属-金属表面(100)设置于阀座内表面(140)近端,以便进入阀座孔(130)的流体首先接触阀座的金属-金属密封面(100)与球(20)之间形成的密封圈。任何泄漏都会接触到热塑性密封圈(70),其次是弹性体密封圈(60)。
在图5所示的替代实施例中,三个环形密封圈的顺序(再次使用阀座内表面(140)作为参考点)是:1.热塑性密封圈(70)2.弹性体密封圈(60)3.金属-金属密封面(100)。在本实施例中,进入阀座孔(130)的流体将首先接触热塑性密封圈(70)。任何泄漏都会接触弹性体密封圈(60),然后接触金属-金属密封面(100)和球(20)之间形成的密封圈。环状间隙(150)允许阀座在高压/高温条件下伸缩。
三个环形密封圈可以彼此分开,也可以彼此紧邻。紧邻意味着一个密封元件与相邻的密封元件邻接。
为了适应弹性体密封圈(60)和热塑性密封圈(70),阀座接触面(50)界定了至少一个环形开口(80)和(90);(如图3和4中的横截面所示),其充当每个弹性体密封圈(60)和热塑性密封圈(70)的外壳。弹性体密封圈(60)和开口(80)紧邻热塑性密封圈(70)和开口(90)。
如图3、4和5所示,弹性体密封圈采用三角断面密封圈的形式,如申请人先前披露的那样。三角断面密封圈(60)基本上是一个三角的(如希腊字母中的三角形),当在横截面上观察时,有一个截断的顶端(见图3、4和5)三角断面密封圈已经被证明能抵抗挤压和损伤。现有技术还表明,将三角断面密封圈(60)与热塑性密封圈(70)紧邻(并紧靠)放置,可提高密封圈(60)的固位力,从而降低三角断面密封圈(60)挤压的可能性。
适用于热塑性密封圈的热塑性材料的实例包括树脂,如尼龙6、尼龙6+二硫化钼、尼龙+玻璃纤维、尼龙12德威龙、聚醚醚酮-V、聚醚醚酮-S、聚醚醚酮-E、聚醚醚酮、聚四氟乙烯、聚醚醚酮+石墨、纯聚四氟乙烯、聚醚醚酮碳填充/方法、聚氯代三氟乙烯和聚酰亚胺。适用于弹性体密封圈的弹性材料的实例包括氟橡胶AED、氟橡胶B、氟橡胶GLT AED、氟橡胶+聚四氟乙烯喷涂,氢化丁腈橡胶AED、四丙氟橡胶、聚氨酯和三元乙丙橡胶。
阀座金属-金属密封面(100)是根据工艺中已知的方法制造的。为了防止阀座和球体金属表面的划痕或划伤,众所周知,在球体(110)和阀座(此处标识为金属-金属密封面100)上都涂了一种金属涂层,例如碳化钨、凯扶兰TMH834和碳化铬。一旦涂上涂层,涂层表面将使用金刚石削片打磨机进行抛光。一旦涂上涂层和经过抛光后,将采用研磨工艺以确保球座和球之间的金属-金属密封圈是密封的。
在图2和图4所示的首选实施方案中,当球(20)旋转到闭合位置时,流体将首先遇到在阀座金属-金属密封面(100)和球(20)之间形成的金属-金属密封圈,然后是热塑性密封圈(70),接着是弹性体密封圈(60)。金属-金属密封圈能更好地承受流体中可能存在的碎片和其他颗粒物,并保护热塑性和弹性体密封元件免受损坏。热塑性密封圈(70)比弹性体密封圈(60)更能承受流体中可能存在的碎片和其他颗粒物。如果有任何流体漏过热塑性密封圈(70),弹性体密封圈(60)将防止流体从球阀泄漏。
本发明的一个令人惊喜的优点是减少了开启和关闭阀门所需的扭矩。必须建立的用于开启和关闭阀门的致动器,以满足某些监管安全标准。虽然金属-金属球阀座装配组件在该技术领域是众所周知的,一般情况下,球阀座与球之间的接触面越大,阀门开启和关闭所需的扭矩量就越大。出乎意料的是,在申请人的球阀座上进行的扭矩测试包括本文所述的三个环形密封元件,结果表明,与仅带有金属-金属密封圈的现有工艺技术球阀座相比,开启和关闭本发明球阀座的球阀所需的扭矩降低了20%-30%。这意味着在制造阀门开启和关闭所需的致动器方面节省了成本。
本发明特别适用于高温/高压应用和高磨料材料。一种具体应用是天然气管道,在那里阀门之间有很长的距离,这些阀门埋在地下,因此在紧急情况下不易进入。为了防止天然气流失,以及为了安全和环境考虑,阀门组件必须坚固耐用,能够提供防漏密封。本文描述的发明提供了耐磨性和可靠的弹性密封。
此外,为了维护管道,用“金属块”来清洗管道,并用X光线检查管道,以跟踪和防止管道的腐蚀。当进行清洗时,碎屑被截留在阀门组件的间隙中,这将损害了在现有技术的中的球阀座的热塑性和弹性体密封圈。本文描述的球阀座的金属-金属密封圈保护了热塑性和弹性体密封元件,使其免受管道流体内碎屑的磨损。
申请人提供的解决方案出乎意料地降低了操作阀门所需的扭矩,并具有提高球阀座的耐久性、弹性和性能的优点。
Claims (8)
1.一种用于球阀的阀座,该阀座沿阀座的内表面界定轴向孔,阀座内表面与流体接触,该阀座包括:
用于接触球的接触部位,位于阀座内表面一端的接触部位,该接触部位包括:
金属-金属密封面,
热塑性密封圈,以及
弹性体密封圈,
其中,金属-金属密封面设置于阀座内表面近端,弹性体密封圈设置于阀座内表面远端,热塑性密封圈位于其间,其中,金属-金属密封面抵靠球阀密封,以密封流体,使之远离热塑性和弹性密封圈。
2.如权利要求1所述之阀座,其中,热塑性密封圈设置于靠近阀座内表面的阀座接触部位,金属-金属密封面设置于阀座内表面远端,弹性体密封圈位于阀座内表面之间。
3.如权利要求1所述之阀座,其中,弹性体密封圈包括三角断面密封圈,其中三角断面密封圈的顶端呈放射状向内指向阀门,三角断面密封圈的底部呈放射状远离球阀。
其中,密封座比顶端宽,顶端向阀门突出;并且
密封顶端被截断,以界定一个用于密封球阀的基本平坦的顶面。
4.如权利要求3所述之阀座,其中,热塑性密封圈设置于阀座内表面近端,金属-金属密封面设置于阀座内表面远端,三角密封圈位于其间。
5.一种用于球阀的座,该阀座沿阀座内表面界定轴向孔,阀座内表面与流体接触,该阀座包含用于接触球的接触部位,该接触部位设置于阀座内表面的一端,阀座接触部位进一步界定至少一个环形开口,其中阀座接触部位还包括:
金属-金属密封面,
在至少一个环形开口内的热塑性密封圈,
以及
在至少一个环形开口内的弹性远端密封圈,其中,金属-金属密封面设置于内表面近端,弹性体密封圈设置于内表面远端,热塑性密封圈设置于其间,其中,金属-金属密封面抵靠球阀密封,以密封流体,使之远离热塑性和弹性体密封圈。
6.如权利要求5所述之阀座,其中,热塑性密封圈设置于靠近阀座内表面的阀座接触部位,金属-金属密封面设置于阀座内表面的远端,弹性体密封圈设置于其间。
7.如权利要求5所述之阀座,其中,弹性体密封圈包括一个三角断面密封圈,其中三角断面密封圈的顶端呈放射状向内指向阀门,三角断面密封圈的底部呈放射状远离球阀;
其中,三角密封底座比顶端宽,顶端突出于开口之外,向阀门突出;并且,
三角密封顶端被截断,以界定一个基本平坦的顶面,而三角密封圈仍延伸到开口之外并向阀门延伸。
8.如权利要求7所述之阀座,其中,热塑性密封圈设置于阀座内表面的近端,金属-金属密封面设置于阀座内表面的远端,三角密封圈设置于其间。
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PCT/CA2016/050327 WO2017161434A1 (en) | 2016-03-22 | 2016-03-22 | Ball valve seat with triple seal |
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CN109073097A true CN109073097A (zh) | 2018-12-21 |
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US (1) | US20190107211A1 (zh) |
CN (1) | CN109073097A (zh) |
CA (1) | CA3018562A1 (zh) |
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US10801627B2 (en) * | 2018-12-07 | 2020-10-13 | Flowserve Management Company | Valve seats, valve assemblies, and related methods |
US11242933B2 (en) | 2019-06-03 | 2022-02-08 | Fisher Controls International Llc | Floating valve seat for a rotary control valve for use in severe service applications |
IT201900019496A1 (it) * | 2019-10-22 | 2021-04-22 | A V V Added Value For Valves S R L | Guarnizione per valvola a sfera |
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US20190107211A1 (en) | 2019-04-11 |
WO2017161434A1 (en) | 2017-09-28 |
CA3018562A1 (en) | 2017-09-28 |
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