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    • 3. 发明授权
    • Valve having a bias-mounted elastomeric sealing element, and method of
constructing the same
    • 具有偏置安装的弹性体密封元件的阀及其构造方法
    • US4373550A
    • 1983-02-15
    • US172563
    • 1980-07-28
    • William Yelich
    • William Yelich
    • F16K15/00
    • F16K15/00Y10T137/7867Y10T137/7868
    • A radially inner portion of a flat annular elastomeric washer is inserted and retained in a frustoconical annular groove formed in a cylindrical valve seat of an inline disc check valve. The groove is positioned and dimensioned so that it grips the washer and holds it in a radially stretched, axially skewed configuration wherein one of the washer's outer peripheral corner edges forms a leading sealing edge of the valve seat. At low back pressures in the valve, a line seal is formed between the leading washer edge and the valve's closure disc. High back pressures cause the disc to rearwardly deflect the protruding radially outer portion of the washer and engage the valve seat itself. Because the installed washer is both radially stretched and axially skewed, forward flow through the valve does not tend to dislodge the washer, and reverse flow around the washer portion within the groove is prevented.
    • 扁平环形弹性垫圈的径向内部插入并保持在形成在直列盘式止回阀的圆柱形阀座中的截头圆锥形环形槽中。 槽的定位和尺寸使得其夹紧垫圈并将其保持在径向拉伸的轴向倾斜构造中,其中垫圈的外周角边缘之一形成阀座的引导密封边缘。 在阀的低背压下,在前垫圈边缘和阀的封闭盘之间形成线密封。 高背压导致盘向后偏转垫圈的突出的径向外部,并与阀座本身接合。 由于安装的垫圈径向拉伸并且轴向倾斜,所以通过阀的向前流动不会倾向于移动垫圈,并且防止在槽内的垫圈部分周围的反向流动。
    • 6. 发明授权
    • Backflow preventer valve assembly
    • 逆流预防阀组件
    • US3837358A
    • 1974-09-24
    • US20502271
    • 1971-12-06
    • CLA VAL CO
    • ZIEG CYELICH W
    • E03C1/10E03B7/07
    • E03C1/106E03C1/108Y10T137/3331Y10T137/87917Y10T137/88054
    • Two series-related check valves are separated by a chamber (the ''''zone'''') adapted to be drained by a relief valve in order to insure against backflow of water through the check valve which is nearest the water main. The relief valve incorporates a poppet which is operated by the combined actions of a single diaphragm assembly and a single bellofram assembly, together with a spring which biases the poppet toward open position. The valve seat for the poppet has an effective diameter slightly greater than that of the bellofram assembly, whereby to create a seating pressure which maintains the poppet fully closed at all times except when there is an actual or incipient backflow condition. The poppet seat is beveled in a manner which creates valve-opening forces in response to initial cracking of the poppet off its seat. Furthermore, the clamping disc for the poppet is shaped to cause additional valve-opening forces to be present upon such cracking of the poppet.
    • 两个系列相关的止回阀由适于由安全阀排出的腔室(“区域”)隔开,以便确保水通过最靠近水主的止回阀的回流。 安全阀结合了一个提升阀,该提升阀由单个隔膜组件和单个组合组件的组合作用一起操作,以及将提升阀偏压到打开位置的弹簧。 用于提升阀的阀座的有效直径略大于罩式组件的直径,由此产生一个就座压力,除非存在实际或初始的回流状态,否则始终将提升阀完全关闭。 提升阀座以一种方式倾斜,从而响应于阀芯离开其阀座的初始裂纹而产生阀门开启力。 此外,用于提升阀的夹紧盘成形为在提升阀的这种开裂时产生额外的开启力。