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公开(公告)号：US4420010A
公开(公告)日：1983-12-13
申请号：US128240
申请日：1980-03-07
CPC分类号： E03C1/106 , E03C1/108 , F16K15/066 , Y10T137/263 , Y10T137/3331 , Y10T137/7504 , Y10T137/7842 , Y10T137/863
摘要： A device for preventing the back flow of water from a point of use into a water supply line. The device includes a unitary casing having an inlet, a central chamber, an outlet, a removal port and a drain vent opening. The inlet, the central chamber and the outlet are coaxially aligned. A relief valve is located in the central chamber and offset from the coaxial alignment of the inlet, the central chamber and the outlet. There is a cover for the removal port. There is also a pair of check valves. One is mounted between the inlet and the central chamber and the other is mounted between the outlet and the central chamber. The device allows water to pass unobstructed in a straight-through flow path through the device. The back flow of water is prevented.
摘要翻译： 一种用于防止水从使用点向供水管线返回流动的装置。 该装置包括具有入口，中央室，出口，移除端口和排水口的整体式外壳。 入口，中央室和出口同轴对准。 安全阀位于中心室中并偏离入口，中心室和出口的同轴对准。 拆卸端口有盖子。 还有一对止回阀。 一个安装在入口和中央室之间，另一个安装在出口和中央室之间。 该装置允许水通过穿过装置的直通流动通道畅通无阻。 防止水的回流。
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公开(公告)号：US4284097A
公开(公告)日：1981-08-18
申请号：US58566
申请日：1979-07-18
CPC分类号： E03C1/106 , E03C1/108 , F16K15/066 , Y10T137/3331 , Y10T137/7504 , Y10T137/7838 , Y10T137/7931
摘要： A back flow preventing device is disclosed which prevents the reverse flow of water from a point of use into a water supply system. The device has a casing with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line. The internally-located inlet and outlet check valves are each removably secured in place by internally-located retaining rings.
摘要翻译： 公开了防止来自使用点的水逆向流入供水系统的防回流装置。 该装置具有同轴对准的入口和出口开口的外壳，并且包含同轴排列的入口和出口止回阀。 入口和出口开口以及入口和出口止回阀的同轴排列用于使通过设备的压降最小化。 入口和出口止回阀之间是一个隔膜致动的安全阀，打开以排出止回阀之间的通道，如果它们出现故障或者供应管路压力下降足以导致实际的或潜在的反向回流向供应 线。 位于内部的入口和出口止回阀各自可以通过内部定位的固定环可拆卸地固定到位。
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公开(公告)号：US4207915A
公开(公告)日：1980-06-17
申请号：US830463
申请日：1977-09-06
IPC分类号： E03C1/10
CPC分类号： E03C1/106 , E03C1/108 , Y10T137/2589 , Y10T137/2607 , Y10T137/3331 , Y10T137/7668 , Y10T137/8085
摘要： A back flow preventer for preventing contamination of a water supply. The preventer includes check valves which are enclosed in a casing comprised of a body and a single removable cover. The check valves are vertically disposed and spaced laterally from each other. The valves may be removed for servicing when the cover is removed without disturbing other parts of the device. Between the check valves is a relief valve which opens to drain the passage between the check valves when there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line. The check valves open by movement in opposite directions. Each check valve unit includes a tubular strainer through which all water must pass. The check valve units, while identically dimensioned as to the valve structure, include other parts of unequal dimensions which preclude accidental reversal of the units when being initially assembled or replaced after servicing.
摘要翻译： 用于防止水源污染的回流防止器。 预防器包括封闭在由主体和单个可移除盖组成的壳体中的止回阀。 止回阀是垂直设置的并且彼此横向隔开。 当盖子被移除而不干扰装置的其它部分时，可以移除阀门进行维修。 在止回阀之间是一个安全阀，当释放供应管路压力足以导致实际或潜在的反向流向供应管路时，打开该排气阀以排出止回阀之间的通道。 止回阀以相反的方向运动打开。 每个单向阀单元包括管状过滤器，所有的水必须通过该过滤器。 单向阀单元虽然与阀门结构相同的尺寸，但包括不同尺寸的其他部件，这些部件在维修后初始组装或更换时，可防止单元意外反转。
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公开(公告)号：US4299248A
公开(公告)日：1981-11-10
申请号：US20087
申请日：1979-03-13
CPC分类号： F16K24/048 , Y10T137/3099 , Y10T137/7374
摘要： An air vent device for automatically venting entrapped air from hot water heating and chilled water cooling systems. The device can vent a large volume of air in a relatively short time by using a large vent opening, controlled by a pilot valve operated diaphragm venting valve. The pilot valve, actuated by a spring and connected to a float, permits air pressure within the device to pass to the rear of the diaphragm valve to maintain it in a closed position during normal operation of the system. When the float drops to a predetermined position the float weight overcomes the spring force and the pilot valve vents the rear side of the diaphragm valve to atmosphere, allowing it to open, thereby venting the air collected in the device to atmosphere.
摘要翻译： 一种用于自动排放热水加热和冷冻水冷却系统的夹带空气的排气装置。 该装置可以通过使用由先导阀操作的隔膜排气阀控制的大的排气口在相对短的时间内排出大量的空气。 由弹簧致动并连接到浮子的先导阀允许装置内的空气压力通过隔膜阀的后部，以在系统的正常操作期间将其保持在关闭位置。 当浮子下降到预定位置时，浮子重量克服弹簧力，先导阀将隔膜阀的后侧通向大气，允许其打开，从而将装置中收集的空气排放到大气中。
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公开(公告)号：US4165951A
公开(公告)日：1979-08-28
申请号：US811717
申请日：1977-06-30
申请人： Yizhak Friedman , Bernard B. Becker
发明人： Yizhak Friedman , Bernard B. Becker
CPC分类号： E03B5/00 , Y10T137/7764 , Y10T137/7766
摘要： A water pressure booster system is disclosed having a control device which regulates the pressure in the distribution system via a closely balanced piston valve. Flow into the system from a pump is controlled by a throttling valve which is actuated by the pressure differential between the system pressure and a constant pressure acting on a closely balanced piston. Flow from the system back into the pump is prevented by a flow control/check valve within the throttling valve.
摘要翻译： 公开了一种水压增压系统，其具有通过紧密平衡的活塞阀来调节分配系统中的压力的控制装置。 从泵流入系统由节流阀控制，该节流阀由系统压力和作用在紧密平衡的活塞上的恒定压力之间的压差驱动。 通过节流阀内的流量控制/止回阀防止从系统返回到泵的流量。
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