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1. 发明授权

US06293013B1 Backflow prevention assembly 失效
标题翻译：防回流组件
公开(公告)号：US06293013B1
公开(公告)日：2001-09-25
申请号：US09602702
申请日：2000-06-23
申请人： Lester Engelmann
发明人： Lester Engelmann
IPC分类号： B21C3728
CPC分类号： E03B7/077 , F16K15/035 , Y10T29/49428 , Y10T137/0497 , Y10T137/7838 , Y10T137/7898 , Y10T137/87917
摘要： A backflow prevention assembly has a unitary housing with a passage therethrough, two threaded regions formed in an inner surface of the unitary housing, and two valve assemblies positioned in the passage to prevent fluid flow in a direction. Each valve assembly has an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing. The threads can be formed by placing a die having a thread on an outer surface thereof in contact with an inner surface of the unitary housing, and pressing on the outer surface of the housing.
摘要翻译：防回流组件具有通过其的通道的整体壳体，形成在整体式壳体的内表面中的两个螺纹区域和位于通道中的两个阀组件，以防止流体沿一个方向流动。每个阀组件具有环形安装件，其具有与壳体内表面上的螺纹区域中的一个接合的螺纹外表面。螺纹可以通过将具有螺纹的模具放置在其外表面上而与单一壳体的内表面接触并且压在壳体的外表面上而形成。

2. 发明授权

US06675110B2 Testing valve assemblies 有权
标题翻译：测试阀组件
公开(公告)号：US06675110B2
公开(公告)日：2004-01-06
申请号：US10046111
申请日：2002-01-15
申请人： Lester Engelmann
发明人： Lester Engelmann
IPC分类号： G01M1900
CPC分类号： F16K37/0091 , Y10T137/2567 , Y10T137/2584
摘要： A method of determining flow through a valve includes determining a first differential pressure across the valve. The valve is bypassed and a second differential pressure is determined across the valve. A flow decision is determined for the valve based on comparison of the first and second differential pressures. A method of testing a relief valve in a reduced pressure backflow preventer assembly includes determining a first differential pressure across an upstream check valve during a no flow condition. The upstream check valve is bypassed for the purpose of opening a relief valve, and a zone vent is opened.
摘要翻译：确定通过阀的流量的方法包括确定阀两端的第一差压。旁通阀，并在阀门两端确定第二压差。基于第一和第二压差的比较来确定阀的流量决定。一种在减压防回流器组件中测试溢流阀的方法包括在无流动状态期间确定跨越上游止回阀的第一差压。为了打开安全阀，旁路上游止回阀，打开一个区域通风口。

3. 发明授权

US06502598B2 Backflow prevention assembly 失效
公开(公告)号：US06502598B2
公开(公告)日：2003-01-07
申请号：US09958839
申请日：2001-10-12
申请人： Lester Engelmann
发明人： Lester Engelmann
IPC分类号： F16K1503
CPC分类号： E03B7/077 , F16K15/035 , Y10T29/49428 , Y10T137/0497 , Y10T137/7838 , Y10T137/7898 , Y10T137/87917
摘要： A backflow prevention assembly has a unitary housing with a passage therethrough, two threaded regions formed in an inner surface of the unitary housing, and two valve assemblies positioned in the passage to prevent fluid flow in a direction. Each valve assembly has an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing. The threads can be formed by placing a die having a thread on an outer surface thereof in contact with an inner surface of the unitary housing, and pressing on the outer surface of the housing.

4. 发明授权

US06192933B1 Backflow prevention assembly 失效
公开(公告)号：US06192933B1
公开(公告)日：2001-02-27
申请号：US09454680
申请日：1999-12-03
申请人： Lester Engelmann
发明人： Lester Engelmann
IPC分类号： F16K1503
CPC分类号： E03B7/077 , F16K15/035 , Y10T29/49428 , Y10T137/0497 , Y10T137/7838 , Y10T137/7898 , Y10T137/87917
摘要： A backflow prevention assembly has a unitary housing with a passage therethrough, two threaded regions formed in an inner surface of the unitary housing, and two valve assemblies positioned in the passage to prevent fluid flow in a direction. Each valve assembly has an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing. The threads can be formed by placing a die having a thread on an outer surface thereof in contact with an inner surface of the unitary housing, and pressing on the outer surface of the housing.

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