公开(公告)号：US5551473A

公开(公告)日：1996-09-03

申请号：US369415

申请日：1995-01-06

Applicant: Ping Lin ,  Anthony L. Arthur

Inventor： Ping Lin ,  Anthony L. Arthur

IPC: E03B7/10 ,  F16K17/04 ,  F16K24/02

CPC classification number: E03B7/10 ,  F16K17/0406 ,  Y10T137/1189 ,  Y10T137/3331 ,  Y10T137/7927 ,  Y10T137/87845 ,  Y10T137/87861

Abstract: A fluid flow control valve, e.g. a pressure vacuum breaker, includes a thermal expansion relief valve for protecting the control valve against damage due to freezing. The control valve has a valve body of rigid material and defines a main conduit. The thermal expansion relief valve has a relief valve body mounted to the main valve and defines a relief conduit in fluid communication with the main conduit, a valve element the moves within the relief conduit between a first sealing position in engagement with a valve seat to resist flow and a second position spaced from the valve seat to allow flow from the main conduit through the relief conduit, and a spring urging the valve element toward sealing position with a predetermined force selected to exceed normal operating pressure of the main valve and to lie below pressure damaging to the main valve. A thermal expansion valve for protecting fluid flow control valves, e.g. by retrofit, is also described.

Abstract translation: 流体流量控制阀，例如 压力真空断路器包括用于保护控制阀免受冻结损坏的热膨胀释放阀。 控制阀具有刚性材料的阀体并限定主管道。 热膨胀释放阀具有安装在主阀上的安全阀体，并且限定了与主管道流体连通的释放导管，阀元件在释放管道内移动在与阀座接合的第一密封位置以抵抗 流动和与阀座间隔开的第二位置，以允许从主管道通过释放管道流动;以及弹簧，以预定的力将阀元件推向密封位置，该预定力被选择为超过主阀的正常工作压力并位于下面 压力损坏主阀。 一种用于保护流体流量控制阀的热膨胀阀，例如 通过改造，也被描述。