A downhole device that enables circulation through the tubing string and associated annulus. As a completion accessory, a circulation valve is included to circulate fluid for well kill or kickoff. Circulation valves typically are operated by slickline tools and are generally capable of several opening and closing cycles before requiring service.
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Nominal diameter and flow valves, basically the same breath for full-bore type, Circulation than nominal diameter valve is given. it small called non-reducing type.
流道孔径与阀门公称通经，基本相同的为全通径式；流通孔径比阀门公称通经小的称为缩径式。
In nature, veins acting as valves are controlling the blood circulation; heart valves control the flow of blood in the Chambers of the heart and maintain the correct pumping action.
在自然界中，静脉作为排气阀控制血液循环，心脏瓣膜控制血液的流量在心室的，保持正确的抽水行动。
Valves and equipment may be included in the circulation system provided that their materials are resistant to chemical solutions involved and prior approval of the Engineer is obtained.
如果阀门和设备抗化学溶剂腐蚀，在事先得到工程师许可条件下可进入清洗循环系统；
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