Aspirated balance piston专利检索-水力平衡暖气，通风和空调专利检索查询-专利查询网

Aspirated balance piston

阅读：953发布：2021-07-21

专利汇可以提供Aspirated balance piston专利检索，专利查询，专利分析的服务。并且In order to improve the balance of fluid forces existing in a balance plug innervalve assembly, a pressure tap is made at the approximate location of the lowest static pressure upstream of the disc seating surface and in close proximity to the vena contracta in order to aspirate the balance piston pressure chamber. This tap allows the lower static pressure to be transmitted to the balance piston by tubing or through a drilled passage in the valve stem to impart a modified piston force that is a closer balance of innervalve force. With this improved force balance, the initial droop is decreased in a self-contained regulator. In a balance piston-type globe valve the actuator size is reduced.，下面是Aspirated balance piston专利的具体信息内容。

权利要求

1. In a valve having a valve body having an inlet and an outlet; a valve seat within said valve body defining an opening communicating said inlet with said outlet; an innervalve plug for sealingly seating on said valve seat to seal said opening; a valve stem connected to said innervalve plug; a balance piston slidably mounted in said valve body to define a pressure chamber therewith, said piston being connected with said valve stem; a bias port in said valve body communicating said inlet with said pressure chamber; and means communicating said pressure chamber with a point adjacent said opening upstream of said innervalve plug to effect a pressure tap in close proximity to the vena contracta of a fluid flowing through said opening with said innervalve plug spaced from said valve seat.

2. In a valve as set forth in claim 1 said means including a plurality of bores in said body extending from a point adjacent said valve seat, and a communication passage in said stem communicating said bores with said pressure chamber.

3. In a valve as set forth in claim 1 said means is an aspirator tube extending from said pressure chamber.

4. A globe valve having a housing; a valve seat within said housing; an innervalve plug downstream of said seat for seating thereon; a pressure chamber in said housing; means connected to said innervalve plug for moving said plug relative to said seat, said means including a balance piston slidably mounted in said pressure chamber; and means communicating said pressure chamber with a point adjacent said seat to effect a pressure tap in close proximity to the vena contracta of a fluid flowing between said plug and said seat and to aspirate said chamber to effect a balanced force on said innervalve plug.

5. A globe valve as set forth in claim 4 further having an inlet in said housing for a flow of fluid and a bias port communicating said inlet with said pressure chamber.

6. A globe valve as set forth in claim 4 wherein said means for moving said plug includes a valve stem slidably mounted in said housing and connected between said balance piston and said innervalve plug.

7. A globe valve as set forth in claim 6 wherein said means communicating said pressure chamber with said point includes a passage means extending through said plug and said stem and opening into said pressure chamber.

8. A globe valve as set forth in claim 4 wherein said means communicating said pressure chamber with said point is a tube extending from said chamber to said point.

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Aspirated balance piston

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