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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/554 ; 324/207 ; 340/87031 ; 137/5278|
|발명자 / 주소||
|출원인 / 주소||
|인용정보||피인용 횟수 : 12 인용 특허 : 7|
A non-return valve for a steam turbine steam line includes a housing and a clapper swingably mounted in the housing for angular movement between open and closed positions. A metal proximity detector is mounted on the interior surface of the cover for the valve access opening and adjacent the open position of the valve. Movement of the clapper away from its open position results in a signal providing an indication that the valve clapper is away from its open position.
A steam turbine extraction line non-return valve, said valve comprising: a housing; a clapper swingably mounted in the housing for angular movement between open and closed positions; a metal proximity detector including electrically responsive means comprising at least one coil element mounted within the valve housing adjacent said open position of the clapper for providing a change in electrical signal whenever said clapper is not located at its said open position; and a ceramic housing mounted flush against an interior surface of the valve, said coil e...