There are available in three different kinds: threaded, butt-weld, and socket weld.
目前有三种不同类型：带螺纹的，碰焊，承插焊接。
The end flange is available in either threaded, or socket-weld styles.
目前有三种不同类型：带螺纹的，碰焊，承插焊接。
The Universal Socket Weld check valve is designed for use in applications where weld joints are required.
通用承插焊止回阀是为要求焊接的应用场合而设计的。
The Universal Socket Weld check valve is designed for use in applications where weld joints are required.
通用承插焊止回阀是为要求焊接的应用场合而设计的。
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