<track id="11111"></track><strike id="11111"></strike>
      <strike id="11111"><delect id="11111"><dfn id="11111"></dfn></delect></strike>
      <strike id="11111"></strike>
      <font id="11111"><delect id="11111"><video id="11111"></video></delect></font>

      <ol id="11111"></ol><strike id="11111"></strike>

          <ins id="11111"><delect id="11111"></delect></ins>

            Analysis of safety valve

            Update Time :2013-04-16The view :885

            Safety valve is a safety valve, its opening and closing parts of external force in a normally closed state, when the device or medium pressure inside the pipe increases, exceeds the set value automatically open, to prevent the medium pressure piping or equipment exceeds the specified value discharge to the system through the medium. Safety valves are automatic valves, mainly used for boilers, pressure vessels and piping, control pressure does not exceed the specified value, the protection plays an important role in personal safety and equipment operation.

            Related Content
          天天狠天天透天干天天怕∴,男受被主人各种姿势调教惩罚,一个人看的www视频播放高清,中国少妇bbwbbw牲交