The Spirax SafeBloc TM is a double block and bleed bellows sealed stop valve, accommodated within the same face-to-face dimension of a single valve. It has been designed for use as an in-line double ...

Control and block valves fall into one of two major categories ... An alternative to valve packing is a valve bellows seal. A bellows seal uses a welded or mechanically formed metal barrier around the ...

To prevent the hot air from being sucked back in as the bellow reciprocates, a row of check valves was added on each side of the PC chamber and at the external intakes. The sides of the bellow ...