Five Valve Manifolds - Blowdown - HM56/55 Series

HM56/55 Series Five Valve Manifolds - Blowdown


For differential pressure applications, the Hex five valve blowdown manifold performs the block and equalizing functions of a standard three valve manifold and provides two additional block valves to be used for blowdown purposes. To blow down the impulse lines, the block valves on the manifold are closed, and the two blowdown valves are opened, allowing the impulse lines to be blown out through the ports on the lower side of the blowdown valves.

The design of the HM56 allows the user to install just one compact assembly that eliminates eight nipples, four tees, and two shutoff valves that are required for a conventional blowdown valve installation. In addition, the HM56 incorporates a single flange, which enables the installer to mount the transmitter directly to the mounting flange, thereby eliminating the installation of even more tubing and nipples.

The HM55 is identical to the HM56 except both the process and instrument connections are threaded for in-line installations.


  • Non-Rotating Tip (NRT) Stem - Provides tight, repeatable shutoff without the galling or cross-scoring that occurs on ball type stems.
  • Reduce Costs & Installation Time - Use a five valve blowdown manifold in place of the conventional arrangement of nipples, pipes, elbows, tees and gate valves for a single compact, low cost, easy-to-install valve assembly.
  • Choice of Mounting Options - Choose from line-mounted (HN55) or single flanged (HM56) to match your specific requirements. Also available with Rigid Mount option for ease of instrument mounting.
  • Inside Rising Stem/Backseated Bonnets -Prevents accidental stem removal and isolates the packing from the process.


Data Sheet
HM56 Series Data Sheet
I & M
Manifold Valves Series I & M
Hex Condensed Catalog

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