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HAM-LET® H-900HP High Pressure Relief Valve

The Ham-Let® H-900HP is a series of relief valves for high pressure service.

The valve is normally closed.

It will open when the system pressure reaches the set level. It will re-close when the system pressure fall below the set level.

Setting and Resealing Pressure

  • Upstream set pressure is the first indicator of flow process. Every pressure relief after the first is repeatable within a deviation of 5% at room temperature.
  • Blocked upstream set pressure is the first indicator of a stopped flow process and is always lower than the set pressure.


  • The H-900HP relief valve design has been tested for Proof and Burst.
  • Every valve is factory tested for proper set and resealing performance.

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