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Through a vast amount of studying and tests, it was found that hardness differentiation can be achieved through special heat treatment developed for stainless steel: Not the complete valve, but only the needle undergoes the hardening treatment that makes it three times harder than the needle housing. When the needle is inserted under pressure, no scratching is caused because as needle material is harder than the base. This fully-compliant solution has been successfully proven for eliminating the issues associated with wear resulted from identical hardness (of needle and needle housing) or needle coating peeling.
Although this treating causes some discoloration to the material, it does not affect the needle functionality or hardness. This heat treatment thus provides an advanced solution which avoids a lot of the potential problems common with needle valves.
Fluid Management
A Continued Effort to Address the Emerging Challenges in Moving Liquids
* The author is VP Quality, Engineering and R&D of Ham-Let
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