Specifications
| Item | Detail |
|---|---|
| Material | AISI 316L, 17-4PH (H900 / H1025), AISI 420 |
| Process | Silica sol lost wax investment casting; solution annealing for 316L; H900/H1025 for 17-4PH |
| Dimensional tolerance | ISO 8062 CT4-CT6 as cast; seal bore and thread machined to +/- 0.02 mm |
| Surface finish | Ra 3.2-6.3 um as cast; electropolished to Ra 0.4 um; passivation per ASTM A967 |
| Machining | 5-axis CNC, internal flow path, seal seat, luer and thread forms, deburring, ultrasonic cleaning |
| Weight range | 0.03 kg – 0.28 kg per piece |
| Inspection & certificates | CMM, XRF alloy check, dye penetrant, pressure or leak test support, EN 10204 3.1, PPAP/FAIR on request |
Key features
- We core the net shape internal valve chambers and flow paths during casting. The housing therefore needs no weldments or brazed joints that could trap soil.
- 316L low carbon chemistry resists pitting and crevice corrosion through repeated autoclave cycles and saline exposure.
- Moreover, we finish machine the seal seat flatness and thread form on 5-axis equipment. This gives repeatable valve closure and stable insufflation pressure.
- Electropolishing after passivation lowers the surface energy of the gas path, which helps prevent biofilm retention and eases cleaning validation.
- We confirm burr free internal edges by borescope inspection before the part leaves the machining cell.
Applications
- Valve housings for reusable and single use laparoscopic trocars
- Insufflation valve bodies and stopcock assemblies
- Generally, Seal housings for 5 mm, 10 mm and 12 mm trocar cannulae
- Endoscopic instrument gas and fluid control bodies
- Minimally invasive surgical access system components
Quality & compliance
Moreover, Ningbo Ruican holds IATF 16949 and ISO 9001 certification. Each delivery carries EN 10204 3.1 material
certificates tying the finished housings to the melt analysis, mechanical test results and heat treatment
record, and PPAP or FAIR packages are compiled on request for new programs. Full heat-lot traceability is kept
from melt to final pack, including passivation and electropolishing batch records. Honest scope statement:
Ningbo Ruican is not an ISO 13485 contract manufacturer; it supplies project-level ISO 13485 documentation
under the customer’s Quality Agreement, covering 17-4PH H900/H1025, AISI 420 and AISI 316L with ISO 10993-5
support. Device level regulatory clearance and sterilization validation stay with the device manufacturer.
FAQ
Why choose 316L over 17-4PH for a trocar valve housing?
316L is selected for reusable housings that see aggressive cleaning agents and autoclave cycles, because the low
carbon molybdenum bearing alloy resists pitting. 17-4PH H900 is used when the housing needs higher strength or
wear resistance at a moving valve element, with the trade off of slightly lower corrosion resistance.
Can you cast the internal flow path?
Yes. Soluble core and ceramic core techniques are used to cast internal chambers and gas paths in one piece,
which avoids assembly joints and reduces the number of leak paths in the finished device.
Do you verify the seal seat after machining?
Every production lot is checked on a CMM for seal seat flatness, bore diameter and thread geometry, and the
results are reported in the inspection document shipped with the lot.
What surface roughness can you achieve inside the valve chamber?
Generally, as-cast surfaces are Ra 3.2-6.3 um. In general, electropolishing reduces the exposed internal surfaces to about Ra 0.4 um.
Do you support cleanroom packaging?
Cleanroom-compatible packaging with double bagging, lot labelling and particulate control documentation is
available on request.
Send your drawing or sample for a quotation – Wendy She — sales@cnsandcasting.com — WhatsApp +86-13777124360
