Valve Selection for Selective Robotic Conformal Coating

Correct valve selection for selective conformal coating is critical to achieving a reliable, repeatable robotic coating process. The right valve choice directly impacts coating quality, cycle time, and overall performance.

Why Valve Selection Matters in Selective Coating

The valve is the heart of a robotic conformal coating system. It controls how material is applied, how consistent the process is, and whether the results meet industry reliability standards. Poor valve selection can compromise coverage, create defects, or slow down throughput.

Valve Types for Selective Conformal Coating

  • Airless Spray Valves (Film-Coat) – Fastest for low-viscosity solvent-based coatings. Sensitive to viscosity shifts and prone to splashing if not controlled. Requires a very stable platform due to the high speed nature of the system.
  • Atomised Spray Valves (LVLP / HVLP) – Add air for a controlled spray pattern. LVLP handles higher viscosities, HVLP provides for lower viscosities but there is less pattern definition compared to airless valves.
  • Dispensing Valves (Needle & Contactless) – Apply precise dots, lines, or controlled fills. Best for small features or viscous coatings, though generally slower.

Key Factors in Valve Selection

  • Durability: Stainless steel fluid paths resist corrosion and extend service life.
  • Design: Simple, robust, and easy to repair with minimal spare parts.
  • Sealing: Reliable tip-seal designs minimise leaks and clogging.
  • Performance: Consistent results even with viscosity changes, pressure shifts, and different coating chemistries.

Modern PCBs often require two or more valves on a single system to balance speed, precision, and material compatibility.

Training & Support on Selective Coating Valves

SCH provides training and consultancy to help engineers and technicians optimise selective conformal coating. We teach how to choose, set up, and maintain valves, as well as troubleshoot coating issues and improve throughput.

Explore Training on Robotic Coating →

Why Choose SCH Services?

Partnering with SCH Services means more than just outsourcing — you gain a complete, integrated platform for
Conformal Coating, Parylene & ProShieldESD Solutions, alongside equipment, materials, and training, all backed by decades of hands-on expertise.

  • ✈️ 25+ Years of Expertise – Specialists in coating technologies trusted by aerospace, medical, defence, automotive, and electronics industries worldwide.
  • 🛠️ End-to-End Support – Guidance on coating selection, Parylene grades, masking strategies, application methods, inspection, and ProShieldESD integration.
  • 📈 Scalable Solutions – From small prototype batches to full-scale, high-volume production, SCH delivers flexible capacity that grows with your needs.
  • 🌍 Global Reach – Responsive technical support and supply coverage across Europe, North America, and Asia.
  • ✅ Proven Reliability – A strong reputation built on quality, consistency, and customer satisfaction across services, equipment, and materials.

📞 Call: +44 (0)1226 249019
✉ Email: sales@schservices.com
💬 Contact Us ›