This is a 100% Genuine, Made-in-Japan Mimaki SIJ One-Way Check Valve, engineered specifically for Mimaki industrial wide-format inkjet and UV flatbed printers. It is a critical component within the ink supply and negative pressure sub-ink tank system, ensuring stable fluid dynamics, precise pressure maintenance, and absolute prevention of ink backflow.
Key Part Numbers & Compatibility
Part Numbers: MP-Q301791 / 209TAPK / MP-Q301584
Compatible Mimaki Models:
UV LED Flatbed / Roll-to-Roll Printers: JFX200-2513, JFX500-2131, UJV500-160
Grand Format Solvent Printers: SIJ-320UV, SWJ-320
High-Speed Textile Printers: TS500-1800 SB
Key Features and Functions
1. Absolute Backflow Prevention (Non-Return)
Operating as a black, open-pressure non-return valve, it allows fluids (ink or air) to flow in only one direction. This prevents ink from flowing backward into the air channels or sub-tanks, effectively eliminating the risk of color mixing, cross-contamination, and printhead damage.
2. Negative Pressure & Flow Stabilization
Equipped with a highly sensitive internal spring and diaphragm mechanism, the valve opens only when the required threshold pressure is met. This maintains a perfectly balanced negative pressure between the sub-tank and the printhead during high-speed carriage movement, ensuring a smooth, consistent ink flow.
3. Anti-Dripping & Anti-Clogging Guard
When the printer is in standby, cleaning, or capping modes, the valve tightly seals the ink path. This counteracts gravity to stop ink from dripping onto the media, and prevents air from getting sucked back into the printhead channels, which causes nozzles to drop out.
4. Light-Blocking & Chemical-Resistant Build
UV-Resistant Opaque Housing: The black housing blocks ambient and curing light completely, preventing UV inks from curing inside the valve.
Premium Industrial Materials: Made with high-density, chemical-resistant polymers and Fluororubber/Teflon seals. It withstands continuous exposure to aggressive Eco-Solvent, Solvent, and UV-curable inks without swelling, cracking, or degrading.
Technical Specifications
Type: Industrial Fluid Control Check Valve
Color: Opaque Black (Light-Shielded)
Origin: Japan (Genuine Mimaki Original Equipment Manufacturer Part)
Check valves are precision consumables that wear out over time. If you notice any of the following symptoms, immediate replacement is recommended to safeguard your printheads:
Color Cross-Contamination: Colors bleeding into adjacent nozzles while the printer is idle.
Ink Dripping: Ink pooling on the printhead surface or dripping onto media during standby.
Purge/Suction Issues: Difficulty drawing ink through the printhead during cleaning cycles, often caused by an internal air leak in a failing valve.
english
français
Deutsch
Italiano
Русский
Español
português
Nederlandse
ελληνικά
日本語
한국
العربية
हिन्दी
Türkçe
indonesia
tiếng Việt
ไทย
বাংলা
فارسی
polski
