A: It depends on your flow direction and space. Choose a silicone duckbill valve if you need axial flow (straight through) and high volume handling. Choose an umbrella check valve if you need a compact solution for pressure relief or venting where space is limited.

A: Yes. Beyond standard linear slits, we engineer tricuspid (3-way) and cross-slit configurations. We can fine-tune the cutting length of any silicone slit valve to achieve your desired flow rate and “drip-free” performance.

A: Our standard silicone check valves perform reliably from -60°C to +230°C (-76°F to 446°F), making them suitable for everything from frozen food dispensing to automotive engine compartments.

 A: While we specialize in custom molding, we do hold tooling for common sizes of rubber check valves. Please contact our sales team to check our current mold inventory list.

A: Cracking pressure is determined by a combination of material durometer (hardness), wall thickness, and the interference fit of the valve seat. For slit valves, the length and orientation of the cut also play a crucial role. We utilize FEA (Finite Element Analysis) to simulate these variables, ensuring your valve opens and seals at the exact PSI required.

A: While standard silicone is excellent for water, air, and food, it may swell when exposed to harsh chemicals or oils. For these cases, we offer Fluorosilicone (FVMQ) or FKM (Viton). These materials retain the elastomeric benefits of a valve while providing superior resistance to hydrocarbons and acidic environments.

A: A linear slit is ideal for simple one-way flow. However, a Cross-Slit (X-cut) provides better “suck-back” performance and drip-free shut-off, making it the industry standard for squeeze bottles (like honey or sauces) and precision medical dosing.

A: For valves, precision is everything. LSR molding is a closed-loop system that prevents contamination and produces “flash-free” parts with extremely tight tolerances (+/- 0.05mm). This ensures every valve has identical flow characteristics, which is critical for medical-grade respiratory or IV equipment.

A: Slit bonding (where the valve lips stick together) is a common failure. We prevent this by using specialized anti-bonding coatings, selecting low-tack silicone grades, or implementing secondary surface treatments like Parylene coating to ensure the valve opens reliably even after months of inactivity.

A: Our medical silicone valves are produced in an ISO Class 7 cleanroom. We use raw materials that are USP Class VI and ISO 10993 certified, ensuring they are biocompatible, non-hemolytic, and safe for long-term contact with human tissue or sensitive fluids.

A: Cycle life depends on the “flex fatigue” of the material. Our high-tear-strength silicone can typically withstand over 1 million cycles depending on the pressure and frequency. We conduct accelerated aging and fatigue testing to provide you with an estimated lifespan based on your specific use case.

A: Yes. Silicone is naturally resistant to high temperatures. Our valves can be sterilized via Autoclave (steam), ETO (Ethylene Oxide), or Gamma radiation without losing their physical properties or sealing integrity.

A: Most of our valves (especially Umbrella and Duckbill types) feature a “pull-through” or “snap-fit” design. We provide clear housing dimension guidelines (groove depth, seat diameter) to ensure the valve is properly pre-loaded for a perfect seal.