Food-Grade and Medical-Grade LSR
Many dispensing and medical access valves use silicone or LSR in the 30 to 40 Shore A range to balance easy opening with reliable elastic closure.
Custom Silicone Cross-Slit Valves
Self-sealing silicone dispensing valves for controlled flow, drip prevention, access ports, and repeatable open-close performance.
- Custom slit pattern, diaphragm thickness, hardness, and opening force
- Food-grade, medical-grade, and application-specific elastomer options
- Precision slit cutting and custom dome or flat diaphragm design
What Is a Cross-Slit Valve?
A cross-slit valve is a self-closing flow-control valve made by cutting intersecting slits into a flexible elastomer diaphragm. The diaphragm is usually a flat or dome-shaped silicone membrane.
At rest, the elastic cusps remain in contact and close the opening. Applied pressure, squeezing, or instrument insertion opens the slit. When the load is removed, the cusps recover and close again. Compared with a narrow linear duckbill slit, a cross-slit design can provide a larger instant flow opening and can also be designed for dispensing or access functions.
Cross-Slit Valve Materials
Material stiffness and recovery directly affect opening force, self-sealing behavior, tear resistance, slit life, and sterilization or media compatibility.
FVMQ, EPDM, NBR and CR
Alternative elastomers can be selected when oil resistance, weather resistance, chemical resistance, or other application-specific properties are more important.
Types of Cross-Slit Valves
Slit count, diaphragm shape, application type, and mounting geometry can all be adjusted to tune flow, sealing, opening force, and assembly.
Slit Pattern
I, Cross, Y and Multi-Cusp Slits
Single, cross, Y-shaped, and four-cusp patterns can be selected around the required balance of flow area and sealing force.
Diaphragm
Flat or Dome Diaphragm
A dome profile can distribute deformation more evenly and provide more stable sealing force in applications that need consistent closure.
Dispensing
Dispensing Valve
Used in squeeze packaging to release product under pressure, stop flow quickly when pressure is removed, and reduce dripping or contamination.
Medical Access
Self-Sealing Access Valve
Designed to allow repeated needle or instrument insertion and then close after withdrawal to restore the sealing barrier.
How Does a Cross-Slit Valve Work?
The valve relies on elastomer recovery to keep the slit closed until pressure or mechanical insertion forces the cusps apart.
Cusps Seal at Rest
The slit edges remain in contact under normal conditions, blocking fluid flow and helping isolate the inside of the system from outside contamination.
Pressure Opens the Cross Slit
Squeezing a container or applying sufficient pressure pushes the cusps outward and creates a larger temporary flow opening.
The Diaphragm Self-Seals
When pressure is released or an instrument is removed, the silicone recovers and the slit edges return to contact.
Cross-Slit Valve Manufacturing
Cross-slit valves are generally made in two stages. First, LSR injection molding or silicone compression molding forms the flat or dome-shaped diaphragm. Precision cutting or punching then creates the slit pattern in the membrane.
Slit quality is a critical control point. Cutting position, angle, wall thickness, tool condition, and anti-sticking treatment all influence symmetry, opening consistency, sealing, and long-term resistance to slit healing.
Cross-Slit Valve Performance
Opening behavior is mainly controlled by slit geometry, diaphragm thickness, material hardness, and the elastic recovery of the molded membrane.
| Property | Typical Guidance | Design Meaning |
|---|---|---|
| Hardness | Commonly 30 to 40 Shore A | Softer material lowers opening force, while higher hardness can improve closing force but increase actuation pressure. |
| Diaphragm Thickness | Application-specific; tight thickness control recommended | Thicker diaphragms generally need more force to open and can provide stronger sealing. |
| Slit Depth | Design guidance may use about one-third to two-thirds of membrane thickness | Insufficient depth can restrict opening, while excessive depth can weaken tear resistance and self-sealing. |
| Temperature Range | Silicone designs commonly target about -40°C to 230°C | The final limit depends on the silicone grade, media, sterilization, and service conditions. |
| Functional Testing | Leak and opening tests can be defined for the final application | Dispensing and medical programs often need tighter lot-to-lot control of slit closure and opening behavior. |
How to Ensure Reliable Sealing and Dispensing
A cross-slit valve should be designed as a complete system that includes slit geometry, diaphragm stiffness, material recovery, and anti-sticking control.
Slit Count and Angle
Select the slit pattern around flow and sealing needs. Symmetry and cutting position directly affect whether each cusp opens evenly.
Wall Thickness and Slit Depth
Thicker membranes increase opening force. Slit depth should allow full movement without weakening the diaphragm or reducing tear life.
Material Hardness
Very soft material opens easily but may reduce sealing force or durability. Hardness should be matched to actuation pressure and target cycle life.
Slit Healing and Anti-Sticking
Medical access valves may require self-lubricating LSR or a controlled slit treatment to reduce the risk of slit surfaces bonding during storage or repeated sterilization.
Cross-Slit Valve Applications
Cross-slit valves are used when a product needs fast dispensing, self-closing flow control, or a flexible access opening that reseals after use.
Food and Beverage Packaging
Used in squeeze caps for sports drinks, sauces, honey, concentrates, and other products that need controlled dispensing and drip reduction.
Medical Devices
Used in needle-free connectors, trocar valves, drug-delivery access ports, and other self-sealing medical interfaces.
Personal Care and Cleaning
Used in shampoo, body wash, detergent, and other squeeze-dispensing closures that should stop cleanly when pressure is released.
Industrial and HVAC
Used in condensate drainage and metering or injection systems that need compact elastomer flow control.
Need a Custom Silicone Cross-Slit Valve?
Share your target flow, opening pressure, fluid, diaphragm size, slit pattern, life-cycle, and compliance requirements. Fecision can review the valve geometry and molding or slitting approach.