Adhesive / Silicone Precision Dispensing Needle Valves
Description
Adhesive/Silicone Precision Dispensing Needle Valves are specialized devices designed to accurately regulate the flow of adhesives and silicones. These valves feature a slender, tapered point at the end of the valve stem, which is lowered through the seat to restrict or block the flow of fluid. They are engineered to handle the relatively higher viscosities of silicone, ensuring precise control over the dispensation process.
Working Principle
The working principle of precision dispensing needle valves involves the use of a fine-threaded stem and a large seat area to provide precise resistance to flow. Fluid flowing through the valve turns 90 degrees and passes through an orifice that serves as the seat for a rod with a cone-shaped tip. This design allows for accurate regulation of low flow rates, making them useful for applications requiring precise adjustments of flow or where a small flow rate is desired. The ability to control flow into delicate gauges and gradually bring flow to a halt highlights their utility in maintaining system integrity and preventing damage from fluid surges.
Applications
Precision dispensing needle valves are used in a variety of applications, including the dispensing of adhesives and silicones. Specific examples include their use in the application of chemical cleaners, paints and coatings, food and beverage processing, and the handling of high-viscosity lubricants. These valves are also employed in situations where precise metering accuracy is critical, such as in the electronics industry for circuit board assembly and in medical product manufacturing for drug delivery systems.
Advantages over other Precision Dispensing Needle Valves
One of the key advantages of adhesive/silicone precision dispensing needle valves is their ability to handle higher viscosities without excessive wear on equipment surfaces, as silicone is less abrasive compared to other adhesive chemistries. This characteristic makes them particularly suitable for applications involving thick or viscous materials, where other types of valves might struggle or require more frequent maintenance.
Limitations
A specific limitation of these valves is their potential sensitivity to clogging when used with certain types of adhesives or silicones that may cure or harden quickly. This can lead to increased maintenance requirements to ensure consistent performance. Additionally, the precision nature of these valves may necessitate careful calibration and setup to achieve the desired flow rates and patterns.
Considerations
When considering the use of adhesive/silicone precision dispensing needle valves, it is important to evaluate initial costs, which can vary depending on the complexity and specifications of the valve system. Operating expenses may include the cost of regular maintenance to prevent clogging and ensure accuracy. Durability is generally high due to the robust design, but the accuracy of dispensation can be affected by wear over time, necessitating periodic replacement of components. Replacement and maintenance costs should be factored into the overall cost of ownership, especially in high-volume or critical applications where downtime can be costly.
from Nordson Corporation
Auto Flo extrude stand-alone, 1/4" ball & seat [See More]
- Application: AdhesiveSilicone; HighViscosity; Sealants
- Material Feed: Continuous Feed
- Dispensing Application: Bead; Spray Round (optional feature)
- Inlet Pressure Range: ? to 5000
from Cammda Corporation
CAMMDA Corporation provides a range of Dispensing Tips/Dispensing Needles - available to suit every dispensing requirement. Precision cut stainless steel for general purpose use, molded polypropylene and flexible polyethylene tips allow dispensing in the most restricted areas. Taper tips provide for... [See More]
- Application: AdhesiveSilicone
- Material Feed: Batch (Syringe)
- Dispensing Application: Dot
- Number of Components: Single Component
from Nordson EFD
The 741MD Series MicroDot ™ needle valve dispenses very precise micro-deposits down to fractions of a microliter. Pneumatically operated and adjustable, it delivers superior fluid dispensing control. Ideal for automated assembly processes, the 741MD-SS valve ’s adjustable needle stroke... [See More]
- Application: AdhesiveSilicone; Lubricants
- Material Feed: Batch (Syringe)
- Dispensing Application: Dot
- Number of Components: Single Component
from Cammda Corporation
CAMMDA Corporation provides a range of Dispensing Tips/Dispensing Needles - available to suit every dispensing requirement. Precision cut stainless steel for general purpose use, molded polypropylene and flexible polyethylene tips allow dispensing in the most restricted areas. Taper tips provide for... [See More]
- Application: AdhesiveSilicone
- Material Feed: Batch (Syringe)
- Dispensing Application: Dot
- Number of Components: Single Component
from Nordson EFD
The 741V Series needle valve design applies low viscosity assembly fluids with accurate, extremely close repeat deposit control. During operation, controlled pulsed air acts on the piston to withdraw the needle a preset distance from the needle seat to provide exact, repeatable fluid flow. The... [See More]
- Application: AdhesiveSilicone; Inks
- Material Feed: Continuous Feed
- Dispensing Application: Bead
- Number of Components: Single Component
from Cammda Corporation
CAMMDA Corporation provides a range of Dispensing Tips/Dispensing Needles - available to suit every dispensing requirement. Precision cut stainless steel for general purpose use, molded polypropylene and flexible polyethylene tips allow dispensing in the most restricted areas. Taper tips provide for... [See More]
- Application: AdhesiveSilicone
- Material Feed: Batch (Syringe)
- Dispensing Application: Dot
- Number of Components: Single Component
from Nordson EFD
Nordson EFD ’s Relius ™ line of portable fluid dispensers is easy to use and offer durable, fail-safe construction with less hand fatigue. Ideal for touchups, low-volume assembly, and field work, our handheld fluid dispensers are compatible with all Nordson EFD syringe barrels, pistons,... [See More]
- Application: AdhesiveSilicone; FluxSolder; Lubricants
- Material Feed: Batch (Syringe)
- Dispensing Application: Bead
- Number of Components: Single Component