Precision Dispensing Needle Valves Information
Precision dispensing needle valves are designed to provide precise fluid dispensing depending on applications. The dispensed output can be in the form of a bead, dot or fill. The valve dispenses fluid when the activator (for example, air) acts on a piston, which shifts the spool or needle into the open position. A second actuator (for example, fluid pressure) forces the fluid to flow. When the valve activator is stopped, a spring force shifts the spool or needle to the closed position.
Dispensing needle valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow. Fluid flowing through the valve turns 90 degrees and passes through an orifice that is the seat for a rod with a cone shaped tip. Precision dispensing needle valves are widely used to accurately regulate the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow.
Dispensing needle valves are used to control flow into delicate gauges, which might be damaged by sudden surges of fluid under pressure. Needle valves are also used in situations where the flow must be gradually brought to a halt and at other points where precise adjustments of flow are necessary or where a small flow rate is desired. They can be used as both on/off valves and for throttling service.
Precision dispensing needle valves can be used for a range of applications, including adhesive/silicone, chemical, cleaners, paints and coatings, food and beverage, high viscosities, and lubricants. Many additional applications for precision dispensing needle valves are also available. Important specifications to consider when choosing precision dispensing needle valves are dispense rate, dispensed width or diameter, shot size, operating frequency, and metering accuracy.
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Dispensing Valve Systems
Dispensing valve systems are designed to provide precise fluid dispensing depending on applications. The dispensed output can be a bead, dot, flat spray, round spray, or fill (potting). The type of dispensing pattern from dispensing valve systems is determined by valve design and is dependent on dispensed fluid properties.
Positive Displacement Valves
Positive displacement valves are precision dispensing devices designed to provide precise fluid dispensation depending on applications. They function by opening quickly, releasing product, and closing again.
Single Component Diaphragm Valves
Single component diaphragm valves are designed to provide a precise fluid supply depending on the application. The dispensed output can be a bead, dot or fill
Spray valves are precision dispensing valves designed to provide precise fluid dispensation depending on applications. The dispensed output can flat or round. Dispensed product is sprayed onto target area, rather than placed directly on it.