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. Material pressure upon the valve forces the diaphragm to allow material through the fluid body and out the dispensing tip. Applying air pressure to the top of the diaphragm forms a seal, thus, closing off the valve. Diaphragm valves generally have a low number of moving parts and are often used to dispense low viscosity fluids including cyanoacrylates (superglue).

Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element.  Instead of pinching the liner closed to provide shut-off, the diaphragm is pushed into contact with the bottom of the valve body to provide shut-off. Diaphragm valves are excellent for controlling the flow of fluids containing suspended solids and offer the flexibility of being installed in any position.  These types of valves have found widespread use in the pharmaceutical, food processing, and water treatment industries.

Single component diaphragm valves may dispense aerobic cured materials.  Aerobic cured materials cure when exposed to air.  They also may dispense anaerobic cured materials.  Anaerobic cure materials cure when not exposed to air. The material temperature is the range of temperature that the valve can withstand and still function properly.  This relates to the media being transported, not the ambient or operating temperature outside of the system.

Applications

Many applications use single component diaphragm valves. Applications include adhesive and silicones, chemicals, cleaners and sanitizers, coatings or paints, colorants, clean rooms or laboratories, flux or solder, foaming or gasketing, food and beverage, fuel, high viscosity liquids, lubricants, and medical or pharmaceutical applications. Single component diaphragm valves may also be used in other applications as well. 

Specifications

Specifications to consider when selecting spray valves include spray width / diameter, dispense rate, shot size, shot size, operating frequency, media viscosity, and material temperature range.