Page 3 - Sprayhead Basics Brochure

FLOW RATE INTO THE FUNNEL
Typically the sprayhead is a regulator that sets the flow rate of water into the funnel and expanse of spray pattern over the funnel bed. This will dictate total water delivery time and how long the grounds or tea leaves will be in contact with water. The sprayhead design should be properly paired with the equipment to accommodate maximum flow rates of the machine. Daily cleaning of the sprayhead helps assist in maintaining proper flow.
HOLE CHARACTERISTICS AND SPRAY PATTERN
The quantity and placement of the holes will influence the spray pattern and angle of disbursement. This, then, determines location of water contact in the funnel and the number of contact points. It is essential the sprayhead deliver water evenly to the funnel bed. However, the spray pattern cannot be spread so far that it misses the grounds or tea leaves by directing water down the side of the funnel.
TURBULENCE
Turbulence is the mixing action in the funnel caused by water passing over, around and through the particles in the funnel. Its effectiveness is influenced by flow rate, spray pattern and spray angle. Evenly distributed turbulence action is key to uniform extraction and a smooth, rich taste.
CONSTRUCTION
A one-piece sprayhead may be convenient due to fewer parts, but a multiple piece sprayhead can be disassembled for thorough cleaning. Some sprayheads have a domed face to help with the angle of water dispersion. Others have a larger diameter to cover a large funnel diameter.
LIME TOLERANCE
Water used in the brewing process should have a controlled mineral profile; otherwise, final taste in the cup and machine performance will be adversely affected by scale build up and corrosion.
Larger sprayhead holes are generally considered the design of choice when lime tolerance is a factor because it takes more time to accumulate a build up on the water passage. The smaller the water passage, the quicker it can “lime up” – or become restricted by build up. Material also plays a role, as some plastics are more resistant to lime build-up than metal.
FACTORS OF SPRAYHEAD CONSIDERATION