Masonry Magazine August 2016 Page. 34
MIXERS, PUMPS AND DELIVERY SYSTEMS
manufacturers may have to limit the overall aggregate percentage, whil e maximizing cement and compressive strength of the material, in order to make a pumpable mix for a ball�check system. Ball-check pumps are generally very good at handling a high�
Material Valve -Ball Check
slump material, cement slurry, mortar or high-strength grout containing 3/8-inch (9.5-mm) aggregates.
Bottom line: the ball-check design is suited to medium to high production and works best with fine aggregate mixdesigns.
Another design used for specific masonry projects, the rotor/stator pump, offers a solution for lower-production jobs. This design is also called a "worm pump" or "moyno;' based on the original U.S. manufacturer's trade name. It includes a rotor made ofalloy or stainless steel shaped like a drill bit. The rotor is placed inside a molded stator made of polyurethane, designed to encapsulate the rotor while leaving enough space for rotation. The rotor/stator design provides a continuous, smooth flow of material without
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Ball-check Valve Pump Discharge
Ball-check Valve Pump in Tennessee
pulsation. It can receive material from a hopper mounted over it. Normally, the hopper has a large cutout in the bottom called an "open throat;' which allows material to freely enter the rotor. Because of the small space between the rotor and stator and the susceptibility to wear, these designs have very strict limitations on aggregates. Most of these pumps are not able to handle over 1/8-inch (3-mm) particle sizes. Rotor/stator production rates are well below the average outputs of S-tube and ball-check pumps. Still, these pumps have their place for lower-production jobs, such as tuck pointing, mortar spray and other void-fill requiring a precise, smooth flow ofmaterial.
Bottom line: rotor/stator designs can provide a contin�uous fl.ow of grout without aggregates.
Material delivery systems offer a simple yet efficient valve design. They consist of an auger that continuously feeds grout from a large-ca�
Material Valve -Rotor-Stator
pacity hopper to the dis�pensing hose. Delivery systems are elevated above the masonry wall and use the force of gravity to move grout through the dis�pensing hose into the CMUs. These systems
Rotor-Stator Pump
essentially take the
32 I MASONRY � August 2016 � www.masoncontractors.org The Voice of the Masonry Industry