Date:
July 9, 2010
Subject:
Beverage Gas Pump 166-269-XX
INTRODUCTION
SHURflo’s Beverage Gas Pump supplies syrup under pressure to a post-mix dispenser’s valve,
which mixes the syrup with water to an exact ratio (brix). The pump is used in conjunction with
non-pressurized Bag-In-Box (B-I-B) containers and a bag connector (Q.D.) fitting. The pump
can be operated on regulated CO2, nitrogen or compressed filtered air. The compressed gas
drives the pump and is not in contact with the syrup. Separate syrup and gas chambers prevent
contamination, foaming and purging of the tubing when the B-I-B has emptied.
The pump retains pressure in the outlet line, operating only when syrup is needed. When the
dispenser valve is opened, the pump reacts to the pressure drop by operating to maintain
pressure in the line. When the dispenser is closed, the incoming gas and output syrup
pressures equalize and the pump stops. Actual dynamic line pressure is dependant upon
system losses as outlined in the section "Pumping Capability".
The automatic "sold-out" feature within the pump ensures consistent syrup delivery right up to
the moment the B-I-B is empty. Vacuum produced by the pump evacuates the syrup within the bag. Once the preset vacuum
point is achieved, upon bag evacuation, incoming gas pressure to the pump is shutoff causing the outlet syrup pressure from
the pump to drop to zero. When a new B-I-B is installed, the vacuum drops, the pump automatically restarts and pressurizes the
system. The SHURflo Beverage Gas Pump ensures quality from the first drink to the last.
APPLICATION INFORMATION
Beverage Gas Pumps are intended for soda syrups and low viscosity concentrates that do not contain solids. The use of a
SHURflo Juice Pump (-09) is recommended for concentrates containing soft solids, classed as round, up to 0.025 in.
[0.6 mm] or that are of higher viscosity than soda syrups. When concentrates contain pulp classed as long/stringy, seed
particles or are exceptionally viscous, the Particulate Juice Pump (-10) should be used as it can handle soft solids up to 1/4" [6
mm] cubed. Standard gas pump models are for installations where geographic elevation is less than 5000 ft.[1523 m]. For
elevations above 5000 ft. specific high altitude models with a reduced sold-out spring rate must be used to compensate for the
loss in atmospheric pressure. For further application and model information please contact SHURflo.
PUMPING CAPABILITY
The distance syrup can be delivered is limited by inherent factors (restrictions) within the inlet & outlet sides of the beverage
dispensing system. Due to variances in system configuration and equipment, an accurate determination of pressure drop is
difficult. Before deciding on a system’s tubing size, SHURflo recommends estimating system losses by considering the
following:
•
Syrup viscosity and temperature (coldplate, re-circ., etc.).
•
Total syrup flow rate of valve(s) connected to a pump.
•
Inside diameter of the inlet/outlet tubing, fittings, bag connector, etc.
•
Horizontal & vertical distance of the outlet tubing.
Vertical tubing runs will reduce total achievable tubing run length. To estimate the losses within the vertical distance, use the
chart to the right. Take 1% of the distance in feet [3% if meters]. The resulting number is multiplied by the vertical distance. This
product is then subtracted from the maximum horizontal distance. The resulting length is the total horizontal/vertical (horz./vert.)
tubing run that is obtainable for that flow rate, tubing I.D. and viscosity.
