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Bellows_Metering_Product_Overview 01/18/11
180 Hines Ave. • Bellville, OH 44813 • PH: 419-886-3001 • FAX: 419-886-2338 • GRIsales@GRIpumps.com • www.GRIpumps.com
TIGHTEN TO 26-28
IN. LBS. TORQUE
TIGHTEN TO 18-20
IN. LBS. TORQUE
1.50
30°
.75
CONNECTORS
D.-.28 O.D.
6.71
6.88
.19 WIDE MTG.
SLOT 2 PLCS.
1.46
2.92
7.46
TIGHTEN TO 12-14
IN. LBS. TORQUE
.43
4.99
1.47
RoHS
TEST SAMPLE
Bellows Metering Pumps
Product Overview
Bellows metering
pumps operate on a positive displacement principle. Pumps are
designed to displace both corrosive and noncorrosive fluids. Accurate to ± 0.5%
from stroke to stroke, when
pump is set 50% to 100% of full stroke. Discharge
pressure is maintained over the entire flow range of the
pump. Poppet valves are used to prevent back flow; and
springs are available to provide a positive shutoff, preventing siphoning through the
pump in applications where
a positive suction head exists.
Typical applications include film and x-ray processors, silver recovery systems, wafer and silicon chip washers
and processors, detergent dispensers, blood analyzing equipment, industrial floor scrubbers, thermo therapy
equipment, waste removal systems, and wastewater and water treatment systems.
Bellows Metering Pump Operation:
The Bellows Metering Pumps operate on a positive displacement principle. The rotation of the motor shaft is
transmitted into an up and down motion through a lever pivot crank mechanism. This motion provides a continuous
squeezing and relaxing force on a bellows module, forcing fluid in and out of the module. Discharge pressure
is maintained over the entire flow range of the
pump.
Optimum Operating Conditions:
Optimum operating conditions consists of a 6” minimum suction lift and a discharge head of not less than 6”.
Pumps must be mounted vertically with the valve body at the top to obtain maximum metering accuracy.
Flow Rates:
The flow rate of each bellows module is regulated by three factors:
1. Diameter of the bellows,
2. Speed of the gear motor,
3. Adjustment of the module stroke length.
Bellows are available in several different diameters. The full stroke displacement and discharge pressure of the
pump is dependent on the size of the bellows as shown below:
Size 1/2” 1” 11/2” 21/2”
STD
2 1/2”
BOJ
Full Stroke
Displacement in ml .5 5 10.5 55 27.5
Maximum Discharge
Pressure (psi) 50 40 20 5 5
BOJ - BEL O JUSTTM STD - Standard
