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MiniBellows_Product_Overview 01/17/11
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
Mini Bellows Metering Pumps
Product Overview
Mini Bellows Metering Pumps are ideal for low flow, low pressure metering applications. The
pump is constructed entirely
of plastic and uses GRI’s time-proven bellows technology to provide an accurate chemically-resistant metering
pump with
a long life, at an economical price.
Mini Bellows Metering Pump Operation:
The Mini Bellows Metering Pumps operate on a positive displacement principle. The rotation of the motor shaft is transmitted
into an up and down linear motion through an adjustable concentric crank mechanism. This motion provides a
continuous compressing and relaxing force on the bellows module, forcing fluid between two check valves located in the
module’s valve body. Up to two separate bellows modules can be operated by single motor for proportioning up to four
separate fluid mediums. The flow rate of each module is independently adjustable. Multiple bellows modules operate outof-
phase with each other for most efficient power usage.
Optimum Operating Conditions:
Optimum operating conditions consist of a 6” minimum suction life 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. For conditions where a positive
suction head condition exists, an anti-siphon spring or anti-siphon spring kit can be added to aid the poppet valve seal
properly during operation. See Accessories PDF file located in the Product Resources section of the GRI website.
Flow Rates:
The flow rate of each bellows module is regulated by three factors:
1. Diameter of the bellows,
2. Speed of the gearmotor,
3. Adjustment of the module stroke length.
The full stroke displacement and discharge pressure of the
pump is dependent on the size of the bellows as shown below.
If higher discharge pressure pressure is required, please consult factory for an OEM solution.
BLEACH COMPATIBLE COMPACT BELLOWS MODULE FLOW RATE CHART
Bellows Size 1/2” 3/4” 1” 11/2” 2”
Full Stroke
Displacement (ml) .5 1.8 5 10.5 18
Max Discharge
Pressure (psi) 5 5 5 5 5
Motor RPM
Max Flow per Module (ml/min)
50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz
8 3.3 4.0 12.0 14.4 33.3 40.0 70.0 84.0 120.0 144.0
12 5.0 6.0 18.0 21.6 50.0 60.0 105.0 126.0 180.0 216.0
15 6.2 7.5 22.5 27.0 62.5 75.0 131.3 157.5 225.0 270.0
24 10.0 12.0 36.0 43.2 100.0 120.0 210.0 252.0 — —
