CompactBellows_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
Compact Bellows Metering Pumps
Product Overview
Gorman-Rupp Industries’ line of Compact Bellows Metering Pumps were specifically designed for metering applications
requiring low discharge pressures. Compact
pumps have been successfully applied in photo, X-ray and dental film processors;
silver recovery; and scientific and analytical instruments.
The compact bellows
pumps utilize GRI’s proven bellows and valving technology to provide an accurate and economical
metering pump with long life. The proprietary blended polypropylene materials of construction and a wide selection of
valve and O-ring elastomers produce chemical resistant
pumps capable of handling a wide range of fluids.
Compact Bellows Metering Pump Operation:
The Compact 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 four 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.
Any combination of ½”, ¾”, 1”, 1-1/2” and 2” bellows may be used in a
pump. However, the total output must be limited to
a maximum flow rate of 3000 ml/min.
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
pump 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.
