Pocket_Bellows_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
Pocket Bellows Metering Pumps
Product Overview
Pocket Bellows Metering Pumps are the most economical
metering pump on the market while maintaining the
high quality standards of a Gorman-Rupp Industries product. PBMP line of bellows
metering pumps are ideal for
low flow, low pressure metering applications where a fixed flow rate is required.
Like the Mini Bellows Metering Pump line, the Pocket Bellows
metering pumps are 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. The only difference is the Pocket Bellows line utilizes a fixed crank mechanism.
Bellows Metering Pump Operation:
The Pocket 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 out-of-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 on GRI’s Pocket Bellows’ 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.
