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Bleach Compatible Compact Bellows Metering Pumps

Gorman-Rupp Industries’ line of Bleach Compatible Compact Bellows Metering Pumps were specifically designed for metering applications requiring low discharge pressures where bleach is the fluid being pumped.
The compact bellows pumps utilize GRI’s proven bellows and valving technology to provide an accurate and economical metering pump with long life.

Bleach Compatible Compact Bellows Metering Pump Operation:
The Bleach Compatible 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.

Optimum Operating Conditions:
Optimum operating conditions consist 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. 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 located above right.

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.

Bellow Metering Pump Flow Adjustment:
The ½” and ¾” bellows modules can be adjusted to 20% of maximum stroke length, while 1” and 1-1/2” bellows modules can be adjusted down to 10% of maximum stroke.

Note: Best priming and metering accuracy occurs when the stroke length is 50% or greater.

Standard Crank — Adjustment cannot be made while pump is operating. An adjusting screw changes the stroke length of an eccentric crank.

Bleach Compatible Compact Bellows Metering Pump Specifications:
Flow Rates — Range from 3.8 ml/min to 945 ml/min
Max Fluid Temperatures — To 140°F (60°C)
Max Discharge Pressure — 5 psi

Note: Reduce pressure rating by 50% for fluid temperatures over 120°F (49°C).

Viscosity/Slurries — Maximum fluid viscosity is 5,000 centistokes. Poppet valves can handle fine slurries.

Note: All testing is done with water at an ambient temperature of 80 degree F. If specific gravity or viscosity of fluid being pumped is significantly greater than water (1.0), please consult factory.

Gearmotors:
Catalog gearmotors are available in 115V, 50/60 Hz or 220V, 50/60 Hz. Standard motor speeds are 45.6 and 90 RPM at 60 Hz and 38 and 75 RPM at 50 Hz. Motors are UL recognized and continuous duty rated with a minimum life expectancy of 2000 hours. Perpetual running of motor is not recommended. If a non-stop application is encountered, the Gorman-Rupp Industries Heavy-Duty Bellows Metering Pump is recommended.

Materials in Contact with Solution:
Connectors — HDPE
O-Rings (Elastomers) — Viton®/Fluoroelastomer
Poppet — Viton®/Fluoroelastomer (Please consult factory for Bleach Compatible duckbill requirements)
Bellows — TPE

Bleach Compatible Compact Bellows Metering Pump Selection:
To choose the correct pump specifications for your needs click here to download a guide.

Features
•	Average repeatability from stroke-to-stroke, ±0.75%	•	Dry run capability
•	Self-priming	•	No dynamic seals
•	Superior corrosion resistance	•	Economical
•	Simple flow adjustment

OEM Options

Motors

Speeds Standard motor speeds are 45.6 and 90 RPM at 60 Hz. Motors can be supplied in virtually any speed up to a maximum of 120 RPM. Voltages Standard voltages are 115V, 50/60 Hz, or 230V, 50/60 Hz. However, the following special voltages are also available: 12 and 24VDC, or 24VAC. Designs The standard motor is an open, shaded pole gearmotor. Motors are also available in steppers, and DC.

Options

Motors can be supplied with microswitches for stroke counting and cork brakes. Units without motors (pedestal models) are also available on some models.

Miscellaneous Options

Other options available for the compact bellows pumps include duckbill valves, miniature switches to count strokes, stainless steel mounting brackets and splash covers.

Poppet Valves and O-Rings

The standard elastomers for the poppet valves and O-rings is Viton®/Fluoroelastomer.

Valve Bodies

Standard valve body on the 1/2” & 3/4” compact pump is a 90° valve body. Standard valve body on the 1” & 1-1/2” compact pump is a T-head valve body.

Pump Covers

In addition to the standard options, cover options can also include different wire or cord lengths and terminations, strain reliefs and ground wires.