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Bleach Compatible Mini Bellows Metering Pumps

Bleach Compatible Mini Bellows Metering Pumps are ideal for low flow, low pressure metering applications where bleach is the fluid being pumped. 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.

Bleach Compatible Mini Bellows Metering Pump Operation:
The Bleach Compatible 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 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 located above right.

Bellow Metering Pump 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”, 1-1/2” and 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 Mini Bellows Metering Pump Specifications:
Average Repeatability — From stroke-to-stroke ± 0.75%
Flow Rates — Range to 270 ml/min, Tandem models range to 432 ml/min
Max Fluid Temperatures — To 140°F (60°C)
Max Discharge Pressure — To 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. Duckbill valves are recommended for heavy slurries or fibrous materials (Please consult factory for Bleach Compatible duckbill requirements). Heavy slurries should be flushed from the pump before shutdown.

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:
The standard motor available for the Mini Bellows Pump is an AC voltage synchronous motor. Motors are UL recognized and continuous duty rated and are available in 115V, 50/60 Hz or 230V, 50/60 Hz.

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

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

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 synchronous motor speeds are 8, 12, 15 and 24 RPM at 60 Hz. Shaded pole motor speeds can be supplied in virtually any speed up to a maximum of 90 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. Designs The standard motor is an AC voltage synchronous motor. Depending on the type of mini bellows metering pump, the following motor types are available: shaded pole, stepper and DC.

Poppet Valves and O-Rings

The standard elastomers for the poppet valves and O-rings are Viton.

Duckbill Valves and O-Rings

Duckbill valves are required in those applications where heavy slurries or fibrous materials are being pumped. Heavy slurries should be flushed from the bellows before pump is shut down. Please consult factory for Bleach Compatible Duckbill Valve requirements.