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Maric’s Flow Control Valves protect pumps, filters, pump glands, and water distribution systems that are flow-rate sensitive from fluctuations in pressure. They maintain a constant pre-set flow rate regardless of pressure differential within a typical 1.4–10 bar range upstream or downstream of the valve.

The screwed type valves are used in space-constrained applications as the valve’s diameter is only marginally larger than the pipe’s. They may require a barrel union for fitting and removal in especially small spaces.

The wafer type valves have an orifice plate and are usually chosen for larger installations. Easy to refit, they’re fitted with O-rings for a tight seal. This type is suited for smooth-faced flanges while cast or rough flanges may require flange gaskets.

Both types come with control rubbers that responds automatically to fluctuations in pressure. They’re capable of automatic and self-cleaning operation. They’re also more compact than conventional diaphragm valves.

Maric Flow Control Valves are used for mechanical seals of slurry pumps, gland water flow control, and flow control of liquids in mineral processing. They have a service life of up to 20 years.

Technical specifications





Size range

Screwed: 6–50mm
Wafer: 25–300mm

Pressure differential range

1.4–20 bar (standard)
Max 15 bar for N6 and EP rubbers only

Material specifications

Body (screwed)

303 and 316 stainless steel

Body material (wafer)

Leaded gunmetal
316 stainless steel

Control rubber/O-ring and temperature range

Nitrile (60°C)
EPDM (100°C)
Viton (200°C)

How we help you choose the right valves:

1. Tell us what you need

Talk to our experts about your application, which valves and controls you need, and any repair or maintenance concerns.

2. Choose the right solution

We’ll do all the analysis, discuss the options with you, and make a recommendation—the valves we’d choose in your shoes.

3. Get the job done

Get the right valves for the job, fitted out, tested, and ready to install. We’ve got your back with ongoing repairs and maintenance.

Talk to a valve specialist

Got questions? Need advice? Our valve specialists can give you practical advice to help you get on with the job.

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