BT-Maric Constant Flow Valves – Insert Type

BT-Maric constant flow valves of the Insert type are compact, cost-effective flow control components designed for easy integration into OEM equipment and high-volume production systems. They are intended to be press- or slip-fitted directly into existing housings or pipework.
These inserts deliver a constant, pre-set flow rate for water and similar media, regardless of fluctuations in system pressure. This makes them an ideal solution for manufacturers seeking to ensure flow stability in compact designs without the need for external regulation or adjustment.

Inserts control flow rates from 0,15 L/min to 233 L/min

Fits inside existing pipework

BT-Maric Insert-type constant flow valves are designed to be installed directly inside existing pipework or press-/slip-fitted into other equipment such as manifolds, water meters, meter tails, and similar components.

They regulate flow rates from 0.15 L/min to 233 L/min, providing accurate and reliable performance regardless of pressure variations.

As the most compact and economical option in the BT-Maric range, inserts are ideal for high-volume OEM applications where space efficiency, cost-effectiveness, and long-term reliability are key requirements.

Plain and Special Inserts

Two types of BT-Maric inserts are available to suit different installation and application needs:

Plain Inserts
Standard inserts are designed for pipe sizes ranging from DN8 to DN40 and are available in brass, stainless steel and PVC. These provide a simple and effective solution for integration into standard fittings and pipework.

Special Inserts
Custom inserts are engineered to meet specific OEM requirements. These versions can be equipped with O-rings for sealing and retention, allowing secure placement within custom housings, manifolds, or other specialised equipment.

Inserts – The Economical Solution for High-Volume Production

Are you facing any of the following challenges?

Do you need a constant flow rate in large-scale production, regardless of pressure variations?
Are you looking for an economical and compact constant flow valve for your upcoming high-volume project?
Do you need to retrofit your system to protect equipment, but have limited space?
Are you aiming to optimize water consumption in your existing installation?
Is water conservation a key priority in your operations?

If any of these challenges sound familiar, BT-Maric constant flow valves may be the ideal solution.

BT-Maric constant flow restrictors – Insert type – help you

with a mechanical, economical, and compact solution for maintaining a constant flow rate in large-scale production – regardless of pressure variations
to integrate effortlessly into existing applications where space is limited
to ensure a reliable, long-lasting (up to 20 years), and maintenance-free operation
to deliver a consistent flow rate across multiple usage points in your system
to provide a tamper-proof solution that prevents unintentional or unauthorized changes to the flow rate
to adapt to future applications – inserts can be customized to meet your specific flow and installation requirements
to protect your equipment by ensuring the correct flow rate at all times
conserve water and promote more sustainable system performance

Specifications for BT-Maric Insert Valve Type

Standard nominal flow rate:

0,15 – 233 L/min depending on valve size.

See all available nominal flow rates

Standard flow rate accuracy:

+/- 10% within the pressure drop range of 1,4 – 10 bar.
Typical performance of BT-Maric constant flow valves >>

Standard operating pressure drop range:

1,4 – 10 bar

Solutions for low and high pressure drop ranges

Standard Operating Temperature:

≤ 60°C

Solutions for high operating temperatures

Operating Temperatures: up to 200°C (depending on the control rubber type and material of the housing).

Size from 1-5:

SIZE 1 = diameter 12,45 mm.
SIZE 2 = diameter 18,40 mm.
SIZE 3 = diameter 26,70 mm.
SIZE 4 = diameter 37,85 mm.
SIZE 5 = diameter 50,40 mm.

Max flow rate per valve body size

Customized solution available depending on quantity.

Standard materials for valve body:

Brass, U-PVC and Stainless Steel.

Other material options

Examples: POM, PVD-F, Titanium, Duplex, PE …

We help you to find the best solution

Our team of experts is ready to help you find the best solution and ensure that you have all the details necessary to make informed decisions. Contact us today!

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Why choose constant flow valves type inserts?

Explore the benefits of constant flow valves
– insert type

Wide Range of Flow Rates
Insert-type constant flow valves support a broad range of flow rates—from as low as 0.15 L/min up to 233 L/min. They offer flexible and economical solutions for high-volume applications and are suitable for various media, particularly water.
Instant Response to Pressure Fluctuations
Engineered for performance stability, these valves respond immediately to changes in system pressure, maintaining a constant flow rate. This ensures reliable operation in systems where consistent flow is essential despite fluctuating conditions.
High Accuracy of Flow Control
Precision-moulded rubber control elements provide flow accuracy within ±10% of the nominal rate, making these valves ideal for applications requiring exact, predictable flow performance.
100% Mechanical Solution
Fully mechanical in operation, these valves require no external power or actuation. Their simplicity and independence from electrical systems enhance both reliability and ease of use.
Simplicity, Reliability and Cost-Effectiveness
With no moving or wearing parts, these valves are exceptionally reliable, easy to install, and offer a highly cost-effective solution for long-term flow regulation.
Ideal for High-Volume and Industrial Applications
Built for OEM integration and industrial use, insert-type valves are well-suited to high-volume environments where space efficiency, durability, and long service life are critical.
Compact Design
Compared to traditional diaphragm valves, BT-Maric inserts feature a compact profile, making them ideal for space-constrained systems and retrofit installations.

Additional features of BT-Maric
– insert type valves

Self-Cleaning and Maintenance-Free
The valve’s internal design promotes self-cleaning, significantly reducing the risk of blockages and minimizing maintenance needs. This ensures continuous, trouble-free operation over extended periods.
Non-Toxic and Odor-Free
Manufactured from safe, non-toxic materials, these valves are well-suited for potable water systems and applications where strict hygienic or sanitary conditions are required.
Long Lifespan
With a service life of up to 20 years, BT-Maric valves offer a long-term solution that reduces the need for replacements and lowers total cost of ownership.
Resistant to Poor Water Quality
The flexible rubber control elements resist scale formation and clogging, making these valves particularly effective in systems exposed to poor or variable water quality.
Tamper-Proof Design
Each valve is factory-calibrated to a specific flow rate. The design prevents unauthorized or accidental adjustments, ensuring constant and secure flow regulation.
Wide Operating Pressure Range
Suitable for systems operating between 0.45 and 20 bar, these valves are versatile and adaptable across a broad range of industrial and commercial applications.
Material Flexibility
Standard valve bodies are available in UPVC, brass, and stainless steel. For more demanding environments, options include POM, PVDF, titanium, duplex, and PE, allowing for chemical compatibility and environmental resilience.
Customizable for Specific Requirements
For unique technical needs or OEM integration, BT-Maric offers fully customizable solutions, ensuring performance and fit are optimized for your application.

How does constant flow valve type Inserts work?

This is how it works

BT-Maric constant flow valves utilize a flexible rubber control O-ring with an orifice diameter that responds instantly to fluctuations in water pressure.

As pressure differential increases, the orifice diameter reduces to maintain the pre-set flow rate.

Likewise, as pressure reduces, the orifice opens up to maintain the pre-set flow rate.

Watch our video:

A mechanical solution to achieve constant flow.

LOW PRESSURE

The ring has a larger opening at low pressure.

HIGH PRESSURE

At high pressure the ring is pressed against the conical body. The ring’s opening reduces and the flow remains constant.

How to specify your constant flow valve type inserts

Determine Your Valve – Step by Step

To help you select the right BT-Maric constant flow valve for your application, follow these key steps:

Define the required flow rate
Select the control rubber type
Choose the valve body material
Specify the valve size
Estimate the required quantity

Learn more about each key step from our specification guide.

Specify Plain Inserts

Choosing the right insert is essential to ensuring optimal system performance and long-term reliability.

To support you in making the correct selection, we have prepared a step-by-step guide to help you specify your plain insert valves with confidence.

Refer to our specification guide for detailed instructions on flow rate selection, material compatibility, dimensions, and installation recommendations.

Specification guide

Specify Special Inserts

Every application is different, and some systems require customized solutions for optimal performance.

BT-Maric offers special insert designs tailored to your specific technical and installation requirements. These can include custom dimensions, materials, O-ring integration for sealing and retention, and unique flow rate configurations.

For detailed specifications, pricing, availability, or technical guidance, please don’t hesitate to contact us. Our team is ready to assist you in developing the ideal solution for your application.