BT-Maric Threaded Constant flow valves

BT-Maric threaded constant flow valves are designed to deliver a constant, pre-set nominal flow rate for water and similar media—regardless of pressure fluctuations. Threaded valve bodies offer easy installation and are ideal for space-constrained applications, as their external diameter is only slightly larger than the connected pipe. Their mechanical design ensures reliable and accurate flow control without the need for external power or regulation systems.

Threaded valves control flow rates from 0,15 l/min to 342 l/min

For a Wide Range of Flow Rates

BT-Maric constant flow valves are available for pipe sizes ranging from 1/8″ to 2″ and can regulate flow rates from as low as 0.15 L/min up to 342 L/min. They are suitable for water and similar media, and ensure consistent performance regardless of pressure variations.

BT-Maric threaded valves offer a simple, compact and highly reliable solution. With no moving parts and a maintenance-free design, they are built to last—providing up to 20 years of service life.

BT-Maric threaded valves are available in BSP or NPT. BSP threads are available in many sizes, in M&F, F&F, and F&M. NPT threads are available in F&F only.

High Accuracy of Flow Control

Our standard control rubber type, PRECISION, ensures a high level of accuracy—maintaining flow within ±10% of the nominal rate.

BT-Maric threaded valve with PRECISION control rubber joint is designed to operate within a pressure drop range of 1.4 to 10 bar.
Other control rubber types are available for alternative pressure ranges, depending on your application needs.

 

Threaded valves – offers the best flow rate accuracy

Are you facing any of the following challenges?

  • Do you need a constant flow rate regardless of pressure variations?
  • Are you looking for an economical and easy-to-install flow valve for your product or system?
  • Do you need a simple retrofit solution for your existing application?
  • Are you aiming to optimize water consumption in your current system?
  • Is saving water a priority for your operation?

BT-Maric Threaded valves help you:

  • to achieve a mechanical, cost-effective, and compact solution to control and maintain a constant flow rate in large-scale production – regardless of pressure variations
  • to integrate seamlessly into existing systems where space is limited
  • to ensure a reliable, long-lasting (up to 20 years), and maintenance-free solution
  • to deliver a consistent flow rate across multiple points of use within your system
  • to prevent tampering or accidental adjustments to the flow rate – ensuring stable and secure operation
  • to adapt to future needs – custom inserts are available to match your specific requirements
  • to protect your equipment by maintaining the specified flow rate at all times
  • to reduce water consumption and support sustainable resource use.

Specifications for BT-Maric standard threaded constant flow valves:

Standard nominal flow rate:

0,15 – 342 L/min depending on valve size.

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

Standard Operating Temperature:

≤ 60°C

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

Connection size:

Connection size from 1/8″ up to 2″: 1/8″, ¼″, 3/8″, ½″, ¾″, 1″, 1¼″, 1½″, 2″ (Standard ISO 228/1 BSP).

NPT threads are available in F/F 1/8″, ¼″, 3/8″, ½″, ¾″, 1″, 1¼″, 1½″, 2″ in Stainless Steel only.

Standard configuration:

Feamale/Feamale.

Male/Female, Female/Male, Male/Male are also available depending on the size of the valve and material of valve body.

Standard materials for valve body:

Brass, U-PVC and Stainless Steel.

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

Brass

U-PVC

Stainless Steel

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!

Why choose threaded constant flow valves

Explore the benefits of Threaded constant flow valves

  • Wide Range of Flow Rates

    Threaded constant flow valves support flow rates from as low as 0.15 L/min up to 342 L/min, offering a flexible and economical solution for water and similar media across a wide variety of applications.

  • Wide Range of Sizes and threaded connections

    From 1/4″ BSP to 2″ BSP and threaded connections (FF, FM, MF, MM). NPT threads available in FF design only.

  • Instant Response to Pressure Fluctuations

    Engineered for stability, these valves respond immediately to pressure changes, maintaining a consistent flow rate. This makes them ideal for systems where steady flow is critical, even under variable operating conditions.

  • High Accuracy of Flow Control

    Equipped with precision-moulded rubber control elements, the valves deliver flow accuracy within ±10% of the nominal rate. This makes them well-suited for applications requiring reliable and exact flow performance.

  • 100% Mechanical Operation

    These valves operate entirely without external power or actuation. Their mechanical design ensures simplicity, reliability, and independence from electrical systems.

  • Simplicity, Reliability and Cost-Effectiveness

    With no moving or wearing parts, threaded valves offer high reliability, straightforward installation, and long-term cost savings through maintenance-free operation.

  • Designed for Industrial Use

    Constructed with durability in mind, they perform reliably in demanding industrial environments, where robustness and long service life are essential.

  • Compact Design for Easy Integration

    Thanks to their compact form, threaded valves are particularly suitable for retrofitting into existing systems where space is limited. Compared to traditional diaphragm valves, they offer a streamlined solution without compromising performance.

Additional features and advantages

  • Self-Cleaning and Maintenance-Free

    The valve’s design minimizes the risk of clogging and eliminates the need for routine maintenance, ensuring continuous, hassle-free operation over extended periods.

  • Non-Toxic and Odor-Free

    Made from safe, non-toxic materials, these valves are ideal for use in potable water systems and environments with strict sanitary requirements.

  • Long Service Life

    Designed for durability, the valves offer a lifespan of up to 20 years, significantly reducing the need for replacements and lowering long-term operating costs.

  • Resistant to Poor Water Quality

    The use of flexible rubber control elements helps prevent blockages and scale formation, making these valves especially effective in systems with poor or variable water quality.

  • Tamper-Proof Configuration

    The flow rate is pre-set and cannot be altered, intentionally or accidentally—ensuring secure, consistent operation throughout the valve’s lifespan.

  • Wide Operating Pressure Range

    Suitable for systems operating between 0.45 and 20 bar, these valves provide flexibility across a broad range of applications and system requirements.

  • Broad Range of Material Options

    Available in standard materials such as UPVC, brass, and stainless steel, with optional alternatives including POM, PVDF, titanium, duplex, and PE, allowing compatibility with various fluids and environmental conditions.

  • Customizable for Specialized Needs

    For unique applications or project-specific demands, custom-built valves and inserts can be provided to meet exact technical requirements.

This is how our threaded constant flow valves 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

Determine the Right Threaded Valve for Your Application

Follow these steps to specify the valve that best suits your system:

  1. Define the required flow rate
  2. Select the control rubber type
  3. Choose the valve body material.
  4. Specify the valve size and configuration type ( from ⅛″ up to 2″)

Learn more about each key step from our specification guide.

specify your threaded valve

We understand that selecting the right valve can be crucial to your project’s success.
Please consult our guide for help to specify your standard connections step by step

Specification guide

Specify non standard valves

Since each application is unique, we’re here to provide personalized assistance and detailed information tailored to your needs.
For specifications, pricing, availability, or any other questions, please don’t hesitate to reach out.

Contact us

Download

Installation instructions

Valves must be installed the right way around. A dir­ection of flow arrow is stamped on the valve body.

Instructions

Learn more