FUNCTIONALITY OF BT-MARIC CONSTANT FLOW VALVES

What is a BT-Maric constant flow valve? And what does it do for you?

The BT-Maric flow control valve is designed to deliver a pre-determined constant flow rate of water and similar media regardless of pressure variations within a certain pressure range. The pressure range depends on the type of valve used.

What does a BT-Maric constant flow not do?

The BT-Maric constant flow valve has an effect on the pressure, but is not designed to control the pressure in your system.
The control flow valve has no external actuation and is not adjustable after installation.
BT-Maric constant flow valves do not work with gas or air.

Frequently Asked Question: How do BT-Maric constant flow valves work? When the pressure increases the o-ring is pressed down in the conical seat and the orifice of the o-ring decreases in size in such a way that the flow remains constant at the pre-set nominal rate, and vice versa. In this way, the pre-set nominal flow rate is always kept constant regardless of the pressure variations.
How do BT-Maric constant Flow Valves work?

BT-Maric constant flow valves utilize a flexible rubber control O-ring with an orifice diameter that responds instantly to fluctuations of the pressure exerted. When the pressure increases the o-ring is pressed down in the conical seat and the orifice of the o-ring decreases in size in such a way that the flow remains constant at the pre-set nominal rate, and vice versa. In this way, the pre-set nominal flow rate is always kept constant regardless of the pressure variations.

Why should I use a BT-Maric constant flow valve?

BT-Maric constant flow valves will help you:

  1. to reduce investment and operating flow-related costs by always providing the chosen specified flow rate regardless of the pressure variations. Pressure variations often occur in systems with many points of consumption.
  2. to improve the water flow or similar media in your process or product by always providing the chosen specified flow rate regardless of the pressure variations. Your system will thus have a stable, constant flow rate if the pressure drop is within specified limits. It will prevent the break down or damage of equipment. It will extend life span of your equipment. It will provide valuable protection for flow rate sensitive pumps, filters, pump glands, and water distribution systems.
  3. to save water by limiting the flow rate at usage points. Water is a vital natural resource and needs to be saved at all times.
Can we use BT-Maric constant flow valves for air or gas?

No, only for water and similar liquids.

When can I use an insert?

An insert is the most cost-efficient solution to incorporate the constant flow function in your process or equipment for flow rates up to 233 l/min. The insert is fitted in a suitable place in your existing pipe.

Can BT-Maric constant flow valves be exposed to food?

It depends where the valves are located. If our constant flow valves are placed in the secondary system, it can be used in food application as category 4 (when not in direct or insignificant contact with food). Please check EC regulation 1935/2004.

Can I change the flow rate after I have purchased a BT-Maric valve?

The flow rate must be decided before ordering. Of course, you could always change an existing constant flow valve with one equipped with another flow rate.

What is pressure drop? Is it important?

Pressure Drop “or headloss”, across the valve, is simply the difference between inlet and outlet pressure, and is determined by your installation.
Yes, it is important because the constant flow function is only ensured when the pressure drop is within the specified limits. Please consult the section “about headloss” of our catalogue p.8. You can order our constant flow valve catalogue here.

Can you calculate the headloss/pressure differential for me?

We do not advise what the pressure differential will be. But it should be possible for you to calculate it if you have relevant installation data available. You will then be able to select a valve with the appropriate pressure differential range for your application. The pressure drop across the valve will in fact be determined by the parameters of each installation as it has its own individual specifications. If you are unsure if a BT-Maric valve will be suitable for your application, it will be necessary to predict what the pressure differential will be across the valve by calculating as described in page 9 of our catalogue. You can order our constant flow valve catalogue here.

How can I calculate the pressure differential?

The differential across the constant flow valve, will be the difference in pressure between the inlet and outlet. You can check our catalogue “calculating pressure drop”. You may order our constant flow valve catalogue here.

What is the life span of BT-Maric constant flow valves?

up to 20 years.

Where can I find the dimensions and weights of BT-Maric constant flow valves?

You can find the dimensions and weights of our constant flow valves in our catalogue. Order our constant flow valve catalogue here.

PURCHASE OF BT-MARIC CONSTANT FLOW VALVES

Where can I purchase the BT-Maric constant flow valves?

Send an enquiry to one of the following addresses:

Our sales team will be more than happy to assist you.

How about prices?

You should send your price enquiry to one of the following addresses:

Our sales team will be more than happy to assist you.

Can I buy only 1 BT-Maric constant flow valve?

Yes. You can.

Can I buy BT-Maric constant flow valves even though I am a private person?

No, as we are only dealing with B2B buyers.

How can I check the availability?

You should send your enquiry to one of the following addresses:

How long does delivery take?

It varies depending on the type of constant flow valve that you need. If we have the needed item in stock, we ship within one or two days. If we are out of stock, delivery might take 2-4 weeks. When ordering, please let us know immediately just how urgent your delivery is. We will do our best to shorten delivery time.

What about guarantees?

Our constant flow valves have a guarantee of 1 year, as already mentioned life expectancy is up to 20 years.

Can you manufacture customized constant flow valves?

Yes. Just get in touch with us and we shall discuss details. You will find our contact info here.

INSTALLATION OF BT-MARIC CONSTANT FLOW VALVES

How do you install inserts?

Insert must be installed the right way around or immediate failure may result. The visible part of the control rubber should meet the flow. The insert should be placed in the existing pipe works of your equipment.

How do you install threaded valves?

Valves must be installed the right way around or immediate valve failure may result. The flow direction is indicated by an arrow stamped on the body valve.

Frequently Asked Questions: How do you install BT-Maric constant flow valves?

It is recommended to orientate the valves stamped data toward the top or in such a position to facilitate identification. Bends or elbows immediately in front of valve will not affect the valves performance, however due to the velocity of the water jets exiting the valves, it is recommended that a straight pipe, the length of approximately the nominal diameter of the fitting, be fitted on valves outlet.

How can I get a tighter seal with PVC screwed valves?

You can get a tighter seal by using thread tape. The maximum recommended tightness is hand tight plus a quarter turn. DO NOT TIGHTEN IT more than a quarter turn otherwise you will damage the valve. Care needs to be exercised in handling tighter seal in connection with PVC valves.

How do you mount wafers?

Wafer type valves are designed for mounting between smooth flat faced pipe flanges.
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MAINTENANCE OF BT-MARIC CONSTANT FLOW VALVES

Do BT-Maric constant flow valves need some special maintenance?

No specific requirements are necessary. The BT-Maric constant flow valves are self-cleaning.

Do I need to change my constant flow valve every 3-5 years?

Not necessarily. Much depends on your application. Our constant flow valves have a life expectancy of up to 20 years. High media temperature, abraising particles and lime may affect accuracy over time. Also, in general it can be said that over time the control rubber O-ring gets harder, over a time period of 10 years flow accuracy may drop by 5%.

Where can I buy spare parts?

Due to the valves unique design and the lack of wearing components spare parts are not available.

CERTIFICATIONS OF BT-MARIC CONSTANT FLOW VALVES

Are BT-Marics flow valves potable water certified?

Yes. We have potable water certificates: from Australia and France.

What is the difference between a constant flow valve and flow limiter?

There is no difference. These are just different designations. They are called flow limiter, flow controllers, throttle valves, fluid control valve or mass fluid control valve.

What does a flow controller/limiter mean?

It means that the flow of a liquid/media will be always the same inside the pipeline system regardless of changes in pressure variations within a specified pressure range.

What are the main advantages to install a BT-Maric, flow control valve?
  • Control the flow rate of a water and similar media regardless of the pressure variations
  • Designed for flow rates starting as low as 0.15 l/min going up to over 13 500 l/min.
  • Flow rates available in incremental small steps
  • 100% mechanical, fully automatic and does not require additional energy
  • Uniquely precise: Our standard solution Precision has an accuracy of nominal flow rate +/- 10%, for the whole pressure drop range starting as low as 1,4 Bar up to 10 Bar.
  • Simple, compact, reliable and characterized by a long operating life (up to 20 years)
  • Wide range of connection types and materials are available
  • High Pressure solutions managing pressure differentials up to 20 Bar
  • Low Pressure solutions managing pressure differentials from 0,4 Bar
  • Maintenance free: no need for spare parts
  • Pre-set to avoid adjustment errors or unwanted system changes => the flow rate must be specified when ordering
  • Significantly reduce investment and operating costs
  • Prevent equipment break-down and extend life span of your equipment/product
  • Self-regulating and self-cleaning: do not clog
  • The constant flow valves are mainly for water applications and these valves are particularly suitable for use on poor water quality, because the flow controlling element is a rubber material, and flexes under normal operation. This minimizes the risk of blockage and eliminates the build-up of scale.
  • Save water or other media. Reduce waste.

HAVE YOU GOT ONE OF THE FOLLOWING CHALLENGES?

  • Do you need to limit the water flow precisely in your system?
  • Have you got filters that need a pre-set constant water flow?
  • Do you need to optimize your equipment for a specific flow rate?
  • Do you need to mix fluids in specific proportions? At high pressure?
  • Do you need to swiftly adjust flow rates at high flow rates at changing pressures?
  • Do you need to protect your (centrifugal) pumps?
  • Do you need to control and minimize gland flushing water flow rate?
  • Do you need to limit the water taking near the source within your irrigating system?
  • Do you want to save water in hotels, restaurants, waterpark, condominium, campings by limiting flow rate at usage points? Is saving water a priority to you?
  • Do you need to ensure an adequate flow to emergency shower stations?
  • Do you need to suppress dust from spray nozzles?
  • Do you need to control the maximum flow from each nozzle in a firefighting equipment?
  • Do you need to control water flow in a cooling equipment and/or distillery?
  • Do you need to limit the peak flow rate through ultraviolet sterilizers to ensure 100% bacteria kill?
  • How can I control my water flow rate in my humidifier equipment?
The solutions

The answer to all these questions is: install a BT-Maric constant flow valve.