FlexEJ Products People

24hr Shipping
On all stock items ordered.
Mon-Thur by 2pm, 10am Fridays

Design & Manufacturing
Full in-house design & manufacture to EN / ASME / PED.

ISO14001 Accreditation
FlexEJ has an accredited Environmental Management System.

Get A Quote

For a FlexEJ Low Loss Header

Please don’t hesitate to call the team on +44 (0) 1384 881188, or email us sales@flexej.co.uk, or use LIVE CHAT which is available from 8:30AM to 3:30PM weekdays (12:30PM Fridays) to get an immediate response — or use our short get a quote form below. Thanks.

Alternatively, you can also call our expert team directly on +44 (0) 1384 881 188 or use LIVE CHAT from 8:30AM to 3:30PM weekdays (12:30PM Fridays). The team will be only too pleased to talk through your requirements and technical queries over the phone.

Visitors are also welcome Monday to Friday although please get in touch beforehand to let us know you’re coming.

HEADQUARTERS

Factory 2,
Morgan Rushworth Ind Estate,
Bromley Street, Lye,
Stourbridge, DY9 8HY
United Kingdom

Email: sales@flexej.co.uk
Tel: +44 (0) 1384 881 188
Fax: +44 (0) 1384 896 875








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    HEADQUARTERS

    Factory 2,
    Morgan Rushworth Ind Estate,
    Bromley Street, Lye,
    Stourbridge, DY9 8HY
    United Kingdom

    Email: sales@flexej.co.uk
    Tel: +44 (0) 1384 881 188
    Fax: +44 (0) 1384 896 875

    Please also visit our main Low Loss Header product page and for a full technical guide the What Is A Low Loss Header page. Our standard low loss headers are available at factory-direct prices and ship same-day from stock from our Web Shop.

    Can't see what you want? Need help?
    Call us. Or use Live Chat.

    For instant advice. We can custom-design and engineer almost any expansion joint you need for delivery in the UK or worldwide. Call our expert team on +44 (0) 1384 881188 Or email us sales@flexej.co.uk

    Frequently Asked Questions

    A. Yes, to some extent, as the flow velocity in the body is low. We provide a Flamco AAV and DN25 drain valve on all FlexEJ low loss headers. However, separation is not as efficient as using a dedicated air/dirt separator as the main low velocity section in the LLH is bounded by turbulent cross flows.

    A. Opinions vary but ideally all the primary circuit and secondary circuit flow and returns should be brought together in horizontal manifolds before connection to the low loss header.

    A. On a vertical low loss header the returns connect at the bottom and the flows at the top. If the connections are staggered side to side then the lower pair are normally the primary side.

    A. Sizing can be expressed in terms of flow rate or power. In heating systems, the total boiler power in the primary circuit is often taken as the sizing criteria. The power rating is directly proportional to the flow rate and temperature difference as given by m.Cp.Δt – Power (kW) = Mass flow rate (kg/s) * Specific Heat of Water (kJ/kg°K) * Temperature difference (°K). Our product table above shows both nominal flow rate and power ratings.

    A. We have an online low loss header calculator we’ve built to help you – or do  please get in touch with the details of your system and we will be pleased to help.

    A. Based on the flow rate through the low loss header the body is sized to achieve a very low flow velocity – typically less than 0.3m/s. This low velocity ensures a low pressure drop between flow and return.

    A. Yes – strictly speaking hydraulic separation between circuits is achieved using a low loss header.

    A. A low loss header (LLH) provides hydraulic separation between multiple pumped circuits. This allows each circuit to operate independently and to be controlled for optimum efficiency. The header presents very low pressure drop bypass between the flow and return. FlexEJ low loss headers are provided with sensor ports on all four branches so whatever control system is being implemented you will have the port you need.

    A. Our Flange Finder contains details for many common flanges. Typically, to be able to make the identification you need to know the bore size or outside diameter and number of bolts. For technical assistance contact us or use our Live Chat facility.
    Please visit our full FAQ page to see all our frequently asked questions.