Differential Pressure By-Pass Valves

Emmeti have developed a range of differential pressure by-pass valves to suit our manifold range. These simple kits can include a pair of ball valves, with red and blue handles for flow and return, the by-pass valve itself, and a chrome plated rigid by-pass pipe.

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Technical Data

CMYK base

Differential pressure by-pass kit with straight Progress ball valves

Differential pressure by-pass valve from 0.2 to 0.5 bar.

Complies with building regulation Part L requirements. For connection to the left side of a manifold, connecting to flow and return rails. By-passed flow direction is from flow (red handle) to return (blue handle).

CMYK base

Differential pressure by-pass kit with right angle Progress ball valves

Differential pressure by-pass valve from 0.2 to 0.5 bar.

Complies with building regulation Part L requirements. For connection to the left side of a manifold, connecting to flow and return rails. By-passed flow direction is from flow (red handle) to return (blue handle).

CMYK base

Differential pressure by-pass kit

For Topway pre-assembled manifolds.

Differential pressure by-pass valve from 0.2 to 0.5 bar.

Downloads

Information

Emmeti Underfloor Heating Manifolds Sales Brochure

Product and system guide with range information, product features and examples for Under Floor Heating applications

Emmeti Wall Hung Radiator Manifolds Sales Brochure

Product and system guide with selector tables, range information and examples for wall hung radiator manifold applications

Technical


Technical product guide differential by pass valve dimensions October 2013

Technical drawing of a Manifold Differential Pressure By Pass Kit

FAQS

Do flow meters affect their function?
If all your flow meters are set very low, then it will be opening more frequently. You may consider whether you have the correct rated pump for your low flow system.

Can I fit on either the flow or return pipework?
Fit it to the return pipework. By-pass flow is always from flow to return pipework.

Can I fit one of these with a Topway T2 manifold?
Yes, it works with either the flow meter or lockshield versions. You can use either 01306160 1” or 01306162 1.1/4” which include the ball valves and rigid by-pass pipe.  Or 01306174, 76 with no ball valves.

Can I fit one of these to a Floor Mixing Unit?
Yes,  it works with either the flow meter or lockshield versions. You can use either 01306160 1” or 01306162 1.1/4” which include the ball valves and rigid by-pass pipe.  Or 01306174, 76 with no ball valves

Do you have an option of just the differential by –pass valve?
Yes, although not published here, please ask for code 01406060 22mm copper compression version

How do I set them?
They are provided with detailed instructions. Best practice is to calibrate them using the pump manufacturers flow curves, taking account of what the boiler needs as a minimum return flow.

How do I clean and flush out an underfloor heating system?
Both new and replacement systems (a system where a new boiler is fitted is classed as a replacement system) are required by the Building Regulations1 to be thoroughly cleaned and flushed and a water treatment inhibitor added to protect the system from further corrosion. This is also particularly important where an underfloor heating (UFH) system is added to an existing heating system, to prevent the new UFH system becoming contaminated by water in the older system which may be contaminated with corrosion sediment. For further details of how to do this consult the following guides and code of practice:  
  1. Domestic Building Services Compliance Guide
  2. BS 7593 – Code of practice for treatment of water in domestic hot water central heating systems
  3. BSRIA Guide BG29/2012 - Pre-Commission Cleaning of Pipework Systems
  4. BSRIA Guide BG 4/2011 – Underfloor Heating and Cooling


Can you connect a copper pipe to any of Emmeti Manifolds?
Yes but we only cater for 10mm and 15mm pipe