Differential Pressure By-Pass Valves
Emmeti have developed a special range of differential pressure by-pass valves that integrate into 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 pipework. They are designed to either fit before the manifold, or at the end of the manifold. They can be calibrated on site to open at between 0.2 bar, up to 0.5 bar differential between flow and return pressure. We offer solutions primarily for sizes 1” and 1.1/4”, but as a terminal bridging set at the end of the manifold, we do have ½” and ¾” versions, which can be used inside our plastic cabinets.
Please contact the office on 01993 824900 for technical details.
Associated Products for Differential Pressure By-Pass Valves
Heating Manifolds (T2)Heating Manifolds (T3)
What differential pressure range do they operate over?
You can set them to between 0.2 and 0.5 bar.
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.
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
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
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 on either the flow or return pipework?
Fit it to the return pipework. By-pass flow is always from flow to return pipework.
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.