Regarding the Tacosetter, I understand this is a fixed valve that sets the flow rate in the bypass, but with a visual display of the flow rate value. In effect I do have the same arrangement today with a fixed valve (but with no display) + ABV in series; so currently I am setting the fixed rate 'blind'.
Also, from what I understand, the problem of my permanently open ABV (no matter what its setting), is that there is too much pressure all the time, and this is forcing the ABV open.
Are you suggesting that:
- an almost closed fixed valve will reduce the pressure on the ABV, allowing the ABV to be set within its normal range?
- using CP1 will also reduce the pressure on the ABV?
Is this pressure made worse by the bypass pipework which Tee's off from the Flow after the motorised valves (see picture), and in such a way that it presents the lowest resistance of all the 4 paths (3 MVs & 1 bypass)?
Also, from what I understand, the problem of my permanently open ABV (no matter what its setting), is that there is too much pressure all the time, and this is forcing the ABV open.
Are you suggesting that:
- an almost closed fixed valve will reduce the pressure on the ABV, allowing the ABV to be set within its normal range?
- using CP1 will also reduce the pressure on the ABV?
Is this pressure made worse by the bypass pipework which Tee's off from the Flow after the motorised valves (see picture), and in such a way that it presents the lowest resistance of all the 4 paths (3 MVs & 1 bypass)?