Hello Wide Eyed And Legless. I have no idea what you are talking about. We have not got any reports on the
blowtie not working? It has become the our assumption that you have association with another competitor which is probably the source of these so called reviews.
The poppet and spring simply have mechanical engineering constraints that will always prevent this design from working well. This was done in this video here:
Can we propose that you come in and we do a video together and we will do a direct comparison between the opening and closing pressures from 0-15psi and using some digital pressure logging transducers we can actually demonstrate how well each one works. Whatever the results are we will publish them on the forum. We will use a blowtie unit and you can bring as many different poppet and spring spunding valves you like.
A diaphragm will amplify the forces to activate the valve therefore giving higher resolution of control. Especially with small forces (ie. low pressures below 15psi). Diaphragms are used so widely throughout so many different industries where accurate pressure control is required.
We did design a much more accurate stainless poppet and spring spunding valve than many others on the market but the reality is it works nowhere near as well as the
blowtie which is far more accurate than any of these poppet style spunding valves. Despite a significant amount of engineering, design and testing work we have come full circle and come back to the conclusion that a diaphragm is simply a better way to control pressure.