Very clear explanation. I think I got all of it inside my brain. One thing is missing though: WHY should I release the so-called false pressure? What BAD does it do to the process of pulling a shot if I do not release it? Oh, and one more thing. I have pulled approximately 750 shots from my LaPavoni over the year, and I have NEVER experienced the sudden drop of pressure that is clearly visible on YOUR gauge when opening the steam valve. Do you have an explanation for that? Thx again sir!
To answer your observation and question. So-called “False Pressure” only occurs if you have overfilled your boiler to the point where the expansion of the water and air causes cut off boiler pressure to be reached before the water has reached its ambient, free atmospheric pressure, boiling temperature. In that circumstance when you open the steam valve the whole of the boiler pressure is released in a short burst as demonstrated in the video. Then to regain boiler pressure the water has to be further raised in temperature to reach its designed boiler pressure boiling point/temperature. If you try to pull a shot when so-called “false pressure” is present then there is insufficient continuous boiler pressure to force enough water into the group head. If you do not overfilled your boiler then at boiler pressure cut of point the water temperature is above its abient, free atmospheric pressure boiling point. In that circumstance there is no so-called “false pressure” so when you open the steam valve the water immediately boils, and continues to boil, and thereby maintains a boiler pressure sufficient to maintain a continuous flow of steam and sufficient to force water into the group head when you raise the La Pavoni lever. You say that you “have NEVER experienced the sudden drop in pressure”. The reason for that is you have NEVER had so-called “false pressure” and therefore no need to release the so-called “false pressure”. I’m sorry that my reply is a little wordy. I hope it is clear enough.
Thank you very much Glenn for this awesome explanation of the so-called false pressure phenomenon. I took a lot of advanced pneumatic and hydraulic courses in my career and therefore couldn't get my head around how pressure could even be called false pressure. Whoever came up with this term should have called it trapped air in the first place.
Thank you for your comment. The flat-out ignorance of many who ought to know better never ceases to amaze me. Civilisation itself is presently hostage to such people.
Thank you. Your clear and concise information is helpful for me to understand about "false pressure".
You explain very well! Thank you for the info👍
Thank you
Great information. Thank you!
Very clear explanation. I think I got all of it inside my brain. One thing is missing though: WHY should I release the so-called false pressure? What BAD does it do to the process of pulling a shot if I do not release it? Oh, and one more thing. I have pulled approximately 750 shots from my LaPavoni over the year, and I have NEVER experienced the sudden drop of pressure that is clearly visible on YOUR gauge when opening the steam valve. Do you have an explanation for that? Thx again sir!
To answer your observation and question.
So-called “False Pressure” only occurs if you have overfilled your boiler to the point where the expansion of the water and air causes cut off boiler pressure to be reached before the water has reached its ambient, free atmospheric pressure, boiling temperature. In that circumstance when you open the steam valve the whole of the boiler pressure is released in a short burst as demonstrated in the video. Then to regain boiler pressure the water has to be further raised in temperature to reach its designed boiler pressure boiling point/temperature.
If you try to pull a shot when so-called “false pressure” is present then there is insufficient continuous boiler pressure to force enough water into the group head.
If you do not overfilled your boiler then at boiler pressure cut of point the water temperature is above its abient, free atmospheric pressure boiling point. In that circumstance there is no so-called “false pressure” so when you open the steam valve the water immediately boils, and continues to boil, and thereby maintains a boiler pressure sufficient to maintain a continuous flow of steam and sufficient to force water into the group head when you raise the La Pavoni lever.
You say that you “have NEVER experienced the sudden drop in pressure”. The reason for that is you have NEVER had so-called “false pressure” and therefore no need to release the so-called “false pressure”.
I’m sorry that my reply is a little wordy. I hope it is clear enough.
Thank you very much Glenn for this awesome explanation of the so-called false pressure phenomenon.
I took a lot of advanced pneumatic and hydraulic courses in my career and therefore couldn't get my head around how pressure could even be called false pressure.
Whoever came up with this term should have called it trapped air in the first place.
Thank you for your comment. The flat-out ignorance of many who ought to know better never ceases to amaze me. Civilisation itself is presently hostage to such people.
You audio level is super quiet.
Your naked body reflected in La Pavoni is slightly disturbing.
Let's call it the Easter egg of this video 😂
Come on, we are all humans