Codababa Do these parts look correct to build up the new safety valve assembly?
B.2.029 - LA Marzocco vacuum breaker
T - Valve - https://coffeeaddicts.us/products/1-4-m-x-1-4-f-x-1-4-m-bsp-t-fitting?pos=3&sid=f1ccf5aa8&ss=r
Safety Valve - Does this look to be the right one? https://espressocare.com/products/safety-valve-1-4-bsp?pos=7&sid=9cff08ab2&ss=r
Look to be fine, for the safety valve, it’s the rating that’s important, I recommend a valve with a rating anything from 1.8 to 2.4 bar, any less and at 130C you are on the limit of it opening!
The LM vacuum breaker if it’s LM branded is ridiculously expensive, the same one is available without LM printed on it, see if you can find it. Also get a quite for parts from ACS in a single delivery, you may find it’s cheaper overall to get all your parts from them, especially if you want to get any maintenance spares.
In the photo below it looks like you have a leak on the steam (?) tap, unless you fixed it and didn’t clean up the steel ledge blow. Search the forum you will find posts with fix advice for that (with photos). This could be the source of the hissing, if it only does it with the steam boiler on, and not the pipes to the group. Does it hiss with the steam boiler cold and off? If you need to tighten the group pipes they are a conical compression fitting, rarely if ever leak and shouldn’t be over-tightened.
In the next image, the red numberf pipes perform the function
- Pipe returning steam to the water tank if safety valve goes off
- Pipe taking fresh water to tank if mains plumbed attaches to inlet solenoid
- Pipe pumping high pressure water from gear pump to machine
- Pipe taking any expansion valve steam and droplets to drip tray
So you will have to do some things, like loosing the Y piece and as the pipe won’t fit replacing the pipe from solenoid to water tank. The replacement safety valve will be very tricky to add a pipe to, because the top is wider…you may be able to find a silicone one to get over it and if so, route that separately to the water tank (you need to figure out how to do that), or simply don’t have a pipe.
The pipe from the vacuum breaker to the drip tray should fit..if not you need a new one. Please note all these silicone pipes can be sourced from ebay for a few bucks..
lastly don’t forget replacing the temperature sensor (they are a pretty standard part), they should have a pull apart connector part way down the length and the new one should have a similar connector on it.
