Machinegun_AK Senior Member Joined: 28 Jun 2011 Posts: 1 Location: Vancouver Expertise: I live coffee
Posted Sun Jul 15, 2012, 12:09am Subject: Dezcal discolors brass?
I am restoring a mistreated Bezzera BZ02. It's mostly cosmetic on the outside but the inside I notice there is some scale build up on various things. One thing that seems to be having trouble is steam pressure release valve. It's the valve that is open until the boiler starts to get to temp and then is suppose to pop up and seal. I believe this valves allows the machine to warm up without having to bleed the steam wand like in the Oscar. Other have written that scale can cause this valve to stick and not seal and consequently generate a hissing sound. What I noticed was that it was sputtering water inside the casing. I took it apart and dunked it in a packet of Dezcal mixed to 1L of what as instructed on the packet. While it did clear out all the scale build up, I noticed where the scale was replaced with some discolor brass. I'm guess it was brass to begin with. The color is now pinky, almost copper like. Is this normal? Or perhaps was it always copper but with some sort of brassy coating that got corroded by the limescale?
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.