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BDB BES900 3-way solenoid valve repair
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witoldb
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Joined: 15 Aug 2013
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Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
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Posted Thu Feb 27, 2014, 4:49pm
Subject: BDB BES900 3-way solenoid valve repair
 

Solenoid valve in my BDB (OLAB make) started to make occasionally buzzing noise during brewing.
It was starting to buzz after preinfusion. Sometimes the noise stopped after a while and valve did open fully and pressure reached 9 bar.
Or it was buzzing continuously and pressure was reaching only 6 bar.
Cleaning did help to some extend but it was still happening although less frequently.
First I sought that 240V coil (my machine came from Australia) is too weak for our local 230V when it fluctuates within 10% spec.
Replacing it with 220V coil did not help.
After careful examination of the seats, I saw some deformation/wear on the front ruby seal.
Probably the spool was seating too low and coil was not able to pull it in.
I've replaced the seal with gaskets cut from elastomer sheets with 6mm hollow punch.
First one (on internal spring side) is 2.5mm thick EPDM and 2nd is from 1.2mm silicone.
Machine works now without any problem for last 4 weeks with either 240V or 220V coils.

Damaged and new seals

witoldb: gaskets.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:49pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

Ready for assembly

witoldb: components.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:51pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

First seal installed.
I had to use 2 seals as ID of the hole at the edge is smaller (5.3mm) and it was difficult to push a seal made from one piece.
ID of the hole after the edge is 6mm and its depth approximately 3.5mm  
Use 111/food grade lubricant to ease installation.

witoldb: 1st gasket installed.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:52pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

2nd seal installed

witoldb: 2nd gasket installed.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:53pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

Back seal on drain connection side (original ruby material)

witoldb: back seal.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:54pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

Details of original coil

witoldb: orig 240V coil.JPG
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witoldb
Senior Member


Joined: 15 Aug 2013
Posts: 106
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Feb 27, 2014, 4:55pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

Generic make coil which also works

witoldb: generic 220V coil.JPG
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oofnik
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Joined: 29 Mar 2006
Posts: 115
Location: Israel
Expertise: I love coffee

Espresso: NS Oscar, Gaggia Factory
Posted Tue Mar 11, 2014, 12:40pm
Subject: Re: BDB BES900 3-way solenoid valve repair
 

Nice work! Looks interchangeable with the CEME one I rebuilt not long ago.
Good resource for those of us who live in places where repair parts are prohibitively expensive or unavailable.
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