My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know 
where I can get a replacement? It's got FK48T, 5A 250VAC written on it, and 
a symbol that looks like LR written backwards.
Thanks for any help.

Try Radio Spares
http://rswww.com/cgi-bin/bv/rswww/searchAction.do

"johnno" <johnno@nospam.invalid> wrote in message 
news:MSHQe.5257$h4.1235@newsfe4-win.ntli.net...

> My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know
> where I can get a replacement? It's got FK48T, 5A 250VAC written on it, 
> and
> a symbol that looks like LR written backwards.
> Thanks for any help.


One of these? http://www.maplin.co.uk/Module.aspx?ModuleNo=6453&doy=29m8D

In message <MSHQe.5257$h4.1235@newsfe4-win.ntli.net>, johnno 
<johnno@nospam.invalid> writes

>My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know
>where I can get a replacement? It's got FK48T, 5A 250VAC written on it, and
>a symbol that looks like LR written backwards.



Almost anywhere that sells electronic components

The "LR" is a standard, nothing to do with the part number

there are basically two sizes of microswitch, you want the smaller one, 
and without any lever on

-- 
geoff

In message <MSHQe.5257$h4.1235@newsfe4-win.ntli.net>, johnno 
<johnno@nospam.invalid> writes

>My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know
>where I can get a replacement? It's got FK48T, 5A 250VAC written on it, and
>a symbol that looks like LR written backwards.
>Thanks for any help.


Is that a 3 or 4 terminal switch?
I know my 3 port valve (I think an L&S or Wickes version thereof) has a 
strange 4 pin make/break switch which I've not seen anywhere.
The 3 pin type are certainly available from farnell. (Omron SS5 I think)

The "LR" backwards is actually stylised "UR", meaning UL recognised, UL 
being Underwriters Laboratories, the American product safety agency.


-- 
steve

In message , Steven Briggs 
<news@sbriggs.freeserve.unitedkingdom> writes

>In message <MSHQe.5257$h4.1235@newsfe4-win.ntli.net>, johnno 
><johnno@nospam.invalid> writes
>>My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know
>>where I can get a replacement? It's got FK48T, 5A 250VAC written on it, and
>>a symbol that looks like LR written backwards.
>>Thanks for any help.
>
>Is that a 3 or 4 terminal switch?
>I know my 3 port valve (I think an L&S or Wickes version thereof) has a 
>strange 4 pin make/break switch which I've not seen anywhere.


Hmm, I've never seen one of those on an actuator head mechanism


>The 3 pin type are certainly available from farnell. (Omron SS5 I think)
>
>The "LR" backwards is actually stylised "UR", meaning UL recognised, UL 
>being Underwriters Laboratories, the American product safety agency.
>
>


-- 
geoff

On 29 Aug,  
     johnno <johnno@nospam.invalid> wrote:


> My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone know 
> where I can get a replacement? It's got FK48T, 5A 250VAC written on it, and
> a symbol that looks like LR written backwards. Thanks for any help.


I usually get mine from Maplin's. They usually have an arm attached which can
be removed to convert them to the correct type. RS or CPC probably do similar
types.

-- 
  B Thumbs
  Change lycos to yahoo to reply

In article <UR$+IWb151EDFwkK@ntlworld.com>,
   raden  wrote:

> there are basically two sizes of microswitch, you want the smaller one, 
> and without any lever on


Maplin list standard, miniature and sub miniature. The last type used in
many computer mice.

-- 
*Nothing is foolproof to a sufficiently talented fool.

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

On Tue, 30 Aug 2005 09:51:24 +0100, "Dave Plowman (News)"
 wrote:


>In article <UR$+IWb151EDFwkK@ntlworld.com>,
>   raden  wrote:
>> there are basically two sizes of microswitch, you want the smaller one, 
>> and without any lever on
>
>Maplin list standard, miniature and sub miniature. The last type used in
>many computer mice.


Is it one of these ?

http://www.cherrycorp.com/english/switches/submini/index.htm

When I needed to replace one on a zone valve it was a very tiny 1cm
square affair soldered onto a PCB, no lever arm and no way of
accomodating any differences. I ordered a few of RS's smallest and had
to wait for them to get them in. 

When I got it it bore no resemblance at all. *All* dimensions +
mounting centres different   :-(

DG

In article ,
   Derek ^  wrote:

> >Maplin list standard, miniature and sub miniature. The last type used in
> >many computer mice.

> Is it one of these ?

> http://www.cherrycorp.com/english/switches/submini/index.htm


Difficult to tell. The 'sub' has dimensions of 12.8 x 6.5 x 5.8 mm, with
three equally spaced pins at 6.5mm centres.


> When I needed to replace one on a zone valve it was a very tiny 1cm
> square affair soldered onto a PCB, no lever arm and no way of
> accomodating any differences. I ordered a few of RS's smallest and had
> to wait for them to get them in. 

> When I got it it bore no resemblance at all. *All* dimensions +
> mounting centres different   :-(


'Twas ever thus. ;-)

-- 
*I couldn't repair your brakes, so I made your horn louder *

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

Steven Briggs <news@sbriggs.freeserve.unitedkingdom> wrote in
news:gzoE0mFP13EDFwAq@sbriggs.plus.com: 


> In message <MSHQe.5257$h4.1235@newsfe4-win.ntli.net>, johnno 
> <johnno@nospam.invalid> writes
>>My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone
>>know where I can get a replacement? It's got FK48T, 5A 250VAC written
>>on it, and a symbol that looks like LR written backwards.
>>Thanks for any help.
> 
> Is that a 3 or 4 terminal switch?
> I know my 3 port valve (I think an L&S or Wickes version thereof) has
> a strange 4 pin make/break switch which I've not seen anywhere.
> The 3 pin type are certainly available from farnell. (Omron SS5 I
> think) 
> 
> The "LR" backwards is actually stylised "UR", meaning UL recognised,
> UL being Underwriters Laboratories, the American product safety
> agency. 
> 
> 


It's got 4 terminals, only 3 of them connected on the PCB. I think it needs 
to match the same form factor very closely or the cam won't make contact at 
the correct time. It's in inches: 11/16 x 3/16 x 3/8 (L x W x H), with two 
fixing holes 3/8 apart and the plunger in the middle of the top. I couldn't 
see a match at Cherry or Omron or Saia-Burgess.

Thanks for the info about the UR marking, and to everyone else who 
responded. I'm off to find out how helpful Landis & Staefa are...

In message <3O1Re.15782$x4.9477@newsfe3-gui.ntli.net>, johnno 
<johnno@nospam.invalid> writes

>Steven Briggs <news@sbriggs.freeserve.unitedkingdom> wrote in
>news:gzoE0mFP13EDFwAq@sbriggs.plus.com:
>
>> In message <MSHQe.5257$h4.1235@newsfe4-win.ntli.net>, johnno
>> <johnno@nospam.invalid> writes
>>>My Landis & Staefa 3 port valve has a sticky microswitch. Does anyone
>>>know where I can get a replacement? It's got FK48T, 5A 250VAC written
>>>on it, and a symbol that looks like LR written backwards.
>>>Thanks for any help.
>>
>> Is that a 3 or 4 terminal switch?
>> I know my 3 port valve (I think an L&S or Wickes version thereof) has
>> a strange 4 pin make/break switch which I've not seen anywhere.
>> The 3 pin type are certainly available from farnell. (Omron SS5 I
>> think)
>>
>> The "LR" backwards is actually stylised "UR", meaning UL recognised,
>> UL being Underwriters Laboratories, the American product safety
>> agency.
>>
>>
>
>It's got 4 terminals, only 3 of them connected on the PCB. I think it needs
>to match the same form factor very closely or the cam won't make contact at
>the correct time.


Unlikely, it's much easier to profile the cam

I have no idea why a microswitch in an actuator head should require more 
than a N/C - com and N/O - com, especially if only 3 terminals are used

I've never seen such a uswitch used in that application





>It's in inches: 11/16 x 3/16 x 3/8 (L x W x H), with two
>fixing holes 3/8 apart and the plunger in the middle of the top. I couldn't
>see a match at Cherry or Omron or Saia-Burgess.
>
>Thanks for the info about the UR marking, and to everyone else who
>responded. I'm off to find out how helpful Landis & Staefa are...


-- 
geoff