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ARRAREX  VAM/CARAVEL

piston seals replacement

 

The VAM and Caravel are machines with a low maintenance, limited to replacement of the seals of the piston.

 

The piston is composed of three parts:

   
 

- the head for attaching the piston to the boiler

the head is fixed on the boiler on early models with a ring and a mechanism that rotates and blocks the head on the boiler. The ring disappears in later models that use a removable pin.
 

- the hub

the hub on the first model is spherical, then flat and finally protected by a sleeve
 

- the body with seals

the piston body in the first model uses two identical sealing lip, in the second model the top seal is replaced with an o-ring. in the last model the seals are replaced with the adoption of two internal o-ring. On all models (except VAM 1.0) there is a small o-ring inside.

 

Types of piston

type 1a type 1b
 model with hub spherical, piston not removeable and no hole on the bottom  (VAM)

 

type 1c

model with hub spherical, piston removeable with hole on the bottom  (VAM)

type 1c

model with hub flat

 

model with hub flat and sleeve

 

type 2 type 3
model with hub flat, sleeve and o-ring

model without seals  (inside piston housing)

 

 

The seals

The original seals, of course, are no longer available so the only solution is to find seals compatible or to make custom replica.

 I experimented both the solutions:

- NBR commercial u-cup gaskets (different size but suitable)

- silicone custom u-cup gaskets (replica of original ones)

 

Seals replacement

To proceed with the replacement of the 3 seals, must dismount the body of the piston, removing the ring that secures it to articulated shaft

Then remove the small o-ring seal on the bottom of the piston with tweezers

remove the other two seals and clean the piston from the residues of fat or limestone

insert the new gasket and refit the shaft

before reinserting the piston into the boiler lubricate the seals with silicone-based grease for food contact.

 

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