Main features - ATEX - RO-BO Mechanical Workshop

MAIN  FEATURES  OF  VALVES  CERTIFIED ATEX  II 1/2 GD c T135 °C

Rotary valves made by RO-BO has been designed for bulk materials handling and dosing both for powders and grains. Thanks to the over 50-years experience, often anticipating and adapting new technologies to industry, we are proud to present this line of Atex valves that combine the traditional skills of manufacturing precision and reliable longevity, with this safety attestation .

SECURITY
These rotary valves are intended for use in  ATEX  0 /20 inside and 1/21 outside.

MIE
minimum ignition energy :   ≥  3 mJ

RELIABILITY
The proverbial reliability of our products was further increased in this series of valves, in order to ensure years of safe working and without MAINTENANCE
The rotors are HARDENED AND BALANCED before assembly , in order to obtain a smooth and quiet rotation that does not generate undesirable increases in temperature and early wear.
The stators are inspected on a random time to ensure uniformity in the standard of quality required by the project .
Bearings and Seals are chosen from the catalog of the best European producers.
After assembly , each valve is tested and sealed before shipping.
The valves are sealed so as not to compromise the calibration of the internal registers, so it is forbidden tampering with them, otherwise you lose the warranty.
As it is forbidden to even loosen one bolt, it would be good to predict the presence of the gearbox, ordering it already installed or ask the manufacturer.
According to regulation, it is mandatory to fix the time within which bearings and seals must be replaced. But as the valve can not be touched by unauthorized persons, on the rating plate is an indication, in working hours, within which to carry out the review, also established based on the product worked .
In this regard, a reference table is available on the user's manual.

MAINTENANCE
NONE ,  LUBRICATION INCLUDED.

NB   :   ATEX  VALVES  WILL  BE  PROVIDED  WITH  OR  WITHOUT  ATEX  GEARBOX  INSTALLED .

CONSTRUCTION
And now let’s move to some observations about the components of a rotary valve and the materials used :
Rotary valves are assemblies made by different components :

STATOR  (BODY OF THE VALVE): it is made by cast-iron, with the add of  NICHEL  to have features of constant homogeneity and to increase significantly mechanical properties, such as: hardness, toughness, WEAR RESISTANCE.
SIDES: they are made from the same production cycle of the stator.
ROTOR: it is generally made by two parts: the internal core and the laminaes that make the "star" of sectors.    Laminaes are welded to the core part.

CONSTRUCTION FEATURES

Valves can be made of different materials depending on usage. Here are some examples:

FOR NON_CONTAMINATING MATERIALS  ( FOOD INDUSTRY )

OPTION  A
STATOR: Cast-iron EN GJS 400/15 totally coated with NITEK (internal - external)
SIDES:    Cast-iron EN GJS 400/15 totally coated with NITEK (internal - external)
ROTOR : Carbon steel with laminaes welded   totally coated with NITEK

OPTION B
STATOR : Steel casting in 1.4301  or  1.4401
SIDE :     Steel casting in 1.4301  or  1.4401
ROTOR :   Steel 1.4301  or  1.4401

OPTION C
STATOR : Steel casting in 1.4301  or  1.4401 totally coated with Nitek
SIDES :    Steel casting in 1.4301  or  1.4401 totally coated with Nitek
ROTOR :    Steel casting in 1.4301  or  1.4401 with laminaes welded totally coated with NITEK

ABRASIVE / CORROSIVE MATERIALS

STATOR : cast-iron EN GJS 400/15  or steel casting in 1.1730.
SIDES : cast-iron EN GJS 400/15  or steel casting in 1.1730.
ROTOR : Steel casting in 1.1730

PARTICULAR MATERIALS (CHEMICAL FIELD)
STATOR: Steel casting in 1.4301 or 1.4401 HF
SIDES:  Steel casting in 1.4301 or 1.4401 HF

ROTOR: steel casting 1.4301 / 1.4401 with laminaes welded.

Supply available also with NITRURAZIONE IONICA surface coating.

Note: THE STANDARD PRODUCTION OF ATEX CERTIFIED VALVES IS PLANNED IN CAST IRON EN GJS 400/15 .
ON REQUEST IS AVAILABLE ALSO IN STAINLESS STEEL ANSI 304 - ANSI 316 - C40 - C45