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FOR SAFETY AND ENVIRONMENTAL PROTECTIONACCESSORIES FOR STORAGE TANK
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Breathing Valves
Pressure-Vacuum Relief Valves (also known as breather valves) are designed according ISO 28300 and API 2000 for installation on low pressure storage tanks to ensure safe filling and emptying operations , and to compensate for any expansion or contraction of vapors above the liquid level due to changes in ambient temperatures .
Our technical department is available to carry out valve sizing according to international standards like "API 2000" and "ISO 28300 ".
Our valves are designed even according to following European Standards that are related to "Atex" directive :
o EN1127-1 : Explosive atmospheres - Explosion prevention and methodology
o ISO 80079-36 and 80079-37 : Non-electrical equipments for explosive atmospheres
In order to make easy control and maintenance activities , all our Pressure-Vacuum Relief Valves are designed with pressure side and vacuum side well distinct one from the other .
All valves are submitted to rigorous seal and set pressure , furthermore we would like to remark the fact that all flow capacity features are real in fact our inhouse air capacity testing plant enables valves from size 2" to 12" to be capacity tested in the range between +/- 22 and +/- 700 mmWG .
All valves are equipped with teflon f.e.p.+ p.t.f.e. diaphragms , other materials are also available on request .
All valves may be required with proximity sensors to be connected to control room in order to detect valve opening .
Five ranges are available .
Aluminium Casted available in the following execution “SWV” : available in the sizes from 2” up to 12” is bound for plants where are not present high corrosive process fluid . In this execution body and covers are in casted aluminium while seats and trim are in stainless steel in order to avoid that oxide on the seat surface may compromise valve tightness .
This execution is coated by epoxidic paint.
Steel casted available in two executions :
-EWW with casted carbon steel A216WCB body . This execution is coated by polyurethanic paint for carbon steel parts .
-WWW with CF8M (AISI316) body . Sandblasting SA 2 ½ is the finish foreseen for this execution .
Both executions have seats and trim in stainless steel AISI316 .
This kind of valve is available in sizes 2”, 3” and 4” and are usually delivered in short time .
400 Series : fabricated stainless steel 316L bodies and available under request in a wide range of exotic alloys (Nickel alloys etc…) . Available in the sizes from 2” up to 12” is bound for petrochemical and chemical plants and where corrosive process fluid are present . Thanks to modular way , they are designed , it is possible fitting them with a steam jacket .
Sandblasting SA 2 ½ is the finish foreseen for this execution .
700 Series : fabricated stainless steel 316L bodies available in sizes 2” , 3” , 4” , has a modular design as each side is interconnected by tri-clamp connections . They are supplied with electro-polishing bright finish . Its design cares of self-draining feature to satisfy chemical and pharmaceutical industries .
Spring Loaded Valves
All kind of valves mentioned above are weight loaded , however in order to increase the setting range from 100 to 490 mbarg we propose for valves series 400 and 754 a peculiar spring loading system , named by us “bow springs” , that offers an almost linear ratio load-deformation quite similar to weight loaded system . In this way “bow springs” loaded valves work with a consistent lift of the disc (pallet) that allows to get high flow capacities .
Flow capacities diagrams for “Bow Spring loaded valves” are obtained from tests carried out by “Politecnico University of Milan”.
Polypropylene series : fabricated polypropylene bodies , recall series 400 design , available in sizes 2” , 3” , 4” are bound for chemical industry where are handled corrosive process fluid like Hydrochloric acids etc…
This execution is supplied with natural finish .
Cast aluminum breathing valves
Molten breathing valve in steel
Breathing Valve Stainless steel
SERIES cast aluminum
Proposed in diameters from 2 "to 12" is intended for the oil industry and other areas where there are normally no highly corrosive fluids. It has the cast aluminum body and stainless steel interior, thus eliminating the oxidation problem on the seats and thus ensuring a good seal even after a long service life. Epoxy paint protection is provided for the surfaces of all aluminum parts.
SERIES molten steel in 2 ", 3" and 4 "diameters in two versions:
EWW with carbon steel body ASTMA216 WCB and stainless steel 316.
For this design, the polyurethane paint protection for carbon steel parts is provided.
WWW with stainless steel body CF8M (AISI316) and stainless steel 316.
Natural surface finishing.
Both versions have stainless steel AISI316 interior. These implementations allow reduced delivery times with respect to the welded body models shown below.
SERIE 400 WW
In stainless steel AISI316L with welded body.
To be used with corrosive fluids normally present in the petrochemical, chemical and pharmaceutical industry. They are also indicated in some applications in the food industry. Thanks to the concept of modular construction all valves of this range can be equipped with a heating shirt (steam shirt). For this execution, the surface finish expected is SA 2 ½ sandblasting.
Breathing Valve Stainless steel
SERIE 400 WW BS
AISI 316L stainless steel with welded body and spring calibration system.
To be used with corrosive fluids normally present in the petrochemical, chemical and pharmaceutical industry. They are also indicated in some applications in the food industry. For this execution, the surface finish expected is SA 2 ½ sandblasting.
Breathing Valve Stainless steel
SERIE 700 in diameters 2 ", 3" and 4 ":
In AISI316L stainless steel, modular, with components with tri-clamps.
They are provided with superficial electro-polishing treatment. In planning, the internal drainage capacity for use in the chemical and pharmaceutical industry was well considered.
Breathing Valves in Polypropylene
SERIES in Polypropylene:
Derived from the same design of 400 series available in diameters 2 ", 3", 4 "are intended for installation on highly corrosive fluids such as hydrochloric acid. Natural surface finishing.
