Nos soupapes de sécurité

Bienvenue chez Besa, nous concevons et produisons des soupapes de sécurité industrielles pour l’échappement de fluides atmosphériques et liquides.

Domaines d’application

Chimique, pharmaceutique, naval, chaudronnier, pétrochimique, cryogénique, compresseurs à gaz méthane, pompes de dosage, air comprimé, GPL/GNL, papetier.

Homologations et certifications

Système de qualité UNI EN ISO 9001 (ICIM) ; certifications de produit CE PED (Pascal), CE ATEX (ICIM), RINA, EAC, BUREAU VERITAS, DNV-GL. Sur demande, auprès de notre siège, nous pouvons fournir l’assistance complète pour la réalisation d’essais de la part des principaux organismes : INAIL, RINA, DNV-GL, LR, TUV, BV, AB, ASME.

Plages de service

pression de tarage : d’un minimum de 0.2 bar à un maximum de 600 bars, température : d’un minium de –196°C à un maximum de 750°C.

Matériaux de construction

fonte, acier au carbone, acier allié, acier inoxydable. Pour les constructions spéciales, le revêtement en matières thermoplastiques (PFA, PVDF, ETFE, HALAR) est prévu ainsi que l’utilisation d’alliages tels qu’Inconel ®, Hastelloy ®, Monel ®, Duplex.

Dimensions

de DN 15 (1/2”) à DN 250 (10”) à bride, de DN ½” à DN 2” par filetage.

Raccords

Raccords filetés GAZ cylindrique et conique, NPT conique conformément aux normes EN/ANSI/AME ; Raccords “à souder” conformément aux normes ANSI/ASME.

Raccords à bride conformément aux normes EN/ANSI/ASME.

Histoire des entreprises

Fondée en 1946 à Milan par l’ingénieur Antonio Santangelo comme usine de robinetterie, elle s’est ensuite spécialisée dans la conception et la production de soupapes de sécurité obtenues par la fusion pour tout domaine d’application.

Our safety valves

Welcome to Besa, We design and produce industrial safety valves for the discharge of gaseous and liquid fluids.

Fields of application

Chemical, Pharmaceutical, Naval, Boilers, Petrochemical, Cryogenic, Methane Gas Compressors, Metering Pumps, Autoclaves, Compressed Air, LPG/LNG, Paper making

Approval and Certifications

UNI EN ISO 9001 (ICIM) Quality System, CE PED (Pascal), CE ATEX (ICIM), RINA, EAC, BUREAU VERITAS, DNV-GL product certifications. Upon request, we offer full support for testing by major organisations at our headquarters: INAIL, RINA, DNV-GL, LR, TUV, BV, AB, ASME

Intervals of use

calibration pressure: from a minimum of 0.2 bar to a maximum of 600 bar, temperature: from a minimum of –196°C to a maximum of 750°C

Construction materials

cast iron, carbon steel, alloy steel, stainless steel. For special constructions, thermoplastic material coating is used (PFA, PVDF, ETFE, HALAR) as well as alloys such as Inconel®, Hastelloy®, Monel®, and Duplex.

Dimensions

flanged from DN 15 (1/2”) to DN 250 (10”), threaded from DN ½” to DN 2”

Connections

Cylindrical and tapered threaded GAS connections, tapered NPT in accordance with EN/ANSI/AME standards. Connections to be “welded” in accordance with ANSI/ASME standards.

Flanged connections in accordance with EN/ANSI/ASME standards

Company history

BESA is Founded in Milan in 1946 by Engineer Antonio Santangelo as a tap and faucet factory and later specialising in the design and production of safety valves made from castings for all types of use.

la valvola di sicurezza

The safety valve

A safety valve is an accessory which protects pressurised equipments from the overtaking of an admitted pressure limit, being therefore, a device for the emergency discharge of pressurised fluids, designed to act automatically when a set pressure is reached (valve set pressure).

How a safety valve works

  1. The pressure applied by process medium inside the valve body acts on the disc surface, generating a force F.
  2. When F reaches the same intensity of the spring’s force (spring is fitted inside the valve and previously adjusted by compression to a set value) the disc begins to lift from the seat/nozzle tightness area and the process medium starts flowing (this is not anyway, the valve’s maximum flow rate).
  3. At this point normally, the upstream pressure keeps raising, causing with an increase of about 10%-(named overpressure) over the set pressure , the sudden and complete disc lift which lets the process fluid pass through the valve’s minimum section.
  4. When the safety valve capacity is equal to the flow rate to be discharged, the pressure inside protected equipment, is kept constant. Otherwise if safety valve is capacity is higher than the flow rate to pass, the pressure inside the equipment tends to decrease. When this occurs, the disc, on which the spring force keeps acting, begins to reduce its lift (i.e the distance between seat and disc) until the valve’s flowing section would be closed (generally a decrease – named blowdown- equal to 10 % less than set pressure) and the process fluid stops blowing.