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English to Italian: Valves General field: Tech/Engineering Detailed field: Mechanics / Mech Engineering
Source text - English Butterfly Valve Bodies
- Bodies require minimum space for installation (figure 3-9).
- They provide high capacity with low pressure loss through the valves.
- Butterfly valve bodies offer economy, particularly in larger sizes and in terms of flow capacity per investment dollar.
- Conventional contoured disks provide throttling control for up to 60-degree disk rotation. Patented, dynamically streamlined disks suit applications requiring 90-degree disk rotation.
- Bodies mate with standard raised-face pipeline flanges.
- Butterfly valve bodies might require high-output or large actuators if the valve is big or the pressure drop is high, because operating torques might be quite large.
- Units are available for service in nuclear power plant applications with very stringent leakage requirements.
- Standard liner can provide good shutoff and corrosion protection with nitrile or PTFE liner.
- Standard butterfly valves are available in sizes through 72-inch for miscellaneous control valve applications.
Smaller sizes can use versions of traditional diaphragm or piston pneumatic actuators, including the modern rotary actuator styles. Larger sizes might require high-output electric or long-stroke pneumatic cylinder actuators. Butterfly valves exhibit an approximately equal percentage flow characteristic. They can be used for throttling service or for on-off control.
Soft-seat construction can be obtained by using a liner or by including an adjustable soft ring in the body or on the face of the disk.
Translation - Italian Corpi di valvole a farfalla
- I corpi richiedono uno spazio minimo per l’installazione (figura 3-9).
- Essi forniscono una grande capacità con una perdita di pressione minima attraverso le valvole.
- I corpi di valvole a farfalla offrono un risparmio, in particolare le misure più grandi e in termini di portata per dollaro investito.
- I dischi sagomati convenzionali forniscono un controllo dello strozzamento per una rotazione massima del disco di 60 gradi. I dischi brevettati, dinamicamente ottimizzati, sono adatti ad applicazioni che richiedono una rotazione di 90 gradi.
- I corpi si accoppiano attraverso flange a gradino standard per condotte.
- I corpi delle valvole a farfalla potrebbero richiedere l'uso di attuatori grandi o ad alto rendimento se la valvola è grande o se la caduta di pressione è alta, in quanto le coppie di esercizio potrebbero essere abbastanza elevate.
- Sono disponibili unità per l’utilizzo nelle applicazioni in centrali nucleari con requisiti di tenuta molto rigorosi.
- Il rivestimento standard può offrire una buona tenuta e protezione dalla corrosione, grazie all'utilizzo di nitrile o PTFE.
- Le valvole a farfalla standard sono disponibili in misure fino a 72 pollici per applicazioni di vario genere come valvole di controllo.
Le misure più piccole possono utilizzare versioni di attuatori pneumatici a diaframma o a pistone, tra cui i moderni modelli ad attuatore rotante. Le misure più grandi potrebbero richiedere attuatori a cilindro elettrici ad alto rendimento o pneumatici a corsa lunga. Le valvole a farfalla mostrano una caratteristica di flusso approssimativamente equipercentuale. Esse possono essere usate per lo strozzamento o per un controllo di tipo apertura/chiusura.
Si può ottenere una configurazione a sede morbida usando un rivestimento o aggiungendo un anello morbido regolabile nel corpo o sulla parte anteriore del disco.
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