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346

Product catalog summary

Main Components and Materials:

Body: Made from P250 GH (forged) for sizes 15-50 and GP 240 GH+N (cast) for sizes 65-250.
Yoke: Available in P250 GH (forged) and GP 240 GH+N (cast).
Seat, Disc, Stem, Bellows, Antifriction Disk: Constructed from various grades of stainless steel.
Gaskets and Packing: Made from graphite and stainless steel.
Handwheel, Studs, Nuts: Made from pressed steel and carbon steel.

Main Standard Features:

Stop screw and maintenance-free carbon steel streamlined flow valve with bellows.
TA-Luft approved with optional rise limiter and lubricator.
Includes backseat, double anti-friction bearings, rotating disc, and welded seat.

Applications:

Suitable for heat transfer systems, thermal power stations, industrial boilers, district heating plants, and diathermic oil installations.
Handles hot water, overheated water, steam, air, and diathermic fluids.

Technical Specifications:

Pressure rating: PN 40.
Temperature range: -10°C to 400°C with corresponding pressure limits.
Available sizes (DN): 15 to 250 mm with varying dimensions and flow coefficients (Kv).

Working Conditions:

Flow coefficients (Kv) provided for different stroke rates and sizes.
Pressure and temperature limits detailed for various operating conditions.

Disc Variations:

Includes regulating disc, balanced disc, and soft sealing interchangeable PTFE disc.
Special note on installation of balanced disc valves in reverse to handle pressure.

Manufacturing Variations:

Details on different disc types and their specific applications.

Catalog excerpts

Valvola a flusso avviato a vite esterna con soffietto in acciaio al carbonio, esente manutenzione Carbon steel streamlined flow valve outside screw with bellows, maintenance free Caratteristiche principali di serie Main standard features Limitatore di alzata (fornibile a richiesta gratuitamente) Rise limiter (available on request) Stop screw Ingrassatore Lubricator Doppia ralla antifrizione Double anti-friction bearings Indicatore di apertura con funzione antirotazione Opening index with anti-rotatinon function Controtenuta di sicurezza ricavata sullo stelo Backseat Otturatore rotante Rotating disc Sede saldata Welded seat Possibili campi di impiego Application Impianti di trasmissione calore, centrali termiche, caldaie e serbatoi, impianti di teleriscaldamento, applicazioni con olio diatermico, ecc. Heat transfer systems, thermal power stations, industrial boilers and tanks, district heating plants, diathermic oil installations, etc. Acqua calda e/o surriscaldata, vapore, aria, fluidi diatermici, ecc. Hot water and/or overheated water, steam, air, diathermic fluids, etc. Material P250 GH (forged) GP 240 GH+N (cast) P250 GH (forged) GP 240 GH+N (cast) St. Steel 1.4370 St. Steel 1.4021 St. Steel 1.4021 St. Steel 1.4541 St. Steel 1.4021 Graphite + St. Steel Graphite Pressed steel Carbon steel Carbon steel Components Body Body Yoke Yoke Seat Disc Stem Bellows Antifriction disk Gaskets Packing Handwheel Studs Nuts Componente Corpo 15-50 Corpo 65-250 Cavalletto Cavalletto Sede Otturatore Stelo Soffietto Disco antifrizione Guarnizioni Baderna Volantino Prigionieri Dadi

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KV alla percentuale di alzata figura 346/R Kv at stroke rate item 346/R Condizioni di esercizio/ Working conditions Temperatura - Temperature [°C] -10/50 40 Pressione - Pressure [bar] E’ necessario l’uso dell’otturatore equilibrato quando la pressione di esercizio supera i seguenti valori It is necessary to use the balanced disc when the working pressure is over the following values DN Pressione - Pressure [bar] NOTA: Utilizzando una valvola con otturatore equilibrato è indispensabile installarla al contrario, cioè con la pressione sopra l’otturatore NOTE: Using a valve with balanced disc is...

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