Type 441/442
Full Flanged Safety Relief Valve with Flanged Connections
Full lift safety valves open rapidly within an overpressure of 5% to the full design lift.
They are used in particular for vapours and gases, in applications where the maximum mass flow has to be discharged rapidly.
LESER type 441 is suitable for almost any industrial application, and are worldwide one of the best selling spring-loaded flange type safety valves.
There are four series available:
Type 441 ANSI:
Cast steel construction with ANSI flanges.
Two body materials: stainless steel and cast steel.
Center to face length in accordance with API 526, greater discharge capacity than standard API valves.
Type 441/442 DIN:
Cast construction with DIN flanges.
Two body materials: stainless steel and carbon steel.
Type 441/442 "XXL":
Robust welded construction with DIN or ANSI flanges.
Welding procedures to EN and ASME standards.
Two body materials: stainless steel and carbon steel.
| Type | Bonnet | Flange ANSI B 16.5 | Flange | Main Characteristic | ||
| PR | NPS | PN | DN | |||
|
441 ANSI |
closed | #150...#300 | 1"...8" | - | - | Cast Construction, semi nozzle |
| 442 ANSI | open | |||||
| 441 DIN | closed | - | - | 16...40 | 20...200 | |
| 442 DIN | open | |||||
| 441 "XXL" | closed | #150...#300 | 8"...16" | 10...25 | 200...400 | Welded construction, full nozzle |
| 442 "XXL" | open | |||||
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Type 441