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High
Performance
Flanged Safety Relief Valves Series 441 Full nozzle Series 458

CATALOG 2
The-Safety-Valve.com

Product Range
LESER Safety Valves for every industrial application

High Performance
Compact Performance
Series 441 Full nozzle Type 441, 442 Full nozzle DIN Type 441, 442 Full nozzle ANSI

API
Series 458 Type 455, 456 Type 457, 458

Clean Service
Series 441 Type441, 442 DIN
H 2S O 4 HNO3 NH3 HCL

Critical Service

Type 441, 442 ANSI

Series XXL

Modulate Action

Type 441, 442 XXL

Best Availability

Series 444 Type 444 DIN Type 444 ANSI

to refer ease rmance Pl Perfo High atalog 1 C

General Type 441, 442 Full nozzle DIN
DN 20, 40, 50 Set pressure 0,1 – 40 bar, 1,5 – 580 psig Flanges according to DIN EN 1092

Type 441, 442 Full nozzleANSI
Valve size 1" – 4" Set pressure 0,1 – 51 bar, 1,5 – 740 psig Flanges according to ASME B16.5

DN 25 – 100, 1" – 4" Set pressure 2,5 – 100 bar, 36 – 1450 psig Flanges according to DIN EN 1092 and ASME B16.5

DN 25 – 150, 1" – 6" Set pressure 2,5 – 300 bar, 36 – 4350 psig Flanges according to DIN EN 1092 and ASME B16.5

Options
Options

Type 457, 458

Type 457, 458

Type 456, 456Type 455, 456

Type 441, 442 Full nozzle ANSI

Type 441, 442 Full nozzle DIN

General

Contents
Overview
General
Applications, General design features Valve finder Valve selection How to use: Signs and symbols, Flange drillings and facings How to use: Determination of coefficient of discharge Kdr / α w How to use: Capacity sheets LESER Effective Orifice LEOS/G LESER EffectiveOrifice LEOL Sour gas service

Chapter/Page 00/01
00/02 00/03 00/05

Type 441, 442 Full nozzle ANSI
Materials • Conventional design • Balanced bellows design How to order • Numbering system • Article numbers Dimensions and weights • Metric Units • US Units Pressure temperature ratings • Metric Units • US Units Flange drillings and facings Order information – Spare parts Available optionsApprovals Capacities • Steam • Air • Water

07/01
07/02 07/04 07/06 07/08 07/10 07/11 07/12 07/13 07/14 07/15 07/16 07/17

00/07

00/08 00/09 00/11 00/12 00/13

[Metric Units + US Units] [Metric Units + US Units] [Metric Units + US Units]

07/18 07/19 07/20 07/21

Determination of coefficient of discharge Kdr /α w

LESER Type
Type 441, 442 Full nozzle DIN
Materials • Conventional design •Balanced bellows design How to order • Numbering system • Article numbers Dimensions and weights • Metric Units • US Units Pressure temperature ratings • Metric Units • US Units Flange drillings and facings Order information – Spare parts Available options Approvals Capacities • Steam • Air • Water [Metric Units + US Units] [Metric Units + US Units] [Metric Units + US Units]

Chapter/Page 06/0106/02 06/04 06/06 06/08 06/10 06/11 06/12 06/13 06/14 06/15 06/16 06/17 06/18 06/19 06/20 06/21

Type 455, 456
Materials • Conventional design • Balanced bellows design How to order • Numbering system • Article numbers Dimensions and weights • Metric Units • US Units Pressure temperature ratings • Metric Units • US Units Flange drillings and facings Order information – Spare parts Availableoptions Approvals Capacities • Steam [Metric Units + US Units] • Air [Metric Units + US Units] • Water [Metric Units + US Units] Determination of coefficient of discharge Kdr /α w

08/01
08/02 08/04 08/06 08/08 08/10 08/11 08/12 08/13 08/14 08/15 08/16 08/17 08/18 08/19 08/20 08/21

Determination of coefficient of discharge Kdr /α w

talog to ca 1 refer s 44 Serie

talog to ca 4 refer s 44Serie

Type 441
Cap H2 Closed bonnet Conventional design

Type 441
Packed lever H4 Closed bonnet Conventional design

Type 441
Plain lever H3 Closed bonnet Conventional design

Type 444
Packed lever H4 Closed bonnet Conventional design

Type 441
Cap H2 Closed bonnet Balanced bellows design

Type 442
Plain lever H3 Open bonnet Conventional design

Type 444
Cap H2 Closed...
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