Ing. Mecanico

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
Series441
Type 441, 442 DIN
H 2S O 4

Critical
Service

Type 441, 442 ANSI

HNO3
NH3
HCL

Series XXL

Modulate
Action

Best
Availability

Type 441, 442 XXL

Series 444
Type 444 DIN
Type 444 ANSI

to
refer
ease rmance
Pl
Perfo
High atalog 1
C

Type 441, 442
Full nozzle ANSI
Valve size 1" – 4"
Set pressure 0,1 – 51 bar, 1,5 – 740 psig
Flanges according to ASME B16.5Type 455, 456
DN 25 – 100, 1" – 4"
Set pressure 2,5 – 100 bar, 36 – 1450 psig
Flanges according to DIN EN 1092 and ASME B16.5

Type 457, 458
DN 25 – 150, 1" – 6"
Set pressure 2,5 – 300 bar, 36 – 4350 psig
Flanges according to DIN EN 1092 and ASME B16.5

General
Type 441, 442 Full nozzle DIN
Type 441, 442 Full nozzle ANSI

DN 20, 40, 50
Set pressure 0,1 – 40 bar, 1,5 – 580 psigFlanges according to DIN EN 1092

Type 456, 456

Type 441, 442
Full nozzle DIN

Type 457, 458

General

Options

Options

Contents
Overview

Chapter/Page

General
Applications, General design features
Valve finder
Valve selection

How to use:
Determination of coefficient of discharge Kdr / α w
How to use: Capacity sheets

00/09

LESER Effective Orifice LEOS/G00/11

LESER Effective Orifice LEOL

00/12

Sour gas service

00/13

07/14
07/15
07/16

Approvals
Capacities
• Steam
• Air
• Water

00/08

07/12
07/13

Flange drillings and facings
Order information – Spare parts
Available options

00/07

07/10
07/11

Pressure temperature ratings
• Metric Units
• US Units

00/05

How to use:
Signs and symbols, Flange drillingsand facings

07/06
07/08

Dimensions and weights
• Metric Units
• US Units

00/03

07/02
07/04

How to order
• Numbering system
• Article numbers

00/02

07/01

Materials
• Conventional design
• Balanced bellows design

00/01

Type 441, 442 Full nozzle ANSI

07/17
[Metric Units + US Units]
[Metric Units + US Units]
[Metric Units + US Units]

07/18
07/19
07/20Determination of coefficient of discharge Kdr /α w

LESER Type

07/21

Chapter/Page

Type 441, 442 Full nozzle DIN

06/01

Type 455, 456

08/01

Materials
• Conventional design
• Balanced bellows design

06/02
06/04

Materials
• Conventional design
• Balanced bellows design

08/02
08/04

How to order
• Numbering system
• Article numbers

06/06
06/08

How toorder
• Numbering system
• Article numbers

08/06
08/08

Dimensions and weights
• Metric Units
• US Units

06/10
06/11

Dimensions and weights
• Metric Units
• US Units

08/10
08/11

Pressure temperature ratings
• Metric Units
• US Units
Flange drillings and facings
Order information – Spare parts
Available options
Approvals

06/12
06/13
06/14
06/15
06/16
06/17Pressure temperature ratings
• Metric Units
• US Units

08/12
08/13

Capacities
• Steam
• Air
• Water

06/21

Determination of coefficient of discharge Kdr /α w

08/14
08/15
08/16
08/17

06/18
06/19
06/20

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

Flange drillings and facings
Order information – Spare parts
Available optionsApprovals
Capacities
• Steam
[Metric Units + US Units]
• Air
[Metric Units + US Units]
• Water
[Metric Units + US Units]
Determination of coefficient of discharge Kdr /α w

08/21

talog
to ca 1
refer
s 44
Serie

08/18
08/19
08/20

talog
to ca 4
refer
s 44
Serie

Type 441

Type 441

Type 441

Type 444

Cap H2
Closed bonnet
Conventional design

Packed lever H4...