High Performance

 Safety valves for all industrial applications
  • The standard safety valve for chemical plants in Europe
  • Easy maintenance
  • High performance in relation to the nominal size
  • Nominal inlet diameters from DN 20 / ¾“ to DN 400 / 16“ with wide range of options
  • Good price-performance ratio
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High Performance safety valve from LESER

Technical data High Performance

Set pressure

0.1 - 300 barg | 1.5 - 4,350 psig

-270 - 550 °C | -454 - 1,022 °F
Orifice F- to X
Connections DIN EN 1092

DN 20 to DN 400
Connections ASME B16.5

NPS 3/4 to NPS 16

Body material

Gray cast iron, nodular cast iron, carbon steel , high-temperature carbon steel , stainless cast steel
Saipem Spa_inv
Aerzener Maschinenfabrik_inv
Saipem Spa_inv
Aerzener Maschinenfabrik_inv
Oil Refinery at Twilight
Case study

The hanging valves of Aerzen



OEM for various industries

LESER products

High Performance and API


Restricted installation space due to modulized design


The challenge:

As an internationally active OEM Aerzener Maschinenfabrik has to fulfill a multitude of local, legal requirements as well as customer specifications, e.g. of pressure equipment. Each region has its own set of regulations: For example, the Pressure Equipment Directive applies in Europe and the ASME Code in America. In addition to the general requirement for global approval concepts, e.g. for pressure equipment according to PED or ASME, the trend among companies is toward modular systems. Planners are trying to use small, interconnectable systems to be able to work flexibly and scalably. This makes it easier to coordinate plant capacities. This modularization considerably restricts the installation space and freedom in the design and development of compressors, for example.

In addition to the small footprint of compressors required above, it should be completely enclosed by a sound hood to reduce noise emissions. To reduce the size of the very
AERZEN requires special valves that are adapted to the small installation space available.
are. Compressors are discontinuous machines for generating pressure. To ensure that pulsations do not impair the function of the Safetys valve , the test pressure is set accordingly on the valve and an appropriate distance from the discharge line is ensured by design.

The LESER solution
As a renowned manufacturer of Safetys valves , it is advantageous to be able to react flexibly to the above-mentioned concerns, i.e. primarily the small installation space, with its portfolio. Being able to change the installation position of Safetys valves is a clear advantage for the compressor designer. He is much more variable in his construction and design options and can also respond more flexibly to special customer specifications. If the progressive modularization of compressors calls for more compact designs, safety valves in different installation positions, for example, can be an answer to the problem, as opposed to the classic upright position. In addition, the spindle guide plays a special role here. The friction
at the guide points must be reduced as far as possible so that the spindle moves easily. Otherwise, a Safetys valve can only be installed in an upright position.

Why LESER Safetys valves ?
For a globally active OEM, such as AERZEN, a specialist like LESER , who not only has the knowledge but also the necessary approvals, is an important building block to the
Success. LESER offers a global approval concept through which Safetys valves can be used regardless of location. When ordering Safetys valves , it is basically only necessary to specify the applicable regulations in order to ensure appropriate labeling and material selection. In addition, LESER has tested and approved other installation positions besides the conventional installation situation, standing on the inlet pipe . Thus, for some type n of valves , installation with a horizontal spindle or even suspended installation is permitted, e.g. for the type n 526 and 441. For horizontal installation, attention must be paid to the orientation of the outlet . Fluids , e.g. in the form of condensate, should be able to drain off downwards to avoid back pressures and even corrosion. For upside-down installation, the inverted weight forces are compensated by correction factors.
LESER offers not only Safetys valves with basic documentation and accessories but also other special documentation and options. From "Fugitive Emission Test" with helium up to 3.2 ship class casting and from back pressures up to more than 200 bar-g to high pressure heating jackets for up to 30 bar-g LESER sales engineers develop solutions for customer specific applications as described above for AERZEN.

Valve Types

Choose the product type that suits you

High Performance safety valves for all industrial applications

High Performance safety valves for high pressure applications
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High Performance Catalog

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Calculation of safety valves with LESER-Valvestar

Sizing and selection

Sizing and selection of your LESER Safety valve with VALVESTAR® - The Sizing Program


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