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With more than 1,050 employees and 130,000 safety valves produced per year, LESER is the largest manufacturer of safety valves in Europe and one of the leading companies in its industry worldwide.

LESER offers spring loaded and pilot operated safety valves for all industrial applications according to the Pressure Equipment Directive and ASME XIII. Major companies in the chemical, oil and gas, petrochemical, energy, technical gases, LNG/LPG, pharmaceutical, food and beverage, shipbuilding and heating and air conditioning industries use LESER safety valves.

LESER safety valves are developed for the international market in Hamburg and manufactured in the modern plant in Hohenwestedt/Germany. In addition, LESER produces safety valves to the same standards in India and China for the local markets. Nine subsidiaries and offices in Europe, America, the Middle East and Asia as well as authorized contacts in over 80 countries guarantee competent customer advice and fast, reliable deliveries.

With more than 1,050 employees and 130,000 safety valves produced per year, LESER is the largest manufacturer of safety valves in Europe and one of the leading companies in its industry worldwide.

LESER offers spring loaded and pilot operated safety valves for all industrial applications according to the Pressure Equipment Directive and ASME VIII. Major companies in the chemical, oil and gas, petrochemical, energy, technical gases, LNG/LPG, pharmaceutical, food and beverage, shipbuilding and heating and air conditioning industries use LESER safety valves.

LESER safety valves are developed for the international market in Hamburg and manufactured in the modern plant in Hohenwestedt/Germany. In addition, LESER produces safety valves to the same standards in India and China for the local markets. Twelve subsidiaries and offices in Europe, America, the Middle East and Asia as well as authorized contacts in over 80 countries guarantee competent customer advice and fast, reliable deliveries.

Well-known companies worldwide rely on LESER safety valves. With its sole focus on overpressure protection, the safety valve specialist LESER is one of the international market leaders.

In addition to the small installation space of the above-mentioned compressors, they should be completely covered by an acoustic enclosure to reduce noise emissions. In order to reduce the size of the very cost-intensive sound enclosure, AERZEN requires special valves that are adapted to the available small installation space. Compressors are discontinuous machines for pressure generation.

In order to ensure that occurring pulsations do not impair the function of the safety valve, the set pressure of the valve is adjusted accordingly and an appropriate distance to the pressure line is ensured by design.

The LESER solutionAs a renowned manufacturer of safety valves, it is advantageous to be able to react flexibly to the above-mentioned concerns, primarily to the small installation space, with its portfolio. Being able to change the installation position of safety valves is a clear advantage for the compressor designer. They are much more variable in their design and construction options and can also respond more flexibly to special customer specifications. If the progressive modularization of compressors requires more compact designs, safety valves in different mounting positions, for example, can be an answer to the problem, unlike the classic upright position. In addition, the spindle guide plays a special role here. The friction at the guiding points must be reduced as much as possible so that the spindle runs smoothly. Otherwise, a safety valve can only be installed vertically.

Why LESER safety valves?For a global acting OEM like AERZEN, a specialist like LESER, who has not only the knowledge but also the necessary approvals, is an important component for success. LESER offers a global approval concept that allows safety valves to be used regardless of location. When ordering safety valves, only the applicable regulations must be specified in order to ensure appropriate labeling and material selection. In addition, LESER has tested and approved further installation positions in addition to the conventional installation situation, standing on the inlet pipeline. For example, some types of valves may be installed with a horizontal stem or even upside down, e.g. Types 526 and 441. For horizontal installation, care must be taken to align the outlet. Liquids, e.g. in the form of condensate, should be able to drain off downwards to avoid back pressures and even corrosion. When installed upside down, the inverted weight forces are corrected by correction factors. LESER offers not only safety valves with basic documentation and accessories but also other special documentation and options. From the “Fugitive Emission Test” with helium up to 3.2 ship class castings 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.

The liquefaction process must be designed efficiently so that the LNG can be offered economically. The necessary cryogenic media temperatures of -161 to -164 °C represent a challenge for the technical design of the individual components in the plant. This also applies in particular to the safety valves, which must function reliably as the final protection in the event of overpressure, even at the cryogenic process and Russian ambient temperatures.

LESER valves meet all requirements for use in natural gas liquefaction plants and offer a complete product range. The valves are designed in the low-maintenance “Durable Design” and can be adapted to the plants by various options.

The tightness of the safety valves has been proven under real conditions at media temperatures below -146 °C on LESER’s own cryogenic test bench. The precise helium leak test is based on the DIN EN 13648-1 standard.

The plant efficiency was supported by the use of pilot-operated safety valves (POSV) in the relevant areas. In contrast to spring-loaded safety valves, they are tight until they respond and thus meet the requirement of a higher operating pressure in relation to the response pressure of the plant. Six POSVs now support the efficiency of LIMUM® technology the liquefaction plant.

The LESER POSV for LNG is based on the proven design for LPG applications - Liquefied Petroleum Gas, which has been in use for many years as a standardized solution.

For the LNG low temperature range, LESER has further developed the design modularly so that it can be adapted to the respective project requirements. In the plant in Russia, for example, an evaporator was used and the pilot was thermally decoupled from the main valve to ensure a gaseous media state in the pilot. A temperature-resistant PTFE compound for piston sealing in the main valve enables the spring-loaded lip seal to be used at operating temperatures as low as -162 °C. The main valve is equipped with a PTFE compound for the sealing of the piston. The special seat bushing design does not require a soft seal in the wetted inlet area. The controlling pilot valve is available with a low-temperature resistant soft seal in Pop Action and Modulate Action versions for various requirements.

LESER’s project department supported Linde from the first FEED phase to the commissioning of the project. The production segment “Project Assembly” is specially designed for the requirements of projects and offers optimal conditions for customer acceptance.

Why did the customer choose LESER products?Linde relies on LESER’s know-how in the cryogenic market, for example in projects with temperatures down to -269 °C for liquid helium applications. The company has been working with LESER in the field of technical gases for many years and knows their services very well. The joint experience in the project management of air separation plants and the complete LNG product range, in particular the modular Cryo-POSV in the Pop Action version, were important for Linde.

W&O, a global supplier to the marine and upstream oil and gas markets for pipe, valves and fittings, valve automation, and engineered solutions, has partnered with LESER in an exclusive distribution agreement to bring its safety relief valves to the United States maritime industry. This marks W&O’s first exclusive distribution agreement with a direct original equipment manufacturer of safety relief valves in the company’s 40-year history.

“W&O is excited to announce this partnership with LESER, and to do so at one of the industry’s marquee events, the International WorkBoat Show”, said Michael Hume, president and CEO of W&O. “The LESER safety relief valves are German-engineered and manufactured, and will be an excellent addition to the tank venting solutions we currently bring to our customers. This partnership is a natural fit for W&O, as LESER is equally committed to meeting customer needs, providing the highest quality product and engineering solutions to fit specific applications.”

The W&O and LESER partnership will prove very beneficial to customers for numerous reasons, including: short delivery times due to high stock of raw material and finished goods at the Charlotte, North Carolina, LESER facility, a variety of solutions from eight product groups and 40 safety relief valve types, and customer support offered by both companies.

The Leser Flanged Safety Relied Valve Series in accordance to API 526 are designed to meet all applications which require API. These valves open rapidly with an overpressure of max. 10% to full design lift and have a maximum blowdown of 7% for steam/gas service and 20% for liquid service. Service for protection of processes and equipment.

With almost 200 years of history, LESER has manufactured its safety valves to reflect state-of-the-art design and developed a product range to provide solutions for all sectors of industry. Customer satisfaction is the impetus behind LESER’s progress. LESER defines its products based on 7 pillars of achievement; rapid availability, product range, global network, quality, reliability, price and sustainability.

In September, LESER – the largest manufacturer of safety valves in Europe, hosted the Experience Days at the LESER-Kontor in Hamburg as part of its 200th year of existence. With more than 300 participants from 55 nations, the conference was very international and well attended.

The global isolation and safety valve market is expected to grow at a significant pace by 2023. One of the important factors contributing to market growth is the tremendous rise in the oil & gas sector especially in Asia-Pacific countries such as India and China.

Rising trend for the use of customized isolation and safety valves in the market on account of as a lack of product differentiation has been leading to increasing competition among vendors. Thus, local as well as international vendors have been trying to differentiate every product through customized valves which are offered at reasonable prices to the customers. This trend will influence the growth of the industry significantly over the next years.

The focus the Experience Days was on a conference with lectures on current topics of overpressure protection. Under the headlines ‘Plant Safety & Digitalization’, ‘From Market to Product’ and ‘Safety Valve Technology’, topics were presented in three parallel lectures so that each participant could make the appropriate choice.

“This event is the meeting place for the world of overpressure protection,” says Christian Joachim Schult, Head of Marketing at LESER, when asked what the Experience Days are all about.

In the main series of lectures ‘Plant Safety & Digitalization’ speakers from Linde, BASF, an upstream valve consultant from Brazil and experts from LESER presented their experiences and points of view. The aim of this format was to give a holistic view of the overpressure protection and its process steps from engineering to production and application in the plant by the responsible parties themselves.

In the lecture series ‘From Market to Product’, LESER presented various topics around the market, the development and production of safety valves. Especially the talk about the upcoming changes in the ASME regulations ‘An outlook on ASME Sec. XIII’ and the presentation of the LESER production concept ‘Fast deliveries and integrated quality’ aroused the interest of the visitors.

More than 150 participants took advantage of the supplementary factory tour to gain a deeper insight into the modern production facility in Hohenwestedt. In the third lecture series ‘Safety Valve Technology’, LESER presented the current status of safety valve technology to between 30 and 40 interested participants in three sessions. During the entire conference, safety valves were shown in operation in the new LESER Chatroom and in the in-house test lab.

The closing event was a panel discussion on digitization between representatives of Linde, BASF and LESER. The question of what digitization means for the overpressure protection of process plants was discussed. An outlook was given on the changing environment not only for safety valves, but also for employees through digital transformation. It is about “to share the ideas and think about it, if we are on the right way,” commented Carsten Stubenrauch, Head of Plant Design at Linde AG.

Finally, a joint evening event was held with all participants of the Experience Days at the Museum for Hamburg History. The museum is connected to the 200-year existence of LESER by parts of the present stone façade, which were once part of the first LESER building in the ‘Neustädter Fuhlentwiete’ in Hamburg, which no longer exists today. On this occasion, Martin Leser, spokesman for the members, also welcomed the participants and said: “To become 200 years old is not an achievement, but it is an achievement to host the Experience Days” and thus to offer the participants this industry and process-spanning exchange opportunity.

With 950 employees and 130,000 safety valves produced per year, LESER is the largest manufacturer of safety valves in Europe and one of the leading companies in its industry worldwide.

LESER offers spring loaded and pilot operated safety valves for all industrial applications according to the Pressure Equipment Directive and ASME VIII. Major companies in the chemical, oil and gas, petrochemical, energy, technical gases, LNG/LPG, pharmaceutical, food and beverage, shipbuilding and heating and air conditioning industries use LESER safety valves.

LESER safety valves are developed for the international market in Hamburg and manufactured in the modern plant in Hohenwestedt/Germany. In addition, LESER produces safety valves to the same standards in India and China for the local markets. Eight subsidiaries in Europe, America, the Middle East and Asia as well as authorized contacts in over 80 countries guarantee competent customer advice and fast, reliable deliveries.