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NHÀ PHÂN PHỐI LESER VIÊT NAM Số 1, đường DC 3, P.Sơn Kỳ, Q.Tân Phú, TP.HCM HCM   Điện thoại: (+84) 84 5 365 365 Email: dieukhienvietcom@gmail.com 

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 N DN 441 ANSI clos...

Change-over Valves are used when a plant shutdown is impossible or undesirable for process engineering or commercial reasons. With change-over valves, it is possible to switch over between parallel safety valves without interrupting operation, so as, for example, to perform maintenance work. The design of the change-over valves ensures: low pressure losses on discharge flow (3% criterion) adequate open passage in any position during the change-over process stable operation of the downstream safety valves The combination of LESER change-over and safety valves has been comprehensively tested on full flow test labs. There are two series available:  Type 310: Cast construction DN 25…50/ NPS 1″…2″ Applications: Continuously Functioning Plant Bitumen refineries Oilfields Ethylene plants Application Required by National Standards TRB 801 Nr. 14 for refrigeration systems TRB 801 Nr. 26 for technical gases below -10°C (14°F) TRB 801 Nr. 27 for liquid gas systems Type 311: Welded constr...

In chemical plants, critical service conditions and media may occur which place special demands on the design of safety valves, e.g. Highly Corrosive Media Highly Toxic Media High Back Pressure LESER have developed three series of safety valves for these applications: Type 447: Safety valve with full PTFE lining for protection from highly corrosive media. The PTFE bellow is gastight and back-pressure compensated. Adherence is avoided by the smooth PTFE surfaces. Applications: Chlorine manufacture and processing Reducing acids (e.g. hydrochloric acid, acetic acid) Alkalis (e.g. NaOH solution) Type Set Pressure Range Flange ANSI B 16.5 Flange DIN 2501 (bar) (psig) PR NPS PN DN 447 0.1…16 1.5…235 #150 1″…4″ 16 25…100 Product Overview API Series (Type 526) Clean Service (Type 483, 484, 485, 488) Compact Performance (Type 437, 459/462) High Performance (Type 441/442) Critical Service (Type 447) Change Over Valves (Type 310, 311)

In August 2010, LESER will introduce a new product series: the pilot-operated safety valve. Both pop-action (Series 810) and modulate-action valves (Series 820) are available. The typical application areas of the pilot-operated safety valve (POSV) are refineries and gas processing plants, compressors in gas pipeline systems and offshore applications. The own-media-controlled POSV offers the advantage that the plant can be run close to the set pressure of the valve. This leads to an increase in the capacity utilization and consequently of the efficiency of the plant. Furthermore, POSVs allow higher external back pressures than spring-loaded safety valves. By means of the harmonized standard DIN EN ISO 4126-4 pilot-operated safety valves are now also approved in Europe. For decades already their technology has been proven in the American market and in the Middle East. The LESER POSV will be available with a short 4 week lead time ex works. As a special design feature, the tubing b...