High Efficiency Pilot-Operated Safety Valve
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High Efficiency Pilot Operated Safety Valves Sries 810 - Pop Action Series 820 - Modulate Action CATALOG ru ^ 闗TV^ ^^^^^t The-Safety-Valve.com 1

LESER Safety Valves for every industrial application Product Range Compact Performance High Performance API Clean Service H2SO4 HNO3 NH3 HCL Critical Service Modulate Action Best Availability High Efficiency Series 810 – Pop Action Type 811 Series 820 – Modulate Action Type 821

Product Range TYPE 811 TYPE 821 LESER Type 811 Pop Action pilot-operated safety valves are non-flowing, which minimizes the flow of media through the pilot for decreased emissions and extended valve life. Set pressure is not affected by back pressure. Features: • Set pressures: 36 – 1480 psig, 2.5 – 63 barg • Sizes: 1" x 2" up to 8" x 10" (DN 25 – DN 200) with API Standard Orifices and Extra (full-bore) Orifices • Adjustable blowdown of 3 – 7% • Complete stainless steel construction of pilot valve • Certified for air / gas service (ASME Section VIII, DIN EN ISO 4126, AD 2000-Merkblatt) Soft...

How to Find the Right Product Group Valve Finder No No No No No No Critical Service Clean Service Best Availability Mediumcontrolled Changeover valve Bursting disc Spring loaded Safety Valves High operating to set pressure ratio, high backpressure or low total height? Clean Service application? Critical Service / highly corrosive application? API specified application? Additional components beyond safety valves Steam, gas and liquid application with low capacity in relation to valve size? High Performance API Compact Performance Modulate Action High Efficiency Orifice F Yes Yes Yes Yes Yes...

LWN 487.71-E 00/02 Contents Chapter/Page General Valve Finder 00/01 Chapter/Page Sizing & Selection How to Construct the Article Number 02/01 How to Construct the Remaining Order Code 02/02 Reference: Identifying the Flange Pressure Rating (ASME) 02/03 Reference: Identifying the Article Number, Series 810 02/05 Reference: Identifying the Article Number, Series 820 02/07 Reference: Application range Soft seal disc / Metal disc 02/09 Reference: • Option Codes for Connections acc. to DIN EN 1092 • Option Codes for Connections acc. to JIS B2220 02/11 02/12 Reference: Option Codes for Flange...

01/01 LWN 487.71-E Series 810 and 820 Overview LESER Pilot Operated Safety Valve (POSV) LESER Pilot Operated Safety Valves (POSVs) are designed according to the API 526 standard. The full range of sizes from 1" x 2" up to 8" x 10" (DN 25 – DN 200) with all orifices from D – T is available for pressure ratings up to pressure class 600 x 150. Beyond API 526, LESER offers so-called Extra Orifices (also known als Full Port or Full Bore nozzles, see page 01/09). The Extra Orifices provide maximum capacity in relation to valve size. In addition, LESER POSVs come in two different functional...

Product Description Series 810 and 820 Specifications and Approvals The LESER Pilot Operated Safety Valve (POSV) comprises the POSV main valve and a pilot valve based on either the Pop Action (Series 810) or the Modulate Action (Series 820) designs. The table below shows their common and their specific features. Specification at a glance Product Description 1) The possible flange pressure ratings depend on the size of the valve. Refer to page 02/11 to verify the correct option codes and availability of DIN EN and JIS flange ratings. LESER Pilot Operated Safety Valve (Main Valve and Pilot...

01/03 LWN 487.71-E Product Description Good Reasons for the LESER Pilot Operated Safety Valve Pilot operated safety valves have been a proven technology for many decades especially in ASME oriented regions. However, some of the older designs show potential for improvement in areas like external tubing, capacity and delivery times. Based on customer feed back and extended research and using Computational Fluid Dynamics (CFD), Rapid Prototyping and one of the most modern factories for safety valves, LESER has developed the latest POSV on the market. The new LESER POSV offers unique benefits...

LWN 487.71-E 01/04 Product Description Feature Benefit for user Benefit for assembler / maintenance High capacity / small size EXTRA ORIFICE Higher capacity for same valve size with Extra Orifice types. For details see page 01/09 Smaller valve sizes possible Small footprint in system -20% Others LESER POSV 20% less space requirement than typical competitive designs Space-saving system designs possible Small footprint in system Modular system Pop Action and Modulate Action pilot valves can be exchanged without tubing modification Easy later upgrade Less spare parts stock required. Easy...

Applications – Functional Areas Across applications, there are four main functional requirements covered by the LESER Pilot Operated Safety Valve (POSV). High Back Pressure Applications • LESER POSVs can be operated in applications with a back pressure ratio (i.e. a ratio of back pressure / set pressure) of up to 70%. Spring loaded safety valves can be typically used up to 50% of back pressure. • The absolute maximum back pressure is determined by the pressure class of the main valve outlet. Typically, LESER POSVs can be used for much higher back pressures than spring loaded safety valves....

Product Description LWN 487.71-E 01/06 Applications – Examples Compressors in Gas Main Systems Pressure relief devices in these applications must allow for high operating pressures in relation to set pressure, which are required for efficient gas transport. Additionally, compressor vibrations put through requirements on the tightness of the safety valve. LESER Series 810 and 820 POSVs offer an ideal solution for these conditions because: • they enable highest possible operating pressure to set pressure ratios facilitating maximum energy density of transport medium • they are not susceptible...

Product Description 01/07 LWN 487.71-E Sour Gas Applications (NACE) LESER Pilot Operated Safety Valves (POSVs) are available for sour gas (H2S) service. Regulatory Requirements The material requirements for hydrogen sulfide (H2S) service (sour gas service) are specified in the NACE standards, MR0175/ISO 15156 (Upstream processes), and MR0103 (Downstream processes). Since the body of the pilot valve is manufactured from stainless steel, only the spring in the pilot valve of the Series 810 Pop Action POSV and the dome spring in the main valve need to be replaced for compliance with these NACE...