> Enclosed discharge valve with threaded connections

> Larger outlets, to enable larger flow

Product Description

The LGS HI-FLOW safety relief valve is a game-changer in pressure relief technology. Featuring a state-of-the-art design with a dual-guided spindle and the innovative Seetru Rock-Seal™ technology, this valve guarantees repeatable high-performance sealing even under demanding conditions.

The LGS HI-FLOW boasts larger outlet sizes when compared to the standard LGS valve range – enabling it to handle significantly higher flow rates

The HI-FLOW maintains the LGS range’s signature modular design and compact footprint. This, combined with Seetru’s proprietary technology, translates to a cost-effective solution for your pressure relief needs.

The single-trim design ensures versatility across various applications. Its components are compatible with liquids, gases, and steam, allowing you to use the same valve in different situations without modifications.


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Example Applications:
  • Air/Gas systems
  • Natural Gas
  • Pressure vessels
  • Medical gases
  • Technical Gases
  • CO2 refrigeration
  • Ammonia refrigeration (Stainless steel)
  • Cryogenic applications
  • Liquefied gases



View or Download Datasheet


Technical Information

Technical Information for the LGS Safety Relief Valve Range

  • Min. Pressure
    0.2 bar (depending on seal and duty)
  • Max. Pressure
    24 bar (depending on seal and duty)
  • Temperature Range
    -60°C to +200°C (with PTFE seals (EPDM -45°C to +140°C)
  • Inlet Connection(s)
    DN15 to DN50 (½” BSP to 2” BSP)
  • Flow Rate
    See Datasheet
  • Materials
  • Seal Materials
    P.T.F.E, / EPDM
  • Test Certification
    Included - supplied Free of charge


  • Designed in accordance with BS EN ISO-4126-1 & -7
  • PED 2014/68/EU (CE)
  • PE(S)R UK SI 2016 No. 1105 (UKCA)
  • EAC
  • WRAS
  • KUKReg 4


Find Your Industry Solution

Safety Relief Valves for Liquid Applications
Safety Relief Valves for Compressed Air & Gas
Safety Relief Valves and Pressure-Reducing Valves for Steam Applications


Learn about Pressure Control

Delving into the realm of pressure control can be daunting, especially when terms like “safety valve,” “pressure relief valve,” and “safety relief valve” start dancing around. While they seem interchangeable, each plays a distinct role in keeping things safe and smooth. Let’s untangle this valve vocabulary!

Visit our Terminology webpage and gain an understanding of ‘Safety Valves’, ‘ Safety Relief Valves’, and ‘Pressure Relief Valves’



View or Download the Type LGS HI-FLOW Datasheet

Full Technical Information - Including Flow Rates

View or Download the Type LGS HI-FLOW Datasheet

Seetru offers a wide range of downloadable datasheets for our products, including safety relief valves, liquid-level gauges, and sight glasses.  These datasheets provide detailed information on the technical specifications, features, and applications of Seetru products.  They are an essential resource for engineers, designers, and other professionals who need to select the right Seetru products for their specific needs.


Find your PDF Download for the LGS HI-FLOW Range below…
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Visit Our Downloads Page View the Type LGS HI-FLOW Datasheet