LGS Safety Relief Valves

Liquid, Gas, and Steam Applications

WRAS Approved

Both the PTFE and the EPDM sealed LGS valves have WRAS approval

Same-Day Despatch

A wide range of safety valves in stock for quick delivery

Multi Purpose Safety Relief Valves

The Seetru LGS® Multi-Purpose Safety Relief Valve range represents a state-of-the-art design with dual guided spindle as well as the Seetru Rock-Seal™ seal technology for repeatable high-performance sealing. It is a high-quality valve of modular design and construction incorporating the Seetru proprietary compact design technology – providing a highly cost-effective range of valve solutions.  LGS® valves have a robust and reliable construction designed for the widest range of industrial applications.


LGS & LGS HIGH-FLOW Safety Relief Valves

Quick Links:  LGS / LGS Hi-Flow Safety Relief Valves

  • Bronze body with dezincification-resistant brass wetted parts; stainless steel spring, spindle, and seal retainer
  • Size range (LGS):  DN15 to DN65 (½” BSP to 2½ ” BSP)
  • Size range (LGS HI-FLOW):  DN15 to DN50 (½” BSP to 2” BSP)
  • Pressure Range: 0.2 to 24 bar g. (steam up to 14 bar g. with PTFE seals, contact Seetru for information on other seals)
  • Temperature Range: -60°C to +200°C (with PTFE seals (EPDM -45°C to +140°C)
  • Degrease for oxygen available on request
  • PTFE or EPDM sealing as standard (other seal materials available upon request)
  • Easy-to-fit spares kit
  • Self-draining design
  • Adaptors available to give male connections
  • Open Lever or Sealed Cap
  • Designed in accordance with the requirements of BS EN ISO 4126 Part 1 and CE marked as a Category IV Safety Accessory
  • WRAS approved
  • Available for quick delivery using our Same Day Despatch Service
  • Supplied with Declaration of conformity, EN 10204 3.1 material certification available on request
  • Test certificate supplied free of charge


  • Hot water, including boilers (vented and unvented)
  • Steam boilers and steam plants
  • Pump and thermal relief
  • Bypass relief
  • Process liquids and gases
  • Pressure vessels and lines
  • Heating and cooling systems
  • Heat exchangers and industrial cooling systems
  • Refrigeration systems
  • Pressure booster systems


  • Solar power systems
  • District heating systems
  • Water supply systems
  • Sewage systems
  • Pressure control and regulation
  • Chemical plants
  • District heating systems
  • Ship building and marine applications

Find your relevant download

View or download useful information…

Your Download

View or Download the Full LGS Product Brochure

View or download full technical information, Including flow-rates

Seetru LGS and lGS HI-FLOW Safety Relief Valves

View or download the full LGS product brochure, this downloadable PDF contains Full technical information about our multi-purpose safety relief valves for liquid, gas, and steam applications.


Don’t forget! 

The LGS range is available for same-day despatch.

All of our valves are available from DN15 to DN65 (1/2″ to 2 1/2″ BSP female connections)
The pressure range is 0.2 to 24 bar (depending on seal and duty)

The LGS range is now UKCA-approved and marked.

Visit Downloads Page Purchase LGS from our Same-Day Despatch Range

Contact Information

Our sales engineers here at Seetru Limited have extensive knowledge and experience of safety valve selection and sizing. We recommend that you contact our team to discuss your requirements.