The IMI Thompson Valves Screwdown Non Return Valve provides compact, dual-function flow control in demanding naval systems. Designed to automatically prevent reverse flow, it also features a manual override for shut-off when needed. Shock-qualified for extreme conditions and built with top-loaded, inline-serviceable components, it supports long-term operation in high-pressure, high-integrity systems. Available in nickel aluminium bronze and stainless steel, it suits a wide range of fluids including seawater, fuel, hydraulic oil, and high-pressure air. With pressures up to PN 320 and temperature tolerance from -50°C to 150°C, it’s ideal for submarines and surface ships alike.

Key features

Automatic non-return with manual shut-off

Shock-qualified for naval service

Top-loaded inline maintenance

Configurable seats and connections

Temp range: -50°C to 150°C

Pressure: up to PN 320

Sizes: DN 6–100

Materials: NAB or stainless steel