A Prabha Pressure Relief Valve (PRV) consists ofUpper part i.e. Safety Relief Valve (SRV) and the Bottom Part i.e. Check Valve (Isolation Valve). When used in conjunction with the check valve (Isolation valve) permits the exchange of the relief valve(Upper part) without the necessity of evacuating the container. These external valves (i.e. PRV) are designed for use as a primary relief valve on above-ground domestic and industrial bulk LPG Containers. https://prabhaelectronics.co.in