Relief valve and check valve protection facilities
1. Safety valve protection facilities
Under normal circumstances, the partition valve, relief valve is not set before and after only in individual cases, the relief valve set partition valve before and after. Contains solid impurities, such as medium affect the relief valve cannot be locked after takeoff, in front of the relief valve to install a gate with a seal. Gate valves should be in full open position, gate valve between the relief valve and furnish a size 3/4 "check valve of the atmosphere.
For relief valve discharge of wax, phenol and other media for solid state at room temperature, or decompression evaporation and make the light liquid hydrocarbon such as medium temperature is below zero, the relief valve to steam heating.
For the safety valve of corrosive medium, depending on the corrosion performance considerations in the valve inlet valve and corrosion resistance of the explosion-proof membrane.
Gas safety valve according to the general size set a bypass valve, as the manual vent.
2. Check the protective facilities
In order to prevent reversal check valve leakage or failure after medium, the check valve should be set up before and after one or two cut-off valve. If set two cut-off valve, can facilitate maintenance check valve is removed