46 of valve 24 from being reduced as a result of varying supply pressures of the fire suppressant and or operation of alarm test valve assembly 66 in particular as fire protection system 20 is being put into an operating condition prime line check valve assembly 80 lets the fire suppressant go past seat seal 80 a as the pressure overcomes the force of the biasing spring 80 d once the prime pressure in prime line check valve assembly 80 reaches its set pressure spring 80 d causes seat seal 80 a to close and as a result retain the pressure in prime line check valve passage 78 by retaining the pressure in prime line check valve passage 78 prime line check valve assembly 80 protects the pressure in priming chamber 46 of valve 24 from being subjected to varying pressures as a result of potentially varying supply pressure of the fire suppressant additionally this also protects priming chamber 46 from being subjected to varying pressures as a result of operation of alarm test valve assembly 66 drain check valve assembly 126 is configured to allow the pressure in first and second alarm passages 136 138 to be drained through porv passage 106 while not causing the operation.