Kromschroeder GFK100F60-6 (81944103) gas filter

This gas filter from Kromschroder is a replacement part for the GFK range. It is installed in the gas supply line upstream of the gas valve and pressure regulator. Its purpose is to remove solid particles—pipe scale, dirt, welding debris—from the fuel gas before it reaches sensitive components such as the solenoid valve seats, servo regulators, and burner nozzles. A clogged or missing filter can cause erratic gas pressure, valve leakage, or burner ignition failure. When selecting a gas filter of this type, the main parameters are the connection size and thread type (in this catalogue typically Rp female or flanged), the filter mesh size (coarse for natural gas, finer for LPG or biogas), and the maximum operating pressure of the system. The housing material (usually aluminium or cast iron) and the seal material must be compatible with the gas composition—standard for natural gas, special seals for corrosive or wet gases. When replacing a filter, always check the flow direction arrow cast into the body. The gasket or O-ring between the bowl and head should be renewed if it shows signs of compression set. Some filters have a replaceable element, others are cleaned and reused; consult the manufacturer's datasheet for the correct service interval. A filter that is undersized or blocked will restrict flow and cause a pressure drop that may prevent the gas pressure switch from closing, leading to burner lockout.