Abstract: A modular gas valve arrangement including a housing that has a valve chamber having a gas inlet and a gas outlet and a valve mechanism disposed in the chamber between the inlet and the outlet to control the flow of gas. An interchangeable valve control module is mounted to the housing and has a valve actuator that moves the valve mechanism to control the position of the valve mechanism to thereby control the flow of gas. A diaphragm seal is disposed between the control module and the valve mechanism to seal the valve chamber from the control module. A diaphragm seal is connected to the valve mechanism and acts to retract the valve mechanism under pressure of gas within the valve chamber.

Abstract: A system for controlling the flow and combustion of natural gas and/or liquid propane in a ventless fireplace. The system utilizes an ODS pilot in combination with a burner, an electronic control module, a gas control valve, an igniter, and a flame rectification sensor. When the pilot is lit, an ionized flame is provided and the current of the flame rectification sensor is rectified, providing a signal to the electronic control module to maintain the delivery of gas to the pilot and main burner via the gas control valve. When the oxygen level within the fireplace falls below a predetermined level, the flame at the pilot becomes unstable and this prevents the rectification of current at the flame rectification sensor, signaling the electronic control module to cease the flow of gas the burner and pilot via the gas control valve.