The MEGR-1289H Series relief valve is a throttling relief valve used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during emergency operation. They are installed between large second stage regulators and the burner to provide high capacity relief. They are ideal for low pressure settings due to the sensitivity provided by the large diaphragm area. Suitable as high pressure capacity relief device when installed between a first and second stage regulator.