ST-280 PRESSURE UNLOADER by SUTTNER (3710)Used for adjusting the maximum working pressure and safe guarding the high pressure water pipes this Suttner ST 280 Unloader Valve is ideal for steam combination applications. Low pressure limit eliminates need for additional metering devices. This is the only tamper resistant operator adjustable valve in the industry which allows limit setting on both maximum pressure and minimum pressure. Its straight flow through design minimizes pressure loss