The DRV4 is a cast steel direct acting bellows sealed pressure reducing valve. The standard version has an EPDM diaphragm and is suitable for steam, water and air applications. The DRV4 is available with a Nitrile rubber diaphragm (suffix 'N ') for oil applications. A Nitrile rubber soft seated version (suffix ' G ', limited to 90 ° C) is also available for applications that require tight shut-off. It is recommended that for these applications, a maximum pressure turndown ratio of 10:1 is observed.