A COMBINATION STRAINER AND BLOCKING VALVE FOR LIQUID METAL SYSTEMS

摘要

A 3-in. pipe size combination valve and strainer device performed satis¬factorily when tested in a sodium system. This device provided a means of re¬moving an in-line strainer element from the system without draining the sodium and alternately served as a plug type blocking valve. Tests were conducted over a temperature range of 500 to 950°F and system pressures of 0, 5, and 10 psi at sodium oxide contents of 50 to 400 ppm. The strainer element was isolated from the system by freezing the sodium around the valve plug. The time re¬quired to freeze the sodium was found to be primarily a function of system temperature;a typical value being 75 minutes for a system temperature of 800°F.