HIGH PRESSURE STEAM VALVE

LEAKS can exist anywhere in a system. may be escaping through external or internal leaks in fittings, valves or controls, from oversized traps, or traps that are blowing, leaking or plugged with dirt. It is essential to know how each trap or valve works under specific conditions in order to be able to diagnose a problem correctly. To determine leakage or blockage, touch the ultrasonic instrument upstream of the valve or trap and reduce the sensitivity of the, detector until the meter reads about 50. When check valves are placed closer than three feet downstream of blast action traps (such as Inverted bucket or thermodynamic types) flappers may loosen or even break free. Damaged check valves will usually become noisy. When control valves and the pressure relief valves are grossly oversized they are forced to work close to their seats. High velocity wet acts almost as sandpaper, cutting the seat when a mixture of and water is forced through the tiny crevice. In a system, oil pressure relief valves and water heater pressure relief valves that have opened by excess pressure may not reseat properly. Some with softer seats may be chattering or may suffer microscopic and water cuffing. The high pressure valve will detect the turbulent passage of or vapor as it moves through the leak site. Touch the instrument's stethoscope at the point on the valve closest to the orifice and then touch the downstream piping. Leaking and blowing valves are easily identified.