The service life of valve fittings depends primarily on the type of fitting, material, operating conditions, and maintenance. Different fittings have significantly different service lives, generally ranging from 1 to 5 years. Specific categories are as follows:
Sealing Fittings: These are consumable parts with the shortest service life. Under normal operating conditions (normal temperature, normal pressure, common media), their service life is 1-2 years. In harsh conditions (high temperature, high pressure, corrosive media, high wear), the service life can be shortened to 3-6 months. Core components include sealing rings, gaskets, and packing. These fittings are in constant contact with the media and are prone to aging, wear, and corrosion, requiring regular replacement to prevent leaks.
Operating Fittings: These have a moderate service life, ranging from 2 to 5 years under normal operating conditions. This includes handwheels, handles, valve stems, and valve stem nuts. Metal operating fittings (stainless steel, alloy steel) have a longer service life (3-5 years), while plastic and cast iron handwheels and handles have a shorter service life (2-3 years). Proper maintenance, such as regular application of lubricant and cleaning, can extend their service life. High vibration or frequent operation will shorten their service life.
Connection fittings: These have a relatively long service life, typically 3-5 years under normal operating conditions. This includes flanges, bolts, nuts, and connecting pipes. Metal fittings (carbon steel, stainless steel, alloy steel) are high in hardness and wear-resistant. If there is no rust, deformation, or breakage, they can last 3-5 years. However, in humid or corrosive conditions, their service life will be shortened to 2-3 years, requiring regular checks for rust and timely replacement.
