Feb
Trim Numbers of Valves
For API valves, the trim is normally referred to the valve's internal parts that in contact with the fluid. According to API 600 and API 602, the trim is comprised of the following generally: a) stem; b) body seating surface; c) gate seating surface; d) bushing, or a deposited weld, for the backseat and stem hole guide; e) small internal parts that normally contact the service fluid, excluding the pin that is used to make a stem-to-gate connection (this pin shall be made of an austenitic stainless...