Control valve routine maintenance and fault research
Modern industrial production process, the degree of automation is getting higher and higher, while the control valve as an automatic control system in the executive body, in the stable production, optimal control and so has an important role. With the long period of equipment, high load operation, the control valve jamming, corrosion, vibration, leakage and other issues continue to occur, resulting in shortened service life of the valve, reduce the reliability of the work, seriously affecting the safe and stable operation of the production plant. Therefore, it is very important to find and solve the fault timely and accurately in routine maintenance. Some common faults and their solutions are listed.
First, adjust the valve leakage
01
Valve leakage, stem length discomfort.
Valve leakage reasons: air valve, the valve stem is too long and the valve stem is too short, the valve stem up (or down) the distance is not enough, resulting in a gap between the valve core and valve seat, can not be fully exposed, leading to the closure Not strict and internal leakage.
Solution: Should shorten (or extend) the valve stem so that the length of the stem so that it no longer internal leakage.
02
Packing leaked. The reasons for the leakage of packing: (1) packing stuffing letter and stem close contact, but this contact is not very uniform, some parts of loose contact, some parts of the contact tight, and even some parts of the contact is not. (2) there is a relative movement between the stem and packing, with the impact of high temperature and high pressure and permeability of the media, resulting in leakage of packing. (3) filler gradually reduce the contact pressure, the filler itself and other reasons, the media will leak out from the gap. To solve the problem: (1) In order to facilitate the filling stuffing, chamfering at the top of the stuffing box, placed at the bottom of the stuff