Control valve leakage caused by the failure

Internal leakage caused adjustable decreased, severe damage to the control system can not meet the process operation and control requirements. External leakage cause environmental pollution, so that the increased cost. Failure analysis as follows.
Due to cavitation and cavitation caused by leakage increases. Cavitation, flashing and cavitation caused by damage to the valve plug and seat control valve leakage increases when the performance of the gas or liquid dynamics noise increases. Troubleshooting method is to check the trim, replacement or grinding spool valve seat, the valve surfacing carbide, reduce the pressure drop across the control valve to eliminate noise sound source, the use of low-noise control valve.stainless steel hydraulic hose fittings
2 accused of fluid containing debris caused by the leakage increases. Driving stage is often due to the purging of the pipeline will not control valve removed regulate the operation of to cause debris into the control valve, or during operation, was charged with the accumulation of fluid entrained debris inside the valve body, the debris caused by valve the core and the valve seat sealing surface damage, so that the amount of leakage is increased. Troubleshooting is abrasive plug and seat, removed in the pipeline purge control valve, control valve installed upstream of the filter device, the control valve is installed at a higher position, and regularly charged with fluid containing particles, sewage.
Actuator and adjusting mechanism connected inappropriate. The troubleshooting methods reinstall a leakage test.
4 filler improper installation. Due to improper installation, packing, resulting in increased friction or stem deformation. Troubleshooting is to re-install the filler stem plastic deformation.
Flange improper installation. Resulting in uneven force caused by external leakage, troubleshooting method is to re-install the connecting flanges and gaskets, and uniform clamping force connecting flange.
Fluid flow on the spool and seat wear. Troubleshooting plug and seat grinding.
Filler caused by improper installation increased friction control valve off caused by lax external leakage increases. The Troubleshooting method is to reinstall fillers, to reduce friction.
8 the flow of the improper leakage increases. The flow of inappropriate choice to make the unbalanced force increases, so that leakage increases. The Troubleshooting method is check design drawings, reinstall it.sae hydraulic fittings