Tightly closed, on (1) to eliminate the stem of the Industrial Valves core barrel length increase, with the valve core and valve rod sleeve stem valve stroke. Device of losing effectiveness analysis showed that the effect is not as one-way high load the boot, but a cyclic load ( Such as oscillation) Phenomenon. (2) eliminate the adjustment screws, no longer after adjusting screw to adjust the valve stroke, to prevent the material is not the same as actuating electrode potential difference caused by the electrochemical corrosion. Q: guiding type electromagnetic valve common failure analysis and solution answer: in the electromagnetic pilot Industrial Valves without electricity things electric induction head, No output force electric induction head) , the effect of spring energy utility on the valve stem, valve stem pressure in the valve core seat and keep tightly closed. The metallographic analysis shows that there are superficial turnbuckle surface layer of the department of the remnants of the deformation of rheology, show that the turnbuckle part there is a big stress effect. When electric induction head initiation improve electricity power, overcome the spring force, the valve stem, valve core is out of the seat, media system emissions. Analysis confirmed that the valve opens when the valve core components such as initiation slight oscillation along the axial and circumferential relatively slight rotation, led to the pin and the valve core pin hole and the partial abrasion of valve stem outside appearance. Peeling of the chip and the substrate stripping sprouted a natural abrasive wear particles and appearance, abrasion and corrosion and so on at the same time, caused the turnbuckle lose effectiveness. Because turnbuckle petition site there is a certain gap, the contact stress and actuating oscillation under the load utility, direct contact with the metal appearance and relative movement, the relatively low hardness of the screw turnbuckle appearance initiation flake ( Energy spectrum analyze the final results show that the wear appearance of the metal to move) 。 3, the pin has a superficial abrasion and Marine valve groove on both ends, are visible surface spalling and shorter scratches microscopic special properties. stroke then passes through the valve core barrel length to debug, at the beginning of the pilot valve assembly for a period of time, after processing the valve core, more tightly closed end to restrict travel and stem stroke is negative deviation pilot valve, the valve core and valve seat tightly closed after grinding, the trip is deviation, so even if the valve core and valve seat tightly closed after repeated grinding surface can also guarantee the guide valve trip within the allowed error range. Stem extension, the top round head, still sees fit and use Inconel material, and close to the valve core material. Again by the present actual operation three months after the crash, check check, pilot valve condition is satisfied, no grinding crack was found valve core device, confirmed has removed the electromagnetic pilot Industrial Valves can not open the lack of a long period of time. For adjusting screw top of the bottom, there is a difference because the valve core and the adjusting screw electrode potential, initiation of electrochemical corrosion caused by valve core actuating appearance not delicate and contact strength decreased, thus causing adjusting screw top of the bottom and the valve core initiation adhesive abrasion ( Energy spectrum analysis can also be seen in abrasion on the initiation of metal moving) , as the leaked actuating the axial vibration of load and axial rotation load utility, soft screws at the top will be as the adhesive wear constantly pacified, finally caused the screw contact face losing effectiveness. For debugging turnbuckle parts of the screw, macro analysis and micro analysis showed that the area is mainly for contact fatigue actuating lose effectiveness. Common failure 1 guiding type solenoid valve, valve core abrasion upper pin hole, pin hole inside have relatively superficial be ground pressure of formation of the grooves, the microstructure is with abrasive dust particle and the characteristics of shorter scratch marks, edge grinding crack for extruding rolling flat metal chip morphology. Because the valve core components made improvements. Guiding type solenoid valve to improve treatment method in order to eliminate the valve core components of the oscillation problem, the way to work it is to the pilot valve in an open state, eliminate the free activity of valve core. (3) the pin diameter by & amp; φ; Increased to 3 mm & amp; φ; 5 mm, increased strength, so that the valve is in open condition would transmit the force of the stem to the valve core, the valve core on tightly closed pressure on the valve stem sleeve, avoid open valve valve core in steam flow oscillation conditions happen. Contact with the adjusting screw at the bottom of the valve core lumen, visible with superficial abrasion remnants, form a circular depressions on middle position, the microstructure of visible such as scaling and corrosion pore microscopic special properties. After the modification of the valve core components, bench on hot attempt to give a new structure of the pilot valve switch discharge try 500 times. Try to complete, the valve core components to understand the physical examination to check, and unconscious of oscillation caused by grinding crack. Hardness testing the final results show, the hardness of adjusting screw is about 280 hv, valve core hardness is about 440 hv, valve stem is about 500 hv hardness, pin hardness is about 550 hv. Guiding type solenoid valve comprised analysis through testing, valve core, valve stem, regulating the chemical composition of screws and pins materials are exactly the same with the preset technology requirements. 。 2, the valve stem, cylindrical appearance only a partial abrasion, local peeling phenomenon exists, in parts of the range was parallel to the axial basic groove characteristic symbol, can feel the valve core and valve stem to relative motion between weeks. Adjusting screws turnbuckle, pitting corrosion and corrosion, with pilot valve opening for a long period of time, after the electric induction maintain charged initiation magnetic head, actuating adjustment screws and stem material there is a difference between electrode potential and making adjustment screw turnbuckle accelerated electrochemical corrosion between the stem and utility turnbuckle lose effectiveness.
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