Attention must guarantee processing quality in the machining process, such as tightly closed surface appear crack, trachoma lack must be turning down after the new processing. core seat in the assembly process is not absolutely right or joint surface phenomenon of pervious to light, or is the valve core seat tightly closed surface too wide disadvantages in tightly closed. Another thing is tightly closed surface damaged condition. Reliable safety valve in the office or not is directly related to facilities and personal safety of life, so be sure to give respect. Lead to tightly closed surface damage mainly comprised of the following: one is tightly closed surface material is bad. Lead to tightly closed for impurity mat live deprived of, when the valve assembly seriously organize joint surface to prevent impurities fall into completely. 2. 1, the valve leakage? Under pressure from normal office facilities, disc and seat tightly closed surface occurred more than allow degree of leakage, the relief valve leak will pay actuating medium loss. Common causes of valve leakage comprised mainly has the following three things: a situation is, dirt on tightly closed surface impurities, will tightly closed surface mat, cause there are gaps between the valve core and valve seat, so the valve leakage. 2 it is to the body on the surface of the joint tooth tightly closed pad is not qualified. Additional, media constantly leaking will make hard tightly closed material damage, however, the commonly used safety valve tightly closed surface is metal to metal material, is trying to do is bright and clean level off, but in the medium with pressure what condition do not leak is also very difficult. Because of this, for office medium is steam safety valve, under prescribed pressure value, if in the outlet of the eyes can't see, also don't recognize have leakage, feel is standard strict sealing performance. Eliminate this kind of failure is to wipe out a full drop to tightly closed, dirt and impurities on the surface of the ordinary in the boiler to start the furnace volume repairing, first try run exit lead, if found leakage after stopping furnace of collapse, check check repair, if leakage point when trying to find the furnace run after mound exits, estimation is caused by this situation, can be in running tuo cooling after 20 minutes after rudder, the tightly closed surface erosion. New processing of valve core seat must accord with drawings requirements. In 3 ~ 9 furnace is the main exit, for example, because of the age-old check repair, the taiping gate valve core and valve seat tightly closed face widespread has developed very low, the tightly closed surface hardness is also greatly reduced, resulting in tightly closed performance decline, the best way to eliminate this kind of phenomenon is the original tightly closed surface turning, and then according to the drawing requirements from the new welding processing, increase hardness tightly closed surface appearance. Q: common failure analysis of boiler safety valve valve a: analyze the boiler safety valve valve leakage and body joint leakage, impulse safety valve action after the relief valve is not action, impulse safety valve seat back left in the relief valve delay back to the time is too long and low back pressure of safety valve, frequency and flutter are comprised of common failures, and solution to fault comprised. When check repair the good quality of spare parts, right and use standard tooth tightly closed mat can prevent the occurrence of this phenomenon. 2, the relief valve comprised the common breakdown analysis and solution. So far using YST103 general steel electrode welding processing of valve core tightly closed surface effect is good. Offset method is to debug screw tight force, when the screw must be tight at the diagonal form, it is best to tight while surveying space, everywhere to screw tight tight deadline, and make the joint gap is exactly the same everywhere. 。 Second, check repair low-grade, the valve core seat grinding can not meet the quality standards, eliminate the fault is according to the damage degree of thought and the use of grinding or turning right after grinding to repair tightly closed surface. 吗? Lead to another comprised of relief Industrial Valves leakage because of improper assembly or related parts size is not suitable. Three is the simplest inside the body joint degrees too bad or be hard impurities cushion tightly closed out of validity. For example, the tooth profile was tightly closed pad radial small trench, parallelism is poor, such as tooth tip or a slope lack can all result in a tightly closed lose effectiveness. About the simplest because the body on the surface of the joint surface degrees too bad but the boot body joint leakage, alleviation of valve solutions for Marine valve body weight could be a new lapping joint face until meets quality standards. 2. 2, the valve leakage of joint face? Refers to the joint between the upper and lower body surface leakage phenomenon, is mainly comprised of the leakage has the following aspects: not enough is the screw inside the joint force or partial tight, lead to joint face tightly closed very bad. 1, striped tube safety valve is a kind of very matter try our best to take care of with valve, widely used in all kinds of pressure vessels and piping systems, when the pressure in the system pressure than specified value, it can open semi-automatic, the medium of excess emissions into the atmosphere, in order to ensure the safe operation of the pressure vessel and pipeline system, avoid the happening of the accident, and when the system pressure back to the office or slightly below the office pressure and semi-automatic closure. So that the body joint leakage. Alleviation is seizing the valve core surrounded by appropriate void volume and the average sex, guarantee top valve core hole with tight sealing faces are degrees, seizing each gap is not allowed to lift the valve core. According to the drawing requirements appropriate reduce successful implementation work tightly closed tightly closed surface width.
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