The the stem down failure reasons: â' The operation excessive thread damage; â'¡ lack of lubrication or lubricant failure; â'¢ stem bending and torsion; â'£ surface finish is not enough; â'¤ fit tolerances are not allowed to bite too tight; â'¥ stem nut tilt; improper â'¦ material selection, such as stem and stem nut is made of the same material, easy to bite; the â'§ thread is corrosive medium (dark bar valve stem nut in the lower part of the valve); â'¨ lack of protection of open-air valve stem thread covered with dust and sand or rain frost and snow are corroded.
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Prevention methods:
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(1) careful operation, when closed, do not make Meng Jin, open to the top dead center, do not open enough will handwheel rewind twice, so that the thread on the side of the adhesion, to avoid media to promote stem upward impact; (2) regular checks of lubrication, maintaining normal lubrication; â'¢ Do not use a long lever opening and closing valves, accustomed to using a short lever workers forced to strictly control the sense of proportion, to prevent bending and stem (hand wheel and stem directly connected to the valve); â'£ improve processing or repair quality, meet regulatory requirements; â'¤ materials to corrosion, to adapt to the working temperature and other working conditions; the â'¥ stem nuts not to use the same material with the stem; â'¦ plastic for stem nut to checking the strength to not only consider good corrosion resistance and low coefficient of friction, must also consider the intensity of the problem, the strength is not enough, do not use; â'§ open-ai r valve stem protection sleeve to add; the â'¨ normally open valve, want to turn the hand wheel on a regular basis, so as not to stem rust live.hydraulic fittings suppliers
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