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      Zhengzhou Butterfly Valve Factory Co., Ltd.

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      Butterfly valve is often treatment and Prevention

      Release time:2012-11-2 15:07:42 Source:Zhengzhou Butterfly Valve Factory Co., Ltd. Browsing times:get_hits(177,1,0,"show_i_hits")

      Butterfly valve failure treatment and Prevention
      One, stuffing box leakage
      This is run, run, drip, leak the main aspects, in factories often see.
      Produce stuffing leakage of some of the following reasons:
      ①filler and working medium erosion, temperature, pressure suit
      The filling method differences error, especially the entire root fillings in the circling, and leakage easily occurs
      The stem surface finish machining accuracy or not, or ellipse, or nick
      The stem has pitting, or due to lack of protection and rusty surface
      The valve rod bending
      The filler used for too long, has been aging
      ⑦manipulation too hard
      Remove packing leakage method:
      ① the accurate selection of filling
      ②according to conduct accurate filling
      ③the machining of unqualified, to repair or replacement, surface smoothness minimum connected 5, more important, to achieve operating more than 8, and no other defects
      ④to take protective measures to prevent corrosion, corrosion, has to be replaced
      The valve stem to bend straightening or update
      ; the packing use after a certain time, to replace
      The manipulation of attention to smooth, slow open and shut, preventing the temperature changes or medium impact
      In two, the butterfly valve seal leakage
      Usually the stuffing box called the leakage leakage, the closure is called internal leakage. Seal leakage, the valve inside, not easy to find
      Seal leakage, can be divided into two categories: one is the sealing surface leakage, another kind is the root of leakage of sealing ring
      The reasons caused leakage:
      ①sealing surface grinding is not good
      The sealing ring and the valve seat, valve flap with very strict
      The valve is connected with the valve rod is not firm
      The valve rod bending and torsion, the upper and the lower closure error of differences
      The closed too soon, the sealing surface and the contact is not good or been damaged
      The improper material selection, unable to withstand the erosion of media
      ⑦will stop valve, gate valve used as an adjusting valve. The sealing surface of high speed moving dielectric withstand erosion
      In some media, in the valve closed after cooling gradually, so that the sealing surface with slots, also will produce the erosion phenomenon
      Have certain and valve seat sealing surface, the valve flap is connected by screws, easy to produce the oxygen concentration cell corrosion, loose
      Method for welding slag, rust, dust and other impurities embedded, or production system of mechanical parts falling block valve, so that the valve is not closed.
      Butterfly valve prevention approach:
      ①necessary before serious pressure leak testing, found that leakage of sealing surface or seal root leakage, to handle before use
      ②to check valve components are in good condition, cannot use stem bending or valve plate and valve stem connection can not be twisted valve
      The valve shut to make steady effort, do not make hard, such as the discovery of sealing surface contact between the good or the obstacle, should immediately open a little, let the impurity outflow, and then carefully secured
      The selection of valve, not only to consider the body 's resistance to erosion, but also to consider the closure of erosion resistance
      And according to the structure characteristics of valves, accurate use, need to adjust the flow components should adopt regulating valve
      ⑥for closing valve after cooling medium and a larger temperature difference, in the cooling after the valve closed tightly.
      The valve seat, valve flap and the sealing ring are connected by threads, can use teflon tape is threaded between the filler, so that it is not a free
      ⑧may fall into the impurities of the valve, should be in the valve with filter
      Three, valve stem lift failure
      Valve lift failure reasons:
      ①manipulation so that the threaded injury too
      The lack of lubricants or lubricant failures
      The valve rod bending and torsion
      The surface finish is not enough
      The tolerance to bite, too tight
      The valve stem nut tilt
      The improper material selection, such as stem and valve stem nut for uniform material, easily bite
      ⑧thread be medium erosion (referring to rod valve or valve stem nut in the lower part of the valve )
      Lack of protection of open valve, threaded stem covered with dust or sand, and the corrosion by rain
      Prevention method:
      ①careful manipulation, closed when not make hard, open not open enough to the top dead center, the hand wheel reversing one or two ring, the upper sealing screw thread, so as to avoid the media drives the valve rod to impact
      ②often check the lubrication condition, maintain the normal lubrication
      ③do not use a long lever to open and close the valve, the habit of using short lever workers to strictly control the force measured, in order to prevent twisting stem ( a handwheel and stem directly connected valve )
      The progress of processing or repair quality, meet the requirements of specification
      The material to be resistant to erosion, adapt the working temperature and other working conditions
      The valve stem nut do not use the same material with the valve stem
      ⑦the plastic valve stem nut, to checking intensity, not only consider the good corrosion resistance and low friction coefficient, we must consider the problem of insufficient strength strength, do not use
      ⑧open valve with valve rod protecting jacket; have a normally open valve, schedule rolling wheel, so as not to stem rust

      Copyright © the 2012 Copyright Zhengzhou Butterfly Valve Factory Co., Ltd. Henan ICP 10017893 No. ofThe contacts:Mr Yang 18638587506Tel :0371 -68921556Fax :0371-68,924,295
      Address: Zhengzhou Shangjie eastern outskirts paragraph Postal Code: 450041 網站服務:鄭州網站建設|鄭州做網站|滎陽做網站新仲達網絡

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