The regulating valve is maintained and maintained
Need to maintain and maintain after the normal running of regulating valve. Regulating valve, as a part of automatic control system, their maintain, should go on meanwhile with automatic instrument and other apparatuses.
The maintenance of the regulating valve is similar to maintenance of the general instrument, can be divided into passive maintenance, preventative maintenance and foresight maintenance. Passive maintenance is a maintenance method just safeguarded when apparatuses such as the regulating valve,etc. break down. Break down and just maintain because of the apparatus, often cause the production process to park, even present apparatus damage or casualties,etc. when being serious. Passive maintenance is the maintenance that a production process does not hope, preventative maintenance is according to the past operation experience, carry on a maintenance method safeguarded according to time. For example, commonly used schedule maintenance is the preventative maintenance, it makes the corresponding maintenance time table according to the running situation of different apparatuses, safeguard when the apparatus has not broken down yet. Because the trouble is safeguarded without happening, so, probability takes place to can reduce the trouble greatly. But this kind of maintenance method has not analyzed the actual conditions of this regulating valve used at present, often carry on disassembly and assembly and inspection to the regulating valve using certain time, have wasted time and resource. The maintenance of foresight proceeds from regulating valve data analysis used at present, predict the state of this regulating valve, thus make the regulating valve get maximum use.
First, daily maintenance work content of the regulating valve
The daily maintenance work content of the regulating valve is divided into two parts of touring checking and schedule maintenance, the touring content of checking up the work is as follows.
1,Find out the running situation of the regulating valve from craft attenbant on duty.
2,Look over the regulating valve and supply energy (the source of the gas, hydraulic oil or power) about attachment
3,Check the systematic running situation of hydraulic oil.
4,The ones that checked the regulating valve are each quiet and moving and sealing and clicking letting out.
5,Check the regulating valve and connect pipeline and piecing to become flexible or corrode.
6,Whether there is unusual sound and shake greatly to check the regulating valve, checks and supplies the situation.
7,Check whether the movements of the regulating valve are flexible, change while changing in control signal in time
8,Whether intercepting the core of the valve, valve seat has unusual vibration or noise.
9,It gets in touch and deals with in time to discover the problems.
10,Do the touring record that checked well, and file.
The fixed maintenance work content is as follows:
1,Carry on the cleaning to the outside of regulating valve regularly.
2,Adjust gland box and other sealed parts of regulating valve regularly, should change the sealed part if necessary, keep quiet, move and seal the sealing that is clicked.
3,Add the lubricating oil to the part needing to lubricate regularly.
4,Filter and carry on the blowdown and cleaning to the source of the gas or hydraulic pressure systematically regularly.
5,Check every connections of connecting the point regularly, corrode the situation, should change the attachment if necessary.
Two, fixed check-up of the regulating valve
The unit that the foresight maintenance work of the regulating valve has not launched yet, should check the regulating valve regularly. The fixed check-up work is the preventative maintenance work.
According to different craft production processes, there should be different check-up cycles in the fixed check-up of the regulating valve. Can combine the materials that manufacturers offered and confirm the fixed cycle for check-up of every regulating valve. Can usually go on while the production process of the craft is overhauled. When some regulating valves are applied to high pressure, lowering under high pressure or occasion with stronger corrosivity, test cycle should shortened.
The content of test is mainly a static function test of regulating valve, can increase the corresponding test project if necessary, such as test of the flow characteristic of the regulating valve,etc.. Fixed check-up needs to test apparatus and instrument relevantly, need the part changed, so, can usually trust manufacturers to finish.
Three, maintenance of the regulating valve
The regulating valve is maintained and divided into emergency maintenance, scheduled maintenance and foresight maintenance. Emergency maintenance is that the regulating valve breaks down, the maintenance when can’t meet the handling requirement of the craft. The scheduled maintenance usually includes ordinary maintenance and parks and overhauls the maintenance that is carried on with the craft at the same time. It is the maintenance of relevant regulating valve parts pointedly according to the analysis result of maintenance of foresight that foresight is maintained. Emergency maintenance is the maintenance after the regulating valve breaks down, it is the maintenance before a regulating valve breaks down that scheduled maintenance and foresight are maintained. Usually, the ordinary maintenance of the regulating valve is gone on by the instrument maintenance personal, go on from making a technical staff with overhauling the scheduled maintenance that is carried on at the same time.
One) Regulating valve check and maintain work, include following content at ordinary times:
1,Dispel the stress. Cause various stresses because of installing or making up improperly. For example, the high-temperature medium produces heat stress, it is urgent while installing. Firm strength causes stress,etc. unevenly. Imbalance of stress act on regulating valve, enable valve stem of regulating valve, lead one to deform, it is can’t correct and valve flat to in cause leak,it is increase,etc. not to it is bad whether to become or not. So, should carry on the maintenance which dispels the stress and work in ordinary maintenance.
2,Remove rust and filth. Whether connect and there are rusts, weld the dreg, filth etc. in the pipeline to often check the regulating valve, should remove in time after finding. Because the filth will cause the abrasion of valve core of the regulating valve and valve seat, influence the normal running of the regulating valve. Usually, can install in front of the regulating valve additionally and filter filters such as the network,etc., and washed regularly.
3,Check the regulating valve to support. The regulating valve supports to make every part of the regulating valve in the position free of gravity,etc.. It is it improper to if support and will can’t cause by valve stem and valve flat on regulating valve to in, become bad to make and increase, the sealing property drops. So, should check it is suitable that the regulating valve is supported.
4,Remove filth which supplies the energy such as source of the gas, hydraulic oil. The source of the gas, hydraulic source are the energy source that the regulating valve operates. The appearance is by will stop up and reduce expenditure hole and pipeline to compress the impurity included in air, hydraulic oiling, cause the trouble. So, check source of the gas, hydraulic oil regularly, it is very important to carry on blowdown to the filter regularly.
5,Inspection of the gear system. The gear system of the intersection of rival and rounds of organization, carrying out electronically device and liquid-operated carrying out device should check regularly, add lubricant, prevent gripping the card phenomenon and taking place. Should check and apply the brake and flexible work well with the limit location device.
6,The gland box is checked. Should check the abrasion situation of the packing and compress tightly strength, change the gland box regularly, guarantee packing can while getting up sealedly, reduce the intersection of shadow and mouth of frictional force its to. The gland box to having no oil to lubricate should not add the lubricating oil.
7,Inspection of the safe operation. Regulating valve and attachments relevant to using should last their running situations saves for example, whether the sealed lid is tightened, the running situation of the safe bar, the power supplies situation,etc., safe operation of can guarantee regulating valve and relevant attachmentsing.
8,Transport and keep. During transporting and keeping, it is fixed to employ the specialized support, prevent becoming flexible in the regulating valve; Install the relevant attachments on the regulating valve, for instance the positioner of the valve, handwheel organization,etc. should be firm, should prevent part of feedback pole,etc. connected with regulating valve is damaged by the external force; Every connection interface employs the plastic membrane envelope, prevent the other thing from invading; The intersection of connection and mouth of the regulating valve can be sealed with the blind board with the related flange, can also adopt the paper of stickness to seal, prevent the other thing from invading. Should install the firm wooden case additionally while transporting, and adopt and defend the influence in environmental conditions of abominable transportation such as the sand blown by the wind, rainwater and dust,etc.. The environmental condition transported and kept should meet the catalogue requirement.
Two) The main contents of regulating valve and attachment ordinary maintenance are as follows:
1,Change of the pneumatic executive body diaphragm. The diaphragm of the pneumatic membrane executive body is stretched out and drawn back in the course of running, so, it is easy and tired to damage. Should adopt with the rubbery diaphragm of the specification while changing, should force diaphragm evenly when being firm and urgent, prevent letting out and damaging the diaphragm by pressure.
2,Grind. Cause letting out after operating certain time between core of the valve and valve seat, will cause internal leakage between piston and cylinder block of the cylinder, should grind at this moment. Can go on, grind by hand, machinery rub sharpen, plate layers of treatment and inlay suit method, the granularity of diamond dust ground and used should be suitable, it should be even and suitable to grind strength. After grinding, should polish, and meet necessary smooth finish and precision requirement, the ones that met core of the valve and valve stand are right to hit the requirement etc., need to carry on sealing test after assembly.
3,The gland box changes. . The gland box should adopt the gland box of the same type while changing, should take care to tick the packing while changing, remove the packing correctly, prevent causing damaging to the valve stem. The installation of the new gland box should be according to the manual requirement, cut-outing should misplace, prevent scratching to packing of whorl of the valve stem, the impaction strength of the packing should be even and suitable, prevent causing the stress and increasing frictional force.
4,Change of the transmission part. Does if transmission part in regulating valve and attachment abrade partly and change, repair etc. the part? ? Should guarantee transmission is flexible, the interval of transmission tries hard to be small after changing and repairing.