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调节阀维修的具体操作

作者:佚名     发布日期:2014-12-7      点击:   

管线由于组合或安装不当会产生各种应力,例如高温介质产生的热应力,安装时紧固力不均衡造成的应力,人为的某些碰撞给调节阀及其管道造成的应力等。这些应力作用在调节阀及其管线上,很容易对调节阀的性能产生影响,严重时会影响到调节系统本身,导致阀杆和导向件变形而不能和阀座对准中心;对于分体式阀体的调节阀,可能引起阀体法兰的脱开;应力还可能引起阀座泄漏等。因此,任何时刻都要保证避免或消除应力,把应力导向远离调节阀的地方。
1.2检查支撑情况
安装调节阀的最佳位置是使阀杆的行程方向与阀体上方的执行机构在一个垂直平面上。如果调节阀必须安装在使阀杆水平移动的位置,或者阀杆的移动方向与水平面有一定的倾角时,就应该把执行机构支撑起来,使调节阀的各个部件都处于自然状态。如果不加设支撑或者支撑加设不当都可能造成调节阀阀杆与阀座的不同心,容易导致差变或使填料泄漏等故障。即使调节阀有固定和支撑措施,也必须定期进行检查,一般2~3个月检查一次。
1.3清除或防止异物进入要经常检查调节阀连接管道内有无铁锈、焊渣、污物等,发现后应及时清除。如果调节阀及管道中容易积聚异物,则要考虑在调节阀上游侧安装简易的过滤装置。在工艺介质中容易渗入硬质杂物的场合,一定要安装永久性的过滤装置。因为调节阀在关闭时,很小的一块铁锈或焊渣就足以破坏研磨得很好的阀座密封面,况且这些污物也会对调节阀阀芯和阀座造成磨损,影响其正常运行。
1.4定期检查气源和电源
气源是驱动调节阀的关键能源之一。气动调节阀的膜室虽然不消耗空气,但如果气源系统含有水分、油污等杂质,则会使阀门定位器、继动器等附件堵塞并发生故障。因此必须定期对气源和电源进行检查,保证气源清洁、干燥,电源可靠。
1.5定期检修和加油
填料和注油器在短期使用后需要重新调整。尘土多的场合要在阀杆周围用塑料套或橡胶套保护填料函和导向部位,有腐蚀性气体或液滴存在的场合要采用特殊的保护措施,一般用防腐袋包住调节阀,但要注意不能影响它的操作。在有耐火性要求的场合,可以采用特殊耐火涂料、套防火袋等方法,防火袋的材料含有多层陶瓷纤维或玻璃纤维。
1.6运输和保管
调节阀在组装和油漆并按要求装上执行机构、手轮、定位器等附件以后,为防止外来物质进入调节阀,连接调节阀的全部空气接口都要堵上,连接法兰装上保护罩,要留意各个连接部位,例如阀门定位器进气管、执行机构接口的状态。易损坏的任何突出的附件,如注油器和电位器的压力表,应从接头上拆下,与调节阀分开包装并一同运输。调节阀应用专用的支架固定,防止松动,要保证整体的垂直位置或水平位置。如果远距离运输,最好用牢固的木箱装运。 保管调节阀时,不要把调节阀支承在敏感部位,例如阀门定位器、阀杆等处。运输和保管的环境条件应满足产品说明书要求。保管区域最好不要进行其他作业,无法避免时,必须注意不要碰到调节阀。场所还要避免受风沙、尘土、雨水等恶劣条件的影响,如果没有合适的场所,在贮藏前必须把调节阀装在防潮袋中,或放在类似的容器中。
1.7安全运行的检查
对在爆炸性危险场所使用的调节阀和有关附件应检查其安全运行情况,例如,密封盖是否拧紧,安全栅的运行情况,电源供应情况等,保证调节阀及有关附件能够安全运行。
译文:
Regulating valve repair concrete operation: < br / > 1.1 to eliminate stress
Pipeline due to the combination or improperly installed can produce all kinds of stress, thermal stress of high temperature medium, for example, when installation fastening force caused by uneven stress, human some of the regulating valve and pipeline stress caused by the collision, etc. These stress on regulating valve and pipeline, it is easy to affect the performance of the regulating valve, seriously will affect the control system itself, lead to deformation of the valve stem and guide and cannot aim and seat center; For split type valve regulating valve, may cause the valve flange release; Stress may cause the seat leakage, etc. Any moment, therefore, make sure to avoid or eliminate stress, the stress direction away from the regulator.
1.2 check the support conditions
Install regulator is the best position to make the travel direction of the stem at the top of the actuator to the valve body in a vertical plane. If the regulator must be installed on the valve stem horizontal mobile location, or the movement of the valve stem direction and horizontal plane has a certain Angle, you should put actuator support, make the regulator of the parts are in a state of nature. If not described.compare or improper support adding may cause different heart valve stem and valve seat, can easily lead to poor or make packing leakage fault. Even if the regulator have fixed and supporting measures, must also be checked regularly, check general 2 ~ 3 months at a time.
1.3 remove or prevent foreign bodies from entering the often should check whether there is any rust on regulating valve connection pipe, welding slag, dirt, etc., should keep clear of in time. If among the accumulation of the regulating valve and pipeline, should consider side valve upstream of the regulator installation simple filtration unit. In the process of medium easy to penetrate hard sundry occasions, the permanent filter must be installed. Because the regulator in closing, a small piece of rust or welding slag was enough to destroy the valve seat sealing surface grinding well, besides the dirt on the regulator valve core and valve seat wear, affecting its normal operation.
1.4 check the air supply and power supply on a regular basis
Gas source is one of the key energy drive regulator. Although not consume air pneumatic control valve of the film room, but if the air supply system contains impurities such as water, oil, can make the valve positioner, relay and other attachment plug and failure. Must therefore be regularly check for gas source and power supply, ensure the air clean, dry, reliable power supply.
1.5 preventive maintenance and refueling
Packing and oiler needs to be adjusted after short term use. Many occasions to dust covered with plastic or rubber around the valve stem packing box and the guide parts, presence of corrosive gas or liquid droplets occasions to the use of special protective measures, the commonly used anti-corrosion bag by the regulator, but does not influence its operation. Where fire resistance requirements, can use special methods of refractory coating, cover fire bag, fire bags containing multilayer ceramic fiber or glass fiber materials.
1.6 transportation and storage
Regulating valve in assembly and painting and installed according to the requirement, the handwheel actuator, locator and other accessories, to prevent foreign matter into the regulator, whole air interface connecting the regulator to plug, connecting flange mount shield, to pay more attention to the connection parts, such as valve positioner intake pipe and actuators of the interface state. Any outstanding attachments, easily damaged the wound oiler and potentiometer pressure gauge, the fitting should be removed, with regulator separate packing and transportation. Regulator application special bracket, prevent loose, to ensure that the overall vertical or horizontal position. If long distance transportation, had better use strong wooden shipment.
Custody of the regulator, don't put the regulator support in sensitive areas, such as the place such as valve positioner, valve stem. Transportation and storage conditions should meet the product specifications. Storage area is best not to other assignments, inevitably, must be careful not to touch regulator. Place to avoid the negative conditions, such as sand, dust, rain, influence, if not the right place, must be the regulator in moisture bag in front of the store, or in similar containers.
1.7 the safe operation of the check
For use in explosive dangerous places the regulator and the related attachment should check the safe operation of the situation, for example, sealing cover are tight, the operation situation of safety barrier, power supply, etc., ensure to safe operation of the regulator and related accessories.

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