Zhejiang nitrogen sealed share 7 regulating pneumatic valve pneumatic valve preventive maintenance content

regulating pneumatic valve repair generally has two kinds: one is the preventive maintenance, mainly refers to in order to ensure regulating pneumatic valve and reliable operation, and the failure to take the preventive maintenance measures, including adjusting the pneumatic valve in installation and use of a series of preventive measures; 2 it is fault maintenance, namely regulating pneumatic valve can not meet the requirement of the operation under fault condition when conducted a series of maintenance and repair work, normally done in production workshop, special circumstances may also directly on the line for repair. Below we first to get to know regulating pneumatic valve preventive maintenance.
preventive maintenance is in regulating pneumatic valve failure occurs before the planned maintenance, can be understood as a daily maintenance, usually includes the following work.
and check the support time,
installation regulation pneumatic valve is the best position to make air travel direction of the stem and pneumatic valve at the top of the actuator in a vertical plane. If regulating pneumatic valve must be installed in the pneumatic valve lever to level position, or pneumatic valve rod movement direction and horizontal plane has a certain Angle, you should put actuator support, make adjust the various components of the pneumatic valve is in natural state. If not described. compare or improper support adding can contribute to regulating pneumatic pneumatic valve stem and valve seat of different heart, easy to cause the bad change or make packing leakage fault. Even if regulating pneumatic valve has a fixed and supporting measures, must also be checked regularly, general ~ check once a month.
, safe operation check
in the adjustment of the explosive dangerous sites use pneumatic valve and relevant attachments shall check its safe operation, for example, sealing cover are tight, the operation situation of safety barrier, power supply, such as regulating pneumatic valve and related accessories to ensure safe operation.

, 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, man-made some regulating pneumatic valve and pipeline stress caused by the collision, etc. The stress on regulating pneumatic valve and pipeline, it is easy to impact on adjusting the performance of the pneumatic valve, seriously will affect the control system itself, resulting in pneumatic valve stem and guide a deformation and cannot aim and pneumatic seat center; For the adjustment of the split type pneumatic valve pneumatic valve, may cause release of pneumatic valve flange; Stress may cause the pneumatic valve seat leakage, etc. Any moment, therefore, make sure to avoid or eliminate stress, the stress direction away from the adjustment of pneumatic valve.
, remove, or to prevent foreign matter into the
often should check whether there is any rust on regulating pneumatic valve connection pipe, welding slag, dirt, etc. , should keep clear of in time. If the adjustment among the accumulation of the pneumatic valve and pipeline, want to consider in regulating pneumatic valve upstream side installation simple filtration unit. In the process of medium easy to penetrate hard sundry occasions, the permanent filter must be installed. For regulating pneumatic valve in the closed, a tiny piece of rust or welding slag grinding was enough to destroy good pneumatic valve seat sealing surface, and the dirt on regulating pneumatic valve pneumatic valve core and pneumatic valve seat wear and affect their normal operation.
, regularly check the source and power supply
air driven in regulating pneumatic valve is one of the key to energy. The membrane of the pneumatic control valve chamber, though not consume air, but if the air supply system contains impurities such as water, oil, can make the pneumatic 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.
, transportation and warehousing
regulating pneumatic valve in assembly and painting and installed according to the requirement, the handwheel actuator, locator and other accessories, to prevent foreign matter into the regulating pneumatic valve, pneumatic valve connection to adjust all the air interface to plug, connecting flange mount shield, to pay more attention to the connection parts, such as pneumatic 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 separate regulating pneumatic valve packing and transportation. Adjust the bracket of pneumatic valve application dedicated, prevent loose, to ensure that the overall vertical or horizontal position. If long distance transportation, had better use strong wooden shipment.
keep adjusting the pneumatic valve, don't adjust the pneumatic valve bearing on sensitive areas, such as pneumatic valve positioner, the place such as pneumatic valve stem. Transportation and storage conditions should meet the product specifications. Storage area is best not to other operations, is inevitable, must be careful not to encounter pneumatic valve adjustment. Place to avoid the negative conditions, such as sand, dust, rain, influence, if not the right place, in front of the store must be put regulating pneumatic valve in moisture bag, or in similar containers.
, preventive maintenance and refueling
packing and oiler needs to be adjusted after short term use. Many occasions to dust around the air valve stem covered with plastic or rubber stuffing box and the guide parts, presence of corrosive gas or liquid droplets occasions to the use of special protective measures, generally with anticorrosive bag encase pneumatic valve adjustment, 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.