Regulating valve repair generally has two kinds: one is the preventive maintenance, mainly refers to in order to ensure that the regulator reliable operation, and the failure preventive maintenance measures, including adjusting valve in installation and use of a series of preventive measures; 2 it is fault maintenance, namely the regulator cannot satisfy the operation requirements under fault condition of a series of maintenance and repair work, normally done in production workshop, special circumstances may also directly on the line for repair. Preventive maintenance and preventive maintenance is plans to overhaul before regulator malfunctions, can be understood as a daily maintenance, usually includes the following work. 1. Eliminating 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. 2. Safe operation of the check for regulating valve used in explosive dangerous sites and related accessories 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. 3 check support 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. 4 to 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 Industrial Valves 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. 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. 6 transport and store the regulator in the 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. 7 regular check gas source and the power source is one of the key energy to drive the 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.
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