After after installation of valve, the operator to master the structure and properties of the Industrial Valves and transmission device, the correct recognition marks, indicating the valve open direction and the opening signal, etc. , and fluent and accurate operation of the valve, in a timely and decisively to deal with all kinds of emergency fault. operating correctly or not, directly affects its service life, stable and is related to equipment and devices, production safety. The operation of manual valves, manual valves are operating the Industrial Valves by hand wheel, handle, has been widely used in petrochemical plant, the operator should pay attention to the following: valve open direction, is usually a counterclockwise said valve is opened, clockwise said valve shut off. , therefore, should pay attention to when the switch valve pieces direction valve's handle, hand wheel size was designed according to human switch valve. Therefore, as long as the manual rotation valve switch can be realized, is generally not allowed to use leverage or wrench to switch valve. In order to prevent too hard and damage the sealing surface in pieces, and other parts when the closed to open gate and globe valve to the dead, to turn 1/4 to 1/2 times, make the thread a better seal, in order to avoid twist too tight, damaged pieces valves can't do the gate valve, globe valve throttle, such easy to flush valve plate and the sealing surface, and the introduction of leakage, vibration damage valve open the steam valve, should slowly open and expel water in pipes, to prevent water hammer phenomenon. Damaging the valve and pipe mixer large-diameter gate valve, globe valve and butterfly valve, some with by-pass valve, its effect is balanced on both sides of the valve pressure, reduce the opening force. So open, should first open the bypass valve, then slowly open valve, closing valves, should first close the bypass valve, then slowly close the main valve pieces some valve is turned off, when the temperature drops, the valve contraction, sealing surface appear small leakage phenomenon, at this time, should stay after the valve closed, again appropriate tight valve can automatically valve operation: before enabling the trap, shall discharge pipe in the dirt and impurities, prevent the sundry jam, not work properly. Operation, check the working condition, trap if excessive discharge of steam, shows that the operation of the valve if only discharge water, work pieces normal safety valve relief valves should be constant pressure inspection regularly, and make constant pressure records and identity, before the installation, should be constant pressure after pressure testing and inspection. The safety valve is offline tuning effect, production unit has a set of scientific management methods. In recent years, some units has introduced the safety valve online calibration instrument, it is composed of mechanical, hydraulic and electronic records, its advantage is more accord with actual production conditions, the data more real, and can not affect the production, do not need to tear open outfit and handling, and can improve the safety valve calibration rate. The disadvantage is that can only be used for spring safety valve, and valve stem must have a screw thread; Must know the average diameter of the valve sealing surface; Unable to relief valve for cleaning, polishing, replacement parts and air test. Such as safety valve and can't return after jump, run will be a lot of material, affect production, immediate measures should be taken, for processing. Its method is to use hand up a wrench valve, gap open a period of time, discharge dirt, etc. In pieces before reducing valve open the bypass valve or flush valve cleaning the pipeline, pipe clean after close the bypass valve to enable the pressure reducing valve. Other other valves of valve operation is with the aid of electric and electromagnetic actuator, pneumatic and hydraulic device for opening and closing of the valve. To realize the remote control by meter, electric switch and so on. So the operator should learn more about his move on structural characteristics and working principle of the valve, familiar with operational procedures, can the independent operation, than in the accident situation for emergency processing valve operation notice: mixer to prevent valve is staggered, wrong, leakage, leakage. Operators to the understanding of the role of each valve and position in the process piping, prevent wrong operation, otherwise may cause run material, mixing, pressure-out and other accidents. Such as an oil refining plant, before the start of the steam purging, an exhaust valve leakage after purging, as a result, the construction, the high temperature of 370 ℃ slurry from the vent valve to discharge, caused the fire, the introduction of plant shutdown. Low temperature season under 0 ℃, to stop valve, main antifreeze, promptly open the bottom plug valve, discharge the condensate water inside. The valve for the work of a continuous and cannot be ruled out to adopt measures to keep warm. Pieces of work under the high temperature of the valve, when the temperature rises to above 200 ℃, bolt thermal elongation, easy to make the valve seal is lax, required for bolt 'hot', hot tight, should not be in a seated position of the valve. Lest stem to death, and open problems. Mixer valve leakage, should first determine leakage reasons and positions, usually part leakage and external leakage, external leakage according to its external structure is divided into filler leakage and leakage of valve cover, valve body and sealing surface or lining material leakage, the operator should be accurate judgment, themselves to solve handled in time, can't solve to mechanic processing in a timely manner. Mixer valve packing gland shoulds not be too tight, with stem can turn flexibly advisable, too tight, will increase the stem friction, increase the operating torque, etc. work, usually can't bring pressure to replace or add packing, otherwise, cause the cause of the medium leaking dangerous.
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