Improper packing, transportation and storage: valve denso packaging should be waterproof, moisture-proof, dustproof measures, the packing should be strong and reliable. In the process of transportation due and rainproof measures, the product to the scene should be stored in ventilated and dry place, not in open air. Commissioning or maintenance banned in rainy weather, after debugging to tighten all fasteners, reliable seal tightly in place to ensure that all electrical parts. Low protection grade: types of electric equipment form a complete set of valves for fully enclosed squirrel-cage motor structure, the short intermittent duty ( 10分钟) Since the cooling type. According to GB 4942. 1 - 85, the lowest level IP44, highest IP68 protection level. working condition and environment is different, have different requirements of protection class. Protection grade low lumen will cause motor be affected with damp be affected with damp or dust and other foreign invasion, the motor insulation resistance drop caused damage. types and motor model mismatch: the selected motor model and denso requirements do not match, did not have enough corresponding allowance, the actual output torque overload operation, easy to cause damage of motor. Electrical protection failure, poor quality of electrical components: valve types within the micro switch is the key to control body parts, when more than valve stroke position, micro switch to cut off the power supply, the overload protection function. Most denso factory will travel with the torque in series with the protection when the stroke or ultra torque, micro switch in time to cut off the control power, ac contactor coil so as to cut off the main loop of the motor. Selection of the denso and valve stroke, improper control of position adjustment: electric Industrial Valves is equipped with two important parameters. (1) opening and closing torque value should include the actual work torque value and valve torque value itself, open-close torque size affect the valve is used, great strength is bad, force small easy to leak. On the selection of supporting and due allowance ( General requirements is greater than the actual Industrial Valves operating torque value of 1. 1 ~ 1. 3 times) 。 (2) the trip position control and valve diameter size and length of opening and closing and structure form and so on. types of electric equipment form a complete set of motor for the special motor, short work, 10 - time 15min。 Such as work in a short period, high load, damage to cause the loss of the motor heat insulation class. Improper use debugging installation: (1) because the motor is valve for high load short work. If the debugging time is too long for more than the rated time, lead to motor damage of fever. (2) the valve installed types are divided into horizontal and vertical two kinds. In the vertical motor end when installation below. In thread sleeve rubber seal failure, the chamber of lubricating grease through cable and outlet into the motor internal cavity is easy to make the winding short circuit and burn out. (3) according to the JB - 8528 1997 regulation, the hand wheel rotation direction of the electric device should be consistent with the output shaft rotational direction and to close the valve clockwise, counterclockwise to open the valve. If not in conformity with provisions of actual rotation direction of motor, the need to change any two phase of three-phase power supply ( Switch) 。 Otherwise due to the inverse, disable protection motor damage. types and valve connection does not match: multi-turn valves types are divided into torque and thrust two kinds. Type torque mostly three jaw or key connections, valves, denso didn't inherit the axial thrust. Thrust type most for threaded connections, can withstand larger axial thrust. To valve types with connection between valve does not have to intervene with limit valve together with the surface and the valve is equipped with the appropriate clearance. Make the installation on the output shaft of the worm shaft not jumped out to a, to ensure that the worm gear and worm mesh mesh center plane has a good effect, guarantee the transmission torque at rated output torque value. Motor temperature protection failure: with temperature control switch, when the Industrial Valves motor in a moment or a long period of time when the operation, the motor temperature rise, more than set temperature, temperature control switch immediately to cut off the control circuit, protect the motor.
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When selecting the best products for customers, we considered not only the ductile iron gate valve, but also the y gate valve.
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