Valve-specific motor performance:

(1) valve motor torque to the valve opening and closing torque characteristics. General valve opening and closing value of the torque required to place a short time, while in the middle
 Running state, the desired torque value is only open on or off 1/3 of the maximum torque value, so the characteristics of the valve dedicated motor starting torque, high overload
 Ability. Special valve motor, maximum torque and rated torque values ​​greater than 3 times the starting torque and rated torque value three times.
② valve rotor shape elongated in the special motor design. Thus the high-speed rotation of the motor to the valve when the valve is closed to seal the additional inertial load
Can ensure reliable valve sealing surface, and not leave the valve sealing surface is damaged.
③ valve operation is intermittent, short-time working, thus the valve special motors working hours according to the provisions of the national standards was 10min, and some foreign products 15min.
④ outlet valve special motor end, junction boxes, fan-cooled high protective performance. General standard IP55, IP65, the highest level of
IP68 for submersible motors.

Dedicated valve Electrical fault analysis

Degree of protection: Denso supporting the valve dedicated motor is totally enclosed squirrel-cage structure, short-term intermittent working (10 min) cooled. According to the requirements of GB 4942. 1 - 85, the minimum protection class IP45, the highest protection rating to IP68. Valve using the different working conditions and environment, the level of protection. Degree of protection will cause the motor cavity damp or dust and other dust and debris, motor insulation resistance drop caused the damage.

Packaging, transport and properly maintained: valve Denso packaging should be rain, moisture, dust control measures, packaging should be solid and reliable. Should be rain measures to the scene and during transport should be stored in ventilated, dry place, shall not be open storage. Tighten all fasteners after the rainy weather, commissioning or maintenance, commissioning is prohibited, to ensure that all electrical part of the seal is tight and reliable.
Valve Denso selection and the stroke position adjustment control properly: electric valve equipped with two important parameters. The ① opening and closing torque value should include the valve actual torque value plus the valve itself torque value, the size of the opening and closing moments affect the valve, bad force, force leakiness. Should have enough headroom in the selection of supporting (usually greater than the valve of the actual operation torque value of 1.1 ~ 1.3-fold). Of ② stroke position control valve aperture size, the length of the opening and closing time and structure and so on. Valve Denso matching motor for a special motor, the short-time working, time 10 - 15min. In the short-time working hours, high load, resulting in insulation class of motor heating due to reduced damage.

Valve Denso motor model does not match: the selected motor type and electrical equipment requirements do not match the actual output torque is not sufficient headroom, ultra-load operation could easily lead to motor damage.
Protection of electrical failure, poor quality electrical components: micro switch valve Denso is the key components of the control mechanism, when the valve more than the stroke position, the micro switch to cut off the power from the overload effect. Most electrical equipment manufacturers in series with the trip and torque protection, when the overtravel or super torque micro switch to cut off the exchange contactor coil control power to cut off the motor main circuit.
 Temperature protection loss of motor: motor equipped with temperature control switch, when the valve motor in the moment or long-term operation, the motor temperature exceeds a set temperature, the thermostat switches immediately cut off the control loop, since to protect the role of the motor.

  Debug improper installation is divided into horizontal and vertical installation of two kinds: ① valve Denso. Motor end of the vertical installation at the bottom. The threaded sleeve rubber seal failure, the body cavity of the grease into the motor cavity easy to make a winding short circuit and burn out the motor cable outlet. ② according to GB 8528 - 1997 stipulates that the hand wheel rotation direction of the electric device and the output shaft rotation in the same direction, clockwise to close valve counterclockwise to open valve. If the actual motor rotation direction inconsistent with the provisions of any need to replace the three-phase power two-phase (can be reversed). Otherwise, due to the inversion, so that the protection measures fail to cause motor damage. ③ Because of the special valve motor is a high load of short-time working. For debugging too long to exceed the rated time, resulting in damage to the electrical heating.