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Quilt Ball valve
Quilt gate
Quilt Butterfly valve
Quilt Shut-off valve
Quilt Electric valve
Quilt Control valve
Quilt The electromagnetic valve
Quilt Shut-off valve
Quilt Safety valve
Quilt Check valve
Quilt Drain valve
Quilt Needle valve
Quilt Balancing valve
Quilt Pressure reducing valve
Quilt Diaphragm valve
Quilt Vent
Quilt Stopcock
Quilt Plunger valve
Quilt Flame arrester
Quilt Breathing valve
Quilt Steam trap
Quilt filter
Quilt Discharge valve
Quilt Drain valve
Quilt Pneumatic valves
Quilt Regulating valve
Quilt Vacuum valve
Quilt Hydraulic valve
Quilt Valve fittings
Quilt Hydraulic control valve
Quilt Self-operated valve
Quilt Electric two-way valve
Quilt Oilfield special valve
Quilt Special valve for liquefied petroleum gas
Quilt Inlet valve

How to choose electric valve

Release time: 2014/11/20

1. Operating torque

Operating torque is the most important parameter for selecting the valve electric device. The output torque of the electric device should be 1.2 to 1.5 times the maximum torque of the valve operation.

2.Operating thrust

The main structure of the valve electric device has two types: one is to directly output torque without a thrust disk; the other is to configure a thrust disk, and the output torque is converted to output thrust through the valve stem nut in the thrust disk.

3.Number of rotations of output shaft

The number of rotations of the output shaft of the valve electric device is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of screw heads. Opening height, s is the thread pitch of the stem transmission thread, z is the number of stem thread heads).

4.Stem diameter

For multi-turn type bright stem valves, if the maximum valve rod diameter allowed by the electric device cannot pass through the valve stem of the valve, the electric valve cannot be assembled. Therefore, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the stem of the bright stem valve. For the part of the rotary valve and the multi-turn valve of the dark-stem valve, although the passage of the stem diameter need not be taken into consideration, the diameter of the stem and the size of the keyway should be fully taken into consideration when matching, so that it can work normally after assembly.

5.Output speed

If the opening and closing speed of the valve is too fast, water hammer may easily occur. Therefore, the appropriate opening and closing speed should be selected according to different use conditions. Valve electric devices have special requirements, that is, they must be able to limit torque or axial force. Valve electric devices usually use couplings that limit torque. When the size of the electric device is determined, its control torque is also determined.

The motor is generally operated within a predetermined time, and the motor will not be overloaded. However, the following conditions may cause overload: First, the power supply voltage is low, the required torque cannot be obtained, and the motor stops rotating; second, the torque limit mechanism is incorrectly adjusted to make it larger than the stopped torque, Causes continuous excessive torque to stop the motor. Third, intermittent use, the heat generated exceeds the allowable temperature rise of the motor; fourth, the torque limiter circuit malfunctions for some reason, causing the torque to be excessive. Large; Fifth, the use of ambient temperature is too high, which relatively reduces the motor's thermal capacity.

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