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Cadex (Yangzhou) Actuator Technology Co., Ltd. specializes in the development of electric valves and electric actuators

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How to choose the model of actuator

发表时间:2019-08-11 13:07:46 Article source: Publication time: 2019-08-11 13:07:46

Multi-turn valve electric equipment, referred to as Z-type Denso for short, is the driving equipment for the valve to be opened, closed or dispatched. Type Z Denso is suitable for gate valves, globe valves, diaphragm valves, plunger valves, throttle valves, water gate valves, etc. Can be used for both bright and dark stem valves. Multi-turn electric equipment is divided by protection type: outdoor type and flameproof type. Divided by control method: There are conventional type, all type and all dispatch type. Divided by connection type: torque type, power station type and thrust type.

Part of the rotary valve electric equipment, referred to as Q-type Denso. It is a driving device that completes the valve opening, closing, or scheduling control. It is suitable for 90-degree turning valves such as butterfly valves, ball valves, plug valves and dampers. Part of the rotary electric equipment can be divided into outdoor type and flameproof type according to the protection type: according to the control method, it can be divided into conventional type, overall type and overall dispatch type.

Valve electric actuator is a device that can not complete the valve program control, automatic control and remote control. Its motion process can be controlled by the stroke, torque or axial thrust.

Proper selection of valve electric equipment is essential to avoid overloading (working torque is higher than control torque).

Generally, the foundation protection method for overload is:

1. For the overload protection of the motor in continuous operation or jog operation, use a thermostat;

2. For the protection of motor stall, select thermal relay;

3. For short circuit, use fuse or over-current relay.

Valve electric actuator is a device that can not complete the valve program control, automatic control and remote control. Its motion process can be controlled by the stroke, torque or axial thrust.

Proper selection of valve electric equipment is essential to avoid overloading (working torque is higher than control torque).

In the past, the methods for protecting the motor were to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have their advantages and disadvantages. There is no reliable protection method for load-changing equipment such as electric equipment. Therefore, it is necessary to choose various combination methods. There are two types of induction: one is to judge the increase and decrease of the input current of the motor; These two methods, regardless of the type, must consider the time margin given by the motor thermal capacity.

The base protection method for overload is:

1. For the overload protection of the motor in continuous operation or jog operation, use a thermostat;

2. For the protection of motor stall, select thermal relay;

3. For short circuit, use fuse or over-current relay.

Overloading may occur if:

1. The power supply voltage is low, and the required torque cannot be obtained, causing the motor to tumble successively;

2. The torque binding arrangement is set by mistake so that it is greater than the successive torques, forming excessive torques that cause the motor to tumble successively;

3. It is used intermittently, and the heat savings that occur suddenly exceed the allowable temperature increase of the motor;

4. It is because of some reason that the torque binding arranges the circuit to malfunction, which makes the torque too large;

5. It is because the operating ambient temperature is too high, which relatively reduces the motor's thermal capacity.

Selection:

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

2. There are two types of host structure for operating thrust valve electric equipment: one is to directly output torque without the thrust disk; the other is to equip the thrust disk, and the output torque is converted to the output thrust through the stem nut in the thrust disk.

3. Rolling number of output shaft: The number of rolling number of the output shaft of the valve electric equipment is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of thread heads. The total number of rolls, H is the height of the valve opening, S is the pitch of the stem transmission thread, and Z is the number of stem thread heads).

4. Stem diameter For multi-turn type bright stem valves, if the maximum stem diameter allowed by electric equipment cannot pass through the stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the electric equipment 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 it is not necessary to consider the problem of the diameter of the stem, when selecting and matching, the diameter of the stem and the size of the keyway should be fully considered to ensure normal operation after assembly.

5. Output speed: If the opening and closing speed of the valve is too fast, water hammer will easily occur. Therefore, the appropriate opening and closing speed should be selected according to different operating conditions.

6. Valve electric actuator has its special requirements, that is, it must be able to bind torque or axial force. Generally, the valve electric equipment uses a coupling that binds the torque. When the electric equipment is confessed as standard, its control torque is also confessed. The motor is generally operated within a pre-approved time, and the motor will not be overloaded.

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