Blog

02

2018

/

07

Wide range of electric actuators

Electric actuators are also customarily called electric actuators, electric heads. Including two parts: electric actuator and regulating valve. The control accuracy is mainly determined by the control performance of the electric actuator. It can convert the control signal of the system into the angular displacement and linear displacement of the output shaft, and control the position of the valve and other intercepting parts or other adjustment The mechanism makes the controlled medium work according to the system requirements. With the development of industrial automation, the requirements for industrial production automatic control systems are getting higher and higher, so the requirements for various electric actuators are getting higher and higher, which makes the market a variety of actuators flooding, varieties and shapes.

21

2018

/

06

Electric actuator control function

At present, there are two types of electric actuators, generally divided into part of the rotary electric actuator and multi-rotary electric actuator, the former mainly control the need for part of the rotary valve, the latter need to rotate the number of turns of the valve. Environmental conditions: refers to the environmental characteristics that can affect the performance of electric actuators, such as temperature, humidity, air pressure, magnetic field, mechanical shock, vibration, dust, etc. 2. Dynamic conditions: refers to the dynamic characteristics that can affect the performance of electric actuators. 3. Load conditions: refers to the load characteristics that can affect the performance of the electric actuator, such as torque, the type and characteristics of the controlled object, etc. 4,

19

2018

/

06

Forged steel globe valve three kinds of body cover connection form

The first: the body cover bolt connection forged steel globe valve, according to the design of this connection form of the valve, the valve body and the valve cover with bolts, wound gasket seal, the advantage is easy to repair. The second: the body cover welding connection forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover full welding seal, the advantage is no external leakage. The third type: pressure self-tightening valve cover forged steel globe valve, according to the design of this connection form of the valve, the valve body and the valve cover with screw mosquito connection, internal pressure from the sealing ring seal, the advantage is that the greater the internal pressure, the better the sealing performance. Wuhan Xiete Valve Technology Co., Ltd. reasonably selects according to the actual situation of customer requirements.

11

2018

/

06

Dynamic and static seals of valves

Valve dynamic seal, mainly refers to the stem seal. Do not let the valve with the valve stem movement and leakage of the medium, is the central subject of the valve dynamic seal. The basic form of stuffing box is:(1) gland type: this is the most used form. (2) compression nut type: this form, small size, but the pressing force is limited, only used in small valves. The filler has the following requirements:(1) good sealing;(2) corrosion resistance;(3) friction coefficient is small;(4) adapt to the medium temperature and pressure. Commonly used fillers are:(1) Asbestos packing: Asbestos packing has good temperature resistance and corrosion resistance, but when used alone, the sealing effect is not good, so it always

07

2018

/

06

Precautions when installing pipeline valves

Be sure to pay attention to check before installing the 1. 1. Carefully check whether the valve specifications and models meet the requirements of the drawings. 2. Check whether the valve stem and disc are flexible, stuck and skewed. 3. Check whether the valve is damaged and whether the thread of the threaded valve is correct and intact. 4. Check whether the combination of the valve seat and the valve body is firm, the connection between the valve clack and the valve seat, the valve cover and the valve body, the stem and the valve clack. 5. Check whether the valve gasket, packing and fasteners (bolts) are suitable for the requirements of the nature of the working medium. 6. The old or placed longer valve should be removed, dust, sand and other impurities must be cleaned with water. 7. Clear

04

2018

/

06

Analysis of Noise Causes of Pressure Reducing Valve

The causes of noise can be divided into the following three categories: 1, the valve mechanical vibration noise; 2, fluid dynamics noise; 3, aerodynamic noise. 1. mechanical vibration noise pressure reducing valve parts in the fluid flow will produce mechanical vibration, mechanical vibration can be divided into two forms: ① low frequency vibration. This vibration is caused by the jet and pulsation of the medium, which is caused by the flow rate at the outlet of the valve is too fast, the pipeline arrangement is unreasonable, and the rigidity of the movable parts of the valve is insufficient. ② High frequency vibration. This vibration in the natural frequency of the valve and the medium flow caused by the excitation frequency is consistent, hydraulic

01

2018

/

06

Maintenance principles during valve operation

As follows: 1. keep the external and movable parts of the valve clean and protect the integrity of the valve paint. The surface of the valve, the trapezoidal thread on the valve stem and the valve stem nut, the sliding part of the valve stem nut and the bracket, and the gears, worm gears and other components are easy to deposit a lot of dust, oil and media residue and other dirt, causing wear and corrosion to the valve. Therefore, should always keep the valve clean. The general dust on the valve is suitable for brush sweeping and compressed air blowing, and even can be brushed with copper wire until the processing surface and mating surface show metallic luster, and the paint surface shows the natural color of the paint. 2. maintain valve lubrication, valve trapezoidal thread, stem nut and bracket

23

2018

/

05

Use and Maintenance of High Pressure Valve

In the power plant high-pressure valve is a very important equipment, the production of power plants have a great impact on the form and characteristics of high-pressure valve analysis, to better understand its working principle and types, but also in the use and maintenance of better development. In the two single-phase media of gas and water, the pipeline valve can better form a very safe and reliable use. In the thermal power plant, the steam system in the drainage system of the valve is not paid attention to, but in the regular drainage system, the valve has been widely used. In the process of continuous development of power plants, the capacity of units will continue to increase.

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