Blog

10

2018

/

10

Causes and solutions of lax valve closure

During the use of the valve, there are often some perplexing problems, such as the valve is not closed tightly or tightly. If the valve is not closed tightly, first confirm whether the valve is closed in place. If there is still leakage and cannot be sealed after it has been closed in place, then check the sealing surface. Some valve sealing pairs are detachable, then take them out for grinding and testing again, if it is still not strictly closed, it must be returned to the factory for maintenance or replacement of the valve, so as not to affect the normal use of the valve and the occurrence of working conditions and other problems. If the valve is not closed tightly, first find out where the problem occurs, however

25

2018

/

09

How to select and inspect high quality valve blank

Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The selection of valve blank should consider the following elements:(1) the material of the parts and the organization and performance requirements of the material. The part material specified on the design drawing generally determines the type of blank. For example: the part material is cast iron, it must be used to make the blank by casting method. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, the manufacture of high-pressure valve parts should generally choose forgings or weldments,

17

2018

/

09

What are the advantages of pressure reducing valve

The water flow pressure is adjusted through the internal pipeline of the valve to meet various environments where the water pressure is strict. The use of a wide range of pressure reducing valves can also be used in some special places. First: the use of water saving pressure reducing valve can play the effect of energy saving, because the water leakage rate and water flow waste degree and water pressure city is proportional to, so reduce the water pressure, also can reduce the waste of water flow, it can be used in the city to improve the water system, to reduce the effect of water, to achieve the effect of energy saving. Second: the damage rate of the pipeline is proportional to the degree of pipeline wear. The pipeline is at high pressure for a long time.

13

2018

/

09

Faults in the operation of electric actuators are related to their advantages and disadvantages.

Electric actuator habit is called electric actuator, it is a kind of can provide linear or rotary motion drive device, it uses some kind of drive energy and work under the action of some kind of control signal. Electric actuators can be divided into two categories: straight stroke and angular stroke. It is an indispensable and important equipment in the automatic control system. Its main task is to convert the control signal sent by the regulator into linear displacement or angular displacement in proportion. Drive valves, baffles and other regulating mechanisms to achieve automatic control. Therefore, it is widely used in the automatic control field of electric power, metallurgy, petroleum, chemical and other industrial sectors. Although the electric actuator has a wide range of applications, the advantages are clear.

11

2018

/

09

Large diameter valve

1. Analysis of the reasons for the difficulty in opening and closing large-diameter valves: Generally, the flow direction of the stop valve is designed to be low and high. When people close the valve, the human body pushes the handwheel horizontally to rotate to make the valve flap move downward to realize closing. At this time, it is necessary to overcome the combination of three forces: 1) axial thrust; 2) Friction between packing and valve stem; 3) The larger the diameter of contact friction between the valve stem and valve disc core, the axial thrust is also larger, and when it is close to the closed state, the axial thrust is almost close to the actual pressure of the pipe network. 2. Analysis of the causes of internal leakage of large-diameter stop valves. Large-diameter stop valves are generally used in boiler outlets, main sub-cylinders, steam main pipe and other positions.

03

2018

/

09

Several Maintenance Methods of Regulating Valve

There are two maintenance methods for regulating valves: first, preventive maintenance, which mainly refers to preventive maintenance measures taken when there is no failure in order to ensure the reliable operation of the regulating valve, including a series of preventive measures taken when the regulating valve is installed and used on site; The second is fault maintenance, that is, a series of maintenance work carried out when the regulating valve cannot meet the operation requirements under fault conditions, which is generally completed in the production workshop, under special circumstances, it is also possible to carry out maintenance directly on the pipeline. 1. Preventive Maintenance Preventive maintenance is a planned maintenance before the control valve fails and can be understood as routine maintenance, which usually includes the following.

30

2018

/

08

How to select and test high quality valve blank

Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The following factors should be considered when selecting the valve blank:(1) the material of the parts and the organization and performance requirements of the material. The part material specified on the design drawing generally determines the type of blank. For example, if the part material is cast iron, the blank must be made by casting. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, parts for the manufacture of high-pressure valves should generally be forged or welded

27

2018

/

08

Overload of electric valve

When using electric valves, we will generally take into account the relevant operational specifications, otherwise it will directly affect the role of electric valves. Therefore, it is necessary to pay close attention to these situations that may cause the electric valve to work overload: First, the work overload caused by the problem of the working power supply of the electric valve. Each type of electrical equipment has a specific working environment when working, such as power supply environment. If we do not configure the power supply for these devices in accordance with the prescribed working environment, it will definitely affect the normal operation of the equipment. So for the operation of the electric valve, the power supply

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