Blog

28

2017

/

08

Problems of Soft Seal Gate Valve in Use

1. soft seal gate valve packing leakage (1) packing gland is too loose, can be evenly pressed packing gland with nut tightening. (2) The number of packing rings is not enough, and the packing should be increased. (3) packing due to the use of too long or improper preservation of failure, should be replaced with new packing, replacement must pay attention to the joints between the ring should be cross staggered. 2. soft seal gate valve gate and valve seat sealing surface (1) There is dirt between the sealing surfaces, which needs to be flushed and eliminated. (2) If the sealing surface is damaged, it should be re-ground, and if necessary, it can be re-surfacing and processed. The ground sealing surface must be smooth and its roughness shall not be less than 0.4. 3. soft seal gate valve body and bonnet

25

2017

/

08

Valve connection mode and technical requirements

23

2017

/

08

How to choose and buy electric valve device and matters needing attention

Valve electric device is to achieve the valve program control, automatic control and remote control of essential equipment, the movement process can be controlled by the size of the stroke, torque or axial thrust. Since the working characteristics and utilization rate of the valve electric device depends on the type of valve, the working specification of the device and the position of the valve in the pipeline or equipment, the correct selection of the valve electric device is particularly important to prevent overload. How to choose the valve electric device is as follows: operating torque: the operating torque is the most important parameter to choose 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.

21

2017

/

08

Selection skills of electric control valve

Electric control valve is an important part in the industrial production process, with the continuous development of science and technology and the improvement of the quality and performance of the electric control valve, the electric control valve is used in various working conditions. The electric control valve has the advantages of environmental protection, energy saving, rapid installation, convenient maintenance, simple operation and high cost performance, which is loved and purchased by customers. 1, for the requirements of the flow and open height of the proportional relationship between the strict occasions, should choose a special control valve. 2. The ideal flow characteristics of the regulating valve are quick-opening, parabolic, linear, and other percentages. It can be selected according to the actual working flow characteristics.

18

2017

/

08

Classification and Precautions of Reversing Valve in Valve Application

The pneumatic directional valve is a control element in the pneumatic system, which is used to control the flow direction of the fluid in the system. There are many types of styles, and users can choose according to their needs. The common classification of valve in the use of valves is as follows: according to the outlet: two-way, three-way, four-way and five-way; according to the working position: two and three. According to the control mode, it is divided into pneumatic control and electric control, direct-acting type and pilot type. According to the controlled medium, it is divided into fluid valve and gas valve. According to the function, it is divided into normally closed and normally open, medium seal and medium discharge and intermediate gas supply. According to the structure, there are stop valves and slide valves;

16

2017

/

08

Common flange gaskets and use methods in valve application

At present, the valve commonly used flange gasket has the following forms, the flange gap is also different: 1. metal waveform gasket metal waveform gasket by the thickness of about 0.8mm of mild steel by stamping or rolling on the gasket surface and form a corrugated shape. After the gasket is compressed, the middle flange is sealed by the deformation of the wave crest. Because the gasket is very thin, its thickness is only about 0.5mm after deformation, so there is no obvious gap in the flange, which is basically no gap. 2. spiral wound gasket uses spiral wound gasket to make the flange have no gap, which may look like there is a gap on the outside, but in fact there is no gap.

14

2017

/

08

What are the important factors that cause valve damage

In valve applications, corrosion is the destruction and deterioration of materials under the action of various environments. Because corrosion is one of the important factors leading to valve damage, so Wuhan Xiete Valve Technology Co., Ltd. in the valve manufacturing process, anti-corrosion measures are the primary consideration. Valve corrosion is divided into the following several forms of metal valve corrosion has two forms: uniform corrosion and local corrosion. The rate of uniform corrosion can be evaluated by the annual average corrosion rate. Different parts of the valve are made of different grades of materials, and some parts can be made of less corrosive materials. 1, uniform corrosion uniform corrosion is in the metal

10

2017

/

08

Whether the flow resistance of the stop valve is higher than that of other valves

Valve stem axis perpendicular to the valve seat sealing surface, stem opening and closing stroke is relatively short, and has a very reliable cut-off action, so this kind of valve is very suitable for cutting off the medium or adjust and throttle use. Valve once in the open state, it is no longer between the valve seat and valve sealing surface contact, so its sealing surface mechanical wear is small, because most of the valve seat and valve is relatively easy to repair or replace the sealing element without the entire valve removed from the pipeline, which for the valve and pipeline welded into one occasion is very applicable. The direction of flow of the medium through such valves has been changed.

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