Blog

26

2017

/

07

Five tips to quickly solve the valve sealing performance is poor

Many valves generally have poor sealing performance, and many users do not know how to solve them. Wuhan Xiete Valve Technology Co., Ltd. organized senior technicians to study carefully and quickly find out five effective ways to solve the poor sealing performance of the valve. Five effective ways to solve the poor sealing performance of the valve: 1. grinding method after grinding, eliminate traces, reduce or eliminate the sealing gap, improve the smoothness of the sealing surface, in order to improve the high sealing performance of the valve. 2. improve the sealing force of the actuator to improve the sealing force of the actuator to the valve core, it is also a common method to ensure that the valve is closed, increase the sealing ratio and improve the sealing performance. Commonly used

24

2017

/

07

Necessary protective measures shall be taken for valve installation

When installing the valve, the operator must understand its installation method, because the valve in the installation of protective measures is very important. If you do not pay attention to the installation is very easy to cause damage or leakage of the valve, it will cause a lot of trouble. So, what protective measures do we need to take when installing the valve? By Wuhan Xiete Valve Technology Co., Ltd. describes in detail the protective measures for the installation of the valve. Check valve protective measures in order to prevent leakage or failure of the check valve after the media backflow, resulting in product quality decline or cause accidents and other adverse consequences, the check valve will be set before and after one or two

16

2017

/

07

When installing the valve should pay attention to the following points

1. to the flow direction and installation position, many valves are directional, such as throttle valves, globe valves, check valves, proportional pressure reducing valves, etc. If the installation is reversed, it will affect the use effect and life of the product. It may not work at all and cause danger, etc. Some valves will indicate the direction on the valve body; if some valves do not indicate the direction, the correct direction should be identified according to the working principle of the valve. The valves produced by Wuhan Xiete Valve Technology Co., Ltd. have their own characteristics. The position of the valve at the time of installation should consider the convenient operation of the staff: Wuhan Xiete Valve Technology Co., Ltd. even if it encounters some difficulties in installation

14

2017

/

07

Inspection and transmission device of high pressure casting stop valve

Inspection and testing of high-pressure casting globe valves 1. Test standards The inspection and testing of valves produced by Wuhan Xiete Valve Technology Co., Ltd. shall be carried out in accordance with the prescribed standard operations. The test of the shell pressure shall be carried out before the valve surface treatment and painting. 2.100% pressure test shall be carried out before the valve leaves the factory. The valve pressure test shall at least include the following contents: upper seal test, shell test, high pressure water seal test, low pressure gas seal test and other tests specified in the specification. 3. After the test, drain the test medium in the valve body. 4.100% of all butt welds shall be subject to X-ray inspection. For PN160 and above pressure rating valve pressure parts

12

2017

/

07

The principle, function and classification of stop valve

Globe valve is forced to seal the valve category, when the valve is closed, must be applied to the disc pressure, in order to force the sealing surface does not leak. When the medium enters the valve from below the disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The strength of closing the valve is greater than that of opening the valve. The diameter of the stem must be large, otherwise the failure of the stem top bending will occur. According to the connection of the valve is divided into three types: flange connection, thread connection, welding connection. After the self-sealing valve appears, the medium flow direction of the stop valve enters the valve cavity from above the valve clack.

03

2017

/

07

Material Analysis of Casting Valve and Forged Valve

Casting valve is generally cast into the valve, under normal circumstances casting valve pressure grade is divided into high pressure, most of the caliber is above DN50. Forged valve is forged out, are generally used in high-grade pipeline, the caliber is relatively small, under normal circumstances are below DN50. Talking about the difference between the two: 1. casting valve 1, the so-called casting: is the process of smelting metal into a liquid that reaches certain requirements and pouring it into a casting mold, and obtaining a casting with a predetermined shape, size and performance after cooling, solidification, and cleaning. 2, cast out of the blank or parts cost is low, for the outside.

30

2017

/

06

The advantages and disadvantages of stop valve and installation precautions

The advantages and disadvantages of the globe valve and the matters needing attention in the installation of the globe valve has the following advantages: 1. the shape of the structure is simple, manufacturing and maintenance is more convenient. 2. The working stroke is small and the opening and closing time is short. 3. Good sealing performance, small friction force between sealing surfaces, wear resistance and corrosion resistance, and long service life. The disadvantages of the cut-off valve are as follows: 1. The fluid resistance is large, and the force required to open and close is large. 2. It is not suitable for medium with particles, strong viscosity, dust and easy coking. According to the type of valve stem thread position is divided into two categories, external thread type, internal thread type. According to the flow direction of the medium, there are three categories, straight-through, straight-through and angle. Cut

28

2017

/

06

Difference and relationship among nominal pressure, test pressure and working pressure

1. Nominal pressure (1) Nominal pressure-the compressive strength of the product at the reference temperature, expressed in PN, unit: MPa. (2) the reference temperature: material difference, the reference temperature will be different. For example, the reference temperature of steel is 250°C(3) and the nominal pressure is 1.0Mpa, which is marked as PN 1.0Mpa 2. Test pressure (1) The pressure for strength test of the product is expressed as Ps. (2) The test pressure is 4.0Mpa, which is recorded as Ps4.0Mpa. 3. Working pressure (1) The pressure on pipes and fittings under normal conditions is expressed in Pt. (2) t

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