Blog

30

2017

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10

High pressure safety valve installation notes

High pressure safety valve is a kind of safety protection valve, its opening and closing parts under the action of external force in a normally closed state. According to the structure, it is divided into vertical hammer type, lever type, spring type and pilot type; according to the valve body structure, it can be divided into closed type and non-closed type. The following are the matters needing attention when installing the high-pressure safety valve: 1. For boilers with rated evaporation greater than 0.5 t/h, at least two safety valves shall be installed; Boilers with rated evaporation less than or equal to 0.5 t/h shall be equipped with at least one safety valve. For boilers with rated steam pressure less than or equal to 3.82MPa, the safety valve throat diameter shall not be less than 25mm; For boilers with rated steam pressure greater than 3.82MPa, safety valve throat diameter. 2. The high-pressure safety valve should be installed vertically in the highest position of the pot dealer and header. Outlet pipes and valves for taking steam shall not be installed between safety valve and drum or header. 3, lever type safety valve to prevent the hammer to move their own device and limit the lever deviant guide frame, spring type safety valve to have a lifting handle and prevent casually twist the adjustment screw device. 4. The cross-sectional area of the connecting pipe between the high-pressure safety valve and the boiler shall not be less than the inlet cross-sectional area of the safety valve. If several safety valves are jointly installed on a short pipe directly connected to the drum, the passage cross-sectional area of the short pipe shall not be 1.25 times of the exhaust area of all safety valves. 5, the safety valve should generally be installed exhaust pipe, exhaust pipe should be straight to a safe place, and have enough cross-sectional area, to ensure the smooth flow of exhaust steam. The bottom of the safety valve exhaust pipe should be put on airs and have a drain pipe connected to a safe place. No valve is allowed to be installed on the exhaust pipe and the drain pipe. High-pressure valve 24-hour customer service hotline: if you are interested in or have questions about the above high-pressure valves, please click to contact the online customer service on the left side of our website, or call: 027-89708 619,027-89708339 Wuhan xiete-wholeheartedly for your choice of high-quality valve service. Wuhan Xiete Valve Technology Co., Ltd. is a professional manufacturing enterprise specializing in the R & D, production, sales and after-sales of various valves, filters, gas drains, and throttle orifices. It has 20 years of rich industry experience and owns Xiete Valve brand, has built the best R & D professional team in the industry, has a number of self-designed and developed patented products, and provides customers with the best valve function customization solutions, and has been successful for a number of enterprises, institutions to provide a professional design customization services. At the same time, Wuhan Xiete Valve Technology Co., Ltd. has obtained ISO9001 quality system certification and TS special equipment license. Our product types, complete styles, quality assurance, factory direct sales, economical, convenient and fast to provide customers with one-stop service! Address: No. 5 Shuangliu Zhengjie, Xinzhou District, Wuhan City, 24-hour service hotline: 027-89708339, 027-89708619 Fax: 027-89708939 Website: 027-http://www.xietevalve.com

26

2017

/

10

Causes of valve seal failure

Cause the valve seal failure mainly has the following several aspects: 1, natural failure because the seal is always in the medium, the sealing element to reach the service life of the valve seal failure. 2. Large fluctuation of pump inlet pressure may cause seal damage. When the pump inlet pressure is too small, the pressure in the pump cavity suddenly decreases, and the liquid in the sealing cavity returns to the pump cavity, resulting in dry friction of the sealing surface. The huge heat generated by the sealing surface in a short time cannot be taken away, thus causing the sealing surface to burn down and the seal to fail. When the pump inlet pressure is too high, the valve seal fails. 3. The seal failure caused by insufficient seal flushing mainly blocks the sealing cavity medium by forming a liquid film on the sealing surface. The function of the sealing flushing fluid is mainly to take away the heat on the sealing surface. When the sealing flushing fluid is insufficient or there is huge heat in the sealing cavity, which leads to the burning of the sealing surface and the failure of the seal. Pump chamber medium cut-off, seal chamber pressure suddenly reduced, seal effect ring sudden damage may cause seal flushing insufficiency. 4. Seal failure caused by bearing damage The position of the rolling body has changed after bearing damage, and the vibration of the pump has increased, resulting in valve seal failure. High-pressure valve 24-hour customer service hotline: if you are interested in or have questions about the above high-pressure valves, please click to contact the online customer service on the left side of our website, or call: 027-89708 619,027-89708339 Wuhan xiete-wholeheartedly for your choice of high-quality valve service. Wuhan Xiete Valve Technology Co., Ltd. is a professional manufacturing enterprise specializing in the R & D, production, sales and after-sales of various valves, filters, gas drains, and throttle orifices. It has 20 years of rich industry experience and owns Xiete Valve brand, has built the best R & D professional team in the industry, has a number of self-designed and developed patented products, and provides customers with the best valve function customization solutions, and has been successful for a number of enterprises, institutions to provide a professional design customization services. At the same time, Wuhan Xiete Valve Technology Co., Ltd. has obtained ISO9001 quality system certification and TS special equipment license. Our product types, complete styles, quality assurance, factory direct sales, economical, convenient and fast to provide customers with one-stop service! Address: No. 5 Shuangliu Zhengjie, Xinzhou District, Wuhan City, 24-hour service hotline: 027-89708339, 027-89708619 Fax: 027-89708939 Website: 027-http://www.xietevalve.com

24

2017

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10

Several Connection Methods of Pressure Transmitter Valve

There are three kinds of 1. flange connection methods for valve connection. This valve connection method is usually used for pressure and diameter pipeline connection. Its advantage lies in the convenience of assembly and disassembly. Its disadvantage lies in the high price of valves using this connection method, and when it works under the condition of more than 350 ℃, it is easy to cause relaxation of various parts, thus reducing the bolt load capacity, in severe cases, it may even cause leakage. 2. thread connection method The prerequisite for using this connection method is that there must be a through hole on the connected object. When the screw connection is made, it can be inserted directly into the through hole.

18

2017

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10

How to diagnose the fault of pilot relief valve

With the development of the hydraulic system of construction machinery, the pilot relief valve is widely used in the control circuit of the hydraulic system of construction machinery. In operation practice, in order to maximize its effectiveness and protect the control system, it is a key step to diagnose and eliminate the fault of the pilot relief valve accurately and timely. 1, control failure, so that the host does not move the pilot relief valve failure, will cause the host can not work. According to the current situation, the analysis of the reasons are: the pilot valve spool spring broken; Plinic hole blockage; The pilot valve port is poorly sealed; The main valve core is stuck. The corresponding elimination measures are: replace or add flat pads at the break for emergency use;

09

2017

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10

How to choose an electric regulating valve

Electric control valve is widely used in electric power, metallurgy, environmental protection, water treatment, chemical industry, light industry and other industrial production areas, is an essential part of industrial automation. Because of its environmental protection and simple and quick installation method has made a large number of users love and favor. Electric control valve according to the shape, size, parameter specifications and specific applications can be divided into different electric single seat control valve, electric sleeve control valve, electric double seat control valve, electric three way control valve, electric small flow control valve, electric angle control valve and so on. Although the type is different, but the same as the electric control valve, they have a lot in common, the user in the purchase

29

2017

/

09

Installation and maintenance of Y-type filter

Y-type filter is a device that uses a filter screen with punched holes or woven holes to block solid dirt in a fluid pipeline. In order to ensure the normal operation of the equipment, filters are generally installed in front of the equipment. Before installing the Y-type filter, carefully clean the threaded connection surface of all pipes, and use appropriate amount of pipe sealant or Teflon tape. The end threads are not treated to prevent sealant or Teflon tape from entering the piping system. The filter can be installed horizontally or vertically downward. Warning When installing the Y-type filter, it should be noted that the gasket of this type of filter is non-metallic and easy

25

2017

/

09

Function and Principle of Safety Valve

The safety valve is a protective device for boilers, pressure vessels and other pressure equipment, which is used to prevent the pressure in the pressure equipment from exceeding the design allowable value, so as to protect the safety of the equipment and its operators. Because the safety valve can not rely on any external energy and action, it is often used as the last protection device of pressure equipment. In this sense, its role cannot be replaced by other protective devices. When the pressure of the medium in the pressure equipment is greater than some reason and the abnormal rise, to reach the preset value, the safety valve automatically opens, and then a large number of emissions, in order to prevent the pressure continues to rise. When the medium pressure is at normal working pressure,

22

2017

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09

How to choose the right valve according to the flow characteristics

Valve opening and closing parts and the shape of the valve flow so that the valve has a certain flow characteristics. This should be taken into account when selecting valves. 1, cut off and connected to the medium used in the valve usually choose the flow resistance is small, the flow channel is straight-through valve. This kind of valve has gate valve, globe valve, plunger valve. Downward closed valve, due to the flow twists and turns, flow resistance is higher than other valves, it is less selected. However, in the case of higher flow resistance, closed valves can also be used. 2. The valve used to control the flow is usually a valve that is easy to adjust the flow. Such as regulating valve, throttle valve, plunger valve, because its seat size and opening and closing parts of the stroke

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