It is of great importance to equip the valve body with high strength. With defects in valve body, unexpected economic losses may occur someday after they are put in place. What’s more, it may put a period to the whole working system and take a exorbitant cost from the company, even the public. When it comes to material outputting, media leakage is not allowed., so do other defects like cracks, loose pores, slags to the body, cover and other parts. Besides that, to ensure the perfect performance of these apparatus, valve producers have to do do strength test to every valve. After all parts of the vale are assembled, the integrated piece will be send to do strength test. Usually, after rough machining, rough quality blanks and heat treated components will do intermediate strength test to spare unnecessary waste carried by all kinds of test failures. If all indicators are normal, further test are saved only if users insist.. The body strength tests are usually conducted under general temperature. And the testing pressure will be set 1.25 to 1.5 times higher than the nominal pressure. Valves are going to prove strong enough to pass the exam as long as these is no leakage within the allowed range. Another thing worth to be keep in mind is that air in the cavity should be output if the outputting material is water. Those above speak loudly that strength test id of great meanings and values. You could never assure its quality when its not strong enough. Therefore it is sure that the strength test is and will be the most important project in the valve producing field.

In the past, people tend to replace the old valve with a new one, and just throw or abandon those valves as garbage or sell them at a very low price. For some valves with high pressure/ high temperature/ large size, the cost of renewal is very high. Thus, we gradually realized the economic benefit of valve repair and maintenance. But before that, we should learn to use right method and excellent repairing equipment. Due to lack of concepts and equipment, most of users still replace old valves with new one, or just have an overhaul when the valve really broke down, which is not good to the valve service life and will bring potential risk of massive loss by emergency shut down or threatening people’s life. If the valve get overhaul only when it broke down without good care, this will bring the difficulty of repairing to a large extent, sometimes it is even too late to repair. Therefore, regular and organized checking and maintenance work mean a lot. It is critical to repair a small problem before it become big issue, since even a tiny damage on sealing surface could possibly leads to serious leakage accidents.

Safety valve is an important part of the pipe. In this article, we will have a brief introduction to the benefits of safety valves.   Firstly, with a wide size and type range, safety valves can be used to a lot of production environments.   Secondly, safety valve owns a high level of workmanship and product quality. In this way, it has a relatively service life as well as good performance during usage.   Thirdly, safety valves play a very important role in ensuring the pipeline safety and protecting human life.   Last but not least, safety valves, especially DIN standard safety valve have a smart design in valve structure, which leads to minimum troubles after sales and people can easily clean the valve due to its simple step of valve disassembly.

Pressure control valves, also called pressure valves in short, can control the pressure to meet the force and torque of actuators. There are several types of pressure control valves, like safe relief valve, pressure reducing valve, sequence valve, safety valve and etc. In this article, we will have a brief introduction of different pressure control valves. 1. Relief Valve The main function of relief valve is to keep hydraulic system stable and safe, preventing the overloading of system. 2. Sequence Valve Sequence valve can control the sequence of actuator by changing the pressure in hydraulic system. It has almost the same structure and working principle as the relief valve. The main difference lies in that the outlet of sequence valve is not connected to tanks. In this way, the internal leaking oil cannot channel directly to the oil chamber with pipeline, but by using a special pipeline instead. 3. Pressure Reducing Valve The pressure reducing valve consists of two parts: pilot valve and main valves. Its major function is to adjust oil pressure. The high-pressure oil enters into oil mouth, goes through the path of spool and orifices, then comes out from outlet of pressure reducing valve in a lower pressure state. In a short conclusion, although there are many varieties of pressure control valves, their fundamental purpose is the control of oil pressure.

Butterfly valve owns simple and compact structure with light weight. It can be easily and quickly operated by a 90° rotation. In addition, it has good performance on fluid control. The thickness of disc is the only resistance when the valve is in fully open condition, thus the flow resistance of butterfly valve is very small and can cause a minimum pressure loss to application. Due to its characteristic structure, butterfly valves are more suitable for large diameter valves. They are widely used in oil & gas, water treatment, petrochemical, as wells as thermal power station’s cooling water system. There are metal to metal sealing and soft sealing for butterfly valves. Although it does not has sealing performance as good as soft seal, metal to metal sealing butterfly valve can work in wider temperature range and application with particulates. Also, in terms of connection type, butterfly valves can be divided into wafer type butterfly valve and flanged butterfly valve. In conclusion, butterfly valves have advantages of good sealing performance, light weight, convenient operation, wide and flexible applicability, relatively lower cost and so on.

Features of underground fully welded ball valve 1. Due to its structure with minimum bolt connection, the valve often has light weight. 2. The valve stem is made of stainless steel with two anti-blowout o rings to ensure the operation. Its upper container can be replaced. Thus, buried fully welded ball valves can have long service life. 3. There are two mainly connection type, welded and flange connection. Strengths of underground fully welded ball valve 1. Emergency grease sealing system In case of leaking caused by application objects or fire accident, the emergency grease sealing system can ensure a temporary sealing by injecting grease into seat through grease gun. 2. Reliable stem sealing: Besides standard sealing ring, there is an additional O-ring in the packing gland to double secure the reliability. 3. Full bore and reduced diameter Full bore or reduced bore are available for users. 4. Extended stem option The valve stem can be extended according to customer’s actual needs, which is especially suitable for underground application. 5. Easy operation With superior self-lubricating property and small friction, the valve torque can be very small for easy operation.