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What is a ball valves?

What is a ball valve and how many types of the ball valve are there? The ball valve is a type of the rotary valve. The disc of the ball valve is the ball, which can rotate 90 degrees around the valve stem so as to fulfill the function of opening and closing the ball valve. The ball valve has the functions of not only cutting off the fluid, but also regulating the fluid. The ball valve can be made with various diameters. Ball valves made of different sealing materials and with various valve body structures can be used for […]

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Nine Anti-Corrosion Measures of Valves (2)

Adopting the surface treatment for metals Joints of valves Galvanization, chromeplate and oxidation treatments can be adopted for bolts of valves so as to improve the bolts’ resistance to air and corrosive media. Besides the above mentioned three methods, the phosphorization surface treatment method can also be used for other fasteners according to the specific circumstances. Sealing surfaces and closing elements with small larger diameters Generally, nitridation, boronizing and other surface treatments can be used to increase the corrosion resistance and wear resistance of sealing surfaces and closing elements with small diameters. Valve stems Nitridation, boronizing, chromeplate, nickeling and other […]

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An Introduction to Large Diameter Carbon Steel Flanges

There are some perforations bolts can go through on large diameter carbon steel flanges, and the bolts can make two flanges tightly connected with each other. Flanges are sealed through the gaskets. When the sizes of large diameter carbon steel flanges need to be determined, the nominal diameter as well as the nominal pressure of the flanges are supposed to be known. The nominal diameter of the pressure vessel flange should be two times the nominal diameter of the pressure vessel. For example, the pressure vessel with DN1000mm should be equipped with the large diameter flange with DN2000mm. The nominal […]

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What is a awwa butterfly valve

Butterfly valves are used to prevent and isolate the flow of fluid in industrial sectors. They are easy to handle and very fast in stopping the flow. They are majorly preferred by the customers because of its low cost and light weight. There are different types of butterfly valves are available in the market for wide range of uses and pressures. The leading manufacturers of AWWA Butterfly Valve have to meet the standards and norms of AWWA standard C504. Every manufacturer assures that every design of valve is better than the previous one. Awwa butterfly valve doesn’t leak from anywhere and won’t damage by corrosion. […]

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What are the Differences between Forged Steel Ball Valves and High Pressure Ba……

When ball valves are closed, there still pressure fluid exits inside the valve body. Lubricate high pressure ball valves with lubricating grease. The lubrication grease should be compatible with metal materials, rubber parts, plastic parts and working media of ball valves. Lubricate grease on the surface of the sealing elements’ installing groove, rubber sealing elements as well as the sealing surface and friction surface of the valve stem. Disconnect power supply or air supply before maintenance. Separate the actuator from the bracket before maintenance. Screw down bolts on the flange symmetrically, evenly and step by step before assembling. Non-metallic parts […]

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Nine Anti-Corrosion Measures of Valves

1. Selecting corrosion resistant materials according to corrosive media In the production practice, the corrosion of the medium is very complicated. Even if valves made of the same material have the same media, the conditions of each valve being corroded by media vary from each other due to the different concentration, temperature and pressure of media. If the temperature of the medium is increased by 10℃, the corrosion rate will be increased by about 1 to 3 times. The concentration of the medium can greatly influence the corrosion on the valve material. If the lead is in the sulfuric acid […]

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The Origin and Development of the Valve

Valves can be classified into block valves, regulating valves, check valves, diverter valves, safety valves and multi-purpose valves six categories based on their functions. Block valves are mainly used for cutting off fluid passages, and check valves, gate valves, plug valves, ball valves, butterfly valves, diaphragm valves and pinch valves also can be used for cutting off fluids. Regulating valves are mainly used to regulate pressure and flow rates of the fluids, and regulating valves, throttle valves, pressure reducing valves and float regulating valves also have the regulating functions. Check valves are used to prevent reverse flows of fluids. Diverter […]

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Applications of Eight Different Gaskets

1. Spiral Wound Gaskets Spiral wound gaskets skillfully take advantage of heat resistance, elastic resilience and strength of metal as well as flexibility of nonmetal materials. Therefore, spiral wound gaskets have good sealing performance, and stainless steel flexible graphite spiral wound gaskets have the best performance. Preload pressure of spiral wound gaskets is lower than asbestos spiral wound gaskets’. Therefore, spiral wound gaskets don’t have shortcomings of leakages. In the medium of oil, the metal strip is made of 0Cr13, and it is recommended that other media should be made of 1Cr18Ni9Ti. Working pressure of stainless steel flexible graphite spiral […]

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What Are the Knife Gate Valves? (2)

The knife gate valve with its sharp knife-shaped disc is used for liquids and gases with high density, and it was mainly applied to the paper industry at the very beginning. That is, this kind of gate valve is ideal for cutting off pulp. It is cheap, it is convenient to be operated;it is used for blocking the media such as sludge and slurry. As a result, the knife gate valve is quickly expanded into other fields. However, when the valve is used for dry bulk, its utility is greatly diminished. With the seal element around the disc, liquids can go through […]

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Surface Treatments of Stainless Steel Flanges

Stainless steel is a very common material for flanges, and the commonly used surface treatments of stainless steel flanges include surface clear whitening treatment, surface mirror brightening treatment and surface coloring treatment. Surface clear whitening treatment Stainless steel flanges have to go through the bending process, binding process, welding process, artificial surface roasted heating treatment, etc., which will result in the black oxide skin on the surface of stainless steel flanges. The main composition of the black oxide skin is NiCr2O4 and NiF, and the black oxide used to be removed by the strong corrosive hydrofluoric acid and nitric acid. […]

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