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The high-temperature conditions here refer to the conditions when the medium temperatures are equal to or higher than the starting creep temperatures of the metallic materials. The creep temperature of carbon steel is about 400℃; chromium molybdenum alloy steel 450℃; austenitic iron-based high-temperature alloy steel 540℃; nickel-based high-temperature alloy 650℃; aluminum alloy 200℃; titanium all...
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Installation requirements for cryogenic valves Due to the special structure of cryogenic valves, the installation of cryogenic valves also has special requirements. Because of the long-neck bonnet of the cryogenic valve, cryogenic gate valves must be installed vertically upward, with the stem direction within a 45-degree angle. And it should also be avoided as much as possible to install...
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Butterfly valves have been around for a long time and are used in a variety of applications. They made their debut in the 1930's and have been used in several industries ever since. There are several different types of butterfly valves, but they fall into two basic types - lug valves and wafer valves. A butterfly valve is recognized as a "quarter-turn" valve. The valve is designed...
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Ball valves are usually found in controlling the flow of high-weight fluids and gas lines. This is because that these valves don’t reduce the flow weight and limit liquid flow. Ball valves are dominantly put in where the supply pipe’s internal breadth is 6 inches or less. A ball valve is a valve used to divert the flow. When open, it gives access to the medium and when closed, it cuts off the medi...
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Bronze and brass are two of the most common materials used to produce valves. This preference comes because both metals are quite malleable. They both are artificially made from natural metallurgical elements: brass is made from copper and zinc, while another is made primarily from copper and tin. Each metal offers valves numerous and various advantages...
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The biggest difference between a knife gate valve and a flanged gate valve is that gate valve is manufactured according to ANSI , while knife gate valve meets TAPPI Standards. Gate valves are also flanged, wider in size, ANSI pressure rated, and their API leak tightness standards need to be met as well. Gate valves are bi-directional, widely used in fluid applications, and they only come with meta...
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For high-pressure piping systems where multiple pumps are used together, the problem of water hammer in the piping system is even more acute. Water hammer is a pressure wave of the ever-changing flow in a pressure pipe, which is a hydraulic shock caused by a pressure rise or fall due to the change in the fluid flow rate in the pressure pipe. Water hammer is the combined result of the inc...
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The ball of the floating ball valve is suspended. Under the pressure of the medium, the ball will move and press against the outlet side of the seal. The floating ball valve is only widely used for medium and low-pressure conditions because the pressure of the medium completely transfers the ball weight to the seal at the outlet. For the same reason, the design of the floating ball valve should fo...
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If the medium remained in the cavity after the cryogenic gate valve is closed, the residue will gradually absorb the heat in the air and re-gasify. After the gasification, it will expand violently up to 600 times and generate extremely high pressure on the valve, which is called 'abnormal boost'. When the unusual occurrence happens, the wedge will be pressed firmly onto the seat and can’t be opene...
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