Knife gate valve are found in our homes, our offices, our streets and in all our factories and factories. Fall Magazine’s print magazines cover some of these industries, including water and wastewater, power industry, oil and gas production, offshore industry, pipelines, refineries, chemical processing, liquefied natural gas and commercial buildings. This article continues to cover that.
Although the pulp and paper industry is not as large as before, the products are still in demand, and the plants are still full of knife gate valve. Some service conditions in the paper mill can be very harsh due to the corrosive nature of the various processes. This means choosing the valve material is very important. Typical paper mills use to depend strongly on 316 [stainless steel materials] for the construction of valves. However, closed circulating systems today include other impurities into the fluid stream, such as chloride, making the 316ss standard unsuitable. Nickel alloys and higher grade stainless steels are more clearly defined for paper mill services.
Paper mills and pulp mills also contain discharge lines requiring special knife gate valve. The design chosen in these applications is the knife door, with its sharp, slim cutting edge, which can cut through the muddy solids. Like all other complex processing plants, virtually every type of valve can be found in a paper mill and pulp mill. Since the industry is running on tighter margins these days, total cost of ownership is important to plant owners. Therefore, the pulp and paper mills are strong users of repair valves to increase the return on investment.
Sea knife gate valve perform various tasks on and under the deck. All boats require some form of energy to supply the engine, and valves regulate the stowage and storage of whatever is used. A diesel tanker can have only one fuel valve, while a large cargo vessel can have a complex pump and manifold with multiple fuel valves to various tanks on board. Typically, these tanks are located at strategic points to assist in ballast.
Vessels are important to the ballast and shore systems. These systems can use hand-held pipes or valves that can be as large as the NPS 30. The sea water knife gate valve must be very warm and designed to withstand the extreme hazards of harsh environment. Fire-extinguishing systems are also important in ships because no local fire service is called in case of an emergency at sea.
Today’s ships and barges are home to virtually all modern knife gate valve, not just old school gates, spheres and check valves. Ball valves are increasingly popular, including metal types. However, the valve was probably more recent intruded in the marine industry, which was controlled by the valve seat butterfly valve. The choice of smaller and lighter valves has proved popular in many marine applications.
Water itself can cause difficulties for the piping system because it can cause oxidation, which means that even marine knife gate valve materials for freshwater applications must be carefully selected. Increasingly, stainless steel valves and piping systems are installed in freshwater marine applications, replacing conventional carbon steel.
Brine is another circumstance: the carbon steel piping system will not last long in this environment. Sea water knife gate valve are usually copper, Cu / Ni or higher alloys such as Ni / Cr or Titanium. Copper aluminum is still popular because of the corrosion resistance of rational seawater combined with relatively low costs. Pressure classes for most marine applications are modest and usually below 300 psi.
A visit to the restaurant or bar with craft brewing activities reveals plenty of pipes, knife gate valve and shiny tanks. These facilities are basically small process plants designed to distill and create alcoholic beverages. Valves and pipelines for this purpose are similar to the biological knife gate valve because they are clean, with the inside surface not attracting or capturing any organic material. This means smooth interior as well as non-cavity design. The valves operate at low pressure and are almost always made of stainless steel or in some cases copper or copper.
The only aspect of the knife gate valve in this service is the terminal connection. These connections are classified as sanitary and polished furniture as well as end clamp connections. Due to the difficulty of cleaning, this valve is less common than a sliding door valve, with virtually no bag or area to fall into unwanted debris or organic material.
The biggest users of solar knife gate valve are solar thermal units that focus on the heat of the sun and use that energy to transfer heat to the environment to create steam. In other words, the fluid is heated and circulated in the receiver to produce steam. Valves for these devices are divided into two parts: piping for heat transfer fluid and piping system for steam treatment.
Knife gate valve in the heat transfer system must handle the pressure and temperature generated during heating. In addition, these valves also need to be compatible with the heat transfer fluid. Steam valves and pipelines comply with the design requirements of any other steam / turbine plant.
Solar power plants use photovoltaic processes to produce electricity without the need for pipelines of solar thermal power plants and therefore no piping and knife gate valve requirements.
Production of iron and steel and pipe / valve requirements for these two metals can be divided into two separate sections. Ironmaking is a powerful user of many valves, both unique and sometimes large in size. Iron is made in a blast furnace, where iron ore, coke and other additives are cooked at about the same temperature
The process of compressed air production, also known as the basic oxygen process, uses a mixture of scrap, liquid iron, pure oxygen, and additives for steel processing. The most important part of the process involves valves and pipes are the valves used in oxygen service. These knife gate valve must be specially cleaned to remove all traces of grease and oil before they can be used in pure oxygen lines.
Most American steel mills now use electric arc furnaces or continuous casting. It does not require as many pipes and valves as other processes.
The natural geothermal industry refers to hot air or water vapor in the ground. Energy use of these geothermal resources is carried out in various locations throughout the country. Depending on the nature and temperature of geothermal energy, the valve requirements may be similar to those of steam service, or just high requirements for hot water systems.
The valves for aerospace applications are usually very small. The most common types are solenoid valves and small hydraulic knife gate valve used to manipulate control surfaces such as engines, arms and rudders. Missile guided missiles and rockets use the same small valves and micro.
The orbiter missile launcher and exploration space are complex and have many pipelines. There are lines for liquid fuel, usually containing cold valves. Other utility lines contain a lot of liquids at different pressures and temperatures.
Large dams, especially hydroelectric dams, are full of valves of all sizes and types. There are gates, spheres, checks, balls and butterflies, along with some very special valve designs that are only used in the water improvement industry.
Dams are often not created to hold water and create attractive lakes. They are often built to provide water and in many cases to provide renewable electricity.
The purpose of the knife gate valve in these structures is to adjust the output of the reservoir while maintaining the appropriate reservoir depth, even in the case of flood or drought. A look at the moderately sized dam would indicate that some gates or drains provide the necessary flow adjustment to balance the water supply.
All significant dams require a controlled release of water due to changes in reservoir capacity, downstream water demand or minimum flow requirements. These situations require special valves designed to dissipate the large amount of energy generated by the high head of the dam.
At first glance it looks like almost any closed valve can operate. A closer look, however, at the operating conditions tells a different story. Exhaust valves, releasing water, are working at enormous volumes, at relatively high initial pressures and at high velocities. The combination of output flow conditions can lead to severe damage from cavitation at the knife gate valve outlet, so specially designed metal valves are typically used for this service.
This article and what appears in the print version of VALVE illustrates the expansion of the valve today is very broad. There are even valves in our cars and knife gate valve that control the blood in our hearts. Van is really everywhere.