Check valves are simple devices that allow fluid media (gas, liquid or solids such as sand or slurry) to flow only one way. Typical check valve installations are found in industrial plants, automobiles, plumbing and ventilation systems. Usually, check valve are relatively inexpensive, compared to more accurate control valves. For a given application, the valve body must be able to contain the media and pressure, and the gate action must have a durable service life. Installing check valves is a matter of determining the correct flow direction for the media and ensuring proper fittings for the inlet and outlet port.
Installing the correct check valve for a particular process means knowing the media the valve will control. Caustic or abrasive media (lime slurries, acids, cement mixes, etc.) require a check valve resistant to severe corrosion; stainless steel or ceramic check valves work well for such applications. A check valve installed to control hot water flow in a plumbing installation can be made from PVC plastic, brass or steel. As long as the valve can handle the heat and pressure of a standard water line, it will work well.
Installing a check valve is similar in procedure to installing any other valve with one important distinction: direction. The valve must be installed in the media’s flow direction–nothing can move against a closed check valve gate. Check valve manufacturers include on the valve body an arrow indicating proper flow direction.
Incoming and outgoing lines can be connected using clamps, swage fittings (fittings using a collar around the line, with the fitting and the valve stem hydraulically compressed together) or threaded fittings.
Check valves work automatically to eliminate back flow in a process line. There’s no need for manual operation–the valve can be installed in relatively inaccessible locations. Although other valve installations may require clearance for actuators, access to a manual valve shut off or other features, check valves require little maintenance.
If installed as a diversion valve to relieve excess pressure or heat, the check valve gate can be adjusted to respond to specific pressure settings. For example, a check valve can prevent a steam boiler from building up too much pressure or a car’s radiator from rupturing when the coolant fails: the check valve will divert the high pressure media away from the process and avoid catastrophic failure. When pressure and heat amounts remain within operating limits, the check valve will stay closed.
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A plug valve is a simple type of valve that allows or blocks the flow of a liquid through a pipe. The plug itself is often shaped like an upside-down ice cream cone or a cylinder. A handle on top allows the user to turn the plug valve so it rotates and stops or starts the flow of liquid. A minimum of two holes, known as ports, must exist in the plug for liquid to flow. The ports are located on opposite sides of the plug, and when the plug is turned to the open position it creates a passage for the liquid to flow through.
This arrangement of two ports is known as a 2-port valve. The pipe in which the plug valve is installed has an area for liquid to flow in and another for liquid to flow out. When the 2-port plug valve is turned on, the ports line up with the holes in the pipe and the liquid flows straight through as if the plug valve was not there. Other, more complex plug valves known as 3-way valves allow liquid to flow to a combination of different ports. One port may connect to either of the opposite two ports, or all three may connect at once.
Two major categories of vales exist: stop valves and check valves. Stop valves follow a basic design structure to turn the flow of liquid on and off, or allow partial flow. Check valves, in contrast, allow liquid to travel only one way and often do not have a handle. Plug valves fall into the stop valve category.
Other stop valve types include gate valves and ball valves. Though similar to plug valves, the shape of the parts and how they work to stop the flow of liquid typically determines the specific group they belong to. Regardless of group, stop valves typically control liquid through the use of a handle.
Operation of a plug valve is simple, making it a common valve choice. The user twists the handle and the ports are moved away from the opening in the pipe. In certain valves, a full turn is not required. Quarter-turn valves, for example, only require the user to make a short, quarter turn to stop the flow of liquid. Often, plug valves can lessen the flow without turning off completely if the user turns the valve half-closed but leaves it open wide enough for some liquid to make it through the ports.
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- Check valves are devices that are installed in pipelines in order to stop the backflow of material. In many cases, the material flowing through the pipe is water, and the check valve keeps the water from flowing backwards in the pipe. They do not require any outside activation, but are rather designed with mechanisms that block the water from reversing direction at a certain point.
- Water check valves are used in several different devices, and they are advantageous for several reasons. For example, they stop flooding or overflowing in sump pumps and water heaters. They protect equipment in control valves, strainers and flowmeters. They also save power, because the backwards-flowing water would use up electricity even when the device was off.
- There are several types of check valves that are installed in water-using devices, but they are all based on the same underlying principle. A ball check valve consists of a ball held in place by a spring. When the water flows forward, the spring contracts and the ball is pushed away from the opening of the valve. Therefore, the water can flow through the valve. When the water stops flowing, the spring pushes the ball back into the opening in the valve and stops the water from flowing backwards.Swing valves work in a similar way. Instead of a ball, swing valves contain a small door on hinges. When the water flows by the door, the door swings back on its hinges and allows the water through. When the water stops flowing, the door slams shut and stops any backflow from forming.Similarly, a split-disk check valve contains a metal plate that folds in half as the water flows past it. When the water stops flowing, the plate springs open and blocks the entrance of the valve.
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According to researcher, the Global Instrumentation Valves and Fittings market is expected to grow from $3.86
billion in 2015 to reach $5.63 billion by 2022 with a CAGR of 5.5%. Huge requirement for valves and fittings in in
dustrial automation in fumes, fluid, and gas control applications is the major factor driving the market growth. In
addition, growth in usage of instrumentation valves on account of increasing growth rate of hyperbaric oxygen
therapy devices is also favouring the market growth.
Ultraclean valves market is anticipated to grow at a higher CAGR during the forecast period. It is attributed to exte
nsive usage in pharmaceutical sector for ultra-hygienic applications. The oil & gas application is leading the glob
al market. It is led by increasing market demand for valves in the instrumentation valves & fittings market. North
America and Europe are projected to be the leading markets in terms of market size, during the forecast period. A
sia Pacific and Latin America are expected to witness high growth rate during the forecast period.
Some of the key players in global instrumentation valves and fittings market include Fujikin., Dwyer Instruments,
Fitok, Bray International Inc., Braeco., Hoke., Hex Valve, Ham-Let, Astectubelok, As-Schneider, Hy-Lok, Ssp Fitt
ing, Oliver Valves, Safelok, Swagelok, and Parker Hannifin.
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This research report titled ‘Global Valves and Manifolds Market 2016-2020’ provides an in-depth analysis of the market in terms of revenue and emerging market trends. This market research report also includes up to date analysis and forecasts for various market segments and all geographical region
Based on product, the report categorizes the global valves and manifolds market into the following segments: ball valves, needle valves, check and relief valves, manifolds, and others. The top three revenue contributors are illustrated below:
Global ball valves market
Technavio predicts the global ball valves market to reach USD 432.9 million by 2020, an increase from USD 320.8 million in 2015.
Ball valves are capable of withstanding corrosive substances flowing through them. Operating temperatures range from as low as -328°F to 932°F. These valves can endure the high pressure of compressor stations that are used to keep the movement of natural gas smooth through pipelines. Ball valves find extensive application in the oil and gas industry, specifically for FPSO, pipelines, offshore production platforms, gas storage applications, tank farms, specialized LNG applications, and emergency shut down situations.
According to Anju Ajaykumar, a lead analyst at Technavio for research on tools and components, “Increase in the construction of new industrial plants, especially in the oil and gas and process industries, and the capacity expansion of existing plants have led to a growing demand for ball valves. Industries worldwide are upgrading their existing plants to increase production efficiency and reduce labor costs, which has led to the increased installation of such valves. Also, the availability of new and innovative quarter-turn valves has enabled end-users to carry out production more efficiently.”
Global needle valves market
Technavio predicts the global needle valves market to grow at a CAGR of 6.31% to reach USD 288.4 million by 2020.
The global needle valves market is seeing increased demand from the food and beverages and pharmaceutical industries. In these industries, needle valves are used for filtration purposes. The development of new products and the constant upgrading of existing lines will create demand for needle valves in these industries. “The presence of several food and beverages and pharmaceutical industries in APAC has contributed to the growth of the market in the region. APAC has the largest number of consumers of multi-turn valves,” adds Anju.
Global check and relief valves market
The global check and relief valves market was worth USD 221.3 million in 2015. Technavio predicts the market to reach USD 312.1 million by 2020.
The major end-users of check and relief valves are oil and gas production, petrochemicals, steel/primary metals, pulp and paper, marine, and food processing industries. Check and relief valves offer leak-free and secure connections and incur low cost. The increased adoption of these valves in many other end-user applications will drive the market. For instance, these valves are used extensively in medical facilities; they have their own special requirements such as reliability, safety, cleanliness, quiet operation, and need to replace components quickly is especially critical for life support systems. The valves that are used in medical facilities are medical gas ball valves, medical gas check valves, and vacuum and pressure relief valves for vacuum.
The top vendors highlighted by Technavio’s research analysts in this report are:
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