You may also choose from a variety of materials, seat design and end-connection. They are used in specific applications that require extreme resistance to fluid impact and high and low temperatures. The high-performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). Rotary valves constitute a derivation of the general butterfly valves and are used mainly in powder processing industries. Generally speaking, butterfly valves are advantageous in terms of weight, cost and space. The zero-offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. Nickel alloy butterfly valves are one of the strongest and most versatile types of valve. Carbon steel is a combination of carbon alloy and iron. It can be through a packing from a pneumatic actuator, an electric motor, a solenoid or a hydraulic piston and cylinder. Cannot be used in conjunction with corrosion resistant piping applications. For carbon steel butterfly valves, the most popular grade for body material and disc is the WCB and LCC Steels. Butterfly valves are generally favored because they cost less than other valve designs, and are lighter weight so they need less support. IE9 and older versions are not supported. Manually operated valves are used in the old times and where areas doesn’t have power for valve operation. Huamei offers this type of valve in wafer and lug. Also, they can withstand high temperatures than stainless steel. It ís so common that no one even bothers to use the word "wafer" when ordering a butterfly valve. [2] The valves used in these industries are usually manufactured according to cGMP guidelines (current good manufacturing practise). Types of Butterfly Valves Based on Body Construction Wafer Types. In this guide, we will run through some basic features and know-hows of the butterfly valves before we dive right in to its different types. What are the International Standards for Choosing Butterfly Valve Types? There are different kinds of butterfly valves, each adapted for different pressures and different usage. Garlock does not offer rubber or metal valves, so our main focus will be on plastic-lined valves; however, a lot of the main concepts apply to all 3 types. A butterfly valve is used to shut off or modulate the flow of a fluid (isolation and regulation). Handling temperature ranges from -100°F to +450°F. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. But when it is in the rotation, the pockets allow dropping a defined amount of solids,[1] which makes the valve suitable for dosing bulk product by gravity. So, it would depend on the application of the butterfly valve when you choose between inconel and stainless steel. A lugged valve has the ability to maintain a reliable body connection even without a downstream flange. A butterfly valve is from a family of valves called quarter-turn valves. Plus, they are more suitable for handling large industrial valve applications as compared with globe, gate, plug and ball valves. Chances are there that you already know this. The stem is mounted in a vertical axis at the center of the disk. The movement is calculated with a specific cone profile to address shut off of high pressure applications. This may be dependent on the amount of torque needed to open and close the valve or the speed at which it must operate. James Watt used a butterfly valve in his steam engine prototypes. The maximum pressure in your system should be lower than the rated maximum temperature and pressure of the valve. When the valve is closed, the disc is turned so that it completely blocks off the passageway. [3] In 1969 James E. Hemphill patented an improvement to the butterfly valve, reducing the hydrodynamic torque needed to change the output of the valve. This is true especially when it’s function is to handle large amounts of liquids or gases at low pressure differentials, such as in a hydroelectric power plant MIV system. When the system detects that its about to exceed the air pressure, a diaphragm modulates the opening and closing amount of the butterfly valve. This setup permits either side of the piping system to be disconnected without disturbing the other side. Also, the wetted parts should be compatible and in contact with the fluid being measured. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc. An individual hole allows installation of two sets of bolts without a nut. [4], Learn how and when to remove this template message, "Pneumatic Rotary Valves - Rotary Valves pneumatically actuated - PowderProcess.net", "Valve Types: Butterfly Valves and Ball Valves | Blog - La Fox, Illinois-BI-TORQ Valve Automation", https://en.wikipedia.org/w/index.php?title=Butterfly_valve&oldid=966911764, Articles needing additional references from December 2007, All articles needing additional references, Creative Commons Attribution-ShareAlike License.

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