Introduction: Butterfly valves appear to be simple devices that are easy to use, but they have a wide range of applications in the industrial world. They are used for controlling the flow of liquids and gases through pipes, reducing pressure, and creating back-pressure situations. They come in many shapes and sizes and can be found almost anywhere there is an industrial facility or manufacturing plant. Butterfly valves last anywhere from ten years to over one hundred years depending on how they are maintained, what type they are made of and how often they get used. If butterfly valves are constantly being opened and closed, then it is possible that they could break within less than ten years. However, if they aren’t being used as much or properly maintained then their life span could increase substantially without any problems experienced during this period. It varies. It’s hard to say how long a butterfly valve will last for you because it depends on what you’re using the valve for. A butterfly valve is used in many industries and is used differently depending on which industry it’s being used in. For example, if you’re using a butterfly valve to control water flow through...
What types of check valves are available? Introduction There are many different types of check valves available for a variety of applications. They all have unique features that make them ideal for specific applications. The following are the various types of valves. 1. Lift Check Valve A lift check valve belongs to a kind of automatic valve, its structure is generally composed of the valve body, valve cover, valve flap, sealing device, etc. Its main role is to prevent the backflow of media, prevent the pump and drive motor reversal, as well as release container media. Lifting check valve flap with the guide rod, the guide rod can be freely lifted in the valve cover guide hole. When the pipeline medium is in accordance with the specified direction (from left to right), the pressure below the valve flap exceeds the pressure above it, push the valve flap along the center line of the valve cover guide hole up, and the valve automatically open, so that the medium flow. If the fluid flows from right to left, that is, reverse inflow, the pressure above the valve flap is greater than the pressure below it, and the pressure difference...
What is a metal rotameter? Metal Tube Rotameter Metal rotameter is the most commonly used flowmeter in industry and laboratory. The rotameter is suitable for measuring the small flow through the pipe diameter D<150mm, and it can also measure the flow of corrosive media. When in use, the flowmeter must be installed on a vertical pipe section, and the fluid medium passes through the rotameter from bottom to top. The metal rotameter consists of two parts. One part of the rotameter is a tapered tube that gradually expands from bottom to top; the other part of the rotameter is placed in the tapered tube and can move freely up and down along the center line of the tube. rotor. When the rotameter measures the flow of the fluid, the measured fluid flows in from the lower end of the tapered tube, and the flow of the fluid impacts the rotor and generates a force on it (the magnitude of this force varies with the flow); when the flow is large enough, the resulting force lifts the rotor up and lifts it up. At the same time, the measured fluid flows through the annular section between the rotor and the tapered tube wall...
Analysis of the vibration cause of the regulating valve The vibration and noise of the regulating valve can be roughly divided into mechanical vibration, cavitation vibration, fluid dynamic vibration, and so on. Mechanical vibration: Mechanical vibration can be divided into two states according to their manifestation. One state is the overall vibration of the regulating valve, that is, the whole regulating valve in the pipe or the base frequently fibrillation, the reason is due to the violent vibration of the pipe or the base, causing the vibration of the whole regulating valve. In addition, it is related to the frequency, that is, the energy of the external forced vibration reaches the maximum value when the external frequency is equal to or close to the natural frequency of the system. Another state is the vibration of the regulating valve disc, the reason is mainly due to the sharp increase of the medium flow rate, so that the differential pressure before and after the regulating valve changes sharply, causing the whole regulator to produce serious oscillation. Eclipse vibration: Most gas corrosion vibration occurs in the regulating valve of the liquid medium. The root cause of cavitation is the acceleration of fluid shrinkage...
What is a 100X float valve? What is it? 100X Diaphragm Remote Control Float Valve is a hydraulically operated valve with multiple functions. To be installed at the water inlet of a pool or an elevated water tower. The liquid level control is precise and free from water pressure interference; the 100X diaphragm-type remote control float valve can be installed at any position according to the height of the water pool and the use space. It is convenient for maintenance, debugging, and inspection, reliable in sealing, and long in service life. Diaphragm valves are reliable. High strength and flexible action are suitable for pipes with a caliber below 450MM. Piston type is recommended for diameters above DN500MM. How does it work? When the pipeline feeds water from the water inlet, since the needle valve, ball valve, and float valve are normally open, the water enters the pool through the micro-filter, needle valve, control room, ball valve, and float valve. At this time, the control room does not form pressure, the main valve is opened, and the water tower (pool) supplies water. When the water surface of the water tower (pool) rises to the set height, the floating ball floats to...
Wafer Check Valve Wafer check valve refers to a valve in which the opening and closing parts are circular discs and rely on their own weight and medium pressure to generate actions to block the backflow of the medium. It is an automatic valve, also known as check valve, one-way valve, return valve or isolation valve. The disc movement mode is divided into lift type and swing type. The lift check valve is similar in structure to the globe valve, except that it lacks the valve stem to drive the disc. The medium flows in from the inlet port (lower side) and flows out from the outlet port (upper side). When the inlet pressure is greater than the sum of disc weight and its flow resistance, the valve is opened. Conversely, the valve is closed when the medium flows backwards. The swing check valve has an oblique disc that can rotate around the axis, and its working principle is similar to that of the lift check valve. The check valve is often used as the bottom valve of the pumping device to prevent the backflow of water. The combination of check valve and globe valve can play the role of...
Is a throttle valve a control valve? Throttle valve A valve that adjusts flow and pressure by changing the cross-sectional area of the passage through the disc is called a throttle valve. (1) According to the structural form, the throttle valve can be divided into: straight-through globe valve, angle-type globe valve, straight-through cock type, and straight-through butterfly type. (2) The use and characteristics of the throttle valve The throttle valve is used to adjust the flow and pressure of the medium, and the cut-off throttle valve is used for small-diameter valves, and its adjustment range is large and accurate. The cock type is suitable for medium and small diameters, and the butterfly type is suitable for large diameters. In recent years, large-diameter (DN500) cut-off throttle valves have also appeared, which are mainly used in ash and slag water discharge pipelines. The throttle valve should not be used as a shut-off valve. Because the disc is used for throttling for a long time, the sealing surface is easily eroded, which affects the sealing performance. Most of the throttle valves in our country adopt the cut-off type, the nominal size is DN3~200, the nominal pressure is not greater than PN320, and the...
What is Positive Displacement Flow Meter? Positive displacement flow meter type Common velvet flowmeters have three types: gear type, scraper type and rotary piston type. 1. Gear Type Positive Flow Meter The casing of this flowmeter is equipped with two rotors, which mesh with each other directly or indirectly, and rotate under the action of the pressure difference between the inlet and outlet of the flowmeter. Through the rotation of the gear, the fluid filled in the “metering space” between the gear and the housing is continuously discharged. By measuring the number of gear rotations, the amount of fluid passing through the flowmeter can be obtained. 2. Waist wheel volume flowmeter, also known as Roots type volume flowmeter. Relying on the fluid pressure difference between the inlet and outlet to generate motion, four parts of the fluid volume of the “metering space” are discharged per revolution. The difference is that there are no teeth on the waist wheel, they are not directly engaged with each other to rotate, but are driven by a transmission gear set installed outside the casing. The volumetric flowmeters of the above two rotor types can be used for the measurement of various liquid flows, especially...
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