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...
Selection of pressure reducing valve ① The fluctuation of the inlet pressure of the pressure reducing valve should be controlled within 80%~105% of the given value of the inlet pressure. If it exceeds this range, the performance of the pressure reducing valve will be affected. ② Each gear spring of the pressure reducing valve is only suitable for a certain outlet pressure range, and the spring should be replaced if it exceeds the range. Within a given range of spring pressure levels, the outlet pressure can be continuously adjusted between the maximum value and the minimum value without jamming and abnormal vibration. ③ In the occasions where the working temperature of the medium is relatively high, the pilot piston pressure reducing valve or the pilot bellows pressure reducing valve is generally used. ④ When the medium is air or water (liquid), it is generally advisable to use a direct-acting membrane pressure reducing valve or a pilot-operated membrane pressure reducing valve. ⑤ The bellows direct-acting pressure reducing valve is suitable for steam media with low pressure and small and medium diameters, and the film direct-acting pressure reducing valve is suitable for air and water media with medium and low pressure and...
What is a rubber joint? Rubber joints can also be called: flexible rubber joints, rubber soft connections, soft joints, flexible rubber joints, and rubber expansion joints. They are pipe connections with high elasticity, high air tightness, medium resistance, and weather resistance. There are three types: loose sleeve flange type, fixed flange type, and threaded type; the structure includes single sphere, double sphere, different diameter body, etc. The rubber joint is generally composed of the inner rubber layer, fabric reinforcement layer (the reinforcement layer has multi-layer scraped nylon cord fabric), middle rubber layer, outer rubber layer, end reinforced metal ring or steel traveler, after high temperature and high-pressure vulcanization molding, and Composite rubber pipe composed of metal flange or loose sleeve of the parallel joint. This product utilizes the advantages of the high elasticity, high gas, medium resistance, weather resistance, and radiation resistance of rubber, which can reduce the vibration and noise of the pipeline, and can compensate for thermal expansion and contraction. According to different media, the rubber materials used are also different, such as natural rubber, styrene-butadiene rubber, butyl rubber, nitrile rubber, EPDM rubber, neoprene rubber, silicone rubber, fluorine rubber, and so on. Respectively have heat resistance, acid resistance,...
How to select the Solenoid valve and what should be paid attention to in the installation working principle: 1. Direct-acting solenoid valve Principle: When the normally closed direct-acting solenoid valve is energized, the electromagnetic coil generates electromagnetic suction to lift the valve core, so that the seal on the valve core leaves the valve seat, and the valve opens; The seal on the core presses against the seat opening and the valve closes. (Normal open type is opposite to this) Features: It can work normally under vacuum, negative pressure, and zero pressure difference. The larger the valve diameter, the larger the volume and power of the solenoid head. 2. Step-by-step direct-acting solenoid valve (recoil type) Principle: Its principle is a combination of direct action and pilot. When the power is turned on, the solenoid valve first opens the auxiliary valve, and the pressure in the lower cavity of the main valve is greater than the pressure in the upper cavity, and the valve is opened by using the simultaneous action of pressure difference and electromagnetic force; When electrified, the auxiliary valve uses spring force or medium pressure to push the closing seal and move down to close the valve port. Features:...
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