The electric or pneumatic multistage labyrinth regulating valve adopts the labyrinth flow channel regulating valve composed of multistage axial flow pressure sleeve, full control of the flow through the medium in the valve, a significant reduction of high-pressure gas or steam in the valve generated noise, stable multi-level step-down effectively so that the liquid will not produce cavitation,      

Is the use of high-pressure media in the stable performance of the control valve, can choose more than spring pneumatic book membrane mechanism or electric actuator. The Labyrinth control valve consists of a cylindrical disc with a maze of labyrinth paths distributed along the same axis surface. According to the different technological parameters of the media, the design of different labyrinth maze and the number of laminated layers constitute the valve cage, valve cage will be the total flow path into a number of small circuitous or even step-like distribution of throttling flow, forcing the fluid to constantly change the flow and flow area gradually reduce the pressure of the fluid in order to prevent the occurrence of flash evaporation, prolong the service life of the valve parts. With balanced sleeve spool, the tight combination of spool and seat ensures very low leakage. This kind of valve inner part is suitable for each kind of easy to produce the blockage flow to cause the cavitation the work condition. The famous imported high-pressure control valve brand United States shield Vton labyrinth control valve For example, generally used in high-temperature and high-pressure steam, as well as water supply occasions. High temperature and high pressure import control valve is widely used in power plant, metallurgy, petrochemical and many other industries, high-temperature high-pressure control valve cavitation, noise and vibration problems, has been a difficult task to solve.

The Labyrinth control valve utilizes the mature technology, has successfully solved the common controls valve to encounter such as the cavitation, the high noise, the vibration and so on, has been applied in the power plant boiler to reduce the warm water, the feedwater pump minimum flow control as well as other flow regulation. Labyrinth Control valve can be designed specifically for the different requirements of the user, through the flow of the medium to eliminate cavitation, noise, corrosion and vibration problems. Labyrinth control Valve in the structure of the design into a quick disassembly, easy maintenance, can be very convenient to replace the spool, in the flow characteristics of the use of case design, thus providing more accurate flow controls, with rigorous closure characteristics.

The power plant adopts labyrinth control valve, which can ensure safe and stable operation, improve efficiency and prolong maintenance cycle. For ordinary single-stage buck valves, when the medium enters the pressure is P1, the flow rate is v1. When the media flow to the spool part, because the valve spool and the throttle role of the seat, resulting in necking phenomenon, so the flow rate will quickly increase to V2, and the pressure is rapidly reduced to P2, and often less than the saturated vapor pressure of the media PV. In this case, the medium is vaporized to form a bubble. When the media flow through the spool and the valve seat formed by the necking, due to the change of the channel, the conditions have changed, pressure, the kinetic energy conversion to potential energy, at this time the pressure back to P3, speed back to V3. When the pressure exceeds the saturated vaporization pressure of the medium PV, the bubble that has just formed will rupture, resulting in strong local pressure. The huge energy of bubble rupture can cause serious damage to throttle element such as valve core and valve seat in a moment, and form the so-called cavitation phenomenon. Cavitation is bound to cause damage to the valve, resulting in leakage, a serious noise and caused the vibration of the valve inside, thus affecting the security and efficiency of the entire system.