The principle of pneumatic control valve of dynamic balance is?

Dynamic balance of electric pneumatic control valve is used for regulating the flow of medium, pressure and liquid level. According to adjust the position signal, automatic control valve opening, so as to achieve the adjustment of the medium flow rate, pressure and liquid level. Dynamic balance of electric pneumatic - valve consists of electric actuators or pneumatic actuators, and pneumatic - valve in two parts. Adjustment is usually divided into direct single seat type and direct two-seater type two kinds, the latter has a large flow capacity, small unbalanced force and the characteristics of stable operation, so often especially suitable for large flow, little pressure drop and leakage. Valve is the control unit in fluid conveying system, with a cut-off, regulation, guide, to prevent the reverse flow, voltage regulator, the leakage of the shunt or overflow, and other functions. Used for fluid flow control system of the valve, from the most simple cut-off valve to extremely complex automatic control system used in all kinds of valves, its quite a wide varieties and specifications. The valve can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium, etc. All types of fluid flow. The valve nominal menstruation from instrument type needle valve a few mm to 10 m industrial pipe with a valve. Working pressure can be from 1 of the valve. 3× Ultra-high pressure of 10-3 mpa to 1000 mpa. Working temperature from 269 ℃ ultra-low temperature to 1430 ℃ high temperature. Opening and closing of the valve can be used a variety of control mode, such as manual, pneumatic, electric, hydraulic, electric - - gas or electricity Hydraulic linkage and electromagnetic driver, etc. ; Can also be used in pressure, temperature or other form under the action of sensor signals, action according to the requirement of the reservation, or only for simple open or closed. Nominal pressure or pressure, PN1. 0 - 32. 150 - 0 mpa, ANSI类 1500LB、JIS10- 20 k or nominal diameter diameter: DN10 ~ 500, NPS 1/2 ~ 36 'connection mode: flange, butt welding, thread and other applicable temperature: - 196 ℃ ~ 700 ℃ drive mode: manual, bevel gear drive, pneumatic, electric, hydraulic, pneumatic hydraulic linkage, electro-hydraulic linkage: body material WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). 、CF3( 304L) 、CF8M( 316). 、CF3M( 316 l) 、Ti。 Choose different material, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media. This valve shall generally be installed in the pipeline.