The parameters of the pneumatic valve

The parameters of the pneumatic valve definition believe everyone has heard of pneumatic valve! Do you know what pneumatic valve performance? Pneumatic valve is the use of compressed air drive actuator of the combined group in pneumatic piston movement and force to beam and the characteristics of the curve track, drive tubular spindle rotation, compressed air disks to each cylinder, changed the direction of gas in and out of position to change the direction of spindle rotation, according to the load ( Valve) The requirements of rotary torque required, can adjust the cylinder number combination, driving load ( Valve) Work. Two five-way solenoid valve which is equipped with double-acting pneumatic actuators, two is two position control: open - , five are five tunnel ventilation, which connected with gas source, two external and double-acting cylinder chamber in and out of the port connection, two with the internal chamber in and out of the port in succession, you may refer to the working principle of concrete working principle of the double-acting pneumatic actuators. Because more and more control mode and means, in the actual industrial raw and industrial control, often used to control method has a lot of pneumatic actuators. 。 Nominal size: ( 公称直径) , also known as the average diameter ( 平均外径) , said sign DN, it is general diameter of various kinds of pipe and pipe accessories. The same nominal diameter of the pipe and pipeline fittings can connect each other, are interchangeable. It is not on the actual meaning of pipe diameter or inner diameter, although its value with the pipe diameter is relatively close to or equal to, in order to make the pipe, tube connection dimension is unified, in nominal diameter ( Also known as nominal diameter and nominal diameter) 。 For example, welded steel pipe can be divided by the thickness of the thin wall steel tube, ordinary steel pipe and increasing pipe. Its nominal diameter rather than outside diameter, diameter, but the approximate ordinary steel pipe inner diameter of a nominal size. Each nominal diameter, corresponds to a diameter, its inner value varies with the thickness. Nominal diameter available metric mm said, also can use English in said. Piping accessories also expressed in nominal diameter, meaning is the same tube. 。 Nominal pressure: 公称压力) , said symbol PN, under a certain temperature applications allow maximum working pressure. Control valve for carbon steel body, refers to ℃ maximum allowable working pressure when the following application; For cast iron valve body, the point at which the ℃ below application maximum allowable working pressure; Control valve of pneumatic valve refers to ℃ maximum allowable working pressure when the following application. When working temperature, the body pressure is reduced. For example, nominal pressure is. MPa（ PN） Carbon steel valves for ℃ when the pressure is. Pressure for of MPa, when using ℃. Pressure for of MPa, when used in ℃. MPa。 Control valve, therefore, the determination of nominal pressure not only according to the maximum working pressure, still need according to the maximum operating temperature and material characteristics, not only meet the nominal pressure is greater than the pressure of work. Performance test of pneumatic valve, pneumatic valve, a specification batch manufacturing, should be authoritative institutions entrusted to test the performance of the following: (1) the valve open-close torque under working pressure conditions; (2) under working pressure conditions, to make sure that the continuous opening and closing the valve closed tight times; (3) the flow resistance coefficient of valve in the pipeline condition detection. , valves should be done before they go out the following tests: (1) the valve under open conditions, the body should be 2 times the internal pressure of valve working pressure value detection; On both sides of (2) the closing of the valve, respectively. Times the valve pressure value, no leakage; But the metal seal valve, leakage nor a value greater than the related requirement.