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Inspection Methods for Pneumatic Actuators (Part I)

Inspection Methods for Pneumatic Actuators (Part I)

Today, by Wuxi Xinming automatic control valve industry Co., Ltd. for you to introduce in detail the inspection method of pneumatic actuator (on): Pneumatic valves are now used more and more widely in various industries, and the technology of pneumatic actuators is getting better and better. The distance between domestic pneumatic actuators and imported pneumatic actuators is getting smaller and smaller, and there are more and more types. Introduce several inspection methods of pneumatic actuator for you: 1. Fix the pneumatic actuator on the calibration table, and separate and connect the air source, control the air source and displacement detection connecting rod; Adjust the calibration table accurately; 2. Mechanical zero calibration: input 4ma current signal (0%), control air signal should be 0.02mpa, and cylinder piston stroke should be zero at this moment; If it is not zero, the zero point can be adjusted by adjusting the nut on the zero adjustment screw (the zero point is higher than the nut); Repeated adjustment of zero point and range requirements; Zero point error should be ≤ 1%; 3. Mechanical full-scale calibration: input 20ma current signal (100), control air signal should be 0.10mpa, and cylinder piston stroke should be the upper limit value at this moment; If it is not the upper limit value, the range can be adjusted by adjusting the tightness of the range tension spring (the range is smaller than the loose tension spring, and the range is larger than the tight tension spring); Zero and range requirements are repeatedly adjusted; Full scale error ≤ 1%; 4. Positioning of the midpoint of the measuring range: After the zero point and the measuring range are aligned, input 12ma current signal (50%, 0.06mpa), and adjust the orientation of the connecting rod of the azimuth transmitter so that it is straight with the horizontal plane at this point; 5. Full stroke error calibration: input the control air signal 0.02mpa(0%), and then gradually add the input signal 0.036 mpa(20%), 0.052 mpa(20%), 0.068 mpa(60%), 0.084 mpa(80%), 0.1 mpa(100) to make the piston go through the full stroke, and all errors should be ≤ 1.5; 6. Non-linear error test: input the control air signal of 0.02mpa(0%), then gradually add the input signal until 0.10mpa(100), then reduce the signal to 0.02mpa(0%), make the actuator go through the full stroke, and record the stroke value corresponding to the signal pressure of 0.008mpa, and the nonlinear error between the actual pressure-stroke connection and the theoretical value shall be ≤ 1%;※ 7. Positive and negative stroke variation test: the same as the nonlinear error test method, the upper limit of the difference between the positive and negative stroke values of the cylinder piston under the same pressure value is ≤ 1% in the actual positive and negative pressure-stroke connection; The above is the above part of the inspection method of pneumatic actuator introduced in detail by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions about pneumatic actuator, please feel free to call for advice and wait for your cooperation.

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Inspection Methods for Pneumatic Actuators (Part II)

Inspection Methods for Pneumatic Actuators (Part II)

Today, Wuxi Xinming automatic control valve industry Co., Ltd. will introduce the inspection method of pneumatic actuator for you (below): Then explain the inspection method of pneumatic actuator in the previous period 8. Sensitivity test: add and reduce air pressure at the stroke of signal pressure 0.03, 0.06 and 0.09mpa respectively, and test the required signal pressure change value when the cylinder piston rod starts to move 0.1mm, with the upper limit of change being ≤ 0.2; 9. Sealing test of piston cylinder: Connect a pressure of 0.5 mpa to any air chamber of the cylinder, and then cut off the air source. Within 10 minutes, the pressure drop in the cylinder should not exceed 0.01mpa; 10. Electrical zero point detection of azimuth transmitter: open the azimuth cover and connect the wire; Input 12ma current signal (0.06 mpa), and adjust the circular eccentric wheel in the transmitter at this time to align the black line on the circular eccentric wheel with the white line on the circuit board; Then input 4ma current (0.02 mpa), and at this moment can adjust the zero potentiometer in the transmitter to make the output current 4ma; Electrical zero error should be ≤ 1%; 11. Electrical full-scale detection of azimuth transmitter: input 20ma current signal (0.1 mpa), and adjust the range potentiometer in the transmitter to make the output current 20ma at this moment; Electrical full-scale error should be ≤ 1%; 12. Full stroke error calibration of azimuth response current: input 4ma current (0%), and then gradually add input signal 8ma current (25%), 12ma current (50%), 16ma current (75%), 20ma current (100). Considering the nonlinear error of viewpoint change converted from linear displacement, 0%, 50%, 100 point response current errors should be ≤ 1%,25%, 75% point response current error should be ≤ 2%; 13, azimuth reaction current positive and negative stroke variation test: the same as the cylinder positive piston reverse stroke variation test method, the actual positive and negative azimuth reaction current-stroke connection, the same reaction current value of the cylinder piston positive and negative stroke value difference upper limit to 1%; 14, make good verification records, according to the contents of the verification record form item by item carefully fill in, inspection personnel need to sign; 15. After passing the above tests, the connection terminals in the azimuth transmitter shall be plugged in, the back cover shall be tightened, and then the air source inlet of the valve positioner shall be plugged with a plug. The above is all the contents of the inspection method for pneumatic actuators specifically introduced by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions about pneumatic actuators, please call us at any time and wait for your cooperation.

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07

What are the advantages of pneumatic actuators?

What are the advantages of pneumatic actuators?

Today, by Wuxi Xinming automatic control valve industry Co., Ltd. for you to introduce what are the advantages of pneumatic actuators? Let's talk about the advantages of pneumatic actuators before answering. What is an actuator? Valve actuators are automated mechanical devices that regulate the orientation of various types of valves. The actuator itself is a tissue that is driven by an external power source to produce a specific movement that manipulates the orientation of the valve. The motion of the actuator can be linear (horizontal or vertical motion) or rotational (rotation around a fixed axis). There are several different types of valve actuators. However, most actuators fall into two categories: electric actuators or pneumatic actuators. The primary difference between these two types of actuators is the primary driving force applied in their operation. Pneumatic actuator Pneumatic actuators use air (or other gas) pressure as the primary power to generate movement, and then operate the valve. In the most common pneumatic actuator, a diaphragm actuator pumps air into a hollow housing where the pressure that occurs acts on a flexible rubber diaphragm to cause it to violate its original orientation. The barrier attached to the valve stem moves up or down to condition the valve disc and manipulate fluid flow. Pneumatic actuators typically produce linear motion, but can also be used to produce rotary motion. Electric actuator On the other hand, electric actuators use electricity as the primary power to drive the actuator movement. Electric actuators are divided into two categories: electromagnetic actuators or motor-driven actuators. In a solenoid-driven actuator, current flows through a coil to generate a magnetic field that moves the metal valve stem to condition the orientation of the valve disc. The electric actuator uses a communication or DC powered servo motor to move the valve to the desired position. Electric actuators are capable of linear or rotary motion. The strengths and usefulness of pneumatic actuators Pneumatic actuators are capable of generating the largest closing forces of all actuator types. Some pneumatic actuators are rated for a maximum pressure of 250 psi and can generate a maximum force of 40,000 lb. With this actuator, a relatively fast closing speed of 2 m/s can also be reached. The speed and force of the actuator can be easily fine-tuned by a system of conditioning pressure relief valves or flow conditioners. Another primary advantage of pneumatic actuators is their low unit cost. Pneumatic cylinders are cheap and can be easily upgraded to larger diameters. Large air compressors are also very efficient and economical for powering large pneumatic equipment. These actuators are known for their clean operation, lack of ignition sources and high reliability, making them the aspiring choice for internal combustion engines, pumps, ventilation systems, and applications in flammable or flammable environments. The above is all about the advantages of pneumatic actuators specifically introduced by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions about pneumatic actuators, please feel free to call for advice and wait for your cooperation.

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Pneumatic ball valve than other valve class outstanding strengths

Pneumatic ball valve than other valve class outstanding strengths

Wuxi Xinming automatic control valve industry Co., Ltd. introduces the outstanding advantages of pneumatic ball valve over other valves Pneumatic ball valve and other types of valve comparison, angular stroke output torque, open agile, stable and reliable, widely applicable, there are the following advantages: 1. Reduce the friction torque of the thrust bearing stem, which can make the stem operate stably and sensitively for a long time. 2. Anti-static effect: a spring is set between the ball, the valve stem and the valve body, which can export the static electricity generated during the switching process. 3, because the PTFE and other materials have good self lubrication, and the ball friction loss is small, so the pneumatic ball valve has a long service life. 4, the fluid resistance is small: pneumatic ball valve is a small fluid resistance of all valve classification, even if the diameter of the pneumatic ball valve, the fluid resistance is quite small. 5, the valve stem seal: because the valve stem only for rolling movement, do not do lifting movement, the valve stem packing seal is not easy to damage, and the seal can follow the increase of medium pressure and become larger. 6, the valve seat sealing performance is good: the use of PTFE and other elastic materials produced by the sealing ring, the structure is easy to seal, and the valve seal of the pneumatic ball valve can follow the increase of the medium pressure and become larger. 7, the fluid resistance is small, the full diameter of the ball valve has no flow resistance. 8, simple structure, small size, light weight. 9, tight and firm. It has two sealing surfaces, and the ball valve sealing surface information widely used in a variety of plastics, good sealing, can complete the complete seal. It has also been widely used in vacuum systems. 10. Convenient operation, quick opening and closing, only need to rotate 90 ° from full opening to full closing, which is convenient for long-distance control. 11, convenient maintenance, ball valve structure is simple, the seal ring is generally active, disassemble and replace are more convenient. 12. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium. When the medium passes, it is impossible to cause corrosion of the valve sealing surface. 13, the scope of application is large, the diameter is as small as a few millimeters, as large as a few meters, high vacuum to high pressure can be used. 14, because the ball valve in the opening and closing process of scrubbing, so it can be used with suspended solid particles in the medium. 15, high processing precision, expensive cost, high temperature should not be used, such as impurities in the pipeline, easy to be blocked by impurities, resulting in the valve can not open. The above is Wuxi Xinming automatic control valve industry Co., Ltd. to introduce you to the pneumatic ball valve than other outstanding advantages of all the contents, if you have any questions, please feel free to consult.

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Pneumatic actuator manufacturers: What are the general types of actuators?

Pneumatic actuator manufacturers: What are the general types of actuators?

Pneumatic actuator manufacturer: Wuxi Xinming automatic control valve industry co., ltd. introduces you to several types of actuators? Actuators are generally divided into electric actuators and pneumatic actuators I. Electric Actuator Solenoid valve is a relatively simple electric actuator, it uses the electromagnet suction and release of small diameter valve for through, off two kinds of control, because the structure is simple, low price, often and two simple control device composed of simple active conditioning system. In addition to the solenoid valve, other successive actions of the electric actuator use the motor as a power element, the controller from the signal into the valve opening. The output mode of electric actuator has three types: straight stroke, angular stroke and multi-rotation, which can cooperate with linear moving conditioning valve, rotating butterfly valve, multi-rotation induction pressure regulator, etc. The signal from the controller drives the motor through the servo amplifier, drives the conditioning valve through the reducer, and feeds back the valve stem stroke to the servo amplifier through the position sensor to form a position follow-up system, relying on the negative feedback of the position to ensure that the input signal is accurately converted to the stroke of the valve stem. In the structure, the electric actuator can be integrated with the conditioning valve actuator, often separate sub-assembly to meet the needs of all aspects. In many process conditioning parameters, electric actuators can be used directly with a variety of electric conditioning appearances with different output signals. 2. pneumatic actuator Pneumatic actuator refers to the compressed air as the power of the actuator, it has a simple structure, large load capacity, fire and explosion-proof characteristics. Pneumatic actuators are mainly film type and piston type two categories, and the use of film actuators is relatively wide. The pneumatic piston actuator outputs thrust through the piston in the cylinder. Due to the large operating pressure of the cylinder, a relatively large thrust can be obtained, and a long-stroke actuator can be simply manufactured, so it is especially suitable for high static pressure, high pressure difference and demand Large thrust and displacement (corner or linear displacement) applications. Because pneumatic actuators require compressed air as power, they have a complete set of air source equipment more than electric actuators, and the use of installation and maintenance is more complicated, so they should not be used in buildings. The above is Wuxi Xinming automatic control valve industry Co., Ltd. introduced to you about the actuator generally has several types of all the contents, if you have any questions, please feel free to consult.

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The difference between pneumatic actuator, electric actuator and hydraulic actuator

The difference between pneumatic actuator, electric actuator and hydraulic actuator

Wuxi Xinming automatic control valve industry Co., Ltd. introduces the difference between pneumatic actuator, electric actuator and hydraulic actuator Pneumatic actuator, electric actuator, hydraulic actuator difference In the field of valve automation, the opening and closing of the valve will be used to the valve actuator, because it is more labor-saving and convenient, but also more quickly, and can complete the active control and remote control. But there are several varieties of valve actuator, each has its own advantages and disadvantages, so how to select the right valve actuator in the right place? At present, it is mainly divided into pneumatic actuators, electric actuators, hydraulic actuators, electro-hydraulic actuators, etc. The following describes the differences between these actuators. 1. pneumatic actuator The strengths of pneumatic actuators are: 1, the structure is relatively simple 2. The switching speed can be greatly improved 3, the gas compression is large, when closed, elastic 4, the acquisition of gas source is relatively easy. 5. After installing the governor, the switching speed can be adjusted according to their own needs Disadvantages are: 1. Because of the compressibility of gas, the speed is not easy to stick. 2, the structure is relatively large, so it is not suitable for large diameter high pressure valve 2. electric actuator The strengths of the electric actuator are: 1. Convenient installation 2. Protection and maintenance convenience 3, the volume can be completed ultra-miniaturization 4. Wide range of output torque 5, machinery can actively determine 6, strong applicability, not affected by ambient temperature 7, convenient control, can freely choose a variety of signals, suitable for amplification, recall, logic discrimination and calculation operations 3. hydraulic actuator The strengths of the hydraulic actuator are: 1. Simple structure, small volume 2, can output strength is large 3, due to hydraulic viscosity, can improve efficiency 4. Self-lubricating function and anti-rust function 5, can be long-distance active control 6. It can switch high speed and low speed to complete the speed change Disadvantages are: 1, piping, repair is not very convenient 2. Hydraulic components and pipelines are easy to leak 3. The change of viscosity caused by the change of oil temperature 4, not suitable for various operations on the signal According to the above, we can know that all kinds of valve actuators have their own advantages and disadvantages, but according to their own needs, they can still select suitable actuators. Through careful comparison, they will be able to find suitable valve actuators. The above is all about the differences between pneumatic actuators, electric actuators and hydraulic actuators introduced by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions, please feel free to consult

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What are the operating principles and basic components of pneumatic actuators?

What are the operating principles and basic components of pneumatic actuators?

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What are the useful features and operating principles of pneumatic valves?

What are the useful features and operating principles of pneumatic valves?

Wuxi Xinming automatic control valve industry co., ltd. and you describe the use of pneumatic valves, characteristics and operating principles are what? The use and characteristics of pneumatic valves 1. Usefulness: V-type AT100 pneumatic valve is a right-angle reversal structure. It is used in conjunction with valve positioning equipment to realize proportional conditioning; V-type valve core is suitable for various conditioning occasions, with large additional flow coefficient and adjustable ratio., Good sealing effect, zero-sensitivity conditioning function, small size, and vertical lying equipment. Suitable for manipulating gas, steam, liquid and other media. 2. Features: It is a right-angle reversal structure, which is composed of V-shaped valve body, pneumatic execution organization, positioning equipment and other accessories; There is an inherent flow characteristic of approximately equal to 100 percent. AT100 pneumatic valve adopts double bearing structure, small starting torque, good sensitivity and induction speed; Strong shearing ability. 3. Compressed air is selected as the power source for the execution organization of the pneumatic piston. The movement of the piston drives the crank arm to perform 90-degree reversal to make the valve active open and close. Its components are: conditioning bolts, executive organization box, crank arm, cylinder block, cylinder shaft, piston, connecting rod, universal shaft. 4. Operating principle: AT100 pneumatic valve is composed of executive organization and conditioning organization. The executive organization is the thrust component of the conditioning valve, which pushes the conditioning organization according to the size of the control signal pressure. The valve body is the conditioning component of the pneumatic conditioning valve, which directly touches the conditioning medium, and regulates the flow of the fluid. working principle of pneumatic valve: Pneumatic valves are driven by compressed air. The acquisition of only clear specifications, categories, pressure to meet the acquisition requirements of the practice, can be used to control the air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. Compressed air is used to propel the movement of multiple groups of combined pneumatic pistons in the actuator, and the characteristics of transmitting force to the cross beam and the inner curved track are used to drive the air-core main shaft to rotate. The compressed air disc is transmitted to each cylinder. The inlet and outlet directions are changed to change the rotation direction of the main shaft. According to the requirements of the rotation torque required by the load (AT pneumatic valve), the number of cylinder combinations can be adjusted to drive the load operation. The two-position five-way solenoid valve is generally used in conjunction with the double-effect pneumatic execution organization. The two-position solenoid valve is controllable in two directions: on-off, and the five-way solenoid valve has five channels for ventilation, one of which is connected with the air source, two are connected with the air inlet and outlet of the external air chamber of the double-effect cylinder, and two are continuous with the air inlet and outlet of the internal air chamber. The specific operation principle can refer to the double-effect pneumatic execution organization. AT pneumatic valve because of the increasing number of ways and means of control, in the actual industrial production and industrial control, used to control the pneumatic execution of the organization is also a lot of methods. Suppose you want to know more knowledge, you can browse the company's website, we will provide you with more professional information!

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