The self-operated control valve is different from that without a commander

The conditioning valve, also known as the control valve, is a device that uses power operation to change the process parameters such as the flow, pressure, temperature, and liquid level of the conditioning pipeline medium in the field of industrial automation process control. It is mainly composed of the operating fulfillment mechanism and the regulating valve body, which receives relevant signals and changes the opening of the valve.

1. Leakage of stuffing box This is the primary aspect of running, running, dripping and leaking, which is often seen in the factory. There are several reasons why stuffing box leaks occur: (1) The corrosiveness, temperature and pressure of the filler and the working medium are not suitable; (2) The filling method is wrong, especially the whole filler ...

Valve application requirements (1) General gate valves, ball valves, and globe valves are prohibited from dispatching according to their structural characteristics. However, in process design, it is widely used for mediation. Because of the scheduling application, the valve seal has been in a throttling state for a long time, and the impurities in the oil have washed the seal, endangering the seal.

1. The sealing surface is uneven and cannot constitute a sealing line: 2. The connection between the valve stem and the closure is suspended, irregular or worn; 3. The valve stem is tortuous or the assembly is not correct, so that the closure is skewed or mismatched: Fourth, the sealing surface raw materials are not selected properly or not according to the working conditions.

Check valve, also known as check valve, check valve, is a valve used to avoid the backflow of medium in the pipeline, belongs to a class of active valves, because the pump in the abort operation, the medium will flow backwards, if there is no device check valve at this moment, the water hammer effect will occur in the process of backflow, the pipeline ...

　　First, the effect of pipeline identification Why do you need to do pipeline identification? Intent: To facilitate the identification of substances in industrial pipelines, ensure safe production, and avoid misjudgment in operation and equipment maintenance. Carry out ...

There are two main reasons for the leakage of cryogenic valves, one is internal leakage; The second is leakage. 1) Internal leakage of the valve The main reason is the deformation of the sealing pair at low temperature. When the temperature of the medium drops to the point where the data undergoes a phase change, the volume changes ...

1. Torque maintenance refusal To measure the output torque of the electric actuator, there are mainly mechanical maintenance switches, motor current and voltage power measurement and calculation torque, and sensor-type maintenance devices: mechanical torque maintenance switches were used more before 2000 and were classified as a transitional product.

1. The valve positioner is divided into pneumatic valve positioner, electrical valve positioner and intelligent valve positioner according to the input signal. (1) The input signal of the pneumatic valve positioner is a standardized gas signal, for example, the 20-100kPa gas signal, and its output signal is also a standardized gas signal. （ ...

Classification of valves, types of structures, functional applications, pressure levels, temperature classifications, valve body data classifications, and general classifications The types of valve products are complex, and the statements are inconsistent, some are divided according to the use (such as chemical valves, oil valves, oilfield valves, power station valves, etc.), and some are according to the medium.

1. Why does the double-seat valve vibrate briefly during small opening operation For a single core, when the medium is a flow-open type, the valve has good stability; When the medium is a flow-closed type, the stability of the valve is poor. The double-seat valve has two spools, the lower spool is in the flow closed and the upper spool is in the flow open, so that in the small opening ...

1. In the case of interlocking action of pneumatic valve equipment, the valve orientation should have the following situations: The EC air supply is discarded and the valve is in a closed position FO__ air source is discarded, and the valve is in the opening position FL-_ The air source is lost, and the valve is in the time position and has been insisting FL ...

(1) Thread damage due to excessive operation; (2) lack of lubrication or lubricant failure; (3) Stem bending and torsion; (4) The surface finish is not good; (5) Cooperative public service is forbidden and bites too tightly; (6) The stem nut is skewed; (7) Improper selection of information, such as valve stem and ...

Product features of pneumatic conditioning stainless steel butterfly valves: 1. Simple, small size, light weight, small flow resistance, large flow coefficient and good sealing performance. Large conditioning range. It is the fulfillment unit of the instrument in the automatic control system. 2、 ...

In all kinds of mechanical connectors, the anti-loosening of bolts is a very important link. So can the tension spring washer be loosened? The principle of anti-loosening of the tension spring washer The anti-loosening principle of the tension spring washer is that after flattening the tension spring washer, the tension spring ...

1. Smooth mechanism Smoothing is to add a smoothing agent between the two conflict surfaces of relative motion, so that a smooth film is formed between the two conflict surfaces, and the dry conflict appearance that is originally directly touched is separated, and the dry conflict is a conflict between the smooth agent molecules, so as to reduce the conflict and reduce wear, ...

1. The signal valve pushed by the control box does not move. Under the condition that the positioner is installed, the pneumatically adjustable butterfly valve is equipped with a solenoid valve. The weak current of the solenoid valve affects the information output of the control box, and the valve cannot withstand the data signal and cannot work normally. ...

Valve is a kind of commonly used hardware products, the valve also has certain technical requirements before assembling and in the process of the device, otherwise the assembled valve may not reflect its own excellent function, what are the technical requirements of the valve in the assembly process? ...

The process of shell experiments and seal experiments done by turbine fixed ball valves in some artificial environments is as follows. Double blocking and discharge function of turbine fixed ball valve: the turbine ball valve is fixed by using tension spring preload float valve seat, when the valve is in two different states, full open and fully closed, the fluid is ...

Double-seat cast ball angle valve The nominal diameter is 40-200 mm Nominal pressure ANSI 125, 150, 300, 600JIS10, 16, 20, 30, 40K PN1.6, 4.0, 6.4MPa Connection type Flange...