1) General purpose valve (general purpose valve): a general term for a wide range of valves, also known as ordinary valves. It is not a valve for a specific condition and a specific purpose. Although there is no clear definition of a universal valve, it mainly refers to a pressure below 2MPa, ...

Now the valve market is mixed, and illegal traders pretend to be innovative valves to be shoddy in order to make huge profits, which brings great safety hazards to the device project. Therefore, it is necessary to introduce to us the inspection of innovative valves. Now the valve market dealers mainly exist in the valve counterfeiting ...

1. Introduction to gate valves Gate valve refers to the valve in which the opening and closing parts (rams) move in the straight direction of the medium (channel axis) to complete the opening and closing. Among the various types of valves, gate valves are the most widely used one. Gate valves are mainly used as shut-off medium in pipelines, i.e. ...

Classified by role and use (1) Shut-off valve: The shut-off valve, also known as the closed-circuit valve, has the effect of turning on or cutting off the medium in the pipeline. Shut-off valves include gate valves, globe valves, plug valves, ball valves, butterfly valves and diaphragms. (2) Check valve: Check valve is also known as check valve or check valve.

1. Accounting for traffic Accounting for flow can also be determined by referring to the capabilities of fluid transfer machinery such as pumps and compressors. Sometimes, a combination of methods is used to determine. 2. Determination of the differential pressure (1) The two equipment with close distance between the front and back of the conditioning valve and the stable pressure are ...

The self-operated conditioning valve, also known as the self-operated control valve, relies on the pressure and temperature of the medium flowing through the valve as the energy source, and uses the reaction signal (pressure, pressure difference, temperature) at the output end of the valve to be transmitted to the actuator through the signal tube, and drives the valve disc to change the opening of the valve and reach the conditioning pressure.

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 corrosion of the valve is usually understood as the damage to the metal material of the valve under the chemical or electrochemical environmental effect. Because the corrosion phenomenon is presented in the spontaneous interaction between the metal and the surrounding environment, therefore, how to isolate the metal from the surrounding environment or more use non-...

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. According to the processing requirements, some parts need to be polished, and there can be no processing burrs on the appearance; 2. All parts are degreased; 3. After the degreasing is completed, pickling and passivation will be carried out, and the cleaning agent does not contain phosphorus; 4. Rinse with pure water after pickling and passivation.

(1) Check whether there is loosening in the multistage pump pipeline and joint. Turn the multistage pump by hand to see if the multistage pump is sensitive. (2) Lubricate the bearing oil in the bearing body, observe the oil level at the center line of the oil standard, and replace or replenish the lubricating oil in time. (3)、 ...

1. Glander type This is the form that is used a lot. The same form can be different in many details. For example, in terms of hold-down bolts, it can be divided into T-bolts (for low-pressure valves with a pressure of ≤ 16 kg/cm²), stud bolts and loose joints. From the gland point of view, it can be divided into integral and ...

First, there is a leak in the safety valve. The industry said that when there is a small leakage in the safety valve, it is generally not easy to find, but even a small leakage point will expand in the erosion. The test method is to test ...

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 ...

Valve is a device used by Gongliang to control the direction, pressure and flow of fluid in the fluid system. A valve is a device that allows the flow or suspension of the medium (liquid, gas, powder) in the piping and equipment, and can control its flow. The valve is a controlling part in the pipeline fluid delivery system, ...

1. What is a chemical centrifugal pump? Answer: It is a machine that adds liquid energy by increasing the effect of centrifugal force through the impeller to increase the mechanical energy of the liquid, so as to transport the liquid. 2. What are the characteristics of chemical centrifugal pumps? Answer...

(1) The dispatching valve belongs to the on-site dashboard, and the standard working temperature should be in the field of -25-60 °C, and the air humidity should be ≤ 95%. If it is installed outdoors or in a high-temperature place, moisture-proof and temperature-reducing measures should be used. In areas where there is an epicenter, it is necessary to eradicate the source of vibration or improve vibration isolation measures. ...

1. When the sealing surface is grinding, the grinding tools, abrasives, abrasive cloth and sandpaper and other objects should be selected in a reasonable grinding method, and the coloring inspection should be carried out after grinding, and the sealing surface should be free of indentations, cracks, scratches and other shortcomings; Second, the connection between the valve stem and the closure should meet the planning requirements, and the top center is not suitable.

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.

1. The valve core is pressure balanced, even if the large-diameter valve is under the high pressure drop parts, it can also be operated with a smaller actuator. 2. The inner cavity of the valve is straight-through streamlined, which greatly reduces the activity resistance. 3. The concentric movement method of the valve core and the valve body is greatly ...

Generally, the selection of control valve is mainly based on the nature of the medium, process parameters, use requirements, etc. 1. The properties of the medium should be clearly attributed to which of the following: (1) General fluids (2) High viscosity, fluids containing suspended solids, fibrous and other fluids (3) Toxic or high...