Maintenance and maintenance of multistage pumps

　　Selection: The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. The butterfly valve has a simple structure, small size, light weight, only a few parts, and only needs to rotate 90° to quickly open and close, the operation is simple, and the ...

Valve application requirements (1) General gate valves, ball valves, and globe valves are prohibited from regulating according to their structural characteristics. However, in process design, it is commonly used for mediation. Due to the conditioning application, the valve seal has been in a saving state for a long time, and the impurities in the oil have washed the seal, damaging the seal.

Gate valves have the following advantages: Low fluid resistance: the medium channel inside the valve body is straight, and the medium does not change its direction of activity when it flows through the gate valve. The torque required for opening and closing is small; It can be used on a ring network pipeline where the medium moves in both directions, that is, the flow direction of the medium is not ...

The actuator of the control valve has pneumatic type, electric type and electro-hydraulic linkage type, and the pneumatic equipment is divided into barrier type and cylinder type. Depending on the action when the operating signal and the drive source disappear, the actuator has a forward type, a reverse type, a non-directional type, and a persistent type. The positive type is used in the operation signal and drive ...

Pneumatic control valve is one of the instruments widely used in petrochemical enterprises. It is of great significance to ensure the normal operation and safe production of the process equipment by operating accurately and normally. Therefore, it is necessary to strengthen the maintenance of pneumatic control valves. First, the key points to check the location during maintenance ...

1. Confirm the selection criteria (1) Process fluid conditions: fluid name, flow rate, inlet and outlet pressure, pressure difference during normal operation, pressure difference when valve is closed, fluid temperature, specific gravity, viscosity, whether there are suspended solids, fibrous, muddy, etc. Sometimes it is possible to part with the most ...

(1) Selection process (1) Clarify the purpose of the valve in the equipment or equipment, and confirm the operating conditions of the valve: applicable medium, operating pressure, operating temperature, etc. (2) Confirm the nominal diameter and connection method of the pipeline connected to the valve: flange, thread, welding, etc. ...

In the field of industrial automation process control, the conditioning valve, also known as the control valve, is the final control element that changes the process parameters such as medium flow, pressure, temperature, and wave level by means of dynamic operation by bearing the control signal output by the conditioning control unit. It is generally composed of a drive actuator and a valve ...

Pneumatic butterfly valve additional code: BD insulation butterfly valve, SD telescopic butterfly valve, TLD desulfurization butterfly valve, DH check butterfly valve, DKS fast butterfly valve, FDBD square louver butterfly valve; Butterfly valve code: D indicates butterfly valve Transmission code: manual ...

1. Corrosion of valves is usually understood as the damage to the metal materials of valves under chemical or electrochemical environmental effects. Because the corrosion phenomenon occurs in the spontaneous interaction between the metal and the surrounding environment, therefore, how to block the metal from the surrounding environment or more use of 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.

The selection of control valve is a very complex thing, in order to ensure the use of control valves, customers only need to provide process parameters and use requirements to valve manufacturers, because valve manufacturers have rich experience in valve use, so they can provide customers with the best cost-effective valve products. ...

The process of shell experiments and seal experiments done by turbine fixed ball valves in some artificial environments is as follows. 1. The double blocking and discharge function of the turbine fixed ball valve: the turbine ball valve is fixed by using the tension spring preload floating valve seat, when the valve is in two different states of full open and fully closed, the flow ...

The self-operated control valve, also known as the self-operated control valve, is based on the pressure and temperature of the medium flowing through the valve itself as an 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 then drives the valve disc and then changes the opening of the valve to achieve the adjustment pressure.

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, ...

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.

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.

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...

The biggest difference between the electric single-seat conditioning valve and the electric sleeve conditioning valve lies in the performance and application, but both have their own advantages and shortcomings, and the advantages of one may be the lack of the other, which can complement each other and be used in different occasions. There is no difference in appearance, first of all, the two ...

1. The hydraulic power in the hydraulic ball valve should refer to the opening mode of the valve as hydraulic, which refers to the valve opening device. The latter ball valve refers to the valve type as a valve type and a shut-off valve class. Two: Type Q61N can explain Q as ...