The regulating valve, also known as a control valve, changes the fluid flow by means of power operation by receiving a control signal output from the adjustment control unit. Regulators generally consist of actuators and valves. According to the power used by the actuators it is equipped with, the regulating valve can be divided into three types: pneumatic regulating valve, electric regulating valve, and hydraulic moving regulating valve, that is, a pneumatic regulating valve using compressed air as a power source, and an electric power source as the electric source. Regulating valve, electro-hydraulic regulating valve powered by liquid medium (such as oil, etc.) pressure, in addition, according to its function and characteristics, as well as hydraulic control valve, solenoid valve, electronic, intelligent, fieldbus type control valve Wait.
Valve body type selection
The valve body of the regulating valve is of many types. The commonly used types of valve body include a straight single seat, a straight through seat, an angle shape, a diaphragm, a small flow, a three-way, an eccentric rotation, a butterfly shape, a sleeve type, and a spherical shape. When making specific choices, consider the following:
(1) The valve core shape structure is mainly based on selected flow characteristics and unbalanced forces.
(2) Wear resistance When the fluid medium is a suspension containing a high concentration of abrasive particles, the internal material of the valve is hard.
(3) Corrosion resistance Due to the corrosive nature of the medium, try to choose a simple structure valve.
(4) Temperature and pressure of the medium When the temperature and pressure of the medium are high and the change is large, the valve whose valve core and valve seat materials are subject to changes in temperature and pressure should be used.
(5) Preventing flashing and cavitation Flashing and cavitation are only produced in liquid media. In the actual production process, flashing and cavitation will form vibration and noise, shortening the service life of the valve. Therefore, in selecting the valve, the valve should be prevented from flashing and cavitation.
Regulator actuator selection
In order for the regulating valve to work properly, the actuator must be able to generate enough output force to ensure a high degree of sealing and valve opening.
For double-acting pneumatic, hydraulic, and electric actuators, there is generally no return spring. The size of the force is independent of its direction of operation. Therefore, the key to selecting the actuator is to find out the maximum output force and the rotational torque of the motor. For single-acting pneumatic actuators, the output force is related to the opening of the valve, and the force appearing on the regulator valve will also affect the motion characteristics, so it is required to establish a force balance in the opening range of the entire regulating valve.
Actuator type determination
After the output force of the implementing agency is determined, the corresponding implementing agency is selected according to the environmental requirements for the use of the process. When there is an explosion-proof requirement at the site, pneumatic actuators should be used. Considering energy conservation, electric actuators should be selected as far as possible. If the adjustment accuracy is high, select the hydraulic actuator. Such as the power plant transparent machine speed adjustment, refinery catalytic device reactor temperature regulation control.
The mode of action of the regulating valve
The mode of action of the regulating valve is only available when the pneumatic actuator is selected. The mode of action is formed by combining the positive and negative action of the actuator and the positive and negative action of the valve. There are four types of combination: positive (air-type), positive (reverse-type), positive-type (air-open type), and reverse-reverse (air-closed type). Open and air off two. The choice of the mode of action of the regulating valve is mainly considered in three aspects: a) process production safety; b) characteristics of the medium; c) guaranteeing product quality and minimizing economic losses
3 Unshaped Refractory for cement kilns
4 alumina-silicon series refractory brick for cement kilns
5 silica-mullite series abrasion resistance brick for cement kilnsProduct advantage:
Refractory material for cement production must be one of the basic materials, occupies an important role in the normal operation of production line, energy conservation and emissions reduction of cement enterprise also has a great influence.
1 directly affect the operation of kiln refractory, through optimize the distribution of refractory quality and prolong the service life and can greatly improve the operation rate of cement production line, reduce the production cost of cement enterprise, create value for its
2 The quality of refractory material is optimized and the production line is improved
3 The quality optimization and service life of the refractory material are extended, and the cost of the use of Refractory Materials in cement factories can be effectively saved.
Valve body type selection
The valve body of the regulating valve is of many types. The commonly used types of valve body include a straight single seat, a straight through seat, an angle shape, a diaphragm, a small flow, a three-way, an eccentric rotation, a butterfly shape, a sleeve type, and a spherical shape. When making specific choices, consider the following:
(1) The valve core shape structure is mainly based on selected flow characteristics and unbalanced forces.
(2) Wear resistance When the fluid medium is a suspension containing a high concentration of abrasive particles, the internal material of the valve is hard.
(3) Corrosion resistance Due to the corrosive nature of the medium, try to choose a simple structure valve.
(4) Temperature and pressure of the medium When the temperature and pressure of the medium are high and the change is large, the valve whose valve core and valve seat materials are subject to changes in temperature and pressure should be used.
(5) Preventing flashing and cavitation Flashing and cavitation are only produced in liquid media. In the actual production process, flashing and cavitation will form vibration and noise, shortening the service life of the valve. Therefore, in selecting the valve, the valve should be prevented from flashing and cavitation.
Regulator actuator selection
In order for the regulating valve to work properly, the actuator must be able to generate enough output force to ensure a high degree of sealing and valve opening.
For double-acting pneumatic, hydraulic, and electric actuators, there is generally no return spring. The size of the force is independent of its direction of operation. Therefore, the key to selecting the actuator is to find out the maximum output force and the rotational torque of the motor. For single-acting pneumatic actuators, the output force is related to the opening of the valve, and the force appearing on the regulator valve will also affect the motion characteristics, so it is required to establish a force balance in the opening range of the entire regulating valve.
Actuator type determination
After the output force of the implementing agency is determined, the corresponding implementing agency is selected according to the environmental requirements for the use of the process. When there is an explosion-proof requirement at the site, pneumatic actuators should be used. Considering energy conservation, electric actuators should be selected as far as possible. If the adjustment accuracy is high, select the hydraulic actuator. Such as the power plant transparent machine speed adjustment, refinery catalytic device reactor temperature regulation control.
The mode of action of the regulating valve
The mode of action of the regulating valve is only available when the pneumatic actuator is selected. The mode of action is formed by combining the positive and negative action of the actuator and the positive and negative action of the valve. There are four types of combination: positive (air-type), positive (reverse-type), positive-type (air-open type), and reverse-reverse (air-closed type). Open and air off two. The choice of the mode of action of the regulating valve is mainly considered in three aspects: a) process production safety; b) characteristics of the medium; c) guaranteeing product quality and minimizing economic losses
Cement kiln material
1 basicity Refractory Brick for clinkering zones in cement kilns
2 alkali- Resistant Brick for cement kilns3 Unshaped Refractory for cement kilns
4 alumina-silicon series refractory brick for cement kilns
5 silica-mullite series abrasion resistance brick for cement kilnsProduct advantage:
Refractory material for cement production must be one of the basic materials, occupies an important role in the normal operation of production line, energy conservation and emissions reduction of cement enterprise also has a great influence.
1 directly affect the operation of kiln refractory, through optimize the distribution of refractory quality and prolong the service life and can greatly improve the operation rate of cement production line, reduce the production cost of cement enterprise, create value for its
2 The quality of refractory material is optimized and the production line is improved
3 The quality optimization and service life of the refractory material are extended, and the cost of the use of Refractory Materials in cement factories can be effectively saved.
Refractories For Cement Industry
Unshaped Refractory Material,Excellent Refractory Mortar,Alkali Resistant Refractory
Zhengzhou YuXin Kiln Engineering Co.,Ltd. ,