Special ball gate globe valve for coal chemical industry - part two
Posted: 04/26/2020 18:18:52 Hits: 22
Check valve for coal chemical industry
According to the structure of the check valve, it can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valve can be divided into vertical type and horizontal type. Swing check valve is divided into three types: single-disc, double-disc and multi-disc. The butterfly check valve is straight-through. The above types of check valves can be divided into three types: threaded end check valves, flanged end check valves and welded end check valves. Large size check valves should be supported independently from the pressure of the piping system.
Safety valve for coal chemical industry
The safety valve is an automatic pressure relief protection device that is opened by imported static pressure. It is one of the most important safety accessories for pressure vessels. Its function is: when the pressure in the vessel exceeds a certain value, the valve is automatically opened relying on the pressure of the medium itself, and a certain amount of medium is quickly discharged. When the pressure in the vessel drops to the allowable value, the valve automatically closes again, so that the pressure in the container is always lower than the upper limit of the allowable pressure, automatically preventing accidents that may occur due to overpressure, so a safety valve is also called the final protective device for pressure vessel.
Pressure relief valve for coal chemical industry
The pressure relief valve is used to adjust the flow of the medium by controlling the opening of the opening and closing member in the valve body, and then reduce the pressure of the medium. At the same time, the opening of the opening and closing member is adjusted by the effect of the pressure behind the valve to keep the pressure behind the valve within a certain range, and cooling water is injected into the valve body or behind the valve to reduce the temperature of the medium. This valve is called a pressure relief and temperature reduction valve. The pressure reducing valve can be divided into diaphragm type, spring diaphragm type, piston type, lever type and bellows type according to the structural form.
Solenoid valve for coal chemical industry
Solenoid valve is an automatic basic element used to control fluid, which belongs to actuators; it is not limited to hydraulic actuator and pneumatic actuator. Solenoid valves are used to control the direction of hydraulic flow. The mechanical devices in factories are generally controlled by hydraulic steel, so solenoid valves will be used. There is a closed cavity in the solenoid valve, and there are through holes in different positions, with each hole leading to different oil pipes. The middle of the cavity is a valve, with two electromagnets on both sides, and the valve body will be attracted to the one side, which side of the magnet coil is energized. By controlling the movement of the valve body to block or leak out the different oil discharge holes, and the oil inlet hole is normally open, the hydraulic oil will enter the different oil discharge pipes, and the piston is then pushed by the pressure of the oil, the piston drives the piston rod, and the piston rod drives the mechanical device. In this way, by controlling the current of the electromagnet, the mechanical movement is controlled.
Control valve for coal chemical industry
The control valve is used to regulate the process parameters of medium flow, pressure, temperature, liquid level in the field of industrial automation process control. According to the control signal in the automation system, the degree of the valve's opening is automatically adjusted to achieve the adjustment of medium flow, pressure, temperature and liquid level. The control valve is usually composed of an electric actuator or a pneumatic actuator and a valve body. There are two types of straight travel control valve: straight-through single-seat type and straight-through double-seat type. The latter has the characteristics of large circulation capacity, small unbalanced operation and stable operation, so it is usually particularly suitable for large flow, high pressure drop and less leakage. The quarter-turn control valve mainly includes: V-type electric regulating ball valve, electric butterfly valve, ventilation regulating valve, eccentric butterfly valve, etc.
