Plug valve refers to a rotary valve whose closing member is in the shape of a plunger. Through 90° rotation, the channel port on the valve plug is connected or separated from the channel port on the valve body to realize opening or closing. The shape of the valve plug can be cylindrical or conical. The principle is basically similar to that of the ball valve. The ball valve is developed on the basis of the plug valve. It is mainly used in oilfield exploitation and also in petrochemical industry. Safety valve refers to the overpressure protection device on the pressurized container, equipment or pipeline. When the pressure in the equipment, container or pipeline rises beyond the allowable value, the valve will automatically open and then discharge in full to prevent the equipment, container or pipeline and pressure from continuing to rise; when the pressure drops to the specified value, the valve should automatically Shut down in time to protect the safe operation of equipment, vessels or pipelines.
Steam trap valve: Some condensed water will be formed in the medium of conveying steam, compressed air, etc. In order to ensure the working efficiency and safe operation of the device, these useless and harmful media should be discharged in time to ensure the consumption and use of the device. It has the following functions: can quickly remove the condensed water produced; prevent steam leakage; remove air and other non-condensable gases. The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and relies on the energy of the medium itself to automatically keep the outlet pressure stable. Check valve is also called reverse flow valve, check valve, back pressure valve and one-way valve. These valves are automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, and belong to an automatic valve. The check valve is used in the pipeline system, and its main function is to prevent the backflow of the medium, the reverse rotation of the pump and the driving motor, and the discharge of the container medium. Check valves can also be used on pipelines that supply supply to auxiliary systems where the pressure may rise above the system pressure. They can be mainly divided into swing type (rotating according to the center of gravity) and lifting type (moving along the axis).
