Views: 0 Author: Site Editor Publish Time: 2024-11-13 Origin: Site
The basic functions of the valve include opening and closing, flow regulation and pressure control. The On and off function enables the flow to be switched on and off, and plays a role in pipeline maintenance or system startup and shutdown. The flow regulation function allows the precise control of the flow rate and flow rate of the fluid according to the actual needs, such as in the heating system, the hot water flow can be adjusted by the valve to control the indoor temperature. Pressure control is completed by special valves such as safety valves. When the system pressure exceeds the set value, the safety valve automatically opens to relieve pressure to prevent overpressure from causing danger.
Common valve types are rich and varied. The gate valve, whose gate plate moves vertically along the center line of the seat, has the advantage of low fluid resistance and is suitable for infrequent opening and closing operations in large-caliber pipelines, such as urban water supply main pipelines. The disc of the globe valve moves in a straight line along the center of the seat, which can accurately control the flow rate, but the pressure loss is relatively large, and it is often used in the pipeline of steam, water and other media. Ball valve ball rotation to control fluid on and off, compact structure, good sealing performance and fast opening and closing, widely used in oil and natural gas transmission. The disc of the butterfly valve rotates around the inner axis of the valve seat in a disc shape. It has the characteristics of simple structure, small volume and convenient operation, and is especially suitable for the flow regulation of large diameter pipelines.
In the industrial field, valves are widely used. The petrochemical industry needs to withstand high temperature, high pressure and strong corrosive media, which requires very high corrosion resistance, sealing and reliability of the valve. Different types of valves are used to control raw material transportation, reaction process and product output. In the power industry, the valve of the steam system should be resistant to high temperature and high pressure to ensure the stable operation of the power generation equipment; Water treatment system valves need to have good corrosion and wear resistance. In the field of construction, whether it is the water supply and drainage system to ensure the normal supply of domestic water and sewage discharge, or the HVAC system to regulate the flow of air and water, valves are indispensable.
