Safety valves (also known as relief valves) automatically open and close based on the operating pressure (operating temperature) of the pressure system. They are typically installed on equipment or pipelines of closed systems to protect system safety. When the pressure or temperature inside the equipment or pipeline exceeds the set pressure of the safety valve, it automatically opens to release pressure or reduce temperature, ensuring that the pressure (temperature) of the medium inside the equipment and pipeline remains below the set pressure (temperature), protecting the equipment and pipeline from normal operation and preventing accidents, thereby reducing losses.

Valves can be used to control the flow of various types of fluids such as air, water, steam, corrosive media, slurry, oil products, liquid metals, and radioactive media. Valves are also classified by material into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, and custom non-standard valves.

A safety valve mainly consists of three parts: the valve seat, the valve disc (valve core), and the loading mechanism. The valve seat can either be an integral part of the valve body or assembled with it, and it is connected to the equipment. The valve disc is often connected to a valve stem, which is tightly fitted onto the valve seat. Above the valve disc is the loading mechanism, the size of which can be adjusted. When the pressure inside the equipment is within a certain working pressure range, the force exerted by the internal medium on the valve disc is less than the force applied by the loading mechanism on the valve, and the difference between the two constitutes the sealing force between the valve disc and the valve seat, causing the valve disc to press tightly against the valve seat, preventing the medium from being discharged from the equipment.

A safety valve is a safety device used to prevent pressure equipment and containers or those that could cause pressure to rise or internal pressure to exceed limits, resulting in rupture. Safety valves are widely used in pressure systems such as pressure vessels, boilers, and pressure pipelines, ensuring the safe operation of the pressure system.

With in the specified working pressure range, the opening pressure can be adjusted by rotating the adjustment screw to change the pre-tension compression of the spring. Remove the valve bonnet, loosen the locking nut, and then adjust the adjustment screw. First, increase the inlet pressure to make the valve pop open once. If the opening pressure is too low, tighten the adjustment screw clockwise; if it is too high, loosen it counterclockwise. After adjusting to the desired opening pressure, tighten the locking nut and put the bonnet back on. If the required opening pressure is beyond the working pressure range of the spring, a new spring with an appropriate working pressure range needs to be installed, and then the adjustment should be made. After replacing the spring, the corresponding data on the nameplate should be changed. After all adjustments to the safety valve are completed, it should be sealed with lead to prevent any unauthorized changes to the adjusted settings. Unless specified otherwise, safety valves are usually adjusted at room temperature air to the upper limit of the working pressure level (i.e., high pressure) when leaving the factory.