How to use a safety valve?

The function of a safety valve is to prevent the medium from reaching excessive pressures and thus ensure safety. Its operation is generally automatic, and it can be connected either by flanges or threads. A safety valve is a valve used for safety protection. Its basic principle is that when the pressure of the medium exceeds a predetermined value, the safety valve opens to release pressure; when the pressure falls below that predetermined level, the safety valve closes. There are three common types: spring-type, weight-type (lever-type), and pilot-type (pulse-type). The weight-type safety valve is an older type of valve; it uses levers and weights to counteract the pressure on the valve disc. It offers reliable performance, but it is bulky, has large dimensions, and a low reset pressure, which is why it has been gradually replaced by spring-type safety valves. Spring-loaded safety valves are widely used, and they are further divided into full-opening type and slight-opening type depending on the opening height of the valve disc. The full-lift type has a large discharge capacity and good rebound strength, and is suitable for liquid and gas media; the partial-lift type is only suitable for liquid media. When the medium pressure exceeds the specified value, it overcomes the spring preload and the valve opens to release pressure; when the pressure is low, the spring closes it automatically. In a pilot-operated safety valve, the main valve and the pilot valve are connected together, with the pulse action from the pilot valve driving the operation of the main valve. In literary works, a metaphor is used to describe something as a safety valve: it releases pressure when it becomes too high, and it closes automatically under normal conditions to maintain the pressure.

Of course, it is used in special situations, such as when the pressure exceeds the allowable level, and it must be released to protect the equipment or pipes.:lol

It serves a safety purpose – the valve opens in case of overpressure!

When the pressure inside the container exceeds the limit, the safety valve releases pressure to bring it back within safe levels.

Safety valves are generally used in pressure vessels and pressure pipelines. When the pressure of the medium stored within them exceeds the valve’s maximum allowable pressure, it opens automatically to release pressure and thus ensure the safety of the pressure vessel. For example, a safety valve is installed on air storage tanks, with a rated pressure of 10 MPa; when the pressure of the gas inside the tank exceeds 10 MPa, the valve opens automatically to release pressure. Components like safety valves usually have dedicated personnel in charge of them, and they are registered with the safety departments of the local technical supervision agencies. Regular inspections are required to ensure their proper functioning. :handshake

Think of it like the \"emergency exits\" in various high-rise buildings: they don’t function unless there is a danger; they only activate when the pressure exceeds the predetermined limit, thereby ensuring pressure balance within the tank! It’s very similar to emergency vent manholes and breather caps!

Safety valves are generally used in pressure vessels and pressure pipelines; when the operating pressure of the medium exceeds the set pressure of the safety valve, it opens automatically to release pressure and ensure the safety of the entire system. Safety valves must be inspected annually by the technical department.

A safety valve must be installed in any of the following situations: 1. An independent pressure system (separated from other systems by a shut-off valve). This system refers to all-gas phase, all-liquid phase, or gas-connected ； 2. In cases where there is no safety valve at the source of the pressurized material in the container ； 3. Containers and pipelines with a design pressure lower than the pressure at the source of pressure ； 4. Outlet pipes for positive displacement pumps and compressors ； 5. Vessels subjected to overpressure due to the accumulation of non-condensable gases ； 6. If a shut-off valve or control valve is installed on the outlet pipeline of the heating furnace, a safety valve should be installed upstream of such valve ； 7. Overpressure areas caused by process accidents, automatic control failures, power supply failures, fire incidents, and utility system failures ； 8. The area where the liquid undergoes thermal expansion due to the closed valves at both ends ； 9. Steam outlet pipe of the condensing turbine ； 10. In some cases, due to leakage in the pump outlet check valve, a safety valve is installed on the pump’s inlet pipeline ； 11. Other locations where safety valves should be installed.

Safety valves are used in pressurized equipment, containers, or pipelines as overpressure protection devices.