The function and principle of fire safety valves, and the role of safety valves

Fire safety valves.

The function is to drain the excess unwanted pressure from the system piping. The principle of the safety valve is to set the adjustment pressure of the safety valve spring, when the pressure exceeds the set pressure of the safety valve, the spring can not be locked and sealed, so the excess pressure is opened and discharged, when the pressure is stable in the set pressure, the spring is stable, and the system maintains the pressure state.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The function of the safety valve:

The safety valve plays a role in the safety protection of the system. When the system pressure exceeds the specified value, the safety valve is opened, and a part of the gas and fluid in the system is discharged into the atmosphere outside the pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not cause accidents due to excessive pressure.

Safety valves belong to the automatic valve category, which are mainly used in boilers, pressure vessels and pipelines, and the control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation. Note: Safety valves must be pressure-tested before they can be used.

There are two main types of safety valve structures:

Spring-loaded and lever-mounted. Spring-loaded refers to the force of the spring force between the sealing of the disc and the seat. The lever type relies on the force of the lever and the hammer.

With the need for large volumes, there is another pulse safety valve, also known as a pilot operated safety valve, which consists of a main safety valve and an auxiliary valve. When the pressure of the medium in the pipeline exceeds the specified pressure value, the auxiliary valve is opened first, and the medium enters the main safety valve along the conduit, and the main safety valve is opened to reduce the pressure of the increased medium.

The discharge of the safety valve is determined by the diameter of the valve seat and the opening height of the disc, and can also be divided into two types: the opening height of the micro opening type is (1 20) (1 40) of the inner diameter of the valve seat, and the full opening type is (1 3) (1 4).

In addition, there are closed and unclosed types depending on the requirements for use. The closed type means that the discharged medium does not leak, and all are discharged along the specified outlet, which is generally used for toxic and corrosive media. The non-enclosed type is generally used for non-toxic or non-corrosive media.

The above content reference: Encyclopedia - Safety Valve.

The working principle of the pressure relief valve of the fire protection system is as follows:

The pressure relief valve can be automatically opened and closed according to the working pressure of the system, and is generally installed on the equipment or pipeline of the closed system to protect the safety of the system. When the pressure in the equipment or pipeline exceeds the set pressure of the pressure relief valve, the pressure relief will be automatically opened to ensure that the medium pressure in the equipment and pipeline is below the set pressure, protect the equipment and pipeline, and prevent accidents.

The use of the fire pressure relief valve is as follows:

1. Before the pressure relief valve leaves the factory, its opening pressure should be adjusted to the setting value required by the user one by one. If the user proposes the working pressure level of the spring, it should generally be adjusted according to the lower limit value of the pressure level.

2. Before installing the pressure relief valve on the protected equipment or before installation, the user must re-adjust it at the installation site to ensure that the setting pressure value of the pressure relief valve meets the requirements.

3. Within the range of spring working pressure level indicated on the nameplate, the opening pressure can be adjusted by rotating the adjustment screw to change the spring compression.

4. Before rotating the adjustment screw, the inlet pressure of the valve should be reduced to the opening pressure.

90% or less to prevent the disc from being driven to rotate when rotating the adjustment screw, which may damage the sealing surface.

5. In order to ensure the accuracy of the opening pressure value, the medium conditions during adjustment, such as medium type and temperature, should be as close as possible to the actual operating conditions. The opening pressure often varies depending on the type of medium, especially when the aggregate state of the medium is different (e.g. from liquid to gaseous phase). As the operating temperature rises, the opening pressure generally decreases.

Therefore, when adjusted at room temperature and used at high temperature, the setting pressure value at room temperature should be slightly higher than the required opening pressure value. The degree of high is related to the valve structure and material selection, and should be based on the manufacturer's instructions.

6. When the conventional pressure relief valve is used to fix the additional back pressure, when the opening pressure is adjusted after the inspection (the back pressure is atmospheric pressure at this time), its setting value should be the required opening pressure value minus the additional back pressure value.

Safety is one of the most important issues in our lives. In some factories or machinery, safety valves will be used. This equipment will ensure our safety in use or production.

How to apply the safety valve well, we must first know the working principle of the safety valve. The safety valve is a special valve that the opening and closing parts are normally closed under the action of external force. When the pressure of the medium in the equipment or pipe rises above the fixed value, it can prevent the pressure of the medium in the pipe or equipment from exceeding the specified value by venting the medium to the outside of the system.

The safety valve is an automatic valve, which is mainly used in boilers, pressure vessels and pipelines, and the control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation. The jet safety valve must pass a pressure test before it can be used.

When the system pressure exceeds the specified value, the safety valve is opened, and a part of the gas and fluid in the system is discharged into the atmosphere outside the pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not cause accidents due to excessive pressure.

The safety valve is a special branch of the valve family, and its particularity is because it is different from other valves that only play the role of switch, and more importantly, it plays a role in protecting the safety of the equipment.