The failure of the American standard safety valve, the introduction of the American standard safety

The first fault is that the safety valve is leaking. The main reasons are (1) the contact surface between the valve core and the valve seat is not tight; (2) There is dirt on the contact surface between the valve core and the valve seat; (3) Stem skew.

The second fault is that the safety valve does not open when it reaches the specified pressure. The main reasons are (1) the valve core is stuck to the valve seat, which can be eliminated by manual exhaust test; (2) The spring adjustment pressure of the spring-type safety valve is too large and should be readjusted; (3) The hammer of the lever type safety valve should be moved backwards, and the hammer should be moved to the original constant pressure position and tightened with limiting screws.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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 American standard safety valve is a safety device to prevent the pressure equipment and the vessel or the easy wheel from bursting due to the pressure rise or the internal pressure of the vessel exceeding the limit. The safety valve is a kind of safety device widely used in pressure vessels, boilers, pressure pipelines and other pressure systems to ensure the safe operation of the pressure system in Zhenlakai.

When the pressure of the container exceeds the design specification, the safety valve is opened from the source to discharge the over-high pressure in the gas reduction device to prevent the container or pipeline from being damaged. When the pressure in the vessel drops to the normal operating pressure, it automatically shuts down to avoid the discharge of all gas due to overpressure of the container, which can cause waste and production interruption. The safety valve is mainly composed of three parts: the seat, the disc (spool) and the loading mechanism.

Some of the valve seats are integrated with the valve body, and some are assembled with the valve body, which communicates with the equipment. The disc is often attached to the stem, which is tightly attached to the valve seat. Above the disc is a loading mechanism, and the size of the load can be adjusted.

When the pressure in the equipment is within a certain working pressure range, the force of the internal medium acting on the valve disc is less than the force added 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, so that the valve disc is pressed against the valve seat, and the medium of the equipment cannot be discharged. When the pressure in the equipment exceeds the specified working pressure and reaches the opening pressure of the safety valve, the internal medium acts on the alarm valve and the force above is greater than the force exerted on it by the loading mechanism, so the valve disc leaves the valve seat, the safety valve is opened, and the medium in the equipment is discharged through the valve seat, if the displacement of the safety valve is greater than the safety release amount of the equipment, the pressure in the equipment gradually decreases, and after a short period of exhaust, the pressure drops back to the normal working pressure. At this time, the force of the internal pressure acting on the valve disc is less than the force exerted on it by the loading mechanism, and the valve disc is pressed against the valve seat again, the medium stops discharge, and the equipment continues to operate at normal working pressure.

Therefore, the safety valve is closed or opened by itself to prevent the equipment from overpressure by the force of the medium on the disc and the force of the loading mechanism.