The requirements of the safety valve, briefly describe what are the requirements for the selection o

The basic functions of the valve are shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief, etc. (1) U0005 gate valve: often used for shut-off flow.

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1. It must be completely sealed when closed.

2. The overflow range that can stabilize the overflow is large, and the pressure increase value of the enclosed liquid is not more than 20% of the adjusted pressure

3. Sensitive, accurate and reliable action.

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.

1. The form of spike sensitive and material safety valve is selected according to the loading mode, most of the containers with low working pressure and high temperature are selected lever type, and high-pressure vessels are generally spring type; According to the way of gas emission, if the medium in the container is toxic, flammable, explosive gas or refrigerant and other gases that will pollute the atmosphere, the closed type should be selected, and the air or other harmless gases can be semi-closed or open.

2. The rated discharge capacity of the safety valve must be greater than or equal to the safe discharge capacity of the container.

3. The maximum working pressure of the safety valve shall not be higher than its own nominal pressure, otherwise the strength of the valve body is not enough, and the valve with too high nominal pressure should not be selected, which not only has high investment but also affects the opening accuracy.

Safety valve installation is a mustInstalled vertically in the boiler and as close as possible to the protected equipment or pipeline, the maximum pressure loss from the protected equipment to the inlet pipe of the safety valve shall not exceed 3% of the constant pressure of the safety valve.

The safety valve is a special branch of the valve family, and its particularity is that the safety valve 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. When the medium pressure in the equipment or pipeline rises to exceed the specified value, it is a special Biliang valve that discharges the medium outside the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value.

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 the operation of the equipment. Safety valves must be pressure-tested before they can be used.

Installation Requirements:

1. The safety valve should be equipped with an overhaul platform. When arranging the heavy safety valve, it is necessary to consider the possibility of hoisting after the safety valve is disassembled, and a boom should be set up if necessary.

2. The cross-sectional area of the connecting Huishan connecting the short pipe between the safety valve and the boiler pressure vessel shall not be less than the flow section of the safety valve, and the whole safety valve shall be installed on a pipe at the same time, and the cross-sectional area of the connection shall not be less than the sum of the flow cross-sectional area of the safety valve.

3. The inlet pipe of the safety valve should adopt a long radius elbow.

4. The design of the outlet pipeline of the safety valve should consider that the back pressure should not exceed a certain value of the constant pressure of the safety valve. The back pressure of the ordinary spring-type safety valve does not exceed 10% of the constant pressure value of the safety valve.

5. When the medium discharged into the venting main pipe or the de-flare main pipe contains condensate or condensable gas, the outlet of the safety valve should be higher than the main pipe; Otherwise, drain the liquid.

The function of the safety valve: (1) Switch. (2) Protection system.

In addition to acting as a switch, the safety valve can also play a role in protecting the system. Safety valve is a special valve, which is mainly used in boilers, pressure vessels, and pipelines. The following is an elaboration on the "role of the safety valve", and interested friends can continue to read and understand.

1. Bibidan function: (1) switch. (2) Protection system repentance.

2. Category: Ampere deficit valve belongs to the automatic valve category.

3. Technical terms: nominal pressure, discharge pressure, return pressure, back pressure, opening and closing pressure difference, flow channel area, discharge area, rated displacement coefficient, sealing test pressure, flutter, etc.

4. Classification: From the perspective of overall structure and loading structure, safety valves can be divided into spring-type safety valves, control safety valves, and heavy-hammer lever safety valves.

<> definition: safety valve is a special valve that is normally closed under the action of external force on the opening and closing parts, and when the medium pressure in the equipment or pipeline rises more than the specified value, the medium in the pipeline or equipment is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. By reading the above "Functions of Safety Valves" and "Definition of Safety Valves", I hope to provide you with a reference.

Generally speaking, the direction of the valve is the same, twisting to the left is to close, twisting to the right is to open the valve, pay attention to the arrow sign on the valve. When testing the water, keep people at home and open the inlet and return valves. The running wind should be turned off. Do not shake the heater and do not bear weight on the heating lines.

Non-professionals should not dismantle and change the heating, the valve should not be opened and closed frequently in the heating season, the valve can only be in a fully open or fully closed state, and when there is a water leak, the water inlet and return valves should be closed immediately.