How to do the pressure test of the valve of the plumbing

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 seal is tested by the multiple of the valve pressure, and the shell is tested by the multiple of the valve pressure, and the internal leakage and external leakage will be tested.

After the installation of the plumbing pipeline is completed, the pressure tightness test should be done, and the valve will be tested by the way.

Valve Hydrostatic Strength Test Steps:

1.Use the pressure test system of Simint valve to fill the valve with water and discharge the internal air;

2.The valve is in the open and closed state. Slowly rise to the test pressure (the test pressure is a multiple of the working pressure);

3.After the test pressure is reached, stop the machine to maintain pressure, maintain pressure for more than 5min, there should be no leakage at the valve cover of the shell packing, and the instrument control system and pressure collection system should show no leakage and no pressure drop system.

Valve tightness test procedure:

1.Enter the "Valve Test" screen, set the DEH "Tightness Test Allow" to the "Allow" position, press the "Main Valve Tightness Test" button in the OIS "Valve Test" screen, the high and medium pressure main valves should be closed, DEH switches to manual, the tightness test starts timing, DEH calculates the "acceptable speed" according to the relevant parameters, records the speed idling time, and determines the tightness of the valve according to the time consumed when Daru carries the required speed of the test;

2.Press the button of "Adjusting Door Tightness Test" in the OIS "Valve Test" screen, the high and medium pressure adjusting doors should be closed, DEH switches to manual, the tightness test starts timing, DEH calculates the "acceptable speed" according to the relevant parameters, and determines the tightness of the valve.

Summary. In the process of welding the boiler, every staff member must be certified to work, in accordance with the rules and procedures, and the welding personnel need to have a certain welding experience, in the welding process is strictly forbidden to change the welding equipment or welding methods without permission. In order to avoid self-damage, all protective measures should be taken when welding.

Boiler installation is an extremely tedious and complex work, and there is a certain danger, so in the process of installing the boiler, it is necessary to do a good job in the overall construction plan and on-site management.

What to do with the boiler overall water pressure test + valve.

When the hydraulic test of the pipeline valve is carried out, the Cologne mass flow meter must be carried out at the nominal pressure to ensure that there is no pressure drop and leakage in the test, and the time in the test should be more than 10 minutes. Qualified demineralized water must be used throughout the test, and the test must not be overpressurized. In the process of pressure relief and lack of jujubes, the pressure can not be relieved through the exhaust valve, and the exhaust valve can be opened in the hall after normal pressure.

In the process of welding the boiler, every staff member must be certified to work, in accordance with the rules and procedures, and the welding personnel need to have a certain welding experience, in the welding process is strictly forbidden to change the welding equipment or welding methods without permission. In order to avoid self-damage, all anti-Jane guessing measures should be taken during welding. Boiler installation is an extremely tedious and complex work, and there is a certain danger, so in the process of installing the boiler, it is necessary to do a good job in the overall construction plan and on-site management.

Ask about custom messages].

What to do with the boiler overall water pressure test + valve.

1. Close: feed water main valve, feed water bypass valve, water supply pipeline discharge valve, economizer water discharge valve, desuperheating water inlet valve, continuous discharge, fixed discharge, dosing, sampling valve, accident water discharge and its bypass valve, air exhaust electric valve, backflush valve, main steam valve and its bypass valve, superheater trap, desuperheater air valve, water level gauge drain valve, recirculation valve. 2. Open:

Drum air door, superheater outlet box air door, economizer air door, all pressure gauge valves, water level gauge valve, economizer intake water valve, and trap valve in front of the furnace door. The chief of the report report contact the chemical, the boiler needs to carry out the water pressure test, please make preparations for the failure of the dust, prepare enough water, and can put water on the boiler according to the relevant provisions of Chapter 3.

Summary. Hello dear, valves that need 100% hydrostatic test are:1

Large-caliber (DN600 or more.)Over the dangerous gas, 3Mainly, 4

Emergency shut-off valve, 5Safety valve, 6New products, 7

Provided by the new ** business; If there is no condition to create any of the following items, it will also be suppressed12Emergency shut-off valve 3

Toxic gases and close to the location of personnel.

What valves need to be 100% hydrostatic tested.

Hello, dear, the valve needs 100% water slag draft pressure test are: 1Large-caliber (DN600 or more.)

Over the dangerous gas, 3Mainly, 4Emergency shut-off valve, 5

Safety valve, 6New products, 7Provided by the new ** business; If there is no condition to create any of the following items, the embedded parts should also be suppressed1

2Tighten the beam ant emergency shut-off valve 3Toxic gases and close to the location of personnel.

The best way to deal with the "running, running, dripping, and leaking" of pipeline valves is to prevent problems before they occur. Before the valve fails, we can find the problem in time and avoid the accident through the following methods. Prevention refers to the leakage of the valve and the leakage of all cavity valves, and the water pressure test of different grades must be carried out after the water and land valves are rolled into the factory.

Valves that need to be dismantled for overhaul must be ground. During the overhaul process, it is necessary to carefully check whether there is any packing and whether the packing gland is tightened. Before installing the valve, it is necessary to check whether there is dust, sand, iron oxide and other debris inside the valve.

If there is any of the above-mentioned debris, it must be cleaned up before installation.

All valves must be fitted with gaskets of the appropriate grade prior to installation. When installing the flange door, the fasteners must be tightened, and when tightening the flange bolts, they must be tightened in a symmetrical direction. In the process of valve installation, all valves must be correctly installed according to the system and pressure, and it is strictly forbidden to install them indiscriminately and mix them with drafts.

For this reason, all valves must be numbered and documented by system before installation.

A valve is a pipeline attachment used to open and close pipelines, control the flow direction, regulate and control the parameters (temperature, pressure and flow rate) of the conveyed medium. According to its function, it can be divided into shut-off valves, check valves, regulating valves, etc. The valve is a control component in the fluid transportation system, which has the functions of shut-off, regulation, diversion, prevention of backflow blocking, pressure stabilization, diversion or overflow pressure relief.

Jane Tsai valves for fluid control systems range from the simplest globe valves to the most complex automatic control systems, with a wide variety of varieties and specifications.

The valve can be used to control the slip flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Valves are also divided into cast iron valves, cast steel valves, stainless steel valves, etc.), chrome-molybdenum steel valves, chrome-molybdenum vanadium steel valves, duplex steel valves, plastic valves, non-standard customized valves, etc.

Steam and hot water heating system should be added to the working pressure at the apex of the system for hydraulic test, and the test pressure at the apex of the system is not less than .

2. For high-temperature hot water heating system, the test pressure should be the working pressure at the top of the system.

3. The hot water heating system using plastic pipes and composite pipes should be tested by the working pressure at the apex of the system, and the test pressure at the apex of the system should not be less than .

Test method: The heating system using steel pipes and composite pipes should not be greater than the pressure drop within 10min under the test pressure.

Check after dropping to working pressure, no seepage and no leakage; The heating system using plastic pipes should not be greater than the pressure drop within 1h under the test pressure, and then the pressure should be reduced to times the working pressure, and the pressure should be stabilized for 2h, and the pressure drop should not be greater than , and the connections should not seep or leak.

A hydrostatic test must be done, and the test pressure is generally a multiple of the used pressure, not less than 6 bar. The pressure of the central heating system takes the most unfavorable loop, calculates the resistance of the boiler, main pipe, branch pipe, end, and then puts a certain safety.

Summary. There are generally three types of boiler inspections: external inspection (once a year), internal inspection (once every two years), and hydrostatic test (once every six years).

Article 202 of the Regulations for the Safety and Technical Supervision of Steam Boilers The boiler in use is generally inspected once a year, an internal inspection is conducted every two years, and a hydrostatic test is conducted every six years. When the internal inspection and the external inspection are carried out in the same year, the internal inspection should be carried out first, and then the external inspection. The internal inspection and hydraulic test cycle of the power generation boiler of the power system can be appropriately adjusted according to the overhaul cycle of the power plant.

For boilers that cannot be inspected internally, a hydrostatic test should be carried out every three years.

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There are generally three types of boiler inspection: external inspection (once a year), internal inspection (once every two years), and hydraulic pressure dismantling test (once every six years). Article 202 of the Regulations for the Safety and Technical Supervision of Steam Boilers The boiler in use is generally inspected once a year, an internal inspection is carried out every two years, and a hydraulic test is carried out every six years.

When the internal inspection and the external inspection are carried out in the same year, the internal inspection should be carried out first, and then the external inspection. The internal inspection and hydraulic test cycle of the power generation boiler of the power system can be appropriately adjusted according to the overhaul cycle of the power plant. For boilers that cannot be inspected internally, a hydrostatic test should be carried out every three years.

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Whether the pneumatic valve is installed before or after the hydrostatic test.

Whether the pneumatic valve of the pipeline is installed before the hydrostatic test or after the hydrostatic test.

Before the pneumatic valve is installed and used, the valve must be inspected and tested for on/off operation before the wheel is installed. Only under the condition of normal operation can this burial be installed.

Hydrostatic test before packing.

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