How many minutes does it take to check the valve?

The pressure measurement time of different valves is different, and the welded pipes such as ppr, aluminum-plastic ppr, and steel-plastic ppr are 30 minutes (only exceeded, not less). The aluminum-plastic pipe is the kind of copper joint, and its time is 4 hours (half a working day). Galvanized pipe is 4 hours is also half a working day.

The test pressure is times the maximum possible working pressure (usually 8-10 kg water pressure), such as the pipe and PVC joint connection must wait for the PVC joint to connect for about 5 hours before the pressure can be tested, and the maximum pressure shall not exceed 6 kg. Generally, the pressure holding time of PP-R water pipe is 30 minutes, if the whole system has no leakage in the plug, etc., the pressure pointer drops to kilograms is within the normal range. Here's why:

The tubing is caused by internal pressure expansion, but the entire piping system must be inspected for safety reasons. Note: It is strictly forbidden to use an electric pump for pressurization.

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 shell test pressure of the valve should be several times the maximum allowable working pressure of the valve, and the sealing test pressure should be the times of the maximum allowable working pressure. The duration of the valve at the test pressure shall not be less than 5 minutes.

Tightness test of the valve:

1. Butterfly removal valve and check valve.

Foot valves, throttle valves.

In addition, the tightness test pressure of other valves should generally be equal to the nominal pressure of the valve.

It can also be used in times; 2. The working pressure is tested, and the inspection is carried out under the test pressure, and the sealing surface of the valve disc is not leaking or leaking;

3. For cast iron gate valves for water and cast copper gate valves for water with nominal pressure less than or equal to MPa, a trace amount of leakage is allowed, but the leakage amount is not allowed to exceed the relevant specified value.

The shell test pressure of the valve should be times the maximum allowable working pressure of the valve, and the seal test pressure should be times of the maximum allowable working pressure.

The duration of the valve at the test pressure shall not be less than 5 minutes.

For details, please see GB50235-2010 "Construction Code for Industrial Metal Pipe Engineering".

Valve inspection.

Nominal diameter dn (mm) Minimum test duration (s) Tightness test Strength test.

Metal Seals Non-metallic seals.

The test strength of the valve before installation is in accordance with the standard of MSS-SP-61 and API598 in the United States, the continuous water pressure test is 20 minutes, the test pressure is 150% of the design pressure, the pressure of the tightness test is 120 seconds of nitrogen test, and 110% of the design pressure of the pressure level

Under normal circumstances, the pressure test is carried out, and the pressure is maintained under the rated pressure for 30 minutes without leakage or the pressure drop is less than 5%. See GB50273 and GB50275

The valve must be tested for strength and sealing before leaving the factory, and it can only be shipped if it is qualified. If the user is not sure about this, he can do it again before installation, and the cost can be negotiated with the supplier.

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