Diverter quality appraisal

water distributor is a device that divides one incoming water into several outputs through a container. It can distribute water or hot water from the pipe network system to areas or equipment that need water supply through the water distribution main pipe to realize water distribution and regulation. The functions of the
water distributor mainly include controlling water flow and reducing the impact of water flow to adapt to different needs. At the same time, it facilitates operation and maintenance, and reduces system pressure difference and system energy loss. Water distributors are widely used in boilers, central air conditioners, industrial circulating cooling water systems, hot water systems and floor heating systems.
In the case of water distributor quality appraisal, Zhongke Testing can provide water distributor quality appraisal services.

water distributor is divided into three types: basic type, standard type and functional type.

XF 868-2010 Water distributor and collector
GB/T8464-2008 Iron and copper threaded connection valve
GB/T3287-2011 Malleable iron pipe connection
GB/T7307-2001 55° non-sealing pipe thread

The filter valve of the heating water distributor in the kitchen of the house involved in the case cracked, causing water leakage. The leakage caused damage to the house involved and the property of the residents downstairs.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the filter valve of the heating water distributor in the kitchen of the house involved.
identification and analysis results: The
identification and analysis expert group discussed and conducted a comprehensive quality and technical analysis on the relevant information and on-site investigation of the heating water distributor filter valve in the kitchen of the house involved in the case, and made the following suggestions and conclusions:
The threaded connection involved in the case The thread size of the pipe plug connected to the filter valve, the final appearance inspection and the pipe plug type and size do not meet the relevant requirements of the standards of GB/T8464-2008 "Iron and copper threaded connection valves", GB/T3287-2011 "Male cast iron pipe connectors", and GB/T7307-2001 "55° non-sealing pipe threads".
The cracking of the above-mentioned pipe plug is suspected of fatigue failure. The source of the crack originated from the obvious knife marks machined on the inner surface of the pipe plug. The thread size and pipe plug type size were also lower than the standard requirements. Therefore, during the heating period in 2017, the pipe plug continued to withstand tensile stress and low-frequency impact. Machine processing on the inner wall Stress concentration occurred at the obvious knife marks and micro-cracks originated. The micro-cracks continued to develop under the action of the above-mentioned tensile stress and low-frequency impact. During the pressure test process of water supply reloading pressure in 2019, the pipe plug once again suffered the combined effects of tensile stress and low-frequency impact. The cracks expanded rapidly and led to penetrating cracking failure.