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14 taboos to install a valve(below)

 Taboo 12: The specifications and models of the installed valves do not meet the design requirements.

For example, the nominal pressure of the valve is less than the system test pressure; the gate valve is used for the branch pipe of the water supply when the diameter is less than or equal to 50mm;Consequences: Affects the normal opening and closing of the valve and adjusts resistance, pressure and other functions. It even caused the valve to be repaired during system operation.

Measures: Familiar with the application scope of various valves, and choose the specifications and models of the valves according to the requirements of the design. The nominal pressure of the valve should meet the requirements of the system test pressure. According to the requirements of the construction code: a stop valve should be used for the pipe diameter of the water supply branch pipe less than or equal to 50mm; a gate valve should be used when the pipe diameter is greater than 50mm. Gate valves for hot water heating, dry, and vertical control valves should be used, and cast iron butterfly valves should not be used for fire pump suction pipes.

Taboo 13: Do not perform necessary quality inspections according to regulations before valve installation.

Consequence: The valve switch is not flexible during the operation of the system, the closure is not strict, and the phenomenon of water leakage (steam) occurs, which causes rework repair and even affects normal water supply (steam).Measures: Before the valve is installed, the pressure strength and tightness test should be performed. The test shall be carried out by random inspection of 10% and not less than one in each batch (same brand, same specification, same model).

For the closed-circuit valve installed on the main pipe to cut off, the strength and tightness test should be performed one by one. The strength and tightness test pressure of the gost globe valve shall comply with the "Code for Acceptance of Construction Quality of Building Water Supply and Drainage and Heating Engineering" (GB 50242-2002).

Taboo 14: The main materials, equipment and products used in construction lack the technical quality appraisal documents or product certifications that meet the current standards issued by the country or department.

Consequences: The quality of the project is unqualified, there are hidden dangers of accidents, it cannot be delivered and used on schedule, and it must be reworked for repairs; causing delays in the construction period and increased labor and material inputs.

Gate Valve

Measures: The main materials, equipment and products used in water supply, drainage and sanitation engineering shall have the technical quality appraisal documents or product certifications in accordance with the current standards issued by the country or department; their product names, models, specifications, and national quality standards shall be indicated. Code, date of manufacture, name and location of the manufacturer, inspection certificate or code of the manufactured product.

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