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Taboos and measures for installation of drainage valves
Jun 13, 2018

Water supply and drainage engineering plays an important role in building and installation works, and is an important factor affecting the quality of construction projects. In the process of engineering construction, many technicians who started installation engineering did not study much on the specifications of hydropower, resulting in a lot of water and electricity installation works in construction. There are various reasons for the failure of the regulating valve. According to the analysis of the different causes of the fault and the maintenance of the regulating valve in the light of the working conditions of the world, it plays an important role in ensuring the safe and stable operation of the equipment and the safety of the production. It also provides guidance for the management of the regulating valve.

No quality inspection before the valve is installed

Consequences: the valve switch is not flexible in the operation of the system, closes the phenomenon of no smoke and leakage (steam), resulting in rework repair and even the normal water supply (steam).

Measures: pressure and strength test should be done before valve installation. The test shall be conducted at 10% per batch (the same grade, the same specification and the same type) and not less than one. For closed circuit valves installed on main pipes, strength and tightness tests shall be done one by one. Valve test valve strength and tightness test pressure should meet the "building water supply and drainage and heating engineering construction quality acceptance specification" (GB 50242-2002).

Valve installation error

Consequences: valve failure, switch maintenance troubleshooting, valve stem tends to cause leakage.

Measures: strictly according to the valve installation instructions to install, the rod valve stem length to open the opening height, the butterfly valve fully consider the handle rotation space, the various valve rods can not be lower than the horizontal position, more can not be down. The hidden valve should not only set up the check door to meet the need of valve opening and closing, but also stem should face the check door.

Common valve flanges for butterfly valve flanges

Consequences: the size of the butterfly valve flange and the common valve flange size is different, some of the flange diameter is small, and the valve disc of the butterfly valve is large, so that the valve can not be opened or hard to open, so that the valve is damaged.

Measures: according to the actual size of butterfly valve flange processing flange.

No holes and embedded parts are reserved for building structure construction.

There are no reserved holes and embedded parts or reserved holes in the construction of the building structure. The size of the reserved holes is too small and the embedded parts are not marked.

Consequences: in the construction of warm water projects, it is necessary to chisel the structure of the building and even cut the steel bar to affect the safety performance of the building.

Measures: conscientiously familiar with the construction drawings of the warm health engineering, according to the needs of the pipeline and the support and hanger installation, actively cooperate with the construction structure to reserve the hole and the pre embedded parts, and specifically refer to the requirements of the design and the specification of the construction.

Materials used in construction are short of identification documents or product certificates.

The main materials, equipment and products used by the workers are lack of technical quality appraisal documents or product certificates that conform to the current standards issued by the state or departments.

Consequences: the quality of the project is not qualified, there is an accident hidden danger, can not be delivered on time, must be reworked and repaired, cause delay in the time of work, and increase the labor and material input.

Measures: the main materials, equipment and products used for water supply and drainage and thermal protection projects should be certified by the state or department in accordance with the current standards for technical quality identification or product qualification; the name, model, specification, national quality standard code, date of factory production, manufacturer's name and place, and factory products shall be marked. A test certificate or code name.