Valve Acceptance Requirements, Etc.

Acceptance requirements

Acceptance follows HG 20202-2000 "Degreasing Engineering Construction and Acceptance Specifications". Before assembly, each component is wiped with clean precision filter paper, and the dead corners of the components are selected. The filter paper is qualified if the color does not change.

Valve Specification Requirements

1. The model of the valve should indicate the requirements of the national standard number. If it is an enterprise standard, the relevant description of the model should be indicated.

2. The working pressure of the valve is required to be greater than or equal to the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline.

3. The valve manufacturing standard should indicate the national standard number based on it. If it is an enterprise standard, the enterprise document should be attached to the purchase contract.

Performance testing requirements

1. When a valve is manufactured in batches of a certain specification, an official agency should be entrusted to carry out the following performance tests: 1. The opening and closing torque of the valve under the condition of industrial pressure; 2. The detection of the flow resistance coefficient of the valve under the condition of pipeline water delivery.

2. The valve should be tested as follows before leaving the factory: ① When the valve is open, the valve body should be subject to an internal pressure test that is twice the working pressure value of the valve; ② When the valve is closed, both sides are subject to 11 times the working pressure of the valve. value, no leakage; but the metal-sealed butterfly valve, the leakage value is not greater than the relevant requirements.