Test methods and inspection rules for cast iron gates
1  Sealing surface clearance inspection
The joint surface of the door panel and the door frame sealing seat must be cleaned of foreign debris and oil stains, and the gate must be fully closed and then laid flat. In the case of no external load on the door panel, use a 0.1mm feeler gauge to measure the gap along the sealed joint surface, and the value shall not exceed 0.1mm.

2  assembly inspection
Seat the door panel in the door frame and perform full-open and full-close reciprocating movement. Check the position of the door panel when fully opened and fully closed, the wedging condition of the wedge surface and the gap between the door panel in the guide groove. Use tools such as steel ruler and feeler gauge to measure separately, and the inspection results should meet the requirements of 4.3.2 ~ 4.3.4.

3  leak test
The sealing surface should be cleaned of any dirt, and grease must not be applied between the two sealing surfaces. Fully close the gate so that the door frame opening is upward, and then pour clean water into the door frame opening gradually. As long as the water does not overflow, the water leakage of the sealing surface should not exceed 1.25L/min·m (seal length).

4 full pressure leak test
When the ordering unit needs to carry out this experiment, it can negotiate with the manufacturer. Test method: The gate can be installed in the test pool or on-site for full pressure irrigation test. Use measuring instruments (graduating cylinder, chronograph, etc.) to detect the leakage of the sealing surface, and its value should not exceed 1.25L/min·m (seal length).

5 Factory inspection
Each product must be inspected by the manufacturer's quality inspection department in accordance with this standard, and the product quality inspection certificate issued before it can leave the factory.
   The ordering unit has the right to re-inspect the product in accordance with the relevant provisions of this standard, and the sampling amount is 20% of the batch. But no less than one and no more than three. If one of the results of the random inspection is unqualified, the re-examination shall be doubled. If there is still unqualified, the ordering unit may propose to inspect one by one or reject and replace qualified products.

6  type inspection

7  In one of the following cases, the type test can be carried out according to any one of the specifications in Table 1 within the gate hole size of 300~600mm, 700~1500mm, 1600~2000mm and 2100~3000mm:

a. During trial production of new products;
b. Trial type appraisal for transferring old products to factory production;
c. If there are major changes in structure, materials and processes, performance may be affected;
d. In normal production, inspect once every two years;
e. When production resumes after a long-term suspension of production.

8  type inspection items
(1) For door deflection measurement, it should meet the requirements of
(2) The full pressure leak test shall meet the requirements of 5.4.

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