GB/T 26712-2021Supply stops for sanitary appliance and steam pipe (English PDF)

3.1 Angle valve for sanitary coming into drinking water

Angle valve for sanitary appliance installed on drinking water pipes (such as the front end of basin faucets, kitchen faucets and other water supply appliances).

3.2 Angle valve for cool water

Angle valve suitable for water temperature not higher than 50 °C.

3.3 Angle valve for hot water

Angle valve suitable for water temperature higher than 50 °C.

4.1 Classification

4.1.1 Divided into angle valve for sanitary appliance and angle valve for steam pipe according to their use. The codes are as specified in Table 1.

4.1.2 The valve body material in contact with water is divided into copper alloy, stainless steel, plastic, ceramic and others. The codes are as specified in Table 2.

4.1.3 Divided into internal thread and external thread according to the thread type of the water inlet end. The codes are as specified in Table 3.

4.1.4 Divided into DN15, DN20 and DN25 according to the nominal size of the water inlet end.

4.1.5 Divided into rotary type and push type according to the flow opening and closing control method.

4.2 Marking

Angle valves are marked as follows.

Example 1.The angle valve for sanitary coming into drinking water, whose valve body material is copper alloy, connection is external thread, nominal size is DN15, is marked as "JWY-TW15 GB/T 26712-2021".

Example 2.The angle valve for steam pipe, whose valve body is stainless steel, connection is external thread, nominal size is DN20, is marked as "JN-BW20 GB/T 26712-2021".

7.1 Appearance

7.1.1 The casting surface shall be free of obvious defects such as scratches, dents, shrinkage cavities, sand-holes, sharp edges, burrs, cracks and pores.

7.1.2 The surface of plastic parts shall not have obvious defects such as filler spots, ripples, overflow, shrinkage marks, warping, weld marks, etc.

7.1.3 The electroplated surface shall have a uniform gloss and shall not have defects such as peeling, cracking, burning, exposed bottom, flaking, black spots, obvious pitting, burrs, etc.

7.1.4 The sprayed surface shall have firm adhesion and uniform color, and shall not have obvious defects such as sagging, paint accumulation and exposed bottom.

7.1.5 The polished surface shall be smooth and free of obvious burrs, scratches, etc.

7.2 Processing and assembly

7.2.1 The external sealing pipe threads of the product shall comply with the provisions of GB/T 7306.1 or GB/T 7306.2; the external non-sealing pipe threads of the product shall comply with the provisions of GB/T 7307, and the external thread shall not be less than the Class B accuracy of GB/T 7307.

7.2.2 The thread surface shall not have obvious defects such as dents and broken teeth, and the surface roughness (Ra) shall not exceed 6.3 µm.

7.2.3 The maximum deviation of the angle between the axes of the two connecting threads on the valve body shall not exceed 2°.

7.2.4 The product shall be easy and smooth to open and close without any obstruction; the rotary angle valve shall be closed by rotating it in a clockwise direction and opened by rotating it in a counterclockwise direction.

7.2.5 Metal chips, impurities, etc. attached to the inner cavity of the product shall be cleaned out.

7.3 Dimensions

The dimensions of the product shall comply with the provisions of Appendix A.

7.4 Resistance to operational load

7.4.1 Push-type angle valve

Carry out the test according to 8.4.1. After withstanding an axial pressure of 250 N ± 5 N, there shall be no permanent deformation or damage, and the sealing performance shall comply with the requirements of 7.9.1.

7.4.2 Rotary angle valve

Carry out the test according to 8.4.2. After withstanding a torque of 4.0 N·m ± 0.5 N·m, no part of the valve body shall be permanently deformed or damaged, and the sealing performance shall comply with the requirements of 7.9.1.