GB 12255-89 General Valve Iron Stop Valve and Rising Check Valve
This standard isGB12255-89 general valve iron stop valve and rising check valve (announcement), formulated by China Supplies and Material State Administration. This standard applies to threaded iron stop valve and rising check valves used in various industrial and chemical sectors in the Peoples Republic ofChina.
1 Product and Model
The product and model specifications of the general valve iron stop valve and rising check valve mentioned in this standard are shown in Table 1.
2 Dimensions and Materials
The nominal size, pressure in different service conditions, connecting dimensions, sealing materials and other parameters of the general valve iron stop valve and rising check valve mentioned in this standard are shown in Table 2.
3 Weight and Design
The weight and design of general valve iron stop valve and rising check valve mentioned in this standard are shown in Table 3. The materials used for general valve iron stop valve and rising check valve are shown in Table 4.
4 Technical Requirements
The flange opening of the general valve iron stop valve and rising check valve should be smooth and smooth. The edges should be clean and free of burrs. The surface of the flange should be free of dust, oil and other debris. It is allowed to use a bibb wiper to blacken the surface of the flange.
The surface of the general valve iron stop valve and rising check valve should be free of sags, tears, pits, bumps, delamination, etc.
In addition, the general valve iron stop valve and rising check valve should be equipped with a static seal test and pressure test device. The static seal test device should be able to independently test the static sealing performance of the valve. The pressure test device should be able to independently test the pressure relief effect of the valve.
5 Quality Requirements
The quality requirements of the general valve iron stop valve and rising check valve mentioned in this standard are shown in Table 5.
Including：the valve body should be smooth and clean, without weld joint defects; the valve gate should have no wear marks, without bumps; the sealing surface of the valve gate and seat should be smooth, without scratches, and the flatness should be consistent with the requirements; the valve stem should not be easy to fall off, no cracks and defects.
6 Marking and Packing
The marking and packing of the general valve iron stop valve and rising check valve mentioned in this standard are shown in Table 6.
The marking of the general valve iron stop valve and rising check valve should include the following information: product series name, nominal diameter, pressure, working temperature, shell test pressure, total length, manufacturer, etc. The packing of the general valve iron stop valve and rising check valve should meet the requirements of environmental protection, moisture-proof and corrosion-proof.
7 Transport, Storage and Maintenance
The transportation, storage and maintenance of the general valve iron stop valves and rising check valves should meet the requirements of environmental protection, moisture-proof and corrosion-proof.
The general valve iron stop valves and rising check valves should be transported in a stable manner to prevent collisions. The lifting should be cautious to prevent damage to the valve body.
The general valve iron stop valves and rising check valves should be stored in a dry, ventilated place to prevent moisture and corrosion.
The general valve iron stop valves and rising check valves should be subjected to regular inspection and maintenance. The lubrication should be carried out in accordance with the specification requirements. The moving parts should be inspected and the tightness should be adjusted. Leaking valves should be tightened, and defected valves should be repaired in time.
Conclusion
This standard applies to threaded iron stop valve and rising check valves used in various industrial and chemical sectors in the Peoples Republic of China. The product and model specifications, dimensions and materials, weight and design, technical requirements, quality requirements, marking and packing, transportation, storage and maintenance of the general valve iron stop valve and the rising check valve are all specified in this standard. In order to ensure the safe and reliable operation of the general valve iron stop valve and the rising check valve, users should abide by this standard and carry out regular inspection and maintenance.
