API Forged steel globe valve
Connection type: Socket welding, Butt welding, Flange
Operation: Hand wheel
Working Medium: Water, gas, oil, Acid and alkali
Working Temperature: -29℃≤T≤425℃
Designed by: API 620、BS5352
Face to face: ASME B16.10
Flange End: ASME B16.5
Testing and inspection: API 598
In the process of opening and closing, the friction force between disc and valve body sealing surface is smaller than that of gate valve, so it is resistant to wear. Generally, the opening height is only 1 / 4 of the valve seat channel diameter, so it is much smaller than the gate valve. Generally, there is only one sealing surface on the valve body and disc, so the manufacturing process is better and the maintenance is easy. Applicable temperature: – 196 ℃ ~ 700 ℃ driving mode: manual, bevel gear drive, pneumatic, electric, hydraulic, pneumatic, electro-hydraulic valve body material: WCB, zg1cr18ni9ti, zg1cr18ni12mo2ti, CF8 (304), CF3 (304L), CF8M (316), cf3m (316L), Ti. Different materials can be used in water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.
The selection principles are as follows:
1. The stop valve should be selected on the pipeline or device with high temperature and high pressure medium. Such as thermal power plant, nuclear power plant, petrochemical system of high temperature, high pressure pipeline.
2. On the pipeline where the flow resistance requirement is not strict. That is, the pressure loss is not considered much.
3. Small valve can choose needle valve, instrument valve, sampling valve, pressure gauge valve, etc.
4. There is flow regulation or pressure regulation, but the regulation accuracy is not high, and the pipeline diameter is relatively small, such as the nominal diameter ≤ 50mm pipeline, it should be selected.
5. High pressure angle globe valve or high pressure angle throttle valve with nominal pressure of pn160, nominal pressure of 16MPa or pn320 and nominal pressure of 32Mpa should be selected for small and large chemical fertilizers in synthetic industry.
6. In the desilication workshop and coking pipeline of alumina Bayer process, it is easy to select the DC stop valve or DC throttle valve with separated valve body, removable valve seat and cemented carbide sealing pair.
7. In the water supply and heat supply projects in urban construction, the stop valve, balance valve or plunger valve can be selected for the pipeline with smaller nominal diameter, such as the pipeline with the nominal diameter less than 150 mm .