Model of flat gate valves for oil depots
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May I ask how to write the model number for the flat gate valve that serves as the first valve in an oil tank at an oil depot? Rigid seal or soft seal? Single gate or double gate? Are there any flow guide holes? Is the design standard JB/T5298-91? Why is the design temperature in the standard only 121? Thank you very much! ! !
Is the operating temperature of 121°C related to the valve packing and O-rings?
I stumbled upon your post today by chance, so I’ll say something: we mainly specialize in flat gate valves, and many of the standards were drafted with the involvement of our boss. To understand a model, one must first comprehend what it represents. For example: KZ543WF-16C, which indicates a nominal pressure of 1.6 MPa, bevel gear drive (code 5), flange connection (code 4), no flow guide holes (code W; these are not indicated when present), a straight-stem parallel single-disc gate valve (code 3; double discs use code 4). The valve body is made of WCB, while the sealing surface is made of reinforced polytetrafluoroethylene (code F). Oil storage tanks generally use soft seals; since I’m not aware of your operating methods, I’ll assume manual operation for now. A flow guide hole is likely not necessary. Assuming a DN200 size and normal pressure conditions, the appropriate model would be Z43WF-16C. The force with which the gate is pressed against the valve seat is controlled by the medium pressure acting on the floating gate or the floating valve seat. In the case of a double-plate gate valve, the separating mechanism between the two gates can provide this compressive force. Selection principles for flat gate valves: 1. For pipelines used in the transportation of oil and natural gas, flat gate valves with a single gate or a double gate should be chosen. For cleaning pipelines, select a straight-stem flat gate valve with a single or double gate and guide holes. 2. For the pipelines and storage equipment used for transporting finished oil, flat gate valves with a single or double gate and no guide holes should be selected. 3. For wellhead equipment used in the extraction of oil and natural gas, flat-plate gate valves with a floating stem and valve seats equipped with flow guide holes, either single or double gate types, are used; these valves generally comply with the API16A standard, with pressure ratings of API2000, API3000, API5000, API10000, API15000, and API20000. 4. For pipelines with suspended particulate media, knife-type flat gate valves should be used. 5. For urban gas transmission pipelines, single-plate or double-plate soft-seal straight-through flat gate valves should be used. 6. For urban water supply systems, single-plate or double-plate flat gate valves without guide posts are used.
The design standards are correct: JB/T5298-1991 and GB/T 19672-2005, which are related to temperature and the sealing surface.
It seems I arrived at the forum too late; even after seeing it, I still wanted to come in and write something. The temperature requirement isn’t high because the seat of the flat gate valve is floating, with an O-ring behind it. Since the O-ring is made of rubber, it can’t withstand high temperatures. Flat gate valves are mainly used in oil depots and natural gas pipelines, where the temperatures aren’t high. However, we now have flat gate valves that are suitable for high-temperature environments.