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What type of flanges should be used for a flanged gate valve with a hidden stem?
Flanged gate valves with concealed stems usually require the use of flanges that comply with relevant standards to ensure the sealing performance and reliability of the connection. When making a selection, factors such as the nominal pressure, diameter of the valve, flange standards, and the medium being used must be taken into account. Taking the commonly used American-standard gate valves with concealed stems as an example, their flange dimensions comply with the ANSI B16.1 standard, and the nominal pressure rating is 125 pounds. Therefore, flanges that meet the ANSI B16.1 standard, such as those with a 125-pound rating, should be used.
These types of flanges typically use a raised face (RF) sealing design and are suitable for use with media such as water, oil, and gas.
For gate valves with concealed stems that comply with other standards, such as Chinese or Japanese standards, the selection of flanges must correspond to those standards:
- **Chinese-standard gate valves with concealed stems**: The flange dimensions follow standards such as GB/T 9112-9131. Chinese-standard flanges (such as those with PN10 or PN16 pressure ratings) should be used, and the sealing surface can be either raised face (RF) or male and female face (MF).
- **Japanese-standard gate valves with concealed stems**: The flange standard is JIS B2201, and Japanese-standard flanges must be used; the sealing surface is usually raised face (RF).
**Points to consider when selecting**:
- **Pressure rating matching**: The nominal pressure of the flange should be equal to or higher than that of the valve. For example, if the valve has a pressure rating of 125 pounds, the flange should also have a 125-pound rating or higher.
- **Sealing surface type**: Common sealing surfaces include raised face (RF) and male and female face (MF). The sealing surface of the flange must match that of the valve. For instance, American-standard flanges often use a raised face, while high-pressure valves may use a ring joint face (RJ).
- **Material compatibility**: The material of the flange should be compatible with that of the valve (such as cast iron or stainless steel) to prevent electrochemical corrosion. Common flange materials include carbon steel (such as 20-gauge steel) and stainless steel (such as 304 or 316).
- **Gasket selection**: Sealing gaskets (such as rubber or metal gaskets) are required for flange connections. The material of the gasket should be chosen based on the temperature and pressure of the medium. For example, nitrile rubber is suitable for use with oil, while ethylene propylene diene monomer rubber can withstand high temperatures.
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