Ball valve with drain hole
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In a certain project, the well-known patent holder xx Company recommended the use of ball valves with drain holes in the valve core, as shown in Figure 2. The diameter of these holes is usually 2–3 mm; their purpose is to prevent overpressure from occurring due to the decomposition of the fluid remaining in the valve core, which could otherwise damage the valve. How is a model number assigned to this ball valve with drain holes?
Determining the selection code usually requires taking into account the specific specifications of the ball valve as well as the relevant parameters of the drain hole. Generally, the model number includes information on the type of ball valve, its diameter, pressure rating, as well as any special features (such as a drain hole). For example: 1. **Type**: Ball valves can come in various types, such as floating ball valves and fixed ball valves. 2. **Bore size**: Indicates the diameter of the pipe to which the ball valve is connected. 3. **Pressure rating**: The maximum operating pressure that the ball valve can withstand. 4. **Special function indicators**: For example, “PW” can be used to indicate a special design with a drain hole. Assuming you choose a floating ball valve with a diameter of DN50 (50mm), a pressure rating of PN16 (1.6MPa), and a drain hole, its model number might be something like: “FBV-DN50-PN16-PW”. The specific numbers need to be determined based on the manufacturer’s product catalog and selection guide. It is recommended to consult the supplier or review relevant technical documents before selecting a specific model, to ensure that the chosen ball valve fully meets the project requirements. .
It is not a drain hole; the ball valve has a valve chamber pressure relief mechanism (pressure relief hole). Refer to GB24925—2019
This post was last edited by Clouds of flowing water shine on 2024-7-29 17:30: Side-mounted floating ball valve. How are numbers assigned in the pipeline grade table?
Such ball valves are generally designed as low-temperature ball valves; the relevant models cannot be specified, and technical specifications must be provided separately.
It should be the pressure relief hole of the valve under low-temperature operating conditions. Additionally, a diameter of 2-3 mm is prone to clogging under actual operating conditions; it is recommended to use a diameter of 6 mm or more
According to a company’s documentation: 3.13 Valves with a nominal diameter of 100 DN or greater shall be equipped with vents and drain pipes for the valve chamber. The drain pipe should have an opening at the bottom of the valve so that impurities within the valve can be removed, while the vent pipe should be installed with an opening at the top of the valve body to allow the valve chamber to be vented and cleaned. For valves installed underground, the vent ports, drain ports, and seal grease filling ports should extend to the ground level, with the interface height being 150 mm to 250 mm below the lower edge of the flange at the end of the extension rod. Valve suppliers need to consider the ease of cleaning the valve body itself; for valves installed above ground with a nominal diameter of 300 DN or larger, the cleaning pipeline for the valve body should be led outside the valve body. The vent pipe, drain pipe, and valve body shall be connected by welding. Both the vent and drain lines should be equipped with dual valves; the valve located closer to the valve body should be a welded ball valve, while at the end there should be a threaded vent valve or drain valve. The end of each line should be fitted with an elbow facing downward (with a plug).
It is also possible to write the technical requirements, or to include this item directly in the naming, but annotations should be provided.
Those with pressure relief holes may get clogged easily if the fluid flowing through them contains solid particles