Core Technical Performance Characteristics of Valves
The technical performance of a valve directly affects its operational quality and safety within a piping system. This is primarily reflected in the following six aspects:
1. Strength Performance
This refers to the valve's ability to withstand the pressure of the medium. As a product subjected to internal pressure, a valve must possess sufficient strength and rigidity to ensure it does not rupture or deform during long-term use.
2. Sealing Performance Ball Valves
This is the most crucial technical indicator of a valve. It refers to the ability of the valve's sealing parts to prevent medium leakage. The main sealing areas include: the contact point between the closing member and the valve seat (internal leakage, commonly known as not closing tightly), the fit between the packing and the valve stem, and the connection between the valve body and the bonnet (the latter two are collectively referred to as external leakage). For shut-off valves, internal leakage is not permissible. External leakage not only results in loss of the medium but can also pollute the environment and even lead to safety accidents.Ball Valve News
3. Flow Performance
When the medium flows through a valve, it experiences a pressure drop (i.e., the pressure difference between the valve inlet and outlet). This means the valve creates a certain resistance to the flow. To conserve energy, this resistance should be minimized as much as possible during the design and manufacturing process to reduce energy consumption.
4. Operational Performance
This refers to the sensitivity and reliability of the valve's response to changes in medium parameters. For valves with regulating or specific functions, such as throttle valves, pressure reducing valves, and safety valves, operational sensitivity and reliability are critically important.
5. Operating Force and Operating Torque
These refer to the force or torque that must be applied to open or close a valve. When closing a valve, it is necessary to overcome various resistances, including friction between the sealing surfaces, friction between the stem and the packing, and friction in the stem nut threads. The maximum value is typically encountered at the final moment of closing or the initial moment of opening.
6. Operating Speed
This is expressed by the time required for the valve to complete one opening or closing action. Generally, there are no strict requirements for operating speed under normal conditions. However, some special applications require rapid opening or closing to prevent accidents, or require slow closing to prevent water hammer.
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