Reason why valves are harder to open and close at high pressure than at low pressure
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Under high pressure, it is more difficult to open and close a valve even when the pressures on both sides are equal, compared to when the pressure is low. Isn’t it usually the pressure difference across the valve that makes it difficult to open and close it? Why is it still difficult to turn on and off in high-pressure water when the pressure difference before and after is the same under high pressure?
Pressure is applied to the valve from both sides, as if two hands are holding the valve flap
Both A and B had 10,000 yuan in their pockets. A bought an iPhone 8 without hesitation, while B hesitated for a long time before deciding not to buy one. Why? Because A is a billionaire and doesn’t care about those 10,000 yuan, B’s family has no money and relies on that 10,000 yuan to make ends meet. When operating a valve, it is not only necessary to consider whether the pressure difference before and after is the same; the level of pressure also plays a role, following the same principle.
Check whether pressure-relief measures have been taken in its internal structure
The opening force is related to the product of the pressure difference and the cross-sectional area of the pipe; a larger pressure difference requires a greater opening force