The pressure relief valve is a safety valve. When the pressure exceeds the set value, it will automatically open and discharge the pressure to avoid equipment damage or even casualties caused by the pressure really exceeding the set value. The pressure relief valve controls the opening and closing of the valve through the force balance of the spring force and the pressure. We can better understand this safety valve by analyzing the valve action state.
1. Normal state: Under normal working conditions, the pressure relief valve is in a closed state and no pressure is released. At this time, the spring of the valve is in a compressed state, the spring force and the pressure are in a force balance, and the valve is naturally in a closed state.
2. Open state: Once the pressure exceeds the set value, the spring force cannot resist the pressure force, and the pressure relief valve will automatically open to discharge the pressure. In this state, the spring is in an extended state, and the pressure force controls the degree of opening of the valve.
3. Closed state: When the pressure drops below the set value again, the spring force can resist the pressure force again, and the valve automatically closes and returns to its normal state.
The above three action states of the pressure relief valve are all related to the working pressure and spring force. We need to keep an eye on it when using it to ensure that the valve setting value must match the working pressure to avoid misoperation or malfunction. When the pressure relief valve is opened, this state must also be maintained for a certain period of time to allow the pressure to be completely released. When there is a state switch, we must also make it clear whether the valve can be opened and closed normally, and if there is a leakage, we must solve the problem as soon as possible and do a good job of inspection and maintenance.
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