Content Guide: Under the normal working pressure of the equipment, the leakage between the valve disc and the seat sealing surface exceeds the allowable degree. The reason is that there is dirt between the valve flap and the sealing surface of the valve seat. The valve can be opened several times with a lifting wrench to flush the dirt; the sealing surface is damaged. It should be repaired by grinding or turning after grinding according to the degree of damage; the stem is bent, tilted or the lever and the fulcrum are skewed, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; the spring elasticity is reduced or loses its elasticity. Measures such as changing the spring and re-adjusting the opening pressure should be taken.
Disclosure
Under normal working pressure of the device, a leak occurs beyond the allowable degree between the valve flap and the seat sealing surface. The reason is that there is dirt between the valve flap and the sealing surface of the valve seat. The valve can be opened several times with a lifting wrench to flush the dirt; the sealing surface is damaged. It should be repaired by grinding or turning after grinding according to the degree of damage; the stem is bent, tilted or the lever and the fulcrum are skewed, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; the spring elasticity is reduced or loses its elasticity. Measures such as changing the spring and re-adjusting the opening pressure should be taken.
2. The flap frequency or vibration is mainly due to the spring stiffness being too large. Should use the appropriate stiffness of the spring; improper adjustment of the conditioning ring, so that the return pressure is too high. The position of the conditioning ring should be re-adjusted; the resistance of the discharge pipe is too large, which constitutes an excessive discharge back pressure. The discharge pipe resistance should be reduced.
3. The reason for not opening to the regular pressure is that the pressure is not accurate. The amount of spring compression or the position of the weight should be readjusted; the disc is stuck to the seat. The safety valve should be manually deflated or drained periodically; the lever of the lever safety valve is stuck or the weight is moved. The weight position should be re-adjusted and the lever moved freely.
4. After the discharge, the valve flap does not return to the seat. This is mainly caused by the spring-bending valve stem and the valve disc installation position is not correct or stuck. Should be reassembled.
5. The pressure continues to rise after exhausting. This is mainly due to the safety relief volume of the selected safety valve displacement device. The suitable safety valve should be re-selected; the stem center line is not correct or the spring is rusted, so that the valve flap cannot be opened to the proper The height should be reassembled or replaced by a spring; if the exhaust pipe is not adequately cut, an exhaust pipe that fits the safe discharge area should be adopted.
6. Less than the regular pressure opening is mainly the constant pressure; spring aging elastic force falls. The adjustment screw should be tightened properly or the spring should be changed.
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