spring-loaded safety valve

by:Lianke Valve     2022-09-25
1. Spring slightly open type safety valve Spring type safety valve fault analysis Spring type safety valve relies on the elastic pressure of the spring to lock the valve valve or plunger and other seals. Once the pressure of the pressure vessel is abnormal, the high pressure generated will Overcome the spring pressure of the safety valve, so the locking device is pushed open, forming a pressure relief channel to release the high pressure. In the process of daily use, some failures will also occur due to improper use or little maintenance. The following are specific maintenance methods for your reference only. 1. Leakage Under the normal working pressure of the equipment, leakage exceeding the allowable level occurs between the valve disc and the sealing surface of the valve seat. The reasons are: there is dirt between the valve disc and the sealing surface of the valve seat. The valve can be opened several times with a lift wrench to flush out the dirt; the sealing surface is damaged. It should be repaired by grinding or grinding after turning according to the degree of damage; the valve stem is bent, inclined or the lever and the fulcrum are deflected, so that the valve core and the valve disc are misaligned. Should be reassembled or replaced; spring reduced or lost elasticity. Measures such as replacing the spring and readjusting the opening pressure should be taken. 2. The frequency jump or vibration of the valve disc is mainly due to the excessive spring stiffness. A spring with appropriate stiffness should be used instead; improper adjustment of the adjusting ring will make the return pressure too high. The adjustment ring position should be re-adjusted; the resistance of the discharge pipe is too large, resulting in excessive discharge back pressure. The discharge line resistance should be reduced. 3. The reason for not opening when the specified pressure is reached is that the constant pressure is not allowed. The compression of the spring or the position of the weight should be readjusted; the disc is stuck to the seat. Manual air or water discharge tests should be performed on the safety valve regularly; the lever of the lever-type safety valve is stuck or the heavy hammer is moved. The weight should be repositioned and the lever moved freely. 4. The valve disc does not return to its seat after discharge. This is mainly caused by the spring bending the valve stem, the incorrect installation position of the valve disc or being stuck. Should be reassembled. 5. After exhausting, the pressure continues to rise. This is mainly because the safety valve of the selected safety valve has a small discharge capacity, and a suitable safety valve should be re-selected; the center line of the valve stem is not correct or the spring is rusted, so that the valve disc cannot be opened to its proper position. If the height is higher, the valve stem should be reassembled or the spring should be replaced; if the exhaust pipe is not enough, an exhaust pipe that meets the safe discharge area should be adopted. 6. It is mainly due to the inaccuracy of constant pressure when opening under the specified pressure; the elasticity of the spring decreases as it ages. The adjusting screw should be properly tightened or the spring should be replaced. If the spring-loaded safety valve you are using is faulty, we recommend that you report for repair in time so that it can be repaired as soon as possible. Installation points of spring-type safety valve For the installation of spring-type safety valve, we have a lot of places to pay attention to. The first thing to pay attention to is that before installing the safety valve, the sealing performance must be tested. If the safety valve leaks Or if the air cushion is damaged, it must be replaced immediately so that everyone can get the best use. In the process of installation, the first premise is that for all parts of the safety valve, everyone needs to pay attention to the use of vertical installation, the installation angle should be accurate and regular, and tools should be used for corresponding assistance, so that you can Effectively make installation smooth and effective. Secondly, when installing the spring-type safety valve, we should also remind everyone not to put pressure on the outlet of the safety valve. The best use effect, have a better user experience, and the installation is more in place. Another is that when carrying out safety, please pay attention to the operator's best to bring the corresponding gloves on the hands, so as to avoid oil pollution and other problems on the safety valve, which will affect the sealing effect of the safety valve, and it is also possible It will lose the service life of the entire safety valve and bring you the best help. Finally, I want to remind everyone that at least two operators must be present at the same time during the installation of the spring-loaded safety valve, and they cannot enter the state of use immediately after the installation is completed. Instead, an effective trial should be carried out first to ensure the safety valve. After it can work normally, it can be put into use.
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