Home> Industry Information> Pressure relief valve (safety valve) common faults and causes

Pressure relief valve (safety valve) common faults and causes

May 09, 2019

1. Leakage of the valve? Under the normal working pressure of the equipment, the valve flap and valve seat sealing surface occur more than the allowable degree of leakage, and the leakage of the Relief Valve (safety valve) will not only cause the loss of the medium. In addition, the continuous leakage of media will make the hard sealing material is damaged, but the sealing surface of the commonly used Pressure Relief Valve are metal materials on the metal material, although strive to make it smooth and neat, but under medium pressure To be absolutely leak is also very difficult. Therefore, the working medium is a steam safety valve, at the specified pressure value, if the naked eye at the exit can not see the leak, it is considered the sealing performance is acceptable. Common causes of valve leakage mainly in the following three cases: The first case is: dirt impurities fall on the sealing surface, the sealing surface pad, resulting in a gap between the valve core and the valve seat, so the valve leakage. To eliminate this failure is to remove dirt and impurities falling onto the sealing surface, the general size of the boiler to be shut down when the repair, the first to do security gate running test, if the leak was found to be decommissioned maintenance .If it is Point furnace runner test run leak found security gate, it is estimated that this situation caused by the runner can be cooled after 20 minutes and then ran rudder, the sealing surface erosion. The second case is the sealing surface damage. Seal surface damage caused by the following main reasons: First, poor sealing surface material. Currently using YST103 common steel welding rod sealing surface sealing effect is better. Second, the poor quality of maintenance, valve seat grinding can not meet the quality standards, the way to eliminate this failure is based on the degree of injury using grinding or turning grinding method to repair the sealing surface. The third type of relief valve leakage is due to improper assembly or inappropriate parts dimensions. In the assembly process, the valve seat is not fully aligned or the surface with light transmission phenomenon, or the valve seat sealing surface is too wide, which is not conducive to sealing. Elimination method is to check the spool around the size and uniformity of the gap to ensure that the valve tip hole and the sealing surface with a positive, check the Ministry of the gap does not allow the lift valve; . 2. The valve body surface leakage refers to the upper and lower valve body surface leakage at the junction, resulting in leakage of the main reasons for the following aspects: First, the binding surface of the bolt tension is not enough or tight bias, resulting in Poor sealing surface. Elimination method is to adjust the bolt tightness, the tight bolt must be diagonally tight manner, it is best to measure the tightness around the gap, the bolt tight so far, and the junction of the gap around Consistent. The second is: the tooth surface of the valve body gasket does not meet the standard. For example, the radial seal groove slightly grooved, poor parallelism, tip too sharp or over-the-slope and other defects can cause seal failure. So that the valve body surface leakage. In the maintenance of good spare parts quality, the use of standard toothed gaskets can avoid this phenomenon. Third: the flatness of the valve body with the poor surface or hard impurities caused by gasket failure seal. The valve body due to the flatness of the joint surface caused by poor bonding surface leakage, the elimination of the valve is to disintegrate the valve to re-ground the joint until the quality standards. As a result of impurities caused by gasket failure seal in the valve assembly carefully clean the surface to avoid impurities fall into. Main relief valve (safety valve) does not move after the impulse safety valve is actuated This behavior is often referred to as the main safety gate's reflex action.

The above is the Pressure relief valve (safety valve) common faults and causes we have listed for you. You can submit the following form to obtain more industry information we provide for you.

You can visit our website or contact us, and we will provide the latest consultation and solutions

Share to:

Send Inquiry

Home> Industry Information> Pressure relief valve (safety valve) common faults and causes
Related Products List

Home

Product

Whatsapp

About Us

Inquiry

We will contact you immediately

Fill in more information so that we can get in touch with you faster

Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.

Send