the relief valve installation requirements: all containers ( Including the tower) Safety valve, it is better to install on the opening of the container, if you have difficulty, are connected to the container should be packed in export and as close as possible to the container of the pipe, the pipe sectional area should be no less than the sectional area of the relief valve inlet pipe.

the relief valve installation direction should make medium by the disc of the upper. Process equipment and piping of the relief valve should be installed vertically, and check the verticality of the stem, a deflection must be correct, in order to make sure the container or pipe between the safety valve and unimpeded. Leveraged the relief valve should be keep leverage levels. Relief valve position near the platform, as far as possible in order to facilitate inspection and maintenance. The tower of the relief valve should be installed in the top of the tower, commonly important equipment or piping two relief valve should be installed.

in general, the before and after the relief valve are not installed cut-off valve, to ensure safe and reliable. But in some cases, such as discharge medium containing solid impurities, so that the safety valve and jump, when they can no longer be locked after can be installed to cut off the valve, but should ensure that the valve in the fully open position, and add seal to prevent others to touch. Such as cut off valve, for the atmosphere of the relief valve alone, should be installed at the entrance of the maintain regular open with a shut-off valve seal; For into the closed system or use the manifold the atmosphere of the relief valve, should be in its inlet and outlet and a keep

often open and cut-off valve with a seal. Cut-off valve should choose rising stem gate valve, ball valve or sealing better plug valve, in order to reduce resistance. In addition, should also be between cut-off valve and relief Industrial Valves installed a general atmosphere of 3/4 'check valve.

the relief valve of imports and exports respectively in high pressure and low pressure sides, so the connecting flange is the same with different pressure levels, such as table 2 6.

when medium through the relief valve discharge, the pressure is reduced, volume expansion, the velocity increases, the reason of the relief valve outlet size is greater than the imported sizes. For micro and safety valve, the export size can be equal to import size, this is because of the small displacement, are commonly used in liquid medium. While all safety valve of large displacement, used in gas medium, so its export size usually larger than the nominal size. Size according to table 2 - imports Choose

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the relief valve should be sensitive enough, when to open pressure, should be no obstacles to open; When reach the discharge pressure, valve should be opened entirely, and achieve the rated capacity, when the pressure to the back seat, the valve should be closed in time, and keep the seal. The relief valve pressure shall conform to table 2 - The provisions of the eight.

when installing two relief valve, one for control of the relief valve; Another for work safety valve. Control valve opening pressure should be slightly lower than work safety valve opening pressure, in order to avoid too much at the same time open two relief valve and make the displacement.

according to the standard stipulated: carbon steel and alloy steel load safety valve directly apply to no greater than PN420, no more than 6 working conditions. Mainly used for water, steam, oil, ammonia, oil medium, etc. Made of carbon steel valve used in medium temperature ts425 ℃, relief valve used in media made of stainless steel and alloy steel temperature t≤ 600℃。

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