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5, in order to ensure that the opening pressure value is accurate, should make the adjustment of the media conditions, such as the media type, temperature, etc. as close to the actual operating conditions. The type of media changes, especially when the state of media accumulation is different (for example, from liquid phase to gas phase), the opening pressure often changes. As the operating temperature increases, the cracking pressure generally decreases. Therefore, when used at high temperatures for adjustment at room temperature, the setting pressure at room temperature should be slightly higher than the required opening pressure. The degree to which it is high is related to the choice of valve structure and material, and should be based on the manufacturer's instructions. 6. When the conventional safety valve is used to fix additional back pressure, when the opening pressure is adjusted after inspection (in this case the back pressure is atmospheric pressure), the setting value shall be the required opening pressure value minus the additional back pressure value. (2) Adjustment of discharge pressure and return pressure: 1. To adjust the valve discharge pressure and return seat pressure, the valve must reach the full opening height. Therefore, only the large-capacity test device or the safety valve is installed. It may not be possible until after being protected. The adjustment method differs depending on the valve structure. 2. For a structure with a reel plate and a seat ring adjustment ring, adjustment is made using a seat ring adjustment ring. Unscrew the adjusting ring fixing screw, and extend a tool such as a thin iron bar from the exposed screw hole to move the adjusting ring's teeth to turn the adjusting ring to the left or right. When the adjustment ring is rotated counterclockwise to the left, its position is increased, and the discharge pressure and the return pressure will be reduced. Conversely, when the adjusting ring is rotated clockwise to the right, its position is lowered, and both the discharge pressure and the return pressure are increased. Each adjustment, adjustment: The rotation of the circle should not be too large (general rotation number can be). After each adjustment, the fixing screw should be screwed in so that its end is located in the groove between the two teeth of the adjusting ring, which not only prevents the adjusting ring from rotating but also does not generate radial pressure on the adjusting ring. For safety reasons, before the adjustment ring is toggled, the inlet pressure of the safety valve should be properly reduced (generally lower than 90% of the opening pressure) to prevent the valve from being suddenly opened during the adjustment and causing an accident. 3, for the structure with upper and lower adjusting ring (each with a regulating ring on the guide sleeve and valve seat), its adjustment should be more complicated. The seat adjustment ring is used to change the size of the passage between the valve flap and the adjusting ring, thereby changing the degree of accumulation of pressure between the valve flap and the adjusting ring when the valve is initially opened. When the valve seat adjustment ring is raised, the degree of pressure build-up increases, so that the phase of the valve opening is reduced and the sudden rapid opening is reached quickly. Therefore, raising the seat adjustment ring can reduce the discharge pressure. It should be noted that the seat adjustment ring must not be raised too close to the valve flap. In that case, a leak at the sealing surface may cause the valve to open abruptly prematurely, but since the medium pressure is not enough to hold the valve flap in the open position, the valve flap closes and the valve jumps. Seat Adjustment: "The ring is mainly used to reduce the valve ratio, open the stage and adjust the discharge pressure, but also affect the return pressure. The upper adjusting ring is used to change the angle of the flow medium after it is reflected on the lower side of the valve flap, so as to change the force of the fluid, so as to adjust the return pressure. When the upper adjusting ring is raised, the folding angle is reduced and the fluid force is reduced accordingly, thereby increasing the pressure of the return seat. Conversely, when the upper adjustment ring is lowered, the return pressure decreases. Of course, when the upper adjusting ring changes the pressure of the return seat, it also affects the discharge pressure. That is, raising the upper adjusting ring increases the discharge pressure, lowering the upper adjusting ring reduces the discharge pressure, but the effect is not as good as Seat pressure is as obvious. (3) Sealing: After the safety valve is adjusted, it should be sealed to prevent any changes to the adjusted condition. When refitting the safety valve, the positions of the adjusting screw and the adjusting ring should be noted before disassembling the valve to facilitate the adjustment work after trimming. After re-adjustment, it should be sealed again.
(1) Adjustment of opening pressure: 1. Before the safety valve is delivered from the factory, the opening pressure should be adjusted to the user's required setting value. If the user proposes a spring working pressure level, the factory should generally be adjusted according to the lower limit of the pressure level. 2. Before the user installs the safety valve on the protected equipment or before installation, it must be adjusted again at the installation site to ensure that the set pressure value of the safety valve meets the requirements. 3. Within the spring working pressure range specified on the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression amount. 4. Before rotating the adjusting screw, the inlet pressure of the valve should be reduced to less than 90% of the opening pressure to prevent the valve flap from being rotated when rotating the adjusting screw so as to damage the sealing surface.