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1. For the safety valve with recoil plate and seat ring structure, adjust the seat ring. First of all, unscrew the adjusting ring fixing screw, and then from the exposed screw hole into a tool such as a screwdriver, dial the gear teeth on the adjusting ring, so that the adjusting ring turns around. When the adjustment ring to the left counterclockwise rotation, its position increased, the discharge pressure and the seat back pressure will be reduced. Conversely, when the adjustment ring is rotated clockwise to the right, its position is lowered and both the discharge pressure and the seatback pressure are increased. Each adjustment, the adjustment ring rotation should not be too large (usually 2-3 tooth rotation can be). After each adjustment, the fixing screw should be screwed up so that the end is located in the groove between two teeth of the adjusting ring, so as to prevent the adjusting ring from rotating without generating radial pressure on the adjusting ring. For safety reasons, the dial should be adjusted before adjusting the pressure relief valve should be appropriate to reduce the pressure (generally should be less than 90% of the opening pressure) to prevent the valve suddenly opened in the adjustment, causing an accident. 2.For the safety valve with the structure of upper and lower adjusting rings (one adjusting ring on the guide sleeve and valve seat), the adjustment is more complex. The upper adjusting ring is used to change the angle at which the flowing medium is folded after being reflected on the lower side of the valve flap so as to change the magnitude of the fluid acting force so as to adjust the seat back pressure. When the upper adjusting ring is raised, the turning angle decreases and the fluid force decreases. As a result, the pressure of the seatback increases. Conversely, when lowering the upper adjustment ring, the seatback pressure is reduced. Of course, the upper adjusting ring changes the back seat pressure, but also affects the discharge pressure, that is, raising the upper adjusting ring to increase the discharge pressure and reducing the upper adjusting ring to reduce the discharge pressure, but the impact is not as good as Seat pressure so obvious. The lower adjusting ring is used to change the size of the passage between the valve flap and the adjusting ring so as to change the degree of accumulation of the medium in the cavity between the valve flap and the adjusting ring when the valve is initially opened. When the valve seat adjusting ring is raised, the degree of pressure build-up increases, so that the phase of valve opening is reduced and the sudden snap-on is reached quickly. Therefore, raising the seat ring can reduce the discharge pressure. It should be noted that the seat ring can not be raised too close to the valve flap too close. In that case, the leakage at the sealing surface may cause the valve to suddenly open prematurely, but because of the medium pressure is not enough to keep the valve in the open position, the valve flap then closed again, so the valve frequency hopping. Seat adjustment ring is mainly used to reduce the valve ratio, open the stage and adjust the discharge pressure, but also have an impact on the seatback pressure.
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