1 opening pressure ( Setting pressure) Adjustment within the prescribed scope of work pressure, can adjust the screw through the rotating, change the amount of compression spring preload to adjust opening pressure. Down the valve cover cap, after the lock nut unscrewing, can adjust adjustment screw will first import pressure, make the valve jump time, if the opening pressure is low, then tighten the adjustment screw clockwise. If opening pressure on the high side, unscrew the counterclockwise direction. After the adjustment to the need of opening pressure, tighten lock nut, attaching the cover cap. If required by the opening pressure is beyond the spring pressure range, you will need to change another job stress range suitable spring, and then adjusted after the spring switch, should change the corresponding data on the nameplate. 2 when adjusting the opening pressure, the following points should be pay attention to: when the medium pressure close to opening pressure ( To reach more than 90% of the opening pressure) , turn adjusting screw should not, lest the disc spins, and damage the sealing surface. To guarantee the accuracy of the opening pressure value, with the conditions of media, such as medium type, medium temperature, should be as close as possible to the actual working conditions. Medium type change, especially from a liquid into a gas phase, the opening pressure often change. Working temperature rises, the opening pressure is reduced. Reason at room temperature adjustment and used in high temperature, the temperature of the set pressure value should be slightly bigger than the opening pressure value to the ball. 3 discharge pressure and back pressure adjustment opening pressure is good, if the discharge pressure or back pressure is not in conformity with the requirements, the regulation on the seat ring may be used to adjust. Unscrewed the adjusting ring fixed screw, from the exposed screw holes to insert a thin iron tools, such as can a dial to adjust the ring gear, make adjustment circle turn right or left. When adjusting the circle to the right make counterclockwise, its position, discharge pressure and back pressure will be reduced; Conversely, when making clockwise adjust the circle to the left, its location is reduced, discharge pressure and back pressure will be increased. Each time the adjustment, adjust the ring spinning amplitude shoulds not be too big ( Generally within 5 teeth) 。 Every after adjusting, it should be fixed screw, the screw end is located in the adjusting ring grooves between the two teeth, in order to prevent the adjustment ring rotation, but may not have the lateral pressure on the adjusting ring. Then the motion experiment was carried out. To be on the safe side, before the adjustment ring upon, should lower the inlet pressure relief valve properly ( General should be less than 90% of the opening pressure) When, in order to prevent the adjustment Industrial Valves suddenly open, accident. Must pay attention to the relief Industrial Valves discharge pressure and back pressure test, only when the air flow large enough to make the valve cannot open, To the relief valve rated emissions) Is possible. And is often used to check the relief valve opening pressure of the test bench capacity is very small, when the valve is unlikely to be fully open, the back pressure is also false. Will open in such a test bench calibration, in order to make the jump action obviously, the adjusting ring tone is usually placed in a higher position, but the actual operating conditions of valve which is not suitable, have to readjust the position of the adjusting ring. All 4 seal Industrial Valves after the adjustment, should carry on the seal, in order to prevent the change has been adjusted at will. Relief valve factory, except in the case of specified, usually with normal temperature air level according to the working pressure of upper limit ( The high pressure) To adjust the value. Therefore, users generally need to readjust according to the actual working conditions. And get back to seal.
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