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In the need of high-pressure liquid, while the need for the second high-pressure liquid hydraulic system, often using pressure reducing valve to provide sub-high pressure liquid. D-JF1 valve with reliable action, pressure regulator convenient and flexible, stable and other outstanding advantages. 1. Working principle D-JF1 pressure reducing valve is composed of valve body, valve core, valve seat, piston, safety valve, adjusting screw, accumulator, guide sleeve, pressure ring and filter. Seat and piston slide up and down. D-JF1 valve works: the use of valve seat and seat clearance throttling, the output pressure is lower than the input pressure; the same time, the output pressure feedback, acting on the piston, forming a dynamic balance with the gas spring force, automatic control valve The clearance between the core and the valve seat keeps the output pressure constant. In the course of work, the hydraulic pressure changes, the piston will instantly change the force state, the piston was forced to lift. The resultant force of the valve core is always upward, so that the valve core moves up and down with the piston at the same time until a new equilibrium position is reached, thereby keeping the pressure regulating value constant. Accumulator pre-filled with a certain pressure of nitrogen for gas springs. Use adjusting screws to change accumulator pressure to achieve pressure regulation on D-JF1 relief valve. Slowly open into the liquid side of the screw, high pressure liquid into the lower part of the accumulator, nitrogen is compressed, the pressure increases, the piston down, the valve slit increases, throttling effect weakened, the outlet pressure increases; the other hand, open the liquid side of the screw, Liquid reduction, pressure drop, the piston up, the outlet pressure decreases. 2. Existing problems and improvements (1) Accumulator leaky accumulator into the water, if the bubbles in the water that is found accumulator leaks, most of them are caused by poor sealing of the inflatable valve. D-JF1 pressure reducing valve Accumulator valve with a M8 M6 socket head cap screws, the thread along the long cut a flat surface, with a combination of gaskets to seal, this structure is simple but easy to leak, inflatable seal And check the gas pressure need special tools. (2) adjusting screw leakage D-JF1 valve is a cone valve. Due to its structural and manufacturing reasons it is difficult to shut it off without leakage. Modified with a ball seal, the effect is very good. (3) Pistons Pistons in the highest position in the outer cylinder with the piston sleeve with the upper part of the inner hole, there are 2 holes, the inner bore after drilling burr, resulting in the piston guide sleeve in the crack card, so that the output flow and The pressure is low and can not meet the requirements. A better approach is to add an undercut groove there to remove the burrs leading to the inside of the upper two holes in the sleeve hole. (4) Outer ring guide O-ring easily cut the original design of the body and the guide sleeve seal is O-ring set in the body bore, for ease of processing, is located in the guide sleeve, but the body hole No 20 ° chamfer, resulting in the assembly of O-ring easily cut. 3 common faults and troubleshooting (1) not decompression ①pressure is too high, check and inflated to 2.5 ~ 4.5MPa; ② left the adjustment screw leakage, repair the connection hole hole at the bottom of the cone; ③ valve opening too Large, piston crack in the lowest card, piston and guide sleeve with different heart, polished with the step hole. (2) the outlet pressure is too low, can not be adjusted ①accumulator leaks. Check and inflated to the specified value; ② right adjustment screw leakage. Repair the connection hole at the bottom of the cone hole; ③ valve opening is too small, the piston is bad in the highest bit. Remove the guide sleeve, polished with the step hole. (3) the outlet pressure fluctuations, unstable ①accumulator leak, check and inflated to the specified value; ② left and right side of the adjustment screw seal is poor, repair the connection hole at the bottom of the cone hole. 4. Precautions Pay attention to the following two points when applying daily: (1) Regularly clean the filter; (2) Periodically check the accumulator gas pressure and inflate to the specified value.