Based on the pressure relief valve closed circuits roller hydraulic relief maintenance Which, when the piston pressure drop, a is the pressure side, b is suction side, so the decline in the valve opening roller hydraulic repair, while the slide valve is closed . Pressure relief valve does not work. After work roller hydraulic maintenance organizations, pump commutation, b into the pressure side of the pump maintenance force to overcome the spring force of the slide valve spool moves to the left, turn on the paths. So on the cylinder chamber through a, 1,4 and 7 relief throttle, while also helping pump suction pressure relief. Relief speed from 7 to adjust the throttle. Hydraulic spool valve repair using the K-type electro-hydraulic valve pressure relief function as shown in Figure 6-32, when 1DT energized, pressure oil through a three-way electro-hydraulic valve into the upper chamber of the master cylinder squeeze When the pressure rises to a predetermined pressure, pressure gauge sender 2 roller hydraulic repair company, by the time delay relay packing. After packing, 1DT power failure, the valve is switched to a delay in its median brought damper control, high-pressure oil will move with K-type valve, the opening gradually increase the amount of small to large, high pressure oil also steeled gradual release. When the valve is moved fully in place, most of the energy has been released high-pressure oil, so "gun sound" is greatly reduced. How to repair a hydraulic roller, roller Yulin hydraulic repair, hydraulic repair Chengtong Xi'an Xi'an Chengtong hydraulic repair Limited. Xi'an Chengtong Hydraulic Maintenance Co. (www.huosu360.com) strong, credible, in Xi'an, industrial maintenance, installation and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Xi'an-hydraulic service and you work through into the brilliant, for a better future!