The first is the main body (2) damper blocked, hydraulic maintenance price, not the main valve on the hydraulic transfer chamber and the front chamber of the pilot valve, the pilot valve will lose regulation of the main valve pressure. Because the main valve chamber no oil pressure, hydraulic maintenance offer, the spring force is very small, so the main valve spring force into a small direct-acting relief valve, Weinan hydraulic maintenance, pressure in the inlet chamber is under low, the main valve is opened overflow, the system can not be established pressure. Plating Technology: a layer of hard chrome plated plunger; brush plating technology: Brush the surface of the plunger resistant materials; thermal spraying or electric arc spraying or spray: Spray carbon martensite wear-resistant materials; laser cladding : The surface of the plunger cladding alloy powder by high hardness. Hydraulic maintenance organization, Xi'an Chengtong hydraulic maintenance, repair and maintenance of hydraulic Xi'an by the Xi'an Chengtong hydraulic maintenance Limited. Xi'an-hydraulic-repair Ltd. (www.huosu360.com) is Xi'an, industrial maintenance, installation of leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Xi'an Chengtong hydraulic service leadership with the staff warmly welcome all inquiries negotiations to create Xi'an Chengtong hydraulic service better future.