Product Introduction

Rotary coupling also called as Rotary joint or Center joint is designed for supplying high pressure oil from stationary member to rotating member. Rotary coupling being a hydraulic element and used in earth moving and material handling equipments, its weight has to be as light as possible while being able to withstand the pressure load and frictional torque load which are cyclic in nature. 

The design needs to be sound and reliable and pressure drop has to be minimum while optimizing the section thickness and flow paths. 

Rotary coupling is mounted on under carriage of an excavator and when the upper carriage rotates, through a driving mechanism the axle drive pin will get the rotational force / torque. Axle along with input hoses also rotates with reference to coupling axis. This avoids twisting of hoses. 

Rotary coupling is used to provide oil supply to all hydraulic elements like cylinder, hydraulic motors etc which are mounted below the under carriage. 
In case of rotary coupling the outer body can be rotating element or it can also be stationary. Rotary coupling can have any number of ports depending upon the requirement of the application and it can handle different types of fluids such as air, brake fluid, hydraulic oil etc.

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Work shop 

About dorson

Shandong Dorson Hydraulic Co.,ltd (former name Jining Automobile Spare Parts Co.,ltd, established in 1956) which developed into private joint-stock company that specialized in producing the excavator parts including idler cushion, front idler, sprocket, track roller, carrier roller, rotary joints, hydraulic redirector, cycloid motor, one-piece multi-way valve, central rotary joints since 1998. 

Shandong Dorson Hydraulic Co., ltd adhere to the principle that“winning the market with our sincerity, meeting the challenge with our quality, broadening the market with our service” We are dedicated to revitalizing this national industry. 

Our company have successively produced the excavator parts idler cushion assy, front idler assy ,sprocket assy ,track roller assy, carrier roller assy, central rotary joints that covers many types like PC400,PC300,PC220,PC200,PC130-7,PC120,PC60,JCM230,JCM210,CT40,CT18,ZE60,ZE205,ZE230,ZE80 and so on which entrusted by famous brand such as SHANTUI,ZOOMLION,SANY,LISHIDE,CATER,WORLD GROUP,FORD,CARGOTEC,LOVOL,STRONG etc. Now developed the key hydraulic device which used by construction machinery such as central rotary joints,heavy flowing high pressure multifunctional valve for Excavator, Crane, Bulldozer, Loader etc.

Dorson Hydraulic Co., ltd always Adhere to 6S management, the full implementation of TQM, equipped with ERP system since the date of Foundation. the adoptions of the production works streamlines &details management ensure each products and its production process could traceability. we pursue the management of Customer is superior, Service is supreme and we could solve the problems that provided by the customers with abundant users report management and professional after-sales service engineers.