commonly used fittings can generally be divided into hard two kinds of fittings and hose fittings .

If we adopt the fittings and pipes are connected to points, hard pipe joint has flared , ferrule and welded three kinds of hose fittings are mainly withhold hose fittings .Hydraulic system pipes and fittings connections are also different, screwed into the end of the pipe connecting thread is used . Taper thread by virtue of their vertebral tighten and use substances such as PTFE sealing operation , mainly used in low-pressure hydraulic systems. Fine thread sealing effect is very good, is often used in high-pressure systems, but it requires the use of Hydraulic tube fittings  or O-ring to seal against the end of the work , sometimes used copper washers , it is more suitable for use in connecting wall relatively thick pipe , its components are joint body to take over and nuts. When in use, the connector body embedding target , with the use of the previously mentioned washers to seal the joint between the body and take over the rubber seal , sometimes using spherical sealing manner. Hydraulic system pipes and fittings Hydraulic adaptersHydraulic adapters , screwed into the end of the pipe connecting thread used . Taper thread by virtue of their vertebral tighten and use substances such as PTFE sealing operation , central air conditioning is mainly used in low-pressure hydraulic systems. Fine thread sealing effect is very good, is often used in high-pressure systems, but it requires the use of combination washer or O-ring to seal against the end of the work , sometimes used copper washers , due fittings are removable type connection element . More suitable for the connection of the pipe wall is thick , consisting mainly of local joint body to take over and nuts. When used, the connector body embedding target , with the use of the previously mentioned washers to seal the joint between the body and take over the rubber seal , sometimes using spherical sealing manner.Meet the normal connections are secure , sealing strong , reasonable size , pressure loss, process performance requirements , etc. , but also will need to meet the requirements of convenient disassembly . Therefore, do not watch a small a small pipe joints, because it exists only talent support from the presence of the entire hydraulic system .