how to install hydraulic piping

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Hydraulic system, according to the connection in the form of hydraulic control elements can be divided into integrated (hydraulic stop) and distributed In either case, want to connect into the system, through the pipe connection. Pipe connections, pipe joints in general directly wit h Manifold or hydraulic elements connected to, the workload is mainly reflected in the piping connections. Choose whether or not reasonable in the pipeline, installed correctly and is clean, clean, have a great impact on the performance of the hydraulic system. Therefore, the installation of the hydraulic circuit is a major project for installation of hydraulic equipment. The quality of pipeline installation is one of the key factors related to the hydraulic system performance is normal.

The pipeline installation is generally divided into two, the first time that pre-installed, installed for the second time,. The pre-installed to prepare for the formal installation, the steps necessary to ensure that the quality of the installation.

(1) the selection and inspection of the pipelinemetric hydraulic hose fittings

In the choice of piping, pressure, flow, and the workin g medium of the system should be based on use of the environment and components, fittings requirements to select the appropriate diameter, wall thickness, material and piping. Pipe must be of sufficient strength, the wall is smooth, clean, no sand, no rust, oxide and other defects, and piping should be considered in the neat appearance of the pipeline and installation, use and maintenance to facilitate the work. Piping should be as short as possible, thus reducing the pressure loss, delay, vibration and other phenomena. Commonly used in oil absorption, oil pressure, oil return pipe diameter and pump flow


Check piping, piping inside and outside corrosion or obvious discoloration, the pipe was cut mouth, a small hole in the wall, more than 10% -20% of the pipe diameter of pipe surface concave (different syste ms require different :), will not be able to use pipe wound crack depth for the pipe wall thickness of more than 10% and other situations.


Long-term storage of pipe, severe internal corrosion, the application of acid thoroughly washed wall, cleaned, and then check their durability. Qualified in order to install it.

Check processed bending of the pipeline, should be noted that the bending radius of the pipe should not be too small. Curvature is too large, will lead to the increase in pipe stress concentration, and reduce the fatigue strength of the pipe, but also the most prone to zigzag wrinkles. Large cross-section of the ellipticity

Should not exceed 15%; the thinning of the outside of the bend wall thickness should not exceed 20% of the pipe wall thickness; the medial part of the bend is not allowed to have a sprain, crush, or uneven wrinkles. Bend within the lateral part are allowed to have a jagged or irregular shape of the phenome non. Flat curved part of the minimum diameter should be less than 70% of the original tube diameter.

(2) the installation of the suction line

Install the suction line should meet the following requirements.

â'  the suction line as short as possible, bend less, the diameter is not too small. Resistance to reduce the suction pipe, oil absorption to avoid difficulties, resulting in the suction air, cavitation, the pump suction lift, a variety of pump requirements vary, Zu is generally not exceeding

Over 500mm.

â'¡ suction pipe should be connected tightly and shall not leak, so as not to pump at work sucked into the air, causing the system to produce noise, making it impossible to suction (pump suction part of the thread, flange joints, often due to the small gap while leakage person air] Therefore, it is recommended that the sealant and the suction line in the pump suction connection.

â'¢ general way the hydrauli c pump suction pipe should be installed the oil filter, oil filter accuracy is usually 100-200 mesh, oil filter flow capacity at least equal to twice the pump rated flow, taking into account disassembly when cleaning generally in the design process of the fuel tank, hydraulic pump suction filter near the opened hand hole is based on such considerations.

â'£ In order not to cavitation in the suction pipe nozzle of the suction pipe should be inserted below the minimum oil level, the general distance from the underside of the tank 2 times the pipe diameter.

(3) The return pipe installation

Install the return line should meet the following requirements.

The â'  executive body, the main return oil pressure relief valve return pipe should be out into the tank below the liquid level to prevent oil splashing mixed peo ple

Bubbles, while the return pipe should be cut out toward the wall of the tank 45. Oblique.

â'¡ with external leakage of the pressure reducing valve, order of Fujian Province, solenoid valves, etc. drain and return line connectivity are not allowed back pressure, otherwise it should drain separately back to the tank, so as not to affect the normal work of the Fujian Province.

(3) mounted to the horizontal plane of the tubing, should be 3/1000 5/1000 of the slope. Pipe is too long, the tube should be fixed every 500mm clamping tubing folder.

[4> pressure pipeline installation

Pressure tubing should be installed as close as possible to the equipment and infrastructure, while at the same time to facilitate the connection and maintenance of the branch pipe, in order to prevent vibration of the pressure tubing should be piping installed in a solid place to add damping vibrations to eli minate vibration, or pieces of wood, hard rubber pad mounted on the hose clamp on the metal does not directly contact the pipeline.

(^) Fittings installation requirements

Oil spills, a higher proportion of poor installation fittings and fittings to install certain requirements.

(1) must be design drawings to the provisions of the connector installation.

â'¡ must check the quality of pipe joints, defects should be replaced.

The â'¢ connector cleaning with kerosene and gas blowing.

Before the the â'£ connector body twist, oil board or body, thread cleaning of the connector body is clean, coated with a sealant or PTFE plastic zone along the threaded wraps, in order to improve sealing to prevent leakage of joints . But we know that the sealing tape wrapped around to spin down the thread, generally 1 to 2 turns. The layers wrapped around too much, the course of their work, the connector is easy to loose, it will sp ill. Sealant flow pattern as a filler between the threaded buckle and buckle, the temperature should not exceed 60 degrees Celsius, otherwise it will melt, so that the liquid in the overflow from the buckle. Tighten the force should not be too large, in particular, is a tapered pipe thread connector body and tighten the power of the General Assembly of cracks, leading to leakage.

â'¤ connector body should be aligned with the tube end, are not allowed to deflection or bending phenomenon, the two planar bonding good to tighten, and there should be adequate tightening torque (or until the specified value), to ensure tight joints.

â'¥ To check the seal of quality, if the defects should be replaced, careful assembly, are not allowed to be installed right or wrong when installing the seal is damaged.

(6) flange installation requirements