Some installation and application methods of jacket type pipe joint

The jacket type pipe joint has the advantages of simple structure, convenient use and no welding. But in the medium and high pressure hydraulic system, if the operation is improper, it often causes leakage and affects its popularization and use.

Precautions for the sleeve type pipe joint:

No filler, such as sealant, is prohibited. Some people applied the sealant to the card sleeve in order to get better sealing effect, and the result was that the sealant was poured into the hydraulic system, causing the failure of hydraulic components such as Nei hole blockage.

When the pipe is connected, the pipe should have enough deformation allowance to avoid drawing the pipe.

When the pipe is connected, the side force should be avoided, and the side force will lead to the tightness of the seal.

When connecting the pipe, it should be good at once and avoid disassembly many times, otherwise the sealing performance will be worse.

The preloading of the jacket type pipe joint:

Preloading is the most important part of the jacket type pipe joint, which directly affects the reliability of the seal. The general need special pre heater, small diameter can be pre joint in a vise. The card sleeve type pipe joint mainly includes the socket type straight pipe joint, the card sleeve end, the straight through connection head, the card sleeve type three pipe joint and so on. Even if the same batch of goods is a batch of goods, the depth of the conical holes on these joints is often different, and the result will cause leakage, and the problem is often ignored. The correct way is to connect one end of the pipe with what joint body, and the corresponding connection ends are pre assembled with the same type of joints, so that the leakage problem can be avoided to the maximum.

The end face of the pipe should be flat. 管子锯断后应在砂轮等工具上打磨平齐，并且去除毛刺，清洗并用高压空气吹净后再使用。

When preloading, the coaxiality of the tube and the joint should be kept as much as possible. If the tube is too large, the seal will fail.

The inner edge of the preloading is not suitable to be embedded in the outer wall of the tube, and the jacket should not be deformed obviously. When the pipe is connected, it is assembled according to the required tightening force.

The installation of the jacket type pipe joint:

(1) the pipes that need to be washed should be treated with acid first as required;

(2) tube machine tools for cutting pipe sawing or special cutting length required, absolutely not allowed by fusing (such as flame cutting) or grinding wheel cutting; remove pipe end burr, cylindrical metal chips and dirt; remove the rust and dirt pipe joint; and also to ensure pipe roundness;

(3) the sleeve nut, successively sheathed in the pipe sleeve front edge (small end) from the pipe mouth at least 3mm, then the pipe is inserted into the connector body bore, until the top;

(4) slowly tighten the nut, while turning the tube until it does not move, then tighten the nut 2/3 to 4/3 circle.

(5) whether the check card has been cut into the tube and the position is correct. The sleeve is not allowed to move in axial direction, but it can be rotated slightly.

(6) re tightening the nut after inspection.