Distinguish between rotary joints and ferrule connectors;
The ferrule-type pipe joint consists of three parts: the joint body, the ferrule, and the nut. When the ferrule and nut are fitted onto the steel pipe and inserted into the joint body, upon tightening the nut, the outer side of the front end of the ferrule fits against the conical surface of the joint body, and the inner blade evenly bites into the seamless steel pipe, forming an effective seal. The W-shaped column end with a 24° cone conforms to the DIN 3861 standard. The ferrule used is a double-blade ferrule.
Typically, the surface of the joint body and nut undergoes galvanizing treatment. The joint can withstand a maximum working pressure of 63MPa, and the seamless steel pipe can have a maximum outer diameter of 42mm.
Assembly of rotary joint and ferrule joint: installation
1. Cut a seamless steel pipe of appropriate length and remove the burrs at the ends. The end face of the pipe should be perpendicular to the axis, with an angular tolerance not exceeding 0.5°. If the pipe needs to be bent, the length of the straight section from the end face of the pipe to the bending part should not be less than three times the length of the nut.
2. Screw the nut and clamp onto the seamless steel pipe. Pay attention to the orientation of the nut and clamp, and do not install them upside down.
3. Apply lubricating oil to the threads and ferrules of the pre-assembled connector body, insert the tube into the connector body (the tube must be inserted to the end), and manually tighten the nut.
4. Tighten the nut until the clamp grips the pipe. This turning point can be felt through an increase in tightening torque (pressure point).
After reaching the pressure point, tighten the compression nut by 1/2 turn.
6. Remove the pre-assembled connector body and inspect the embedding condition of the cutting edge of the ferrule. The visible protrusion must fill the space on the ferrule end face. The ferrule can be slightly rotated, but cannot be axially pushed.
7. For final installation, apply lubricating oil to the threads of the actual installation joint body, and tighten the nut to match until a noticeable increase in tightening force is felt. Then, tighten an additional 1/2 turn to complete the installation.
Repeated installation:
All card sleeve connectors can be reinstalled multiple times, but it is necessary to ensure that the parts are undamaged and clean.
1. Insert the tube into the connector body until the clamp sleeve fits tightly against the inner conical surface of the connector body, and tighten the nut by hand.
2. Tighten the nut with a wrench until the tightening torque increases sharply, and then tighten it for an additional 1/4 to 1/2 turn.
check
The tube can be removed to check whether the assembly meets the requirements: there should be a uniform slight bulge on the tube at the end of the ferrule. The ferrule cannot slide back and forth, but slight rotation is allowed.
Reason for leakage:
The tube hasn't been inserted all the way.
The nut is not tightened.
3. Scratches on the outer surface of the tube or the tube is not round.
The tube is too rigid.
The ferrule-type pipe joint consists of three parts: the joint body, the ferrule, and the nut. When the ferrule and nut are fitted onto the steel pipe and inserted into the joint body, upon tightening the nut, the outer side of the front end of the ferrule fits against the conical surface of the joint body, and the inner blade evenly bites into the seamless steel pipe, forming an effective seal. The W-shaped column end with a 24° cone follows the DIN 3861 standard. The ferrule used is a double-blade ferrule.
Typically, the surfaces of the joint body and nut undergo galvanizing treatment. The joint is suitable for working pressures up to 63 MPa, and the maximum outer diameter of the seamless steel pipe is 42 mm.
