How to Correctly Install Hydraulic Fittings

Hydraulic fittings are a simple pipe connection device widely used in low-pressure systems such as water and gas pipes. These fittings secure and seal pipes with a compression ferrule. The nuts of these fittings are all silver-plated and coated with a patented nano-seal enamel layer, reducing the installation torque of single ferrule pipe fittings by about 2/3. This makes hydraulic fitting installation easier, especially in narrow spaces or aerial operations.

Although the installation of hydraulic fittings is relatively simple, correct installation and regular maintenance are key to ensuring the safe operation of the pipeline system.

Characteristics

Hydraulic fittings shrink the ferrule into the 24° cone surface of the joint by tightening the nut, forming an effective hard seal while the ferrule bites into the pipe. The installation of hydraulic fittings is very convenient, requiring only a wrench for installation. Hydraulic fittings will not contaminate the pipeline due to oxidation during the installation process. Hydraulic fitting require the use of precision seamless tubing.

Installation Instructions

For proper assembly following assembly instruction shall be followed. Improper assembly may lead to malfunctions or impair safety.

1. Cut the tube:
   0.5° angle tolerance to the tube axis is permissible. Tube cutter is not recommendable.
   
2. Lightly remove chips and particles from the inside and outside cut edges of tube. Bevel up to 0.2 mm × 45° is permissible.
3. For tube bend, the minimum height from the straight pipe end to the bending radius must be at least twice the height of the nut.
4. Lubricate thread and cone of the fitting body, ring and thread of nut.
   

1. Slip nut and then ring onto the tube end. Ensure that the ring is placed correctly.
2. Screw nut manually onto fitting body until finger tight. Hold the tube against the shoulder in the cone of the fitting body.
3. Mark nut and tube for measuring the prescribed turns of the nut.
4. Tighten the nut 1-1/4 turns. Tube must not turn with tube. Stop edge of the ring limits over-tightening by increasing tightening torque.
   

1. Loosen nut and remove ring-mounted tube from fitting. And check if a visible collar has formed on the pipe in front of the first cutting edge. If not, tighten slightly more.
2. Insert the pre-assembled tube into the fitting.While holding fitting body with a wrench, tighten nut approx. 1/4 revolution beyond the point of a clearly perceptible resistance.