First, how to choose high-pressure pipe fittings
1, hose size
The inner diameter of the hose should be suitable. If the hose is fixed by a pipe clamp, or the hose passes through a spacer such as a steel plate, you should also pay attention to the outer diameter of the hose.
2. Work pressure
According to the safety factor of hydraulic hoses stipulated in relevant international standards, the generally recommended working pressure is usually one quarter of the minimum bursting pressure of hoses.
3. Impact pressure and fatigue life
The choice of hose is determined according to the maximum pressure value of hydraulic system design. Impact pressure will not seriously affect the fatigue life of rubber hose. For the hydraulic system with particularly frequent impact pressure, it is recommended to choose rubber hose products with special pulsation impact resistance.
4. Temperature range
Users should use the hose within the temperature range allowed by the hose quality specification. If it is operated continuously, it is recommended to cool it frequently.
5, chemical compatibility
If a special hydraulic medium is used, the user should ensure that the inner and outer layers, joints and O-rings of the selected hose assembly are compatible with the medium.
Second, how to compress the high-pressure pipe joint
First of all, the first type is the international metric plane joint with internal thread.
The second type is the international metric ferrule connector.
The third type is a 74-degree internal taper joint with international metric internal thread.
The fourth is the international metric ball joint with internal thread.
The fifth is the joint of mine hydraulic support.
There are some points for attention in the use of high-pressure tubing joints.
1, be sure not to cause surface friction of high-pressure tubing to avoid damage. Although the hose is used, we can't let the appearance of the high-pressure oil pipe leak.
2. The high-pressure tubing can't be bent, which will lead to the internal damage of the high-pressure tubing and add a lot of unnecessary trouble to the future use.
3. Don't use high-pressure tubing as soon as it comes up. It is recommended to filter with water. Some high-pressure oil pipes are acid and alkali resistant, so they can't be tested with a liquid that conflicts with the current liquid.
4. When installing the high-pressure oil pipe joint, it must be tightened to prevent liquid leakage.
Compared with ordinary pipe joints, the high-pressure pipe joints recommended above, that is, hydraulic pipe joints, have some special features in bearing capacity and impact resistance, so they can also be used in some demanding industrial places. In addition, we can further find that the standard of common hydraulic pipe joints should be divided with reference to appropriate specifications, and there are many places that need attention during installation, which can be fully understood from the above.
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