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how to use hydraulic rubber hose

Mar. 19. 2019

1. Do not twist the hose during installation. A slight twist of the hose may reduce the strength and loosen the joint. The fitting should be tightened onto the hose instead of tightening the hose to the fitting.


2. When the hose must be bent, the bending radius should not be too small, and should be greater than 9 times the outer diameter. The hose and joint shall have a straight section that is more than twice the outer diameter of the pipe.


3. Hose layout should avoid heat source and keep away from the performance of engine exhaust pipe. If necessary, a device such as a casing or a protective screen may be used to prevent the hose from being deteriorated by heat.


4. Where the hose must cross or work in friction with the mechanical surface, use a hose clamp or spring to protect the outer layer of the hose from damage.


5. When installing the hose, avoid the tension. Even if there is no relative movement at both ends of the hose, keep the hose slack. The tensioned hose will expand under pressure and the strength will decrease.


6. If the high-pressure rubber hose is placed on a key component, it is recommended to check it regularly or replace it.


Pipes can be divided into hard pipes and hoses. The hard pipe mainly refers to a metal pipe such as a steel pipe or an iron pipe; the hose mainly refers to a flexible pipe such as a rubber pipe, a PTFE (polytetrafluoroethylene) pipe, or a bellows.


For the first time in the series, let's talk about the rubber pipe in the hose. Let's start with the structure to understand the usefulness and weakness of high pressure tubing (protection key).


High-pressure tubing, also known as hydraulic hoses, rubber tubing, is a blood vessel in the hydraulic system that delivers pressure while delivering fluid. Broadly defined high pressure hoses also include hoses for transporting water, steam, chemical liquids, and the like.


As a passage for transmitting pressure, the high pressure hose must withstand the pressure of the internal liquid. Because it is the basic raw material of rubber, it is a short plate on the transmission system (although it is not as good as the steel pipe, but it can be twisted and bent), it is a consumable. Pressure is an important factor in the selection of tubes. The peak pressure of the equipment and the working pressure of the high-pressure tubing will not match the risk of bursting, which will lead to equipment downtime and even cause safety hazards! However, some brands have abnormal pressure or quality instability. Tube odds.


The fluids are used in many different types depending on the actual situation. There are general mineral oil, water glycol, mineral oil, water, chemical fluids, etc. for fire prevention and disaster prevention purposes. The inner rubber of the hose is formulated differently and is resistant to corrosion by the corresponding fluid. The oil pipe that is not resistant to the fluid meets the fluid, which simply causes the inner rubber to crack (as shown in the above figure), and the fluid (especially the water therein) enters the wire layer, accelerates the deterioration of the steel wire layer for wrapping, and severely explodes the weak portion. .


Most of the hoses move repeatedly following the operation of the equipment, which requires the hose to have good toughness. At the same time, the narrow space of the equipment installation also puts higher requirements on the tortuous radius of the hose. This is related to the rubber formula and the flexible steel wire. Be sure to acknowledge the parameters of the tubing manufacturer and the bending resistance data issued by the relevant manufacturers. Do not choose the tubing of the moving part by hand. Mismatched tubing selection and periodic inspection are not in place, and the tortuous stress concentration site is simple to attack the outer rubber crack and the steel wire is broken, and the tube is bursting.


Rubber products are generally afraid of ultraviolet rays, ozone, water, high temperatures, and conflicts, which all accelerate their aging and affect their service life. The equipment is inevitably in a high temperature and high humidity environment, and the open storage of construction machinery has higher requirements for the hose rubber formula. Therefore, it is a positive solution to prevent conflicts, excessive tortuosity, reduce the frequency of tortuosity, prevent high temperature and high humidity, and be trampled.