Hydraulic hoses are meant to transport fluids from one component of the hydraulic system to the other, and these fluids travel at varying degrees of pressure. For this reason, the pressure rating is one of the most important factors to consider when choosing a hydraulic hose, we will dive into the hydraulic hose pressure rating chart to explore the rule of pressure.
The pressure rating determines how well or not the hose will convey a particular fluid. Your hydraulic system will fail to perform up to par if you buy a hose with an incompatible pressure rating.
What’s worse? You risk worksite injuries and damage to other critical equipment in the hydraulic system.
In this post, we take a closer look at the hydraulic hose pressure rating chart, the two main types of pressure ratings, and why pressure is important.
Hydraulic hose pressure rating is up to the hose structure
It is commonly known that a hydraulic hose consists of three parts from the inner side to the outer side,
The inner tube which contacts hydraulic fluid directly, the material must be compatible with hydraulic fluid.
The reinforcement layer surrounds the inner rubber and offers enough power to withstand the hydraulic fluid pressure.
Out cover which wraps the reinforcement layer and protects the inner layer from being destroyed.
So The reinforcement layer matters highly when it comes to pressure rating selection, textile braided, steel wire braided, or steel wire spiraled are the three fundamental types.
Generally speaking, the hydraulic hose pressure rating increases from lower to higher in order with textile braided < steel wire braided< steel wire spiraled.
We can take their typical instance to illustrate them:
SAE 100R3 — two braided textile reinforcements–are normally used in low-pressure scenarios.
SAE 100R2AT— two braided steel wire reinforcements– are most popular in middle-pressure applications with flexible requirements.
SAE 100R9– four spiraled steel wire reinforcement– used for heavy duty, high impulse engineering machine( I have to say the spiral reinforced hose with less than 4 layers doesn’t exist).
Hydraulic hose pressure decreases as the inner diameter grows when remaining the same structure(reinforcement)
when it comes to a specific hydraulic hose, the working pressure may decrease as the diameter grows, take SAE 100R1AT for example, from 3/16″ to 2″ in diameter, are all reinforced by one layer of steel braided reinforcement, and the working pressure decreased from 3265psi to 580psi.
Constant-pressure hydraulic hoses keep fixed working pressure via increasing reinforcement plies when the inner diameter grows.
Take SAE 100R15 as an example, the thinner is reinforced with 4 plies spiral steel wire, thus the thicker ones are reinforced with 6 plies spiral steel wire.
Note that hydraulic hose pressure ratings also depend on the hose design and industry standards. Hence, some hoses are specifically designed to handle relatively high-pressure fluid than other hoses with a similar inner diameter.
why is hydraulic hose ratings important to opt for a hydraulic hose?
Pressure is undoubtedly the most crucial feature when choosing a hydraulic hose. The ability to handle high-pressure liquids differentiates hydraulic hoses from others — like garden hoses, for example.
It’s essential to check the pressure rating of a hydraulic hose to know if it fits your hydraulic system. The liquid you want to transport is the primary deciding factor in knowing if it fits. Another critical factor is the maximum pressure of the hydraulic system.
The right hydraulic hose should have a higher maximum working pressure rating than the hydraulic system. This ensures it withstands pressure surges and spikes, which can happen anytime.
Furthermore, the pressure rating of a hydraulic hose goes hand-in-hand with that of the hydraulic fittings. The fittings connect the hose to the component. If the pressure rating of the hose is high and that of the fitting is low, the hydraulic system is still at risk of failure.
Therefore, an easy way to identify the right hydraulic hose pressure you need is by relating it to the hydraulic fitting.
SAE J517 100R series stipulate over 10 types of hydraulic hoses, in terms of hose construction, these cover textile braided, steel wire braided, and steel wire spiral hydraulic hose, in each product page, we list it individual hydraulic hose pressure rating chart, when you navigate more and give them more research, you will find the common rule I mentioned above.
With Sinopulse Group, the Chinese hydraulic hose manufacturer, you are guaranteed quality hydraulic hoses with correct pressure ratings. Reach out to us for all your hydraulic hose needs!