STOPFLEX Hose Retention System
The energy contained within a pressure hose, inthe event of accidental disconnection from the fitting, can be very dangerous to anyone or anything in itsvicinity.The Stopflex retention system was designed to arrest the trajectory of the flexible hose, avoiding the situation where the energy contained inside may trigger a frightening “whip effect”.
Thanks to the Stopflex system, the hose is secured to the plant by means of a cable protecting both the operators and components.
See ISO 4413 below
Flexibility Of Use
Stopflex components can be applied to all kinds of flexible hoses.
A band, equipped with a rubber gasket, remains perfectly secured,simultaneously allowing the hose to swell according to the working pressure. The retaining components can be secured to nipples, to SAE flanges or other system components.
HOW DOES IT WORK?
STEP 1: DISENGAGEMENT
The Stopflex system does not operate during the moments of disengagiement of the flexible hose, but, if applied correctly, it ensures that the hose is fully disengaged from the ferrule that restrains it. During this step, the flexible hose gains velocity and power due to the pressure increase of the oil contained therein.
STEP 2: RELEASE / VENTING OF PRESSURE
During this step, the pressurised oil exits from the flexible hose.
The hose begins to release the energy contained therein, and gains considerable velocity, triggering a hazardous “whip effect” which is very dangerous to anyone or anything in its vicinity.
STEP 3: RESTRAINT
Once the hose has been disengaged and the pressure released, the flexible hose can be restrained. This is where the Stopflex system gets into operation: the stainless steel cable is tensioned and deformed while the plate cuts into the rubber of the hose, preventing the clamp, firmly attached to the hose, from disengaging. The hose clamp and plate start to deform in turn, elastically absorbing the force released from the travel of the flexible hose. This is a critical step which occurs within just a few seconds in which the materials and the components of the system, previously sized and tested, stop the dangerous travel
of the flexible hose.
ISO 4413 HYDRAULIC FLUID POWER, GENERAL RULES RELATING TO SYSTEM:
“Should the rupture of a hose assembly represent a whiplash hazard, the latter shall be restrained or shielded”.