method of operation
The highly elastic sleeve anchored in the valve housing is surrounded by the socalled control space. If compressed air is applied to this space, the initially round sleeve distorts, becomes oval and then lies flat in a preset position. The pinch valve is now closed, as long as the control pressure is maintained. If the control space is vented, the sleeve opens by means of its own reset force and returns to the round, full cross-section with the help of the medium pressure. With a control pressure approx. 2.5 bar higher than the pressure of the fluid, the HOmatic pinch valve seals gaseous, liquid, pasty or powdery fluids. The highly elastic sleeve surrounds any solids. A gas-tight seal cannot be guaranteed if the flow medium consists mainly of coarse particles.