Patent ID: 7775501
Filing Date: 2010-08-17
Classification: F16K

Abstract:
1. A pinch valve comprising a hose-shaped valve member having a flexible peripheral wall and extending between two unions, said valve member defining a passage duct for a fluid and having arranged at its outer periphery two pinch elements which are opposite to each other diametrically as related to the longitudinal axis of the valve member and which are able to be shifted toward and away from each other for a greater or lesser pinching of the peripheral wall while performing an operating movement athwart the longitudinal axis of the valve member, and furthermore comprising an actuating member surrounding the valve member, said actuating member having actuating faces fitting radially outside over the pinch elements and being oblique in relation to the longitudinal axis of the valve member, said actuating member by performing an actuating movement being able to be shifted along the valve member in order to act on the pinch elements with its actuating faces for causing the operating movement of the pinch elements, wherein the pinch elements being capable of thrusting mutually opposite sections of the peripheral wall against each other in a fluid-tight manner in order to completely close the passage duct, wherein the actuating member is in the form of an actuating ring coaxially surrounding the valve member and located in an annular working space radially externally surrounded by a peripheral valve housing wall, and that drive means separate from the actuating ring are provided by which the actuating ring is able to be acted upon by a drive force in control of the actuating movement and wherein the pinch valve further comprises a spring means disposed in the annular working space, the spring means biasing the actuating ring against the pinch elements to move the pinch elements together thereby closing the passage duct in an absence of the drive force.