SAFETY VALVE

摘要

The invention provides for a safety valve (10) for regulating the flow of fluid in a hose connected to a pneumatic or hydraulic tool. The valve (10) includes a housing (12) which defines a primary chamber (16) having an inlet (28) and an outlet (30), and a secondary chamber (18) in fluid communication with the primary chamber (16). The secondary chamber (18) has an inlet in the form of eight apertures (36) leading from the primary chamber (16) to the secondary chamber (18) and an outlet in the form of eight apertures (38) leading from the secondary chamber to the primary chamber. A valve closure (14) is movable within the primary chamber (16) between an open position in which it is located between the secondary chamber inlet (36) and the secondary chamber outlet (38) for allowing air to flow from the primary chamber (16) to the secondary chamber (18) through the secondary chamber inlet (36) and from the secondary chamber (18) to the primary chamber (16) through the secondary chamber outlet (38), and a closed position in which it covers the secondary chamber outlet. The safety valve (10) also includes a coil spring (50) which is attached to the valve closure (14) for biasing the closure away from the closed position.