The basic purpose of a check valve is to permit flow in one direction, prevent flow in the opposite direction and perform this function automatically and with a minimum of maintenance. In pumping applications, the head loss (pressure drop) across valves is also an important factor to be considered.
The HDL® Ball Check Valve meets all these requirements by providing positive back flow prevention, minimum maintenance and low friction losses. The HDL® Ball Check Valves offer great operational reliability because of their construction and working principle. It’s construction consists of just three components: body, cover and ball. The ball is the only moving part. The underlying principle of the HDL® Ball Check Valve is just as effective as simple. The valve housing has three openings: one for the inflow of fluids, one for the outflow of fluids and an other for positioning the ball inside the valve housing. Normally the rubber coated ball closes off the inflow opening. The ball is released from its seating when the slightest difference in pressure occurs. As soon as the fluid flows through the valve, the ball slides away from the flow of fluid along both guide rails. The inlet is then completely free. If the fluid pressure drops, the ball then slides back into the valve seat again and closes off the opening completely. |