The Series BCV True Union Ball Check Valves are economical, thermoplastic ball check valves ideal for chemical and wastewater applications. The true union design allows for easy removal from a piping system without breaking down any piping connections. The valve body can be lifted out of the line by unscrewing two assembly nuts. Series BCV check valves are applied where back flow could potentially cause damage to pumps, filters, or process equipment. Line pressure moves the solid plastic ball off the elastomer seat, opening the valve. When the inlet flow stops, back pressure (3.75 psi minimum) moves the ball back onto the seat, stopping the flow. All plastic construction gives this series of check valves superior corrosion resistance and they will not contaminate sensitive fluids that come into contact with them. BCV check valves can be easily installed horizontally or vertically.