A fire truck valve checker system comprising: a pump, and a fire truck pumper valve (10, 110) including: a valve housing (9, 109) having an inlet side (20, 120) connectable to a water source, an outlet side (22, 122), and a valve element positioned therebetween, the valve element being selectively and repeatably rotatable between (i) a first closed position, wherein a seal is formed between the valve element and the valve housing (9, 109), thereby substantially preventing fluid flow between the inlet side (20, 120) and the outlet side (22, 122), and (ii) an open position, wherein the seal is broken such that fluid flow is permissible between the inlet side (20, 120) and the outlet side (22, 122), the valve element also being selectively and repeatably rotatable within a discrete angle in a direction toward the open position, from the first closed position into a second closed position in which the seal is maintained between the valve element and the valve housing (9, 109); and a controller (13, 113) operatively coupled to the valve element and configured to periodically rotate the valve element between the first closed position and the second closed position when the pump is not engaged and is not pressurized, that is when the pump is not connected with said water source. a pump, and a fire truck pumper valve (10, 110) including: a valve housing (9, 109) having an inlet side (20, 120) connectable to a water source, an outlet side (22, 122), and a valve element positioned therebetween, the valve element being selectively and repeatably rotatable between (i) a first closed position, wherein a seal is formed between the valve element and the valve housing (9, 109), thereby substantially preventing fluid flow between the inlet side (20, 120) and the outlet side (22, 122), and (ii) an open position, wherein the seal is broken such that fluid flow is permissible between the inlet side (20, 120) and the outlet side (22, 122), the valve element also being selectively and repeatably rotatable within a discrete angle in a direction toward the open position, from the first closed position into a second closed position in which the seal is maintained between the valve element and the valve housing (9, 109); and a valve housing (9, 109) having an inlet side (20, 120) connectable to a water source, an outlet side (22, 122), and a valve element positioned therebetween, the valve element being selectively and repeatably rotatable between (i) a first closed position, wherein a seal is formed between the valve element and the valve housing (9, 109), thereby substantially preventing fluid flow between the inlet side (20, 120) and the outlet side (22, 122), and (ii) an open position, wherein the seal is broken such that fluid flow is permissible between the inlet side (20, 120) and the outlet side (22, 122), the valve element also being selectively and repeatably rotatable within a discrete angle in a direction toward the open position, from the first closed position into a second closed position in which the seal is maintained between the valve element and the valve housing (9, 109); and a controller (13, 113) operatively coupled to the valve element and configured to periodically rotate the valve element between the first closed position and the second closed position when the pump is not engaged and is not pressurized, that is when the pump is not connected with said water source.