In pumps with valve-plate fluid ends, where are the discharge valves typically positioned?

In pumps with valve-plate fluid ends, the discharge valves are typically positioned above the piston. This arrangement allows the discharge valves to effectively close off when the piston is in its backward stroke, preventing fluid from flowing back into the cylinder. When the piston moves forward, the pressure generated forces the fluid upward and through the discharge valves, allowing for efficient flow out of the pump.

This configuration is critical for maintaining proper operation and efficiency, as it ensures that the fluid is directed out of the pump without backflow. It also contributes to the overall compact design of the pump, as placing the discharge valves above the piston allows for more streamlined flow pathways.

In contrast, positioning the discharge valves at the base of the pump, below the piston, or within the pump casing would hinder the pump operation and could result in potential backflow issues or blockage, compromising the pump's efficiency. Thus, the correct positioning of the discharge valves is key to achieving the pump's intended performance.