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Tham khảo tài liệu 'industrial machinery repair part episode 2 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Pumps 409 During the suction stroke the piston moves to the left causing the check valve in the suction line between the reservoir and the pump cylinder to open and admit water from the reservoir. During the discharge stroke the piston moves to the right seating the check valve in the suction line and opening the check valve in the discharge line. The volume of liquid moved by the pump in one cycle one suction stroke and one discharge stroke is equal to the change in the liquid volume of the cylinder as the piston moves from its farthest left position to its farthest right position. Reciprocating Pumps Reciprocating positive displacement pumps are generally categorized in four ways direct-acting or indirect-acting simplex or duplex single-acting or double-acting and power pumps. Direct-Acting and Indirect-Acting Some reciprocating pumps are powered by prime movers that also have reciprocating motion such as a reciprocating pump powered by a reciprocating steam piston. The piston rod of the steam piston may be directly connected to the liquid piston of the pump or it may be indirectly connected with a beam or linkage. Direct-acting pumps have a plunger on the liquid pump end that is directly driven by the pump rod also the piston rod or extension thereof and that carries the piston of the power end. Indirect-acting pumps are driven by means of a beam or linkage connected to and actuated by the power piston rod of a separate reciprocating engine. Simplex and Duplex A simplex pump sometimes referred to as a single pump is a pump having a single liquid pump cylinder. A duplex pump is the equivalent of two simplex pumps placed side by side on the same foundation. The driving of the pistons of a duplex pump is arranged in such a manner that when one piston is on its upstroke the other piston is on its downstroke and vice versa. This arrangement doubles the capacity of the duplex pump compared to a simplex pump of comparable design. Single-Acting and Double-Acting A .
