In the oil and gas and petrochemical industries, reciprocating pumps are critical equipment, and their reliable operation is of the utmost importance. To this end, the American Petroleum Institute (API) has established the API 674 standard to ensure the safe, stable, and efficient operation of reciprocating injection pumps in these industrial sectors.   1. What is the API 674 Standard? The full title of the API 674 standard is “Positive Displacement Pumps - Reciprocating” It is a comprehensive industry standard covering the design and manufacture of reciprocating injection pumps.   2. API 674 Technical Requirements Specify rated values and tolerance ranges for flow rate, pressure, power, and other parameters to ensure the pump delivers a stable flow rate and pressure of the medium; establish requirements for the structural design, dimensional calculations, and strength verification of core components such as the crankcase and crankshaft; Based on the characteristics of the pumped medium, the standard specifies materials for flow-passing, sealing, and pressure-bearing components, requiring them to possess good workability and durability; it strictly defines the structural design, sealing material, installation requirements, and leakage limits for dynamic and static seals in the sealing system to prevent medium leakage.   3. Why Choose Reciprocating Pumps? Reciprocating pumps offer exceptional pressure characteristics, delivering high pressure with stable output. Their flow rate is adjustable with high precision, meeting the lubrication requirements of various operating conditions. They are highly adaptable to different media, capable of reliably delivering high-viscosity fluids or those containing small amounts of impurities, and are minimally affected by changes in fluid viscosity. With a simple design and highly interchangeable components, reciprocating pumps are easy to maintain, robust, and durable, ensuring reliable operation while reducing failure rates and maintenance costs.   As a professional developer and manufacturer of reciprocating pumps, Elephant Machinery not only offers products that comply with the API 674 standard but also provides customized solutions. From triplex, quintuplex, to septuplex pumps, we meet the requirements of various operating conditions, and can also equip them with an intelligent pump station system.

The reciprocating injection pump is a positive displacement pump that relies on the reciprocating motion of a piston or plunger within the pump cylinder to achieve fluid delivery. Its fundamental structure primarily consists of three major components: the power transmission mechanism, the hydraulic end, and the auxiliary system.   1. Power End The reciprocating injection pump is the core component that transmits power and achieves motion conversion. It primarily consists of a prime mover, a reducer, a crank-connecting rod mechanism, and a crosshead assembly. The prime mover is typically an electric motor or diesel engine, providing the initial driving force for pump operation. The gear reducer, tailored to actual operating conditions, decelerates the high-speed rotational output from the prime mover before transmitting it to the crank-connecting rod mechanism. This mechanism is the power-end critical component, converting rotational motion into reciprocating oscillation of the connecting rod. The crosshead assembly then transforms this oscillation into linear reciprocating motion of the crosshead slider within its guide rails. By connecting to the hydraulic-end piston, it drives the piston's reciprocating motion to complete the fluid suction and discharge process.   2. Hydraulic End Reciprocating injection pumps directly contact the conveyed liquid and perform suction and discharge operations. They primarily consist of a pump cylinder, plunger/piston, suction valve, and discharge valve. The pump cylinder serves as the liquid conveyance channel, with its inner walls precision-machined to ensure smooth sealing during the reciprocating motion of the plunger/piston. The plunger/piston, constructed from high-strength, wear-resistant, and corrosion-resistant materials, performs periodic linear reciprocating motion within the pump cylinder driven by the crosshead assembly. Suction and discharge valves ensure unidirectional fluid flow, typically employing ball valve or disc valve configurations. The sealing performance between the valve seat and valve core directly impacts the pump's volumetric efficiency.         3. Auxiliary Systems These systems are essential for ensuring the safe and stable operation of reciprocating injection pumps. They include lubrication, cooling, sealing, safety valves and relief valves, instrumentation monitoring, and other systems.   4. Type • Plunger Pump • Piston Pump       Reciprocating injection pumps can be further categorized into electric reciprocating pumps and diesel engine reciprocating pumps. Whatever your requirements may be, Elephant Machinery can integrate them into the design to deliver a tailor-made reciprocating pump solution for you!