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PARKER GRESEN

Parker Gresen is a line of hydraulic components that originated within the Gresen Manufacturing Company, a producer of hydraulic valves and controls. The brand is now part of Parker Hannifin's hydraulic valve portfolio. The product range includes directional control valves, check valves, flow dividers, pressure relief valves, and related accessories. These components are used in mobile and industrial hydraulic systems to manage flow, pressure, and direction. The valves are typically constructed with cast iron bodies and are available with NPT or SAE O-Ring Boss ports. Pressure ratings vary by model, with common maximums of 2,000 psi, 3,000 psi, and 5,000 psi. Flow capacities range from 20 gpm to 35 gpm for the selector valves and flow dividers listed. Parker Gresen valves are often specified for applications requiring reliable hydraulic control, such as agricultural equipment, construction machinery, and material handling systems. The double pilot-operated check valves, for example, are used to lock actuators in position and prevent drift. Manual selector valves provide four-way, two-position control for directing flow between circuits. Adjustable flow dividers split or regulate oil flow to multiple branches. Inline pressure relief valves protect circuits from overpressure by diverting flow when a set threshold is reached. Stack valve accessories, such as relief plug kits, integrate relief functionality into modular valve assemblies. 3G Electric supplies Parker Gresen hydraulic valves and accessories to maintenance and procurement teams worldwide. The catalog includes part numbers such as LO-50-D, LO-10-D, S-50, S-75, K-20-NR, RPL-12-A, CFQ-A-75, and RP51A-3000. Each listing provides specifications like body material, port type, pressure rating, and flow capacity to aid in selection. 3G Electric supports the line with logistics and order fulfillment for global customers. For technical assistance or to confirm compatibility, contact 3G Electric with your system requirements.

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About PARKER GRESEN

Parker Gresen is a line of hydraulic components that originated within the Gresen Manufacturing Company, a producer of hydraulic valves and controls. The brand is now part of Parker Hannifin's hydraulic valve portfolio. The product range includes directional control valves, check valves, flow dividers, pressure relief valves, and related accessories. These components are used in mobile and industrial hydraulic systems to manage flow, pressure, and direction. The valves are typically constructed with cast iron bodies and are available with NPT or SAE O-Ring Boss ports. Pressure ratings vary by model, with common maximums of 2,000 psi, 3,000 psi, and 5,000 psi. Flow capacities range from 20 gpm to 35 gpm for the selector valves and flow dividers listed. Parker Gresen valves are often specified for applications requiring reliable hydraulic control, such as agricultural equipment, construction machinery, and material handling systems. The double pilot-operated check valves, for example, are used to lock actuators in position and prevent drift. Manual selector valves provide four-way, two-position control for directing flow between circuits. Adjustable flow dividers split or regulate oil flow to multiple branches. Inline pressure relief valves protect circuits from overpressure by diverting flow when a set threshold is reached. Stack valve accessories, such as relief plug kits, integrate relief functionality into modular valve assemblies. 3G Electric supplies Parker Gresen hydraulic valves and accessories to maintenance and procurement teams worldwide. The catalog includes part numbers such as LO-50-D, LO-10-D, S-50, S-75, K-20-NR, RPL-12-A, CFQ-A-75, and RP51A-3000. Each listing provides specifications like body material, port type, pressure rating, and flow capacity to aid in selection. 3G Electric supports the line with logistics and order fulfillment for global customers. For technical assistance or to confirm compatibility, contact 3G Electric with your system requirements.

Common Applications

  • Agricultural machinery — Parker Gresen LO-50-D double pilot-operated check valve locks hydraulic cylinders in position.
  • Construction equipment — Parker Gresen S-75 manual selector valve directs flow between circuits for cylinder control.
  • Material handling systems — Parker Gresen CFQ-A-75 adjustable flow divider splits oil flow to multiple hydraulic branches.
  • Industrial machinery — Parker Gresen RPL-12-A inline pressure relief valve protects circuits from overpressure up to 5,000 psi.
  • Mobile hydraulic systems — Parker Gresen RP51A-3000 direct-acting relief valve provides overpressure protection from 500 to 3,500 psi.
  • Stack valve assemblies — Parker Gresen K-20-NR relief plug kit integrates relief functionality into modular hydraulic valve stacks.

Frequently asked questions

Common questions about PARKER GRESEN from 3G Electric.

What is the difference between the Parker Gresen LO-50-D and LO-10-D double pilot-operated check valves?

The LO-50-D has 1/2-inch NPT ports and is rated for 2,000 psi and 25 gpm. The LO-10-D has SAE O-Ring Boss ports (size #10) and is rated for 3,000 psi and 25 gpm. Both have cast iron bodies and are used to block flow in one direction while allowing free flow in the opposite direction when pilot pressure is applied. The choice depends on port type and pressure requirements.

What are the flow and pressure ratings for Parker Gresen manual hydraulic selector valves?

Parker Gresen manual selector valves are available in two models: the S-50 rated at 20 gpm and 2,000 psi, and the S-75 rated at 30 gpm and 2,000 psi. Both are four-way, two-position valves used to direct hydraulic flow between two circuits. The S-75 has an overall height of 4 inches. These valves are suitable for mobile and industrial equipment where manual directional control is needed.

What is the purpose of the Parker Gresen K-20-NR hydraulic relief plug kit?

The K-20-NR is a hydraulic relief plug kit designed for stack valve assemblies. It integrates relief functionality to protect hydraulic circuits from overpressure by diverting flow when pressure exceeds a set threshold. This kit is used with compatible Parker Gresen stack valve systems to add or replace relief capability. It is an accessory rather than a standalone valve.

What are the pressure ranges for Parker Gresen inline pressure relief valves?

Parker Gresen inline pressure relief valves have different pressure ranges depending on the model. The RPL-12-A has a cast iron body and is rated from 0 psi minimum to 5,000 psi maximum. The RP51A-3000 is a direct-acting valve with a minimum setting of 500 psi and a maximum of 3,500 psi. Both are used to limit pressure and protect components from overpressure in hydraulic systems.

How does the Parker Gresen CFQ-A-75 adjustable flow divider work?

The CFQ-A-75 is a cast-iron adjustable flow divider with 3/4-inch NPT ports and a maximum flow rate of 35 gpm. It features lever control for precise adjustment. It is used to split or regulate oil flow between circuits in hydraulic systems. The lever allows the operator to change the flow ratio or setting as needed for pressure applications.

What port types are available on Parker Gresen hydraulic valves?

Parker Gresen hydraulic valves are available with NPT or SAE O-Ring Boss ports, depending on the model. For example, the LO-50-D has 1/2-inch NPT ports, while the LO-10-D has SAE O-Ring Boss ports. The CFQ-A-75 flow divider has 3/4-inch NPT ports. When selecting a valve, confirm the port type matches your system connections to avoid adapters or modifications.