GRACO 571028 – Adjustable Return-to-Reservoir Pressure Relief Kit – 500-3500 PSI – 1/4″ NPT

GRACO 571028 – Adjustable Return-to-Reservoir Pressure Relief Kit – 500-3500 PSI – 1/4 NPT

Adjustable Return-to-Reservoir Pressure Relief Kit designed to protect pumps and systems by automatically relieving excess pressure back to the reservoir. Provides adjustable pressure control from 500-3500 PSI with convenient 1/4″ NPT inlet connection for easy installation and maintenance.

Specifications

Thread: 1/4″ NPT

Max Working Pressure: 35-241 bar (500-3500 psi)

Inlet Connection: 1/4″ NPT

Pressure Range: adjustable 500-3500 psi

Features

Adjustable pressure relief from 500-3500 PSI

Return-to-reservoir design for fluid conservation

1/4″ NPT inlet for standard connections

Kit includes all necessary components

Pressure relief functionality

Compatible with 24vdc motor systems

Applications

Pump protection systems

Hydraulic pressure control

Lubrication systems

Industrial fluid handling

Progressive oil systems

Progressive grease systems

Compatible Equipment

G3 pumps

Systems requiring 1/4″ NPT connections

G3GM Series pumps

96G005GM pump units

Various GM gear pumps

24vdc motor systems

Related Parts

571071 – Adjustable Return-to-Reservoir Pressure Relief Kit (1/4″ BSPP)

571058 – Pressure Relief-to-Atmosphere Kit (1/4″ NPT)

571070 – Pressure Relief-to-Atmosphere Kit (1/4″ BSPP), 56284BGM, 564138GM, 557819GM, Modu-FloGM, 563301GM, 96G005GM

563156 – VALVE, pressure relief, 750 psi (5.17 MPa, 51.71 bar)

Kit Contents

16C807 – VALVE, pressure relief, 500-3500 psi (3.44 MPa, 34.4 bar – 24.1 MPa, 241 bar), Set pressure 3000 psi ± 10% (20.69 MPa, 206.8 bar ± 10%)

Part of G3 Accessories line. BSPP version available as 571071. Atmosphere relief kits also available for applications not requiring return-to-reservoir function. Part 571028 is referenced multiple times as a pressure relief add-on component for various GM pump packages, but detailed specifications are not provided on this page. It appears to be an accessory item rather than a standalone product listing. Kit 571028 includes pressure relief valve 16C807. The valve can only be used on G3, G1, or G-Mini Pumps. Each pressure relief valve requires banjo kit p/n 571058 (except 16C807 because the banjo is already included in Kit 571028). The pressure adjustment screw may require periodic adjustments and turning it clockwise increases pressure.

Reference Manuals

340574 (Page 8) G3 Electric Lubrication Pump

340706 (Page 5) G3 Selection guide

352482 (Page 14) GM Powertrain Program Book

332291 (Page 35) G3 Standard Automatic Lubrication Pump

332298 (Page 47) G3 Pro Automatic Lubrication Pump;