Hamilton Jet HJ241, Manual

Page: 21 / 202

1.5
1 INTRODUCTION & PRODUCT DESCRIPTION
1.2 T
HE
H
AMILTON
HSRX R
EVERSE
S
YSTEM
HJ-241 / HSRX
1.2 THE HAMILTON HSRX
REVERSE SYSTEM
The Hamilton HSRX Reverse System is a self
contained Hydraulic Reverse Actuation System.
The actuation is provided by a compact Hydraulic
Reverse Cylinder that uses a rotary valve inside the
cylinder to give proportional positioning control.
This allows fast control response where accurate
posistioning is not required (from the fully up
position to just prior to the Reverse Duct entering
the waterjet) and fine control of the Reverse
Cylinder position where it is needed (around the
Zero Speed / Reverse position).
With the Piston restriction (A) fully open, equal
pressure acts on both the rod end and cap end of the
HSRX Cylinder. As the cap end area is larger than
the rod end area, the cylinder extends.
With the Piston restriction (A) closed, the Cylinder
retracts. At full retraction, the Bypass Valve (B)
opens, reducing the system pressure and power
consumption of the pump.
The Back Pressure Valve (3) Is factory preset at 3.45
MPa (500psi).
The Pump Assembly (1) is belt driven directly from
the Jet Unit.
The Pump Assembly comprises, Pump, an Integral
Tank, Flow Control and Pressure Relief Valves.
1.3 GENERAL ASSEMBLY DRAWINGS
Figure 2: Basic Hydraulic Circuit Diagram