Hz, Ha, Hb, He Controls; Operation; Functional Description; Hz Control - Danfoss 51 Series Service Manual
Hydraulic proportional controls
Hide thumbs
Also See for 51 Series:
- Service manual (64 pages) ,
- Repair instructions (36 pages) ,
- Service kit instructions (2 pages)
Table of Contents
Advertisement
Service Manual
HZ, HA, HB, HE Controls
Operation
18
Series 51 Hydraulic Proportional Controls Service Manual
Functional Description
The HZ, HA, HB, and HE controls consist of a ported housing mounted directly to the end cap. Variable
signal pressure fed to port X1 is routed to the end of the 4-way valve. A threshold spring and ramp
spring(s) act on the opposite end of the 4-way valve.
HZ Control
The HZ control has a check valve to resolve which port (system A or B) is higher pressure. It routes this
high pressure to the 4-way valve to power the servo piston.
HA and HB Controls
The HA and HB controls have internal porting to feed system A or B pressures, respectively, to the 4-way
valve to power the servo piston.
HE Control
The HE control has no internal porting for servo supply pressure. An external servo supply pressure fed to
port M5 is required.
HZ Schematic Diagram
A
B
M7
11009446 • Rev BA • July 2014
M4
M3
max.
disp.
T3
T2
T7
T8
T1
X1
P107 823
M1
L1
L2
M5
M2
Advertisement
Table of Contents
Need help?
Do you have a question about the 51 Series and is the answer not in the manual?