Pressure limiting valves - assembly kits
D 7000 E/1
Pressure limiting valves
- assembly kits
February 2009-04
HAWE HYDRAULIK SE
STREITFELDSTR. 25 • 81673 MÜNCHEN
2.3
© 1977 by HAWE Hydraulik
Pressure limiting valves - assembly kits
These pressure limiting valves are ideally suited to be integrated in customer furnished valve housings or manifolds. The table below lists
the available assembly kits, consisting of valve seat + valve ball, spring etc. The basic valve design is similar to the pressure limiting valves
(with/without damping) illustrated in pamphlet D 7000/1.
The pressure relief valves are not suited for safeguarding pressure devices acc. to Pressure Equipment Directive 97/23/EC. There are also
versions available featuring unit approvals, see D 7000 TÜV, D 7710 TÜV, D 6905 TÜV.
1. Available versions, main data
Order examples:
MVA 6 A
MVD 5 B R X
Basic type coding, design
X = Undamped version
(see D 7000/1 sect. 1)
Version and coding
Spring dome
made of zinc
die-casting
Perm. pressure
at P = 700 bar
at R = 20 bar
Perm. pressure
at P = 700 bar
at R = 200 bar
MV..4 = 300 bar
Perm. pressure
at P = 700 bar
at R = 350 bar
Spring dome made of steel
MVF
1
)
MVB MVH
MVJ
3
)
MVZ
1
)
MVD
1
)
MVA
1
)
MVK
1
) MVU
1
)
A travel stop prevents too high lift of the valve ball with the
damping piston then jamming the valve passage. This could
occur otherwise when the spring is completely decompressed
or at excessive flow rates.
Ball seated valve with an dynamically acting lifting aid,
making the pressure setting rather unaffected from the
respective flow.
The spring loaded damping piston with ist long guide pre-
vents chatter over a wide viscosity range. For pressure limit-
ing valves without damping, see D 7000/1 sect. 1
Special benefits:
Valves with peened valve seat
Valves with screwed-in valve seat
Adjustability during operation
Pressure range
Size
1
) Only available with size 4, 5 and 6
2
) Settings below 10 ... 15% of p
max
are not recom-
mended. The lowest, achievable pressure with the
spring completely decommpressed, depends also
on the design related back pressure (dep. on flow),
see D 7000/1, sect. 3.2)
3
) Only size 6 available, perm. pressure at R = 50 bar
4
) Only types MVF, MVB, MVD, and MVA
5
) Only size 8
No coding Standard, tool adjustable
(Slotted screw and jam nut)
R Manually adjustable
(Wing screw and wing nut)
V
1
)
4
) Turn knob (self locking)
Turn knob, with lock
H
1
)
4
) Keys conforming the regulations of the
automotive industry; One key is scope
of delivery (usually anyway in the pos-
session of the authorized work staff)
Coding
(0)
2
) ... p
max
(bar)
Coding
4
5
6
8
Flow Q
max
(lpm) with
pressure range (coding)
A
700
B
500
400
5
)
C
315
E
160
F
80
A
12
20
40
---
B
20
40
75
160
C
20
40
75
160
E
20
40
75
160
F
20
40
75
---
Pressure p
max
= 700 bar; Flow Q
max
= 160 lpm
Flow pattern symbols
Standard,
tool ad-
justable
Manually adjustable:
Coding
R and V
Coding H