Double acting hydraulic cylind
發布時間：2009-09-20 來源：揚子工具集團 瀏覽次數:70716B 8354．1992
Informative Reference-Selection and usage of packings and working fluid
for hydraulic cylinders
This Informative Reference describes the items to be considered when select．
ing and using packings to be incorporated into the double acting hydraulic cylin—
ders specified in the text of this Standard．
It is desirable to apply this to cylinders other than those specified in this Standard．
1．．l．．．t．．．e．．．m．．．．．．s．．．．．．f．．0．．．．r．．．．．s．．．e．．．．l．．e．．．．c．．．t．．i．．．n．．．．9．．．．．．p．．．．a．．．．c．．．k．．．．i．．n．．．．9．．．。s．The cylinder packings shall not be selected
by considering one particular item independently，but be selected by taking into
account of mutual relationships between materials，working fluid，temperature，
pressure and speed to be used．
Items for selection are as follows：
1：：l．)—Compatibility of working fl—uid with packing material While it is difficult
to make working fluid correspond to packing material unconditionally，be—
cause the compatibility of working fluid with rubber varies depending on 、
additives and the like，a yardstick of selection is shown in Informative Ref-
erence Table l．
Informative Reference Table l．Working fluids compatible with packing materials
|
Kind of working
fluid
|
Nitrile
rubber
|
Urethan
rubber
|
Fluoric
rubber
|
Ethylene
tetrafluoride
resin
|
Metal
|
|
Symbol
|
|||||
|
1
|
2
|
3
|
4
|
5
|
|
|
Mineral working
fluid
|
O
|
O
|
O
|
O
|
O
|
|
Working fluid of
water-glycol series
|
O
|
×
|
△
|
O
|
O
|
|
W／O emulsion
working fluid
|
O
|
△
|
O
|
O
|
O
|
|
0／W emulsion
working fluid
|
O
|
△
|
O
|
o
|
O
|
|
Working fluid of
phosphoric ester
series
|
×
|
×
|
O
|
O
|
O
|
|
Working fluid of
aliphatic acid
ester series
|
|
△
|
△
|
O
|
O
|
Remarks l．Those marked麗th O are possible to be used，but those marked with×
impossible，and for those with A，users are requeste．d to consult seal
manufacturers．
2．With regard to nitrile rubber,when use such working nuid that the stan．
dard rubber(e．g．such standard rubber as spec洫ed in IS0 6072 and JOHS
107 established by the Japan Oil Hydraulics and Pneumatic Association)
to be used for evaluating the compatibility of the fluid with the packings
used becomes particularly swelled，the user is requested to consult the seal
manufacturer．
．／，
3．
4．
45
E 8354．1992
Materials of urethane rubber should be equivalent t0，or better t§an ure-
thane rubber of caprolactone in resistance to heat and hot water
For metal packings，the materials compatible with the working i[uid used
should be selected．
5．When working fluid or material of packing other than the above is used，it
shall be agreed between the purchaser and supplier．
Temperature range applicable to materials of packing A yardstic k of the
temperature ranges applicable to materials of packing is shown in：nforma-
tive Reference Table 2．
Informative Reference Table 2．
Temperature range applicable to
materials of packing
2．
3．
The temperatures on sliding surface is presupposed to be within!0。C
above the oil temperatures shown in Table above．
When materials of low or high temperatures are to be used，the S≥al manu-
facturer shah be informed to that effect．
To the temperature range applicable to cloth-inserted rubber，the range in
which the rubber can be used shall correspondingly applied．
The temperature range applicable to metal packings varies deper．ding on
the kind of metal used．
Recommended temperature range for working fluid The recomme aded
temperature range on application of working fluids is shown in Inf0：mative
Refe：rence Table 3．
46
B 8354．1992
Informative Reference Table 3．
Recommended temprature range
for working fluid
Remarks l．圖圓indicates the temperature ranges in which the working fluid can be
used steadily over a relatively long period of time without causing any
trouble in its stabilization．
2．
It is considered that the general mineral working oil above has a viscosity
grade ISO VG 32 specified in JIS K 2001．
3．When working fluid above is used at a temperature exceeding the specified
temperature range，its user is requested to consult seal manufacturers，
because there are some problems in respect of the compatibility of working
fluid with packing material．
Shape and material of packing and maximum permissible WOrking pressure
MaXlmUm permmmDle working PressUres at WnlCn eacn packing can be used
according to its shape and material are Shown in Informative Reference
Table 4． ‘
47
1；8354．1992
Informative Reference Table 4．Maximum permissible working press ire
for packing
Note(1)
When the V-packing is used by stacking single pieces of rubber Oil ty，it
should be preferable to consult wi也the seal manufacturers．
Remarks l．The packings shall be ofHs 90±5 in rubber hardness．Regarding the
hardnesses other than these，the maximum permissible working I ressure
varies according to the hardness of rubber．The combination seal lhall be
exempt from this application．
48．
B 8354．1992
2．The protruding clearance of packing has been assumed as about H 9／f 8．
3．The configuration diagrams ofpacking are given for example．
4．For the applicable ranges，the ranges of the ambient temprature given in
3．2 in the text and the piston speed(Table l in the text)of 3．4 in the te】(t
should be applied．
(5) Relationship between packings and their sliding speeds The maximum
permissible piston speed is greatly affected not by the shape of a packing
but by its material．
Maximum permissible piston speeds are roughly given in Reference Table 5
when packings are used within the maximum permissible working pressure
ranges given in Informative Reference Table 4 and within the temperature
ranges given in 3．of the text of this Standard．
Reference Table 5．Maximum permissible piston speed
|
Material of packing
(symb01)
|
Shape of packing
(symb01)
|
Maximum permissible
piston speed mm／s
|
|
Nitrile rubber(1)
Urethane rubber(2)
Fluoric rubber(3)
|
V-packing (V)
L[J】·packing (L)
U·packing (U)
X-packing (X)
0-packing (O)
|
500
|
|
Cloth．inserted rubber
[Fluoric rubber(3)]
|
V-packing (V)
L[J]-packing (L)
U-packing (U)
|
800
|
|
Cloth．inserted rubber
[Nitrile rubber(1)】
|
V-packing (Ⅵ
L【J】一packing (L)
U-packing (U)
|
1000
|
|
Ethylene tetrafluoride resin
and rubber(4)
|
Combination seal(S)
|
1000
|
B 8354．199：：
Edition l
Japanese Text
Established by Minister of International Trade and Industry
Date of Establishment： 1965．04．0l
Date of Revision： 1992．10．0l
Date of Public Notice in official Gazette： 1992．10．26
Investigated by： Japanese Industrial Standards Committee
Divisional Council on General Machinery
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