Page 104 - The Tribology Handbook
P. 104
Hydrostatic bearings A18
RELIEF VALVE
IO'O
L 1
CONSTANT-FLOW VALVE
109
BEARING
IO*
L I
Fig. 18.4. Layout of typical control circuits
10'
I
0.05 0. 0.2 04
d
Fig. 18.5. Values of K, for capillaries of various
Design of control restrictors dimensions
Dimensions of capillary and orifice restrictors may be
calculated from the following equations
P/. -Po
Capillary flow Qo = --
Kc q
I28 1
where K =-- 0.8
e 7rd4
u'
Suitable values for length and diameter are presented in 0.7
Fig. 18.5. The I/d ratio should preferably be greater than
100 for accuracy and the Reynolds Number should be less 0.6
than
PUd 0.5
1000 where Re = --> p = density, v = average velocity,
v 0.4
d = bore diameter and q = dynamic viscosity.
a3
4 8
A = cross-sectional area of the orifice. REYNOLDS NUMBER Re
Values of the flow coefficient C,are presented in Fig. 18.6 Fig. 18.6. Values of the flow coefficient C, for
according to the values of Re. orifices
AI 8.2
