76
Technical Data
Rev 12 – NOV 2019
OMMG00012
9.1.3
Valve Weights
The approximate weights of the valve/actuator are as follows in kg (lb):
2
in
3
in
4
in
6
in
8
in
10
in
12
in
14
in
16
in
Cast Iron
32
(71)
48
(106)
60
(132)
86
(193)
146
(328)
187
(420)
295
(663)
435
(977)
575
(1292)
Bronze
34
(75)
51
(112)
67
(148)
100
(225)
164
(368)
209
(470)
319
(717)
485
(1089)
671
(1507)
9.1.4
Viscosity Correction
For the selection of valves for more viscous fluids than water, the following
must be calculated:
Viscosity:
Find the viscosity of the fluid in which the valve is to operate. The viscosity is
normally expressed in Centistrokes. Where ISO oil is used, the grade number
is also the viscosity eg: ISO VG46 is 46 Centistrokes at 40
°
C (110
°
F).
Viscosity Correction:
By using the correction graph below, the flow coefficient correction factor can
be established. The correction figure obtained from the graph should then be
multiplied by the original flow coefficient which can then be used in the
standard valve sizing formulae (Sect 9.1.5).
Example:
From the graph below, 100CST = correction factor of 0.68
0.68 x flow coefficient = corrected flow coefficient (Kv or
Cv).
Fig 26
Viscosity Correction Graph
Some approximate viscosities (CST) of SAE oils at 40
°
C (110
°
F) are shown
below, based on leading oil manufacturers published data:
Summary of Contents for 10GEF
Page 2: ......
Page 14: ...14 System Overview Rev 12 NOV 2019 OMMG00012...
Page 52: ...52 Electric Actuator Rev 12 NOV 2019 OMMG00012...
Page 54: ...54 PID Controller Rev 12 NOV 2019 OMMG00012...
Page 64: ...64 System Integration Rev 12 NOV 2019 OMMG00012 Fig 22 System Wiring Diagram 8072D Controller...
Page 67: ...67 System Integration OMMG00012 Rev 12 NOV 2019...
Page 68: ...68 System Integration Rev 12 NOV 2019 OMMG00012...
Page 74: ...74 Technical Data Rev 12 NOV 2019 OMMG00012 9 1 1 Valve Bore Fig 25 Valve Selection Curve...