AMOT G Series - Troubleshooting; Checklist

77
Technical Data
OMMG00012 Rev 12 – NOV 2019
ENGINE OILS
GEAR OILS
Oil
CST
Oil
CST
SAE 5W
6.8
SAE 75W
22
SAE 10W
32
SAE 80W
46
SAE 20
46
SAE 85W
100
SAE 20W
68
SAE 90
150
SAE 30
100
SAE 140
460
SAE 40
150
SAE 50
220
9.1.5 Valve Sizing Calculations
Pressure Drop
The G valve is designed to produce minimal pressure drop. The normal
recommendation when determining the size of an AMOT G valve is a pressure
drop between 0.01 and 0.1 bar (0.145 and 1.45 psi).
Valve Flowrate
A Kv is the valve’s flow coefficient. It is defined as the number of cubic metres
of room temperature water that flows through the valve with a pressure drop
of 0.069 bar (Cv is the imperial coefficient). See the table below for examples
of Kv and Cv for the G valves:
2”
3”
4”
6”
8”
10”
12”
14”
16”
Kv
82
207
323
729
1296
2025
2918
3972
5187
Cv
96
242
378
851
1513
2364
3405
4635
6053
Note
Cvs are applicable to 90° rotor versions only. For 180°
versions:
The basic formula to determine the
Kv of a valve is:
The basic formula to determine the
Cv of a valve is:
Dp
SG
Q
Kv =
Q
Dp
SG
Kv
= Flow (m
3
/h)
= Pressure drop (bar)
= Specific gravity of
fluid
= Valve flow
coefficient
Dp
SG
Q
Cv =
Q
Dp
SG
Cv
= Flow (US
gallons/min)
= Pressure drop
(psi)
= Specific gravity
of fluid
= Valve flow
coefficient
The formulae for finding flow (m
3
/h) or
pressure drop (bar) are shown below:
The formulae for finding flow (US
gallons/min) or pressure drop (psi)
are shown below:
Dp
SG
KvQ =
SG
Kv
Q
Dp
2






=
Dp
SG
CvQ
=
SG
Cv
Q
Dp
2






=
2
90
180
Kv
Kv =