Additional Fittings - Samson 42-36 E Mounting And Operating Instructions

3.1 Additional fittings

Î See Fig. 3-4
Pressure gauges
Install a pressure gauge (3 and 5) at suitable
points to monitor the pressures prevailing in
the plant.
Type 42-36 E installed in the flow pipe:
1 2
1 Shut-off valve
2 Strainer
3 Pressure gauge (flow pipe)
4 Flow regulator
The minimum required plant differential pressure
∆p across the valve is calculated as follows:
min
∆p Minimum differential pressure across the valve in bar
min
∆p Differential pressure created at the restriction for measuring the flow rate in the regulator
restriction
·
V Adjusted flow rate in m³/h
K Valve flow coefficient in m³/h
VS
Fig. 3-4: Installation example: Type 42-36 E installed in the flow and return flow pipe
EB 3018 EN
8 4 9 3 7
+
6 5
Pressure gauge (return flow
5
pipe)
6 Shut-off valve
7 Motorized valve
Design and principle of operation
Bypass and shut-off valves
We recommend installing a shut-off valve (1
and 6) both upstream of the strainer and
downstream of the regulator and installing a
bypass line. The bypass ensures that the
plant does not need to be shut down for ser-
vice and repair work on the regulator.
Type 42-36 E installed in the return flow pipe:
1
6
8 Needle valve
9 Electric actuator
(
Δp = Δp +
min restriction
2 3 7
+
9 4 5
·
2
)
V
K
VS
3-5