Accessories - TLV DR20 Manuel D'utilisation

5.7 Piping Supports / Maintenance Space
5.8 Piping Size / Diffuser
If the secondary side flow velocity is expected to be more than 30 m/s (100 ft/s), install a
diffuser in order to keep the flow velocity below 30 m/s (100 ft/s). If the distance between the
reducing valve and the equipment is great, a possible drop in pressure should be taken
into consideration when selecting the piping size.
Straight piping: 10 d or longer upstream
5.9 Two-stage Pressure Reduction
Employ 2-stage pressure reduction if the required reduction is not possible due to operating
range limitations (when it is not possible to reduce the pressure to the desired pressure using a
single pressure-reducing valve).

5.10 Accessories

Always install a shut-off valve and pressure gauge at both the inlet and outlet, and a shut-off
valve in the bypass line. Ball valves, which will not retain condensate, are recommended for inlet
and outlet shut-off valves. The bypass pipe should be at least 1/2 the size of the inlet pipe.
Pressure
Gauge
Install the
DR20/A-DR20, paying
attention to avoid
excessive load,
bending and vibration.
Supporting the inlet
and outlet pipes
securely is
recommended.
Globe Valve
Ball Valve DR20/
A-DR20
̶ 11 ̶
150
mm
(6" )
Diffuser
15 d or longer downstream
Ball Valve
Leave sufficient
space for
maintenance,
inspection and
repair.
150
mm
(6" )
Safety Valve
(Relief Valve)
Pressure
Gauge