Watts Industries PR500 Manual Del Usuario página 3

Available ranges
0,1 – 2,0 bar / 1,5 – 30
1,4 – 12,0 bar / 20 – 175 psi
7,0 – 21,0 bar / 100 – 300 psi
Installation
• Valves DN 50 up to DN 150 can be
mounted horizontal and vertical. Valves
from DN 200 up to DN 600 should be
installed horizontally.
• Before installation of the regulating
valve (and respective strainer), it is
recommended to flush the upstream line, in
order to clear it of sludge and other debris.
• It is better to install at the upstream and
downstream side of the valve a Watts
Butterfly valve to make maintenance easier.
Note: An efficient flushing should be
made with a fluid velocity of at least
1,5 m/s during several hours.
• Install the valve so that the FLOW ARROW
marked on the valve body matches flow
through the line.
5
2
3
1
psi
263 AP (brass)
X
X
Step 1.
On pressure reducing pilot, loose lock nut
and turn the setting screw counter-clockwise
(OUT), until the screw is practically
unloaded. This is the simulation of the
lowest setting value of the range, from which
the commissioner has to gradually increase
the pressure, up to the prescribed one.
Note: Do not set the pressure reducing
pilot (4) if the valve is pre-set by Watts
Industries.
Step 2.
Vent air of cover through the safety venting
cock mounted on cover (5).
6
4
pr500
263 AP (ss)
X
X
X
No. name
1 Body/Main valve
2. Fixed orifice
3. Flow strainer
4. Pilot valve
5. Air vent
6. Flexible tubing
3