4
Watts Water Technologies, Inc.
Pressure reducing valves are used:
•
In sanitary systems
- to keep the pressure of the water constant in the distribution network downstream of the valve
- to avoid excessive withdrawals of water by controlling the pressure at the tap
- to keep the water pressure constantly below the maximum value allowed
•
In compressed air systems
- to keep the pressure constant in the network, irrespective of the oscillations in the pressure supplied by the
compressors
•
Downstream of storage tanks or cylinders
- to reduce and stabilize the pressure in the network, which is normally lower
The pressure reducing valves are used not only for water but also for air and non-aggressive gases.
The
DRV, DRVM, DRVN, DRVMN
Series
pressure reducing valves are compensated seat type. This means that as the
inlet pressure acts on the two openings A and B
(see Fig.1)
having the same cross section, it is compensated and does not
therefore result in any force on the pin-plug system when the opening angle of the valve is varied. The outlet pressure acts
on the diaphragm and thus also on the pin–plug system, which is thus subjected to two contrasting forces: the force exerted
by the outlet pressure, which tends to close the plug and the force exerted by the spring, which tends to open it. As a result,
the compensated seat valve has an outlet pressure virtually insensitive to variations in pressure upstream.
DRV
DRVN
Features:
1 Body
2 Cap
3 Adjustment knob
4 Setting screw
5 Spring
6 Diaphragm
7 Inlet connection
8 Pin
9 Plug
10 Filters
11 Outlet connection
Features:
1 Body
2 Cap
3 Lock nut
4 Setting screw
5 Spring
6 Diaphragm
7 Inlet connection
8 Pin
9 Plug
10 Guide bushing
11 Filters
12 Outlet connection
1
10
11
2
3
4
5
6
8
9
7
Fig.1
Fig.2
3
2
1
12
11
10
9
8
6
5
4
7
A
B
Application
Operation
