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Design and principle of operation
3 Design and principle of oper-
ation
The flow regulator basically consists of a
valve body (1) with restriction (8.5), bal-
anced plug (3) as well as a closing actuator
(6) with an operating diaphragm (6.1). The
differential pressure springs (5) installed in
the valve body determine the flow rate.
The regulator is designed to maintain the
flow rate at the adjusted set point in heating
and district heating systems. The valve closes
when the flow rate rises.
The medium flows through the regulator in
the direction indicated by the arrow. The ar-
eas released by the adjustable restriction
(8.5) and the valve plug (3) determine the
flow rate. The differential pressure springs
(5) determine the differential pressure across
the restriction of 0.2 bar.
The upstream pressure is transmitted to the
upstream pressure side of the operating dia-
phragm (6.1) in the actuator over the control
line (11). The pressure downstream of the re-
striction (8.5) is transmitted through a hole in
the plug to the downstream pressure side of
the operating diaphragm. The resulting dif-
ferential pressure creates a positioning force
at the operating diaphragm (6.1) which
moves the plug depending on the force of
the differential pressure spring (5). The maxi-
mum flow rate is adjusted at the restriction
(8.5) using the set point screw (8.3). The
cross-section of the valve is changed in such
a way that the differential pressure and the
differential pressure created at the restriction
are identical when the required maximum
flow rate exists.
12
PN 16 · DN 15 to 25
11.1
Legend for Fig. 3 and Fig. 4
1
Valve body
1.4 Coupling nut
2
Seat
3
Guide nipple with plug
3.1 Plug balancing
3.5 Plug nipple
3.6 Seal
4
Plug stem
Differential pressure
5
springs
6
Actuator
6.1 Operating diaphragm
7
Diaphragm case
8
Connecting piece
8.1 Restriction stem
8.2 Lock nut
8.3 Set point screw
8.4 Lead-seal hole
8.5 Restriction
8.6 Cap
8.7 Seal
11 Control line
11.1 Screw fitting
15 Screws
Fig. 3: Functional diagram of Type 45-9
7
6.1
EB 3128 EN
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