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Design and principle of operation
3 Design and principle of oper-
ation
The combined regulators basically consist of
a valve body (1) with a balanced plug as
well as a closing actuator with two operating
diaphragms. The regulators are used to limit
the differential pressure and flow rate to the
set points adjusted at the actuator. The regu-
lator closes when the differential pressure or
flow rate increases.
The medium flows through the regulator in
the direction indicated by the arrow. The ar-
eas released by the restriction (1.2) and the
plug (3) determine the flow rate and the dif-
ferential pressure ∆p or downstream pres-
sure p
(Type 47-1). The differential pressure
2
∆p is converted by the first operating dia-
phragm (6.1) and the differential pressure
Legend for Fig. 2 and Fig. 3
1
Valve body
1.1 Connection nut with seal and welding end
1.2 Restriction
2
Seat
3
Plug with guide nipple
4
Plug stem
5
Valve spring
6
Actuator
6.1 First operating diaphragm
6.2 First actuator stem
6.3 Second operating diaphragm
6.4 Second actuator stem
7
Distance ring
8
Set point spring (differential pressure)
9
Spring plate
10 Set point adjuster (differential pressure)
11 Control line (+)
14
˙
V
created at the restriction based on the flow
rate by the second operating diaphragm
(6.3) into a positioning force. The largest sig-
nal is always used to control the regulator.
Type 46-7 and Type 47-5
To control the flow rate, the low pressure
downstream of the restriction (1.2) is trans-
mitted through a hole in the plug (3) to the
top diaphragm chamber A. The high pres-
˙
sure of V is transmitted through the attached
control line (11) to the diaphragm chamber
B.
To control the differential pressure, the high
pressure of ∆p must be transmitted through
the external control line (13), which is at-
tached on the site of installation, to the bot-
tom diaphragm chamber D. The low pres-
sure of ∆p is equal to the high pressure of
12 Control line (+) Δp
13 External control line (+) Δp
14 External control line (–) Δp
15 Screws
16 Lock nut
17 Set point screw (flow rate, SW 4)
18 Cap
19 Manual adjuster (differential pressure)
20 Spindle
21 Support
22 Bottom section of the body
23 Spring plate
24 Nut
25 Stopper for plug
A to D = Diaphragm chambers
EB 3131 EN
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