Samson 41-23 - Design and Principle of Operation; Regulator Design and Functionality

EB 2512 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
Î RefertoFig.3-1
The Type 41-23 Pressure Reducing Valve
consistsofaType2412ClosingValveanda
Type2413Actuator.Thevalveandactuator
(exceptfortestedregulators)aredelivered
separately and must be assembled together
according to these instructions (see the 'In-
stallation' section).
The pressure reducing valve is used to main-
tain the pressure downstream of the valve to
an adjusted set point.
Theprocessmediumowsthroughthevalve
between seat (2) and plug (3) in the direc-
tion indicated by the arrow on the body. The
position of the valve plug determines the
owrateand,asaresult,thepressureratio
across the valve. The plug stem is sealed by
a frictionless bellows (5.1). The downstream
pressure p
2
is transmitted over the compen-
sation chamber (18) (for liquids above
150°Candforsteam)andthecontrolline
(17) to the operating diaphragm (12) (oper-
ating bellows (12.1) in the version with bel-
lows actuator) where it is converted into a
positioning force. This force is used to move
the valve plug depending on the force of the
set point springs (7). The spring force is ad-
justable at the set point adjuster (6). The
valves with K
VS
4andhigherhaveabalanc-
ing bellows (4). The upstream pressure acts
on the outside of the bellows and the down-
stream pressure on the inside of the bellows.
As a result, the forces produced by the up-
stream and downstream pressures acting on
the plug are balanced out.
Depending on the valve and actuator used,
the regulator can be upgraded to create a
pressurereducingvalveforlowowrates,a
steam pressure reducing valve or a pressure
reducing valve with increased safety (actua-
tor with two diaphragms).
The valve closes when the downstream pres-
sure rises.
LegendforFig.3-1
1
Valve body
2
Seat
3
Plug
4
Balancingbellows
5
Plug stem
5.1
Bellows
6
Set point adjuster
7
Set point springs
7.1
Spring plate
8
Crossbeam
8.1
Pillar(viewdrawnturnedby90°)
8.2
Nuts for pillars
8.3
Tapped holes
9
Fastening nuts
10
Diaphragmactuator/bellowsactuator
11
Actuator stem
12
Operating diaphragm
12.1
Operating bellows
13
Diaphragm plate
14
Diaphragm plate nut
15
Nuts and bolts
16
ControllineconnectionG¼
(with screw joint with restriction when used
with steam)
17
Control line (to be provided on site)
(available as control line kit for direct
pressure tapping at the body uT2595)
18
Compensation chamber
19
Filler plug
20
Travel stop cap with cotter pin