Design And Principle Of Operation - Samson 2371-10 Mounting And Operating Instructions

Design and principle of operation

3 Design and principle of oper-
ation
The Type 2371-10 and Type 2371-11 Re-
ducing Pressure Valves consist mainly of a
single-seated angle valve with operating dia-
phragm and actuator housing.
The set point of the Type 2371-10 is adjust-
ed pneumatically by an external air supply,
e.g. compressed air.
The set point of Type 2371-11 is adjusted
manually by tensioning the set point spring.
The medium flows through the valve body (1)
in the direction indicated by the arrow. The
position of the plug (3) determines the flow
rate across the area released between plug
and valve seat (2). The valve closes when the
downstream pressure p
justed set point. The resulting output pressure
p depends on the flow rate.
2
Any medium escaping from the test connec-
tion (11) indicates that the operating dia-
phragm (4) may be leaking or the dia-
phragm has ruptured. The test connection of
Type 2371-10 is connected to a flexible pipe
elbow to discharge any medium escaping.
Type 2371-11 · Version with manual set
point adjustment (see also section 5.2 on
page 11)
In the idle state, the valve is kept open by the
set point springs (7). The valve closes when
the output pressure p
phragm (4) and the resulting force exceed
the force of the springs.
The set point is adjusted by an Allen key
(8 mm), which is inserted through the adjust-
6
rises above the ad-
2
acting on the dia-
2
ment opening (6.1) on top of the housing
onto the set point screw (6). The blanking
plug must first be removed. If necessary, the
set point screw can be secured by the lock-
ing screw (12) in the upper plug section to
prevent the set point screw from loosening
due to vibrations, causing the set point to
change.
The disk (15) serves as a bottom end stop to
protect the diaphragm from overload and to
prevent parts from falling apart inadvertently
while the regulator is being dismantled.
Turning the set point screw clockwise causes
the spring plate (7.1) to move upwards and
increases the spring force and the set point.
Turning the set point screw counterclockwise
relieves the spring tension and reduces the
set point.
Type 2371-10 ·Version with pneumatic set
point adjustment (see also section 5.2 on
page 11)
In the idle state, the valve is kept open by the
set point pressure p
plied as the control pressure.
When the force created by the output pres-
sure p acting on the diaphragm exceeds the
2
force resulting from the set point pressure p
the plug (3) moves towards the seat (2), clos-
ing the passage. In this case, the ratio be-
tween p and p is not necessarily 1:1.
1 c
As the output pressure p
force reduces again. The valve is opened
again when the pressure falls below the set
point pressure p .
c
(compressed air) ap-
c
drops, the resulting
2
EB 2640 EN
,
c