Samson 44-6 B, Монтаж и эксплуатация, Страница: 15 / 66

EB 2626-2 EN 3-1
Design and principle of operation
3 Design and principle of oper -
ation
Î
See Fig. 3-1
The Type 44-6 B Pressure Regulator consists
of a single-seated globe valve with integrat-
ed actuator unit.
The regulator mainly consists of the valve (1)
with seat (3), plug (2) and balancing bellows
(6) as well as a spring housing with operat-
ing bellows (5), set point spring (7) and set
point adjuster (8)/set point screw (9).
The excess pressure valve is used to maintain
the pressure upstream of the valve to an ad-
justed set point.
The regulator is closed when relieved of
pressure. It opens when the upstream pres-
sure rises above the adjusted set point. The
process medium flows through the valve be -
tween seat and plug in the direction indicat-
ed by the arrow on the body. The position of
the valve plug determines the flow rate and,
as a result, the upstream pressure.
The upstream pressure p
1
to be controlled is
transmitted through a borehole (4) in the
valve body to the operating bellows (5)
where it is converted into a positioning force.
This force is used to move the valve plug ac-
cording to the force of the set point spring
(7). The spring force is adjustable at the set
point adjuster (8/9).
Legend for Fig. 3-1
1 Valve body
1.1 Body gasket
1.2 Seal
2 Plug
3 Seat
4
Borehole in body for upstream pressure p
1
5 Operating bellows
6
Balancing bellows
7 Set point spring
8 Set point adjuster
9
Set point screw with stainless steel/spheroi -
dal graphite iron version (DN 40/50) as
well as 8 to 20 bar set point range
10 Screws
12 Spring housing