Data Sheet
Bulletin 71.1:S200
9
Figure 5. Type S202 Regulator with Internal Relief
A
B
C
1/4
3/8
1/2
6.4
9.5
13
D
E
F
3/4
1
1-3/16
19
25
30
Figure 6. Internal Relief Performance for Types S202, S202H, and S206 Regulators Venting Directly to Atmosphere
2.0
0
200
0
AK1632-B
A1759-2
T20747-A
A2773-1
The Type VSX-2 slam-shut device on the Types S208
and S209 regulators is a fast acting shutoff valve
which provides overpressure (OPSO) or over and
underpressure (UPSO) protection by completely
shutting off the ow of gas to the downstream system.
The shutoff module’s actions are independent of the
Types S208 and S209 regulators and of variations to
the inlet pressure. The Type VSX- 2 has internal or
external registration. External registration requires a
downstream sensing line.
The shutoff disk is held in the open position (reset
position) by a small ball holding the disk stem.
If the pressure below the diaphragm increases
(or decreases) reaching the Type VSX-2 setpoint,