Product Description
The VSX4 and VSX8 Series controller are designed to
shut off the flow of gas to the downstream system in the
event of outlet pressure rising above or falling below the
predefined levels.
•
The VSX4 and VSX8 Series can be integrated in
a slam-shut Type VS100 installed upstream of the
associated regulator.
•
The VSX4 and VSX8 Series controller are
equipped with an integral and automatic bypass.
Specifications
The Specifications section lists the specifications for the VSX4 and VSX8 Series controller. The following information
is stamped on the nameplate of VSX4 and VSX8 Series: Type and Class, Maximum Outlet Pressure and Spring
Range. Additional operating information is located on the Regulator nameplate.
1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
Available Configurations
Types VSX4L and VSX8L:
Low-pressure
controller which can be integrated into a regulator;
with 10 to 1100 mbar / 0.15 to 16 psig downstream
pressure and with either internal or external
pressure registration for the regulator.
Type VSX4H and VSX8H:
High-pressure
controller which can be integrated into a
regulator; with 1100 to 4000 mbar / 16 to 58 psig
downstream pressure and with either internal or
external pressure registration for the regulator.
Controller Type
DS:
Differential Strength
IS:
Integral Strength
Functional Class
A:
Min, Min and Max Installation
B:
Max Installation Only
Connections
Controller Vent:
1/4 NPT
External Sensing Line:
1/4 NPT
Maximum Allowable Pressure (PS)
(1)
Differential Strength:
20.0 bar / 290 psig
Integral Strength:
6.0 bar / 87 psig
Specific Maximum Allowable Pressure (PS
d
)
(1)
6.0 bar / 87 psig
Maximum Inlet Pressure (P
umax
)
(1)
Differential Strength (DS):
16.0 bar / 232 psig
Integral Strength (IS):
6.0 bar / 87 psig
Valve Plug Size
Medium Capacity Body (MC) Ø:
24 mm / 0.94 in.
High Capacity Body (HC) Ø:
39 mm / 1.54 in.
Operating Temperature (TS)
(1)
According to PED Standards
-20 to 66°C / -4 to 150°F
Non-PED:
-30 to 66°C / -22 to 150°F
Casing Material
Aluminum
Response Time (t
a
)
< 1 second
Resetting Trip Mechanism
Manually after Fault Rectification
Position Indicator
Extended stem visible in center of reset button
Pressure Registration
Internal or External
European EN Reference Standard
EN 14382
Approximate Shipping Weights
Type VSX4L/VSX8L:
1.4 kg / 3.1 lbs
Type VSX4H:
1.5 kg / 3.2 lbs
Options
•
Wire Seal
-
The VSX4 and VSX8 Series can
be ordered with an optional tamper-proof lock
wire to preclude unauthorized access to the
adjustment springs.
•
Limit switch
(inductive contact available only
on Type VSX8) - An optional remote notification
switch can be installed offering the capability to
remotely notify the operator should Type VSX8
shuttoff occur.
Pressure Drop
•
The VSX4 and VSX8 Series controller can be
mounted on various types of Emerson™ regulator.
It can also be mounted as a stand alone slam-shut
valve mounted in a Type VS100 body.
•
The VSX4 and VSX8 Series offer either internal or
external pressure sensing line, depending on the
regulator type and/or the specified conditions.
P
u
– P
u
2
– 4
2
ΔP =
2
Q
1.05 x C
g
VSX4 and VSX8 Series
2
