GE Oil & Gas
Mooney* Flowgrid*
Slam Shut Regulator
Delivering accuracy, performance and protection
Industries
Gas transmission
Gas distribution
Midstream gas
Gas processing
Applications
Gas pipelines
High occupancy buildings
City gate stations
Point of receipt
Customer Benefits
Easy maintenance with top entry design
High accuracy and performance
Over- or under-pressure protection
Resistant to sticking caused by
freezing or debris
Durable, with only one wear component
Integration with Flowgrid
regulators or can stand alone
Quick response time; fewer than 0.25 seconds
Globally recognized; obtained
EN 14382 certification from DVGW
Latch mechanism eliminates false trips
2
Meeting your needs for downstream
pressure protection
GE Oil & Gas has drawn upon our leading product technology and application expertise to develop
the Mooney Flowgrid Slam Shut regulator. The Slam Shut regulator provides accurate, reliable
secondary downstream pressure protection by shutting off the flow of gas when the sense or
outlet pressure in the system either exceeds or drops below the set pressure point. The device
can stand alone or be integrated with a Mooney Flowgrid regulator.
With the Mooney Flowgrid Slam Shut regulator, you get even more than a quality engineered
product. The Slam Shut regulator is backed by dependable technical support from GE and a free
training video that covers principle of operation, installation, maintenance and troubleshooting,
as well as a 3-D model library. Please contact your local representative for more information.
Because GE has an unflagging commitment to quality and safety, we have secured global PED EN
14382 certification for the Slam Shut regulator for sizes 2-4 inch. The certification was
awarded by DVGW (the German Technical and Scientific Association for Gas and Water), one of
the world’s most recognized industry certification bodies and the largest gas and water industry
certification agency in Europe. For more information about other certifications contact your
local representative.
The Flowgrid Slam Shut regulator has earned the trust of our customers around the world.
This advanced technology provides the reliability and security that is necessary for success in
this industry. Because the product’s top entry design allows for easy maintenance, users can be
more productive, which lowers overall costs and yields sustainable energy savings.
3
1-inch Flowgrid Slam Shut regulator
The 1-inch Slam Shut is a safety shutoff regulator that closes with a linearly acting plug.
The device has bubble-tight shutoff under all rated conditions and requires no minimum
differential for full shutoff. Set points are adjustable and repeatable regardless of flow rate,
inlet pressure, and temperature variations.
Features
Easy to maintain; only two bolts required to remove the entire Slam Shut assembly
Resistant to sticking caused by freezing water or debris in pipeline
Well-contained moving mechanical parts, which are resistant to vibration effects
Excellent performance and accuracy across a large pressure range by changing only the spring
External visual indicator to show when the unit is tripped
Easy to reset; only three caps need to be removed for complete reset
High cycle applications; only one wear component
No pressure differential requirements for full shutoff
Figure 1 - One inch Mooney Flowgrid Slam Shut
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Figure 2 - Two inch Mooney Flowgrid Slam Shut
regulator with over or under pressure protection.
2-inch to 4-inch Flowgrid Slam Shut regulator
The controller assembly for the Slam Shut can be supplied with either over- or under-pressure
shutoff protection in three basic interchangeable configurations:
1. Series 50 single function controller (Figure 2), which provides either over- or under-pressure
shutoff protection.
2. Series 50D dual function controller (Figure 3), where each function provides either over- or
under-pressure shutoff protection and both functions are controlled by a common sense port
3. Series 50DS dual function controller (Figure 3 and 4), where each function is controlled by an
independent sense port. This allows two independent locations to be monitored for an over- or
under-pressure condition, each with its own set point.
A stand alone Slam Shut consists of a Flowgrid body with valve module and cover mounted on
top. The pressure controller is mounted on the side of the valve module.
Features
Virtually eliminates nuisance trips caused by vibration and sense pressure variation
Retrofitable to existing 2-inch to 4-inch Flowgrid regulators
Pneumatically actuated latch mechanism
Bubble-tight shutoff with floating flapper design
Over- or under-pressure protection, or both
Water tight for below-grade vault installations
Stand alone or integrated into a Flowgrid regulator
Simple reset from front or back without removing covers
Easy maintenance with a top entry design
High accuracy
Proximity Switch signals the open/closed position of the valve
for remote indication (optional feature)
Figure 3 - Two inch Mooney Flowgrid Slam Shut
regulator with over and/or under pressure protection.
A second sense port is optional.
Figure 4 - Four inch Mooney Flowgrid Slam Shut
regulator with over and/or under pressure protection.
A second sense port is optional.
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Table 1 - Specifications
Sizes
Types
Imperial Metric
1-inch NPT & SWE
1.25-inch NPT & SWE
DN 25, DN 32, DN 50, DN 80,
DN 100
2-inch, 3-inch, 4-inch
Stand alone or integrated into Flowgrid regulator
Pressure Protection
Standard: Over
Optional: Over and/or under
Temperature
1
Maximum Operating Inlet Pressure
Operating Sense Pressure
1-inch
2-4 inch
Response Time
1
EN14382 restricts the minimum temperature to -4° F (-20° C).
-20°F to 150°F -29°C to 65°C
740 psig 50 bar
5 to 450 psig
10 psig to 50 psig
<0 .25 seconds
Principle of Operation for 1-inch Slam Shut
This valve has four critical elements:
1. Closing Element
2. Force Reduction Element
3. Tripping Element
4. Sensing Element
The sensing diaphragm will move the trip shaft
when the line pressure goes too high or too low.
At that point, the trip shaft will disengage the force
reduction element, which allows the rotating shaft
to rotate and the spring to push the plug to the seat,
causing full shutoff.
0.35 bar to 31 bar
0.69 bar to 31 bar
1
2
3
Table 2 - Set Point Ranges for 1-inch Slam Shut Table 3 - Set Point Ranges for 2-4 inch Slam Shut
Spring
Color
Red 5 - 10 0.35 - 0.7 10 2.5
Plated 10 - 40 0.7 - 3 5 2.5
Blue 40 - 90 3 - 6 2.5 2.5
Purple 90 - 175 6 - 12 2.5 1.0
Black 175 - 250 12 - 17 2.5 1.0
White/Green 250 - 450 17 - 31 2.5 1.0
2 Preliminary AG Data, Testing per EN 14382
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Spring Range
psig Bar
Accuracy
(% of Set Point)
Over
Pressure
2
Under
Pressure
Spring
Color
Plated 10 – 40 0.7 – 3 5 5
Blue 40 - 90 3 – 6 2.5 2.5
Purple 90 - 175 6 – 12 2.5 2.5
Black 175 - 250 12 – 17 2.5 2.5
White/Green 250 -450 17 – 31 2.5 2.5
2 Preliminary AG Data, Testing per EN 14382
Spring Range
psig Bar
Accuracy
(% of Set Point)
Over
Pressure
4
2
Under
Pressure
Principle of Operation for
2-4 inch Slam Shut
During normal operation the latch mechanism holds the closure element (flapper)
open as shown in Figure 5. The sense or
downstream pressure is monitored by the
over-pressure and under-pressure controller
diaphragms, which convert the sense
pressure into a force proportional to the
pressure. The force is counter-balanced
by the set point adjustment spring located
in the spring case. The adjusting screw is
used to vary the spring force and control
the over-pressure set point or the optional
under-pressure set point.
When the downstream pressure either
exceeds or is less than the pressure set
point, the controller diaphragm and spring
move, opening a valve. The open valve
allows inlet pressure to flow to the
actuator diaphragm, (see Figure 6). The
pressure acts on the diaphragm, which
pushes on the pin. The pin moves the
“L”-shaped pawl lever and releases the
flapper lever. When the flapper lever is
released, a set of springs pushes the
flapper valve closed and provides the
initial force to seal the valve.
Once the flapper valve closes the inlet
pressure is cut off as shown in Figure 7.
To return the system to operation the
technician closes the upstream and
downstream block valves to isolate the
system and bleeds off the isolated section.
Repairs are then made as required to
correct the cause of the over- or underpressure condition. A ½-inch (13 mm) hex
on the back side of the valve and front of
the controller allows Slam Shut to be reset
without removing covers. The Slam Shut is
reset by rotating the flapper valve open and
holding it momentarily while the actuation
pressure bleeds off and the latch engages.
Under Pressure
Trip Control Valve
Under Pressure
Trip Control Valve
Under Pressure
Trip Control Valve
Slam Shut Sense
Restrictor
Over Pressure
Trip Control Valve
Actuator
Vent Valve
Latch Closed
Filter
Type 24
Type 30
Flapper Valve
(Open Position )
Center Port
Vent
Inlet Outlet
Pilot Series 20
Loading
Outlet
Flowgrid Regulator &
Integral Slam Shut Valve
Figure 5 – Valve, Actuator & Latch Mechanism Open
Slam Shut Sense
Restrictor
Over Pressure
Trip Control Valve
Actuator
Vent Valve
Unlatched
Filter
Type 24
Type 30
Flapper Valve
(Between Open & Closed)
Center Port
Vent
Inlet Outlet
Pilot Series 20
Loading
Outlet
Flowgrid Regulator &
Integral Slam Shut Valve
Figure 6 – Valve, Actuator & Latch Mechanism Midway
Slam Shut Sense
Restrictor
Over Pressure
Trip Control Valve
Actuator
Vent Valve
Unlatched
Vent
Filter
Type 24
Type 30
Flapper Valve
(Closed Position)
Center Port
Inlet Outlet
Pilot Series 20
Loading
Outlet
Flowgrid Regulator &
Integral Slam Shut Valve
Pilot Sense
Pilot Sense
Pilot Sense
Figure 7 – Valve, Actuator & Latch Mechanism Closed
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GE Oil & Gas
2822 S. 1030 West
Salt Lake City, UT 84119
T: +1 801.487.2225
F: +1 801.487.2587
Visit us online at: www.ge.com/energy
©2012, General Electric Company
All Rights Reserved
*Trademark of General Electric Company
GEA19398A Mooney Flowgrid Slam Shut
Rev 06.2014
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