Mooney Flowgrid Slam Shut 1” valve Instruction Manual | 5
Copyright 2021 Baker Hughes Company. All rights reserved.
Connection of any device such as a pilot to the
inlet port on the valve body can result in the flow
of gas downstream of the Slam Shut canceling the
secondary downstream pressure protection of the
slam shut. This may result in personal injury, death,
equipment damage, and/or bursting of pressure
containing parts and/or leakage of gas resulting in
explosion of accumulated gas.
9.
VENT VALVES AND GAUGE CONNECTIONS:
Vent
valves and gauge connections are recommended in the
inlet and outlet piping to the Slam Shut and downstream
regulator. These are a great convenience during start up,
maintenance, and operation.
10.
TOKEN RELIEF VALVES:
Installation of a token relief valve
in the line downstream of the Slam Shut is recommended.
The relief valve should be set to open before the Slam Shut
valve is set to close. Minor over pressure problems such as
gas thermal expansion or seat leakage due to dirt moving
through the system will be handled by the relief valve,
while maintaining a supply of gas to the customers. Major
malfunctions of the regulator beyond the flow capacity of the
token relief will activate the Slam Shut valve.
Set-up
Changing the Trip Set Point
1. Remove the Adjusting Screw Cap
2. Turn the Adjusting Screw with a 9/16” wrench to change
the set point. Turning clockwise will increase the setpoint
pressure, turning counter-clockwise will decrease the
setpoint pressure.
Resetting the Slam Shut (See Figure 4)
1. Close the Upstream and Downstream Block Valves.
2. Remove the bleed cap, reset cap, and clear bottom cap.
3. Inside of the cavity labeled ‘bleed’, push and hold the pin
with a screwdriver. This will cause the pressure upstream of
the valve to bypass the shutoff device into the downstream
piping, causing the pressure across the plug to equalize.
4. If an Underpressure feature is being used, the line pressure
must be 20% or more above the setpoint before resetting
the valve. If an Overpressure feature is being used, the line
pressure must be 20% or more below the setpoint before
resetting the valve.
5. Where the clear cap was previously located, find the shaft
with a hole through it. Insert a screwdriver into the hole and,
using the screwdriver as a handle, pull the shaft into the
reset position.
6. With the shaft held in the reset position, push the reset pin.
The trip mechanism will then ‘snap’ into place.
7. Replace the bleed cap, reset cap, and clear bottom cap.
(Make sure the reset pin remains in the ‘reset’ hole)
8. Open the Upstream and Downstream block valves.
Testing Slam Shut Shutoff
During all Slam Shut shutoff tests, if a Flowgrid pressure regulator
is combined with the Slam Shut, the Flowgrid must be in the
open position. There are two options to force the regulator open:
(1) install a ball valve in the inlet tubing to the restrictor and close
the valve to open the Flowgrid, or (2) disconnect and vent the
inlet and outlet tubing.
Shutoff Test – Overpressure Protection Only (See Figure 5)
1. Close upstream and downstream block valves and vent line
pressure on inlet and outlet sides.
2. Disconnect the Slam Shut sense line and plug the tubing
connection in the piping.
3. Connect a pressurized bottle into the Slam Shut sense line
and introduce pressure above the Overpressure Set Point.
The Slam Shut will trip closed.
4. Disconnect the bottle and re-install the sense line tubing.
5. Open the upstream block valve and monitor the downstream
piping for any leakage.
6. Go through the ‘Resetting the Slam Shut’ procedure for
Slam Shut reset.
Alternate Shutoff Test #1 – Overpressure Protection Only
(See Figure 6)
1. Must have a ball valve installed in the Slam Shut sense line
& a tee between the ball valve and the Slam Shut.
2. Close the Slam Shut sense line and vent the tubing.
3. Connect a pressurized bottle into the tee, and introduce
pressure above the Overpressure Set Point. The Slam Shut
will trip closed.
4. Disconnect the bottle and plug the tee.
5. Open the Slam Shut sense line ball valve.
6. Check the downstream piping for any leakage.
7. Go through the ‘Resetting the Slam Shut’ procedure for
Slam Shut reset.
Alternate Shutoff Test #2 – Overpressure Protection Only
1. Inlet and Outlet pipelines must have pressure.
2. Remove the adjustment screw cap on the Overpressure
Unit.3. Slightly loosen the nut on the adjusting screw. Do not
change the location of the nut on the screw.
4. Turn the adjustment screw counter-clockwise until the Slam
Shut trips closed.
5. Close the downstream block valve.
6. Vent the downstream piping and monitor the downstream
piping for any leakage.
7. Turn the adjusting screw clockwise until the nut contacts the
spring case. Tighten the nut.
8. Go through the ‘Resetting the Slam Shut’ procedure for
Slam Shut reset.
