4261 - Intake Air Shutoff Valves

DIESEL RUNAWAY... A CRUCIAL SAFETY ISSUE

Diesel runaway is a constant problem, injuring personnel and causing severe damage to equip-ment every year. A diesel engine will runaway and self destruct on hydrocarbon vapors, even if the engine's primary source of fuel is taken away. An intake air shutoff valve is a must for diesel engines which have even a slight possibility of encountering hydrocarbon vapors. AMOT's SPEEDTRAP Intake Air Shutoff Valves use the best available technology to shut down a run-away diesel by choking off engine intake air.

Frequent causes of diesel runaway

● HYDROCARBON VAPORS

- Methane
- Natural Gas
- Propane
- Gasoline
- Aviation Fuel
- Condensates

● COMBUSTIBLE DUSTS

.....- Grain Dust
- Coal Dust
- Metal Dust
- Soot

● EQUIPMENT MALFUNCTION

- Governor Misadjustment
- Governor Linkage Failure
- PTO Failure/Slippage
- Overturned Vehicle/Engine

Ineffective responses to diesel runaway

● TURNING OFF THE IGNITION

- Diesel engines use compression ignition, not spark plugs.

● DE-ENERGIZING THE FUEL SOLENOID

- Hydrocarbon vapors in the intake air will sustain a runaway with the primary fuel source removed.

● DISENGAGING THE ENGINE'S LOAD

- Will accelerate the runaway.

The dire consequences of diesel overspeed

Ultimately, a runaway diesel will self-destruct providing an ignition source for the hydrocarbon vapors which fueled the runaway. A range of undesirable outcomes results from a runaway:

Features and Benefits

● Most compact design available.

● Easily installed, saves money.

● Corrosive resistant, anodized aluminum and stainless steel constuction.

● Best Available Technology - "Butterfly Valve" design.

● Use "stand Alone" or in complete Runaway Shut Down System.

● Remote reset capability.

● Manual, pneumatic, electric, or hydro mechanical actuation.

Used across all industries

A speedtrap solution exists for your application

Typical applications

Magnetic pick-up sends RPM signal to speed switch. When RPM indicates runaway condition, speed switch trips, activating 3-way solenoid valve and closing intake air shutoff valve. Intake air shutoff valve can also be tripped by normally open momentary pushbutton. Protected toggle switch activated test circuit allows system to be tested (at 67% of overspeed) with out overspeeding engine.

Accessories for single source responsability

Specifications

Safety Control Operator
Adjustable Tripping Pressure..................5-40 psi Falling
.......................................................................(34-275 kPa)
Maximum Pressure on Diaphragm.....170 psi (1170 kPa)

Pneumatic Cylinder
Minimum Actuating Pressure.................30 psi (207 kPa)
Maximum Working Pressure..............200 psi (1380 kPa)

Electric Solenoid Operators (intermittent duty)
12VDC Type.....................................................107 Watts
24VDC Type.....................................................107 Watts
Maximum Coil Temperature......................350°F (175°C)
Rated for intermittent duty; 1 minute on, 9 minutes off

Manual Operator
Mechanical Pull to Release.......................15 lbs (67N)

Standard Materials
Valve Body & Disk...................Hard Anodized Aluminum
Valve Shafts.............................................Stainless Steel
Seals....................................................................Buna N
Safety Control Operator...................Anodized Aluminum
Pneumatic Cylinders............Aluminum & Stainless Steel
Brackets.......................................................Plated Steel

Maximum Intake Air Temperature
Buna N Seals (standard)...........................200°F (121°C)

Net Weight (including operator)
2.8" Size Valve.........................3.1 - 4.0 lbs. (1.4 - 1.8kg)
3.5" Size Valve.........................3.1 - 4.0 lbs. (1.4 - 1.8kg)
4.0" Size Valve..............See 4262 Literature, Form 1344
5.5" Size Valve...........................4.0 - 4.9lbs. (1.8 - 2.2kg)
7.0" Size Valve...........................5.0 - 5.9 lbs. (2.3 - 2.7kg)
8.0" Size Valve...........................5.2 - 6.1 lbs. (2.4 - 2.8kg)