Failsafe Air-intake Shut-off Valve 6″ ISOV N600-FS

Overview:

Although diesel engines are generally considered safer than gasoline engines in hydrocarbon-rich environments, they can pose ignition risks in specific scenarios. Diesel engine speed is regulated by an internal speed governor that controls the fuel supply. When flammable vapors are present in the atmosphere, they are drawn into the intake system alongside clean air, causing the engine to accelerate due to the additional fuel.
This acceleration leads to an increase in engine speed, resulting in the intake of more air and vapors, perpetuating the cycle until the engine starts running on unmetered vapors as its primary fuel source. If this cycle is not interrupted, it can result in engine overspeed or runaway, potentially becoming an ignition source for explosive vapors. This situation may lead to various hazards, including:
• Valve bounce
• Flames emanating from intake and exhaust pipes
• Elevated surface temperatures (auto ignition)
• Sparks
• Severe injury or fatality

The ISOV functions as an air shut-off valve integrated into diesel engine air intake systems, effectively halting airflow into the engine cylinders, thereby immobilizing the engine and ensuring the safety of both personnel and equipment. It offers manual or automatic control options, capable of responding to various fault or hazard conditions.
Having gained widespread adoption globally, the ISOV demonstrates exceptional performance in diverse environments, including challenging locations such as the Canadian Arctic, the Gulf of Mexico, the North Sea, African deserts, the Middle East, and the Pacific Rim, both onshore and offshore. Our product consistently meets or exceeds the stringent standards set by our diverse customer base, which includes leading engine OEMs.

Key Features & Benefits:

• Manual or automatic controls – Electric, Pneumatic
• Mechanical Failsafe control option available
• Used on-shore and off-shore
• Responds to a variety of fault or hazard conditions
• Available with 2” (51mm) to 8” (204mm) of unrestricted port
• Operates safely at ambient and induction air temperatures between 350°F – 400°F (176°C – 205°C)

Typical applications include power generation, rig saver, off-shore platforms, bulk fuel loading facilities, marine engine rooms, mining equipment, refineries, and petrochemical plants.

Dimensions(mm):

Note: There are a wide range of sizes and flange adapters available

Installation:

Generally, ISOV Air Intake shut-off valves can be installed pre-turbo or post-turbo on turbo-charged engines. For further support on installation, please contact our team here.

Operation:

ISOV Failsafe Valves are found on offshore cranes as well as on Oil and Gas installations whereby the valve must close whenever electric power is lost. This version requires Oil or Air pressure to guarantee its functionality. The Failsafe version is available in sizes from 2″ up to 8″ (50 – 203 mm).

The Failsafe (FS) Series work in the following way:

ISOV is opened by rotating the Hexagon as shown. While holding the Hexagon in the open position, the push button (2) has to be pressed.

At this stage the rotating Hexagon can be released provided the Push button (2) is pressed.

To hold the open position of the valve the locking switch has to be pressed and release the push button. After this procedure Oil or air pressure will take over the push button function which means that the valve will be latched in open position until pressure is lost through the 2/3-way solenoid valve.

The 2/3 Valve is a normally closed valve (see diagram) which means that whenever electric power is lost, the 2/3 Way will close the port and starve ISOV off the required pressure to remain in the open position.

Applications:

ISOV Air-intake shut-off valves are designed to work with a wide range of engines used in heavy-duty trucks, exploration, production, mobile, and rental equipment. Here are a few examples where ISOV valves could be installed.

ISOV Failsafe Series can be alternatively used on many installations. You can contact us for support in choosing the best ISOV air-intake valve for your needs.

Heavy Duty Trucks:

Exploration & Production Equipment

Mobile & Rental Equipment