Abstract: A valve device for insertion in the fuel line of an internal combustion engine between the engine and the fuel pump therefor and adapted to impede the flow of fuel to the engine in response to a reduction in pressure in the lubricating oil system for the engine. The device is insensitive to variations in fuel pressure and flow rate by virtue of having a fuel pressure balancing piston associated with the valve and having an oil pressure sensitive piston substantially isolated from the fuel pressure and flow.

Abstract: In a liquid cooled engine or engine-driven accessory having an engine protection device for reducing the engine RPM to a safe level in response to a fluid pressure below an acceptable level, a temperature sensor valve continuously senses the operating temperature of the engine or engine-driven accessory and reduces the fluid pressure below the acceptable level of the engine protection device in response to an over-temperature condition or in response to a partial or complete loss of the liquid coolant. The temperature sensor valve includes a temperature sensing tip which is coupled to the housing of the engine or engine-driven accessory. A heat receiving section of the temperature sensing tip receives heat from the housing and a heat dissipating section which protrudes into the coolant filled chamber transfers heat received from the heat receiving section into the coolant.

Abstract: In a liquid cooled engine or engine-driven accessory having an engine protection device for reducing the engine RPM to a safe level in response to a fluid pressure below an acceptable level, a temperature sensor valve continuously senses the operating temperature of the engine or engine-driven accessory and reduces the fluid pressure below the acceptable level of the engine protection device in response to an over-temperature condition or in response to a partial or complete loss of the liquid coolant.The temperature sensor valve includes a temperature sensing tip which is coupled to the housing of the engine or engine-driven accessory. A heat receiving section of the temperature sensing tip receives heat from the housing and a heat dissipating section which protrudes into the coolant filled chamber transfers heat received from the heat receiving section into the coolant.

Abstract: A pressure ratio valve is installed in an internal combustion engine having a pressurized air supply and an air actuatable throttle control means for limiting the engine RPM in response to a pneumatic control signal. The pressure ratio valve continuously senses both the engine oil pressure and the pressure of the engine compressed air system and generates the pneumatic control signal in response thereto. When the oil pressure-air pressure ratio decreases below a predetermined magnitude, an unsafe engine oil pressure condition is indicated and the pressure ratio valve generates a pneumatic control signal which causes the throttle control means to limit the engine RPM to a safe level.

Abstract: A pressure ratio valve is installed in an engine having an engine protection means for reducing the engine RPM to a safe level in response to an engine oil pressure below an acceptable level. The engine further includes a fuel pump for supplying fuel at a pressure linearly related to the engine RPM. The pressure ratio valve continuously senses both the oil pressure and the fuel pressure of the engine and reduces the engine oil pressure below the acceptable level of the engine protection means in response to a fuel pressure-oil pressure ratio in excess of a predetermined magnitude. This action by the pressure ratio valve causes the engine protection means to reduce the engine RPM to a safe level.

Abstract: A fuel shut-off valve is described having a body with a cylindrical bore divided into first and second sections by an annular tapered shoulder. A piston is slidably positioned in the bore and inlcudes an O-ring that seats against the tapered shoulder or seat to isolate the first and second sections of the bore. One end of the piston is provided with a second O-ring sealingly engaging the bore and isolating that portion of the bore on one side of the face of the piston from the remainder of the bore. A fuel inlet passage communicates with the first bore section and an oil inlet passage communicates with a second bore section. An outlet passage communicates with the first bore section at a position axially displaced from and disposed on the opposite of the tapered seat from the first inlet passage.

Abstract: A starting system for use with an internal combustion engine is shown utilizing a container of compressed volatile fluid to be injected into the engine upon starting. The fluid is delivered from the container through the actuation of a solenoid that subsequently provides a metered quantity of the fluid to the engine. The solenoid is connected in electrical series with the engine starting switch, a timing switch, and a thermostatic switch. Operation of the starting switch results in the opening and closing of the timer switch to alternately break and complete the series circuit; the thermostatic switch is normally closed and is opened to break the series circuit when the engine temperature reaches a predetermined value.