Abstract: Disclosed herein are systems and methods relating generally to computer system security and more specifically to scalable cyber-threat detection systems and methods that systematically and automatically execute and monitor code within a secure isolated environment to automatically identify and filter out malicious code so that it is not executed on a live system.

Abstract: A method of supplying a higher pressure air supply to a lower pressure air supply comprising a primary air supply tank, maintained at a first higher pressure by a compressor, continuously fluidly coupled to one or more secondary air supply tank(s) through a pressure reducing valve, maintained at a second, lower pressure to the pressure of the primary air supply tank. In this way the primary tank serves as a higher pressure reservoir and increases the efficacy of the secondary air supply tanks.

Abstract: Air is supplied to an air brake supply tank on a wheeled vehicle by supplying air from an air compressor to a primary tank at an elevated pressure, fluidly coupling the primary tank to a supply tank, and reducing the pressure of the air supplied to the supply tank to a level suitable for use by the vehicle's air brakes.

Abstract: A diaphragm-type pneumatic brake actuator is provided with a closing valve that seals the air pressure line upstream from the diaphragm in response to diaphragm rupture. This isolates the actuator from the pressure line so that the line does not lose pressure and, thus, prevents a diaphragm rupture in one brake actuator from adversely affecting another brake actuator coupled to the same air pressure line.

Abstract: A brake system (2) uses a multi chamber brake actuator (6), including a service brake actuator (8) and a spring brake actuator (80), coupled to an air brake by a slack adjustor (122). The spring brake actuator is configured to pull on, instead push on, the push rod (120). In some embodiments (6b, 6c) the spring brake actuator applies a lower level parking brake force or a higher level emergency brake force.

Abstract: An emergency and parking (E&P) brake system (6) is used with a brake system (2) of the type including an air brake coupled to a service brake actuator (8) by a slack adjustor (104) movable between brake released and brake applied positions. The E&P system includes an E&P actuator (80), located physically distant from the brake actuator, which has a variable volume spring brake chamber (82), a spring brake chamber diaphragm assembly (84) movable between first and second positions, a variable volume spring deflection compensation chamber (86), and a movable compensation chamber diaphragm assembly 88. A compression spring (90) is positioned between the two diaphragm assemblies. The spring brake chamber diaphragm assembly is connected to the slack adjustor by a flexible cable (110). The spring brake chamber is normally maintained in its first position by pressurizing the spring brake chamber. Depressurizing both chambers applies a lower, parking brake force through the cable and slack adjustor.

Abstract: A compressor (2) uses lower pressure compressed air from a compressed air supply (4, 6) to automatically create higher pressure compressed air. This compressor includes a pressure intensifier (8) having a piston assembly (16) sized for reciprocal movement between forward and retracted positions. The first cylinder (20) has an inlet (10) coupled to the air supply. The second cylinder (22) has an outlet (14) and a supplemental inlet (38). A first check valve (40) couples the supplemental inlet to the ambient atmosphere to permit fluid to flow through the first check valve and into the second cylinder through the supplemental inlet, but not the reverse. A second check valve (42) is coupled to the outlet and permits fluid to flow from the second cylinder, through the outlet and through the second check valve. The compressor also includes means for venting (48) the first cylinder to atmosphere when the piston assembly is in the forward position to permit the piston assembly to return to the retracted position.

Abstract: A dual pressure vehicle air brake system (60, 61, 100, 101) made according to the invention includes first and second sources (62, 64) of pressurized air at, for example, 175 psi and 100 psi, respectively. A combination brake actuator (6) includes a conventional service brake chamber (8) adapted to accommodate the lower, second air pressure while the spring brake chamber (10) is made to accommodate the higher, first pressure. The use of the higher first pressure allows a stiffer actuator spring to be used and be fully deflected by the first pressure without substantially changing actuator piston areas and other elements of conventional combination brake actuators. A conventional modulated spring brake control valve (78) is used to supply air at the first pressure to the spring brake chamber. The service brake chamber is supplied with air at the second pressure through the outlet of a conventional service brake application valve (68).

Abstract: A vehicle brake system includes a check valve having an input port coupled to a fluid pump outlet and an output port coupled to hydraulically deactuated spring brakes through brake lines. A pilot check valve has a pilot port, an inlet port coupled to the input port of the check valve and a return port coupled to the fluid reservoir. The pilot port is coupled to the output port of the check valve so the pilot check valve opens only when the output port is pressurized. This allows hydraulic fluid to flow from the pump, through the pilot check valve and to the reservoir. To set the brakes when stopped or in emergency situations the operator actuates a valve which dumps the fluid in the brake lines into the reservoir. A second pilot check valve has its pilot port connected to a brake pedal actuated master cyinder, its inlet connected to the brake line and its outlet connected to the reservoir.

Abstract: A mechanical emergency and parking brake system, for vehicles of the type having a power steering pump, includes a check valve having an input port coupled to the pump outlet and an output port coupled to hydraulically deactuated spring brakes through brake lines. A pilot check valve has its inlet port coupled to the input port of the check valve and an output or return port coupled to the power steering gear. The pilot port of the pilot check valve is coupled to the output port of the check valve so that the pilot check valve opens only when the pressure at the output port of the check valve is above a chosen pressure. This allows hydraulic fluid to flow from the pump, through the pilot check valve, through the power steering gear and to the reservoir. To reapply the brakes, the operator actuates a valve which disconnects the brake ports from the output port of the check valve and connects the brake lines to the reservoir.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biases the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. An air supply system, including a quick release valve, a two way check valve, an emergency and parking air supply tank and a pilot check valve, in conjunction with a conventional quick release valve or another type of exhaust valve, automatically supplies air to the service brake chamber from the tank whenever the spring brake supply line is vented.

Abstract: A check relief valve particularly suited for use with corrosive fluids includes a body having an input port and an output port connecting a fluid passageway therebetween. A ring spring is mounted to the body along the fluid passageway. An annular sleeve is attached to the ring spring. A rod, having a sealing member at one end adapted to engage an annular edge of the sleeve, is lightly biased against the sleeve so that forward flowing fluid flows relatively unhindered while reverse fluid flow is checked. When the pressure at the output port is sufficiently greater than the pressure at the input port, the rod and moveable sleeve cause the ring spring to flex. After the rod has travelled a predetermined distance, movement of the rod is halted so that further movement of the sleeve breaks the seal with the sealing member to allow reverse flow of fluid. Also disclosed is a governor, which includes the check relief valve and pilot valve, for use between a pump, a system and a reservoir.

Abstract: An air brake system augments the braking force available while parking without interfering with the operation of the parking brakes. The brake system includes a service brake, a pilot check valve and, typically, a quick release valve. The quick release valve and pilot check valve are interconnected in two alternative ways among the service and spring brake lines and the service brake cylinder. When the spring brake line is pressurized the system acts normally. However, when the pressure on the spring brake line is eliminated the pilot check and quick release valves trap the pressurized air within the service brake. This keeps the service brake for each individual wheel actuated. Pressurizing the service brake line pressurizes the service brake regardless of the condition of the spring brake line. Safety valves can be incorporated in the brake systems to insure that the pressure within the service brake chamber does not exceed a predetermined value.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biasas the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. The collet can be moved towards and locked against the collet brake spring to prevent the collet from engaging the push rod. This allows the user to effectively deactuate the collet brake feature when desired, such as to mechanically release the push rod from the collet when the vehicle is stationary.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biases the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. An air supply system, including a quick release valve, a two way check valve, an emergency and parking air supply tank and a pilot check valve, in conjunction with a conventional quick release valve or another type of exhaust valve, automatically supplies air to the service brake chamber from the tank whenever the spring brake supply line is vented.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biases the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. Excessive force on brake drums, caused by cooling and contracting brake drums while parked, can be reduced by permitting the collet and push rod therewith to deflect when such excessive force occurs.