Abstract: A control system for a machine is disclosed. The control system may have a bypass passage situated to allow fluid to bypass an actuator, and a warmup valve disposed within the bypass passage that is movable between flow-passing and-blocking positions. A controller is configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, compare the pressure of the fluid of the actuator with a threshold, and move the warmup valve to the flow-blocking position and reduce a pump outlet pressure when the pressure of the fluid is greater than the threshold. The controller may be configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, and adjust an input speed of the pump in response to the signal.

Abstract: A system can include one or more valve arrangements with a working chamber to receive a working fluid at a first pressure, and a control chamber to receive fluid at a second pressure. A dynamic seal can be disposed on a land of a valve element. A supply passage can be in communication between the control chamber and a tank and can include a check valve. A relief valve can be disposed between the check valve and the control chamber. A pilot pump and another relief valve may be disposed upstream of the check valve. The relief valve downstream of the check valve can have a higher pressure limit than the downstream one. A pressure sensor may be disposed between the check valve and the control chamber and used to warn the operator of a high pressure in the control chamber.

Abstract: An improved hydraulic engine mount includes a main rubber element of one piece construction. The main rubber element includes an upper portion, an intermediate portion, and a lower portion. The lower portion includes an interlocking seal portion. The hydraulic engine mount includes an upper housing and a lower housing. The interlocking seal portion includes an upper protrusion operable to fit within an upper groove of the upper housing to fit together to form a tight locking seal. The upper housing further includes an upper protrusion operable to connect to an upper groove of the main rubber element. The upper groove of the main rubber element is annular and extends around the lower portion of the main rubber element. The lower portion of the main rubber element further includes a generally axially extending second protrusion abutting both the upper housing and the lower housing.

Abstract: A stabilizing weight for use with a survey instrument stand includes a pouch having weight receiving openings therein. The pouch includes closure structure positioned to close the weight receiving openings after a plurality of weight elements are positioned in the weight receiving openings. An attaching device is affixed to the pouch and formed to secure the pouch to a component of the survey instrument stand, such as a leg, etc.

Abstract: An improved hydraulic engine mount includes a main rubber element of one piece construction. The main rubber element includes an upper portion, an intermediate portion, and a lower portion. The lower portion includes an interlocking seal portion. The hydraulic engine mount includes an upper housing and a lower housing. The interlocking seal portion includes an upper protrusion operable to fit within an upper groove of the upper housing to fit together to form a tight locking seal. The upper housing further includes an upper protrusion operable to connect to an upper groove of the main rubber element. The upper groove of the main rubber element is annular and extends around the lower portion of the main rubber element. The lower portion of the main rubber element further includes a generally axially extending second protrusion abutting both the upper housing and the lower housing.

Abstract: A combined digital signature is method of making a single public key digital signature on a number of messages, such that individual combined signatures may be extracted and individually presented. The mechanism of a combined digital signature is a combination of a hash tree whose leaves correspond to messages, together with a cryptographic signature made on the root of that hash tree. The invention comprises a method of making a combined signature, a method of extracting individual combined signatures, a method of verifying individual combined signatures, and the data format of an individual combined signature. The invention can increase performance of signature-making by a factor of several hundred over previous art.

Abstract: A dual fuel burner for a gas turbine engine comprises a gas fuel manifold and ducts opening into a central air passage, a liquid fuel manifold and tangentially arranged apertures opening into an annular liquid fuel passage terminating in an annular nozzle. The central air passage has an upstream swirler, and is arranged to receive a flow of compressed air at its upstream end and to discharge a flow of compressed air and either gaseous or liquid fuel from its downstream end. The burner also has a water manifold so that water can be injected into the fuel and air flow via ducts and an annular air passage, to control NOx emission.In an alternative arrangement, the liquid fuel can be injected into the annular air passage.The burner is intended to operate on a range of high calorific fuels, both liquid and gaseous, and is designed to minimize the surface area on which carbon may accumulate during operation.

Abstract: A gas turbine engine fuel injector which burns liquid and gaseous fuel and also has a water injection system to reduce the formation of nitrogen oxides (NO.sub.x). The water can be discharged into a combustion chamber through an annular nozzle which is located between an inner annular fuel and air discharge nozzle and an outer gas discharge nozzle which comprises a circumferential row of discrete discharge nozzles. This allows the water to be injected at the most suitable point whichever fuel is being burnt. The water can also be injected into the inner annular fuel and air discharge nozzle.

Abstract: A dual fuel injector for a gas turbine engine having means for water injection to reduce NOx emissions, comprises an outer annular gas fuel duct with a venturi section with air purge holes to prevent liquid fuel entering the gas duct, an inner annular liquid fuel duct having inlets for water and liquid fuel and through which compressor air flows, the inner annular duct terminating in a nozzle, and a central flow passage through which compressor air also flows, terminating in a main diffuser having an inner secondary diffuser. The surfaces of both diffusers are arranged so that their surfaces are washed by the compressor air to reduce or prevent the acretion of carbon to the injector, the diffusers in effect forming a hollow pintle.