Abstract: A gas turbine engine comprising a variable geometry combustor having pilot fuel injectors and main fuel injectors; a fuel metering system configured to control fuel flow to the pilot fuel injectors and the main fuel injectors; a variable geometry airflow arrangement for the variable geometry combustor, which is configured to vary the airflow through the pilot fuel injectors and/or the main fuel injectors; a control system configured to control the variable geometry airflow arrangement in dependence upon airflow delivered to the combustor, the fuel flow to the pilot fuel injectors and the main fuel injectors, and a target index of soot emissions, thereby controlling airflow through the pilot fuel injectors and/or the main fuel injectors and hence the quantity of soot produced by combustion.

Abstract: A drain valve includes an inlet plenum, a first orifice downstream from the inlet plenum, a second orifice downstream from the first orifice, and a fluid passage between the first and second orifices. A piston having a first position and a second position has a first surface area exposed to the fluid passage when the piston is in the first and second positions and a second surface area exposed to the inlet plenum when the piston is in the second position.

Abstract: Delayed valve of the type comprising a water entrance (2), a water exit (3), a plunger (6) supporting a shutter (5) and comprising a tubular tail (8) passing through the seat (4) in a sealed manner and comprising, at least, an opening (9) through which water can penetrate when the shutter is moved away from its seat and an exit opening (8a), characterized in that the raising of the shutter is controlled by the pressing down of a pressing button (10) the internal end of which is conformed to obturate the exit opening (8a) of the tail (8), said pressing button being submitted to the action of a counter spring (11).

Abstract: The disclosure relates to a method for commissioning pneumatically operated actuators that are controlled by a positioner. To determine the drive type, a constant flow of pneumatic fluid is applied to the actuator during commissioning while a drive-specific characteristic curve of the fed back position is recorded over time. Then the measured characteristic curve is compared with a given specimen characteristic curve. The drive type is inferred from the level of difference or agreement between the drive-specific characteristic curve and the specimen characteristic curve.

Abstract: Drill string flow control valves and more particularly, drill string flow control valves for prevention of u-tubing of fluid flow in drill strings are provided. Drill string flow control valves may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a piston axially movable within said valve housing and bearing against the valve sleeve, a biasing mechanism for biasing the valve sleeve into the closed position, a static pressure port for actuating said piston utilizing internal fluid pressure within said valve and a plurality of dynamic pressure ports for allowing a differential pressure to be exerted on the valve sleeve during dynamic flow conditions. The differential pressure exerted on the valve sleeve may be the result of an upstream pressure and a downstream pressure during fluid flow through said valve.

Abstract: Drill string flow control valves and more particularly, drill string flow control valves for prevention of u-tubing of fluid flow in drill strings are provided. Drill string flow control valves may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a piston axially movable within said valve housing and bearing against the valve sleeve, a biasing mechanism for biasing the valve sleeve into the closed position, a static pressure port for actuating said piston utilizing internal fluid pressure within said valve and a plurality of dynamic pressure ports for allowing a differential pressure to be exerted on the valve sleeve during dynamic flow conditions. The differential pressure exerted on the valve sleeve may be the result of an upstream pressure and a downstream pressure during fluid flow through said valve.

Abstract: A metering valve includes a main valve and a pilot valve for operating the main valve. A low operating force pawl and ratchet system rotates a cam to open the pilot valve to initiate a cycle of operation. When the main valve is opened, a turbine wheel in the flow path rotates to measure flow. Turbine rotation is transmitted to the cam through a reducing gear assembly and a lost motion connection in order to reclose the pilot and main valves after a predetermined volume of flow is measured.

Abstract: Provision of an abnormality detection and suppression system for a valve apparatus, which is capable of detecting abnormal states such as leakage through valve seats or a gland/packing assembly and coping with the abnormality while ensuring protection for the valve apparatus by controlling a driving unit for a valve stem on the basis of information as detected, by means of a vibration sensor, a temperature sensor and a strain sensor are disposed internally of a valve stem 4 at a portion thereof which lies outside of a valve casing of the valve apparatus.

Abstract: A water closet valve, automatically closed, following the passage of a predetermined quantity of water therethrough, includes a cylindrical housing having an inlet valve and water passageway at its depending end, is mounted within a water closet on its bottom wall. A manually triggered control wheel unseats the valve by a cam surface on the control wheel which permits water to enter the cylindrical housing and drive a water wheel, in turn driving a gear train connected with the control wheel for angular rotation of the control wheel and its camming surface to a valve closed position after a predetermined number of revolutions of the gears of the gear train.

Abstract: A ball clutch mechanism couples a faucet knob to the splined end of a valve stem for releasing the valve stem when the knob is fully depressed. A dashpot damped return spring urges the valve stem toward valve closed position when the clutch mechanism releases. The same dashpot controlled return spring closes the valve if the knob is released either before or after full travel inward. Rotation of the knob rotates the valve stem to determine water temperature by mixing hot and cold supplies. Check valves control passages that are provided to vent the lines during fluid flow and to drain the lines when the system is serviced.

Abstract: A fluid metering device (10) is provided for automatically restricting (i.e., shutting off or reducing) fluid flow to a filter (16). The metering device (10) has a vane (32) which turns as fluid flows and thereby drives a gear (92). Once the vane (32) has rotated a selected number of times, as a result of the fluid flow, the rotation of the gear will break a frangible link (82), causing the fluid flow to stop or reduce by closing a valve (60). The customer will know to replace the filter (16) when the fluid no longer flows or is substantially reduced, and the customer will also have to replace the frangible link (82) to enable the fluid to flow at full volume again.

Abstract: A control valve for a self-emptying centrifuge drum for draining closure fluid out of a closure chamber positioned below an axially movable piston slide with a valve piston that closes the closure-fluid runoff bores by means of centrifugal force and opens them by supplying control fluid to an initial control chamber that has an inlet and an outlet. To improve the known control valve to the extent that it will close more rapidly, making the amount of solids extracted at each emptying more constant, another control chamber, also having an inlet and an outlet, but in which the active face of the piston is larger than that of the piston in the initial control chamber, is provided, with the volumes of the control chambers and the cross-sections of the inlets and outlet ensuring that the initial control chamber is filled first and the second control chamber only after a delay.

Abstract: An improved, remote controlled valve and dual push button assembly, having a hand operated push button which, when depressed and released, opens a water valve for a predetermined length of time after which the valve closes. The valve is also connected to a foot operated push button which, when depressed, holds the valve in an open configuration as long as the foot button is depressed. The improved valve and button assembly provides an air flow path through the foot button when the foot button is not depressed. The air flow path utilizes a hole in a diaphragm of the foot button which communicates with an air flow path in the base of the piston which depresses the foot button diaphragm. The disclosure also includes a check valve held in the needle valve which is a part of the timing mechanism of the hand operated button. The check valve prevents the flow of air out through the needle valve and permits air to only flow in through the needle valve.

Abstract: A timer-controlled valve comprises a valve member movable from a home position to an actuated position with respect to a passageway in the valve housing, an operator manually movable from a home position to a plurality of preselected actuated positions to preselect a predetermined time interval, the operator being coupled to the valve member so that the latter moves therewith, and a dashpot device for returning the operator from its preselected actuated position to its home position after the elapse of a predetermined time interval, the valve member also being returned to its home position with the operator.

Abstract: This invention describes a pneumatic timing valve, in which one end of a plunger projects into a chamber in constant communication with the atmosphere and is displaced by fluid means into its operating position against a return spring force, an incoming pneumatic pressure signal initially being vented via the chamber. A shutter element situated in the chamber and controlled as regards time by another spring force and a restrictor system, neutralizes the venting of the pressure signal after expiration of a preset delay period, to generate a control signal. The restrictor system is separately in communication with the atmosphere and comprises a restrictor path adjustable in its effective length. In order that shorter time-lags may be set precisely within a comparatively large delay range, the invention provides that the operating position of the plunger is adjustable.

Abstract: A valve assembly in an air brake truck system which meets minimum response time specifications required by authorities and the maximum response rate required by the wheel lock control system for efficient operation. The valve assembly varies the effective orifice size between the air supply inlet and the outlet to the relay valve. The high minimum specified rate is provided for a short period of time for initial response and the lower maximum rate for efficient operation is provided for the remainder of the stop. The valve assembly has a timing section and a variable orifice section.