A regulating valve having anti-seize characteristics provides a linear drive system intermediate a drive shaft connected to a motor and a lifter connected to the regulator spring. The linear drive system translates the rotational motion of the drive shaft into preferably, linear only motion of the lifter, thereby preventing binding internal to the valve.

An aircraft fluid control valve is provided that includes a sleeve, a cap, first and second pistons, and first and second springs. The sleeve includes first and second inner chambers. Fluid inlet and outlet ports are disposed in the first sleeve wall. A high pressure reference port is in fluid communication with the base end and a low pressure reference port is in communication adjacent the cap end. The first piston has a center post, a base flange, and a piston head. The piston head is attached to the center post. The second piston (SP) has a SP center flange and a SP side wall. The SP side wall extends axially between a base end and a cap end. The first spring is disposed between the SP center flange and the cap. The second spring is disposed between the PH base flange and the SP center flange.

A fast-responding passive flow rate limiting valve for high pressure gas applications, the valve comprising a valve body having a flow passageway extending from an upstream end to a downstream end of the valve body. The flow passageway includes a first bore portion in the upstream end of the valve body in fluid communication with one or more ports spaced around an inner passageway in the upstream end of the valve body. The inner passageway and one or more ports extend to a body elongate bore which extends to the downstream end of the valve body. A poppet extends into and through the inner passageway and includes an inner bore having a plurality of poppet ports. In a poppet open position the poppet ports are unobstructed and open to the first bore portion and in a poppet closed position the poppet ports are within the inner passageway and at least partially obstructed. A spring, received within the body elongate bore, provides a spring force on the poppet in an upstream direction. The valve rapidly transitions from the open position to the closed position upon an upstream fluid pressure spike acting on the poppet causing a restriction to fluid flow and quickly limiting the flow rate through the valve.

A pressure control system configured to respond to high-pressure conditions in a fluid conduit is disclosed. The system generally includes first and second flow restrictors positionable inline on a fluid conduit and configured to block fluid flow in the conduit and respond to a high-pressure event to allow fluid flow therethrough. The first flow restrictor is position upstream from the second flow restrictor and may open to allow fluid flow in response to the high-pressure event. The second flow restrictor provides adjustable flow of fluid therethrough or may open a bypass line in response to the high-pressure event to allow unrestricted fluid flow therethrough.

An aircraft fluid control valve is provided that includes a sleeve, a cap, first and second pistons, and first and second springs. The sleeve includes first and second inner chambers. Fluid inlet and outlet ports are disposed in the first sleeve wall. A high pressure reference port is in fluid communication with the base end and a low pressure reference port is in communication adjacent the cap end. The first piston has a center post, a base flange, and a piston head. The piston head is attached to the center post. The second piston (SP) has a SP center flange and a SP side wall. The SP side wall extends axially between a base end and a cap end. The first spring is disposed between the SP center flange and the cap. The second spring is disposed between the PH base flange and the SP center flange.

Spring-loaded relief valves having guided seats are disclosed. A disclosed example apparatus for use with a relief valve includes a valve body having a first aperture with a first diameter and a second aperture with a second diameter greater than the first diameter, the first and second apertures arranged along a longitudinal direction of the valve body, a spindle extending through the first and second apertures, the spindle including a first portion guided by a first wall of the first aperture, and a second portion adjacent the first portion, the second portion guided by a second wall of the second aperture, and a valve seat supported by the spindle at the second portion of the spindle.

A valve assembly configured to perform a fluid service on a machine is disclosed herein. The valve assembly can include an inlet/outlet port fluidically coupling a fluid component to an internal cavity defined by the valve assembly, a filter port fluidically coupling the internal cavity to a filter of the machine, and a pressure regulating system. The pressure regulating system can include a plunger head configured to transition between an open position and a closed position, a plunger head seat, and a spring comprising a spring constant configured to bias the plunger head in the open position, wherein the spring constant is configured to be overcome in response to a predetermined pressure within the machine.

A valve assembly configured to perform a fluid service on a machine is disclosed herein. The valve assembly can include an inlet/outlet port fluidically coupling a fluid component to an internal cavity defined by the valve assembly, a filter port fluidically coupling the internal cavity to a filter of the machine, and a pressure regulating system. The pressure regulating system can include a plunger head configured to transition between an open position and a closed position, a plunger head seat, and a spring comprising a spring constant configured to bias the plunger head in the open position, wherein the spring constant is configured to be overcome in response to a predetermined pressure within the machine.

A chromatography valve for use in fluid analysis and chromatography applications is provided. The valve includes a first body having passages extending therethrough and opening on a flat face of the first body at respective passage ports. The valve also includes a second body engaged with the first body in a sealed relationship, whereby one of the first and second bodies is movable relative to the other one between two or more positions for controlling fluid circulation through the passages. The second body includes at least one cartridge receiving cavity for receiving at least one cartridge removably provided therein. The cartridge has channel(s) for channeling fluid of pairs of the passage ports, depending on the position of the first body relative to the second body, thereby channeling fluid through selected ones of the passages via the at least one channel. A method of operating the valve is also provided.

A valve assembly configured to perform a fluid service on a machine is disclosed herein. The valve assembly can include an inlet/outlet port fluidically coupling a fluid component to an internal cavity defined by the valve assembly, a filter port fluidically coupling the internal cavity to a filter of the machine, and a pressure regulating system. The pressure regulating system can include a plunger head configured to transition between an open position and a closed position, a plunger head seat, and a spring comprising a spring constant configured to bias the plunger head in the open position, wherein the spring constant is configured to be overcome in response to a predetermined pressure within the machine.