Multi-stage back pressure regulators are disclosed herein. In one embodiment, a multi-stage back pressure regulator includes a first stage and a second stage downstream from the first stage. The first stage includes a gas-charged regulator device arranged to receive a fluid at an inlet, and the second stage includes a spring-loaded regulator device having an outlet in fluid communication with the inlet. The gas-charged regulator and the spring-loaded regulator are configured to control inlet pressure to the back pressure regulator and maximum differential pressures across the first and second stages.

An arrangement for managing a liquid medium, such as water, combines a pressure-reducing valve with two backflow prevention valves. Both the pressure-reducing valve and the two backflow prevention valves may be integrated into a common housing, specifically with both backflow prevention valves in an inlet chamber of the housing, wherein the inlet chamber and an outlet chamber of the housing are either fluidly coupled or isolated from one another by the pressure-reducing valve depending on the outlet chamber pressure prevailing in the outlet chamber. In some instances, a manually actuatable shut-off valve may be integrated into the housing. The manually actuatable shut-off valve may selectively keep the pressure-reducing valve in a closed position or allow the automatic opening and closing of the pressure-reducing valve depending on the outlet chamber pressure prevailing in the outlet chamber.

A pilot operated piston oil cooling jet control valve configured to be in communication with a main oil galley, an oil pan, and a cooling jet is provided. The pilot operated piston oil cooling jet control valve includes a valve body, a pilot valve, and a main stage poppet. The pilot valve is arranged within the valve body and includes a solenoid armature movable between a first position and a second position and a pilot poppet movable between a pilot open position where flow is provided to the oil pan and a pilot closed position where flow is inhibited to the oil pan. The main stage poppet is arranged within the valve body and is movable between a closed position where flow is inhibited to the cooling jet and an open position where flow is provided to the cooling jet.

A column packing apparatus includes a tubular structure, a packing material supplier disposed on one end of the tubular structure for permitting a packing material slurry formed by a packing material dispersed in a solvent to be packed into the tubular structure, and a packing controller disposed on the other end of the tubular structure for determining the flow rate and pressure of the packing material slurry formed by the packing material being packed so that they can be maintained at predetermined flow rate and pressure level. A column packing method includes the steps of providing a packing controller disposed on the other end of the tubular structure, and permitting the packing controller to variably adjust the flow rate and pressure of the packing material slurry so that they can be maintained at the predetermined flow rate and pressure level.

Control systems include various combinations of pressure regulators, pilots, and pressure stabilizers to provide systems with adjustable deadbands for over pressure protection, adjustable deadbands for under pressure protection, adjustable deadbands for both over pressure and under pressure protection, pressure assisted closure for over pressure protection, pressure assisted closure for under pressure protection, pressure assisted closure for both over pressure and under pressure protection, or spring assisted closure for over pressure and under pressure protection.

A floodwater redistribution assembly for redirecting flood waters to a predetermined location for irrigation and municipal water service includes a subterranean vault that is positioned adjacent to a body of water known for periodic flooding. An inlet pipe is integrated into the subterranean vault to direct the water from the body of water into the subterranean vault. An outlet pipe is integrated into the subterranean vault to direct the water outwardly to a predetermined location for the purposes of irrigation and municipal water service. A ball valve is positioned within the subterranean vault to facilitate the water to flow into the outlet pipe. A ball valve control unit is coupled to the ball valve. The ball valve control unit is in remote communication with a remote control source and the ball valve control unit actuates the ball valve between an open position and a closed position.

A back pressure regulator (“BPR”) includes a pressure housing that at least partially defines a flow chamber that the liquid flows through and the BPR has an adjustable restriction that varies with the flow rate to maintain an upstream liquid pressure. The pressure housing is contoured to distribute the liquid flow to provide radial flow into the adjustable restriction from circumferentially about the adjustable restriction. The pressure housing includes ramped and curved side passages that guide the flow and ridges that divide the flow and prevent internal collisions between the flow. A flow deflector extends into the chamber outlet to prevent the radial flows through the annular restriction from colliding. The flow deflector redirects the flows to smoothly recombine in the chamber outlet.

A controller includes an opening degree control section configured to control a valve element opening degree of the valve main body based on a pressure measurement value of the vacuum chamber measured by a vacuum meter, and an estimation section configured to estimate measurement lag information of pressure measurement value with respect to a pressure of the vacuum chamber based on (a) an exhaust expression including a second-order derivative term of the pressure measurement value and indicating a relationship between an effective exhaust speed of a vacuum pumping system for the vacuum chamber and the pressure measurement value and (b) a pressure measurement value measured during a pressure response when the valve element opening degree is step-changed, and the opening degree control section controls the valve element opening degree based on the measurement lag information estimated by the estimation section.

A control system having a first pressure regulator, a downstream fluid control device, first pilot, and second pilot. The first pressure regulator has a fluid inlet, fluid outlet, and actuator assembly with a cavity divided into a first chamber and a second chamber. The downstream fluid control device has a second fluid inlet and a second fluid outlet. The first pilot has a first setpoint and the second pilot has a second setpoint, less than the first setpoint. The first and second pilots fluidly couple the second chamber to the second fluid outlet in a first mode of operation, isolate the second chamber from the second fluid outlet in a second mode of operation, and fluidly couple the second chamber to the fluid inlet in a third mode of operation.

A vacuum regulator device having a vacuum regulator and a vacuum gauge on a housing line that is configured to be in fluid communication with a patient include an electronic valve that selectively opens and closes the housing line. The vacuum gauge is located between the vacuum regulator and the patient and includes an electronic flow sensor upstream. The electronic flow sensor provides feedback to the vacuum regulator.