A vent valve includes an outer frame, a ventilation box movable in the outer frame, a sealing cover, a buoyant box and elongate sliding members. The ventilation box has an interior space. The sealing cover has a cover opening, and closes/opens a surrounding space defined by the ventilation box and the outer frame. The buoyant box is disposed within the interior space. When the buoyant box abuts the sealing cover and closes the cover opening, the cover opening is disconnected from the interior space. When the buoyant box moves away from the sealing cover, the interior space communicates the cover opening. The sliding members slidingly contact the outer frame and ventilation box to guide sliding movements.

An actuator of an environmental control system of a building including a motor and a drive device driven by the motor and configured to drive a valve within a range of positions. The actuator includes one or more printed circuit boards including one or more processing circuits configured to obtain a raw measurement data set from transducers and generate a flow signal based on the raw measurement data set. The flow signal indicates a flow rate of a fluid through a conduit. The one or more processing circuits are configured to determine an actuator position setpoint based on a flow rate setpoint and the flow signal and operate the motor to drive the drive device to the actuator position setpoint. The motor, the drive device, and the one or more printed circuit boards are located within a common device chassis.

A valve includes a first inline compartment to attach to a first return line exiting a processing chamber and a second inline compartment to attach to a second return line entering a coolant source. A flow compartment is attached between the first inline compartment and the second inline compartment and through which a coolant is to return to the coolant source. A first inlet orifice and a second inlet orifice positioned between the first inline compartment and the flow compartment. A plunger has a tip to variably open and close the second inlet orifice. A shape memory alloy (SMA) spring is positioned on the plunger and attached to the tip, the SMA spring to variably increase or decrease a flow rate of the coolant through the second inlet orifice according to a temperature of the coolant.

A damped check valve having multi-pressure operation is provided. The check valve includes a liner with a poppet movable within the liner. The liner defines a flow passage aligned along a longitudinal axis defined by the liner. A biasing element is operably coupled between the poppet and the liner to bias a first flow face of the poppet against an annular seat. The first flow face is configured such that a first fluid pressure is required to move the poppet from the closed position to an open position wherein the poppet is unseated from the annular seat and a second fluid pressure is required to hold the poppet in the open position, the second pressure being less than the first pressure. There is a sufficient diametrical clearance between the poppet and the liner which allows for flow control at pressures which are less than the initial opening pressure.

A mechanical shutdown valve for preventing an over pressure condition is described. A valve body has an inlet, an outlet, and a channel extending from the inlet to the outlet. A valve seat and a diaphragm are positioned in the valve body. The diaphragm controls a fluid flow through the valve body. A mesh is coupled to the diaphragm such that the mesh and the diaphragm separate an upstream portion of the channel from a downstream portion of the channel. The mesh extends from the diaphragm to an inner surface of the valve body and limits fluid flow between the diaphragm and the valve body. A spring biases the diaphragm towards the open position. A characteristic of the spring determines a differential pressure threshold between the upstream portion of the channel and a downstream portion of the channel at which the diaphragm engages the valve seat.

A transmission includes an oil sump and at least one oil bunker arranged separated from the oil sump within the transmission. The transmission includes a valve having a channel body, at least one sump port, at least one bunker port, and a mechanical actuating element. The channel body has at least one oil duct. The at least one oil duct connects the at least one bunker port to the at least one sump port. The mechanical actuating element is configured for temperature-dependently deforming to transfer the valve out of a closed position into at least one open position. The at least one oil bunker is connected to the oil sump via the valve when the valve is in the at least one open state. The at least one oil bunker is not connected to the oil sump via the valve when the valve is in the closed state.

Apparatuses, systems, and methods are disclosed for fluid flow control. A container is shaped to receive a liquid. An inlet is configured to allow the liquid to enter the container. An outlet is configured to allow the liquid to exit the container. A float is disposed within the container. A valve is actuated based on a position of the float within the container to open the valve at a first liquid level within the container and to close the valve at a different liquid level within the container.

A resistivity regulating apparatus includes: a gas dissolving device that causes a regulating gas to dissolve in a liquid targeted for resistivity regulation to generate a treated liquid in which the regulating gas is dissolved in the liquid, the regulating gas being used to regulate a resistivity of the liquid; and a buffer tank to which the treated liquid discharged from the gas dissolving device is fed.

A resistivity regulating apparatus includes: a gas dissolving device that causes a regulating gas to dissolve in a liquid targeted for resistivity regulation to generate a treated liquid in which the regulating gas is dissolved in the liquid, the regulating gas being used to regulate a resistivity of the liquid; and a buffer tank to which the treated liquid discharged from the gas dissolving device is fed.

A regulator valve assembly for a compressed fluid source may comprise a valve housing defining a main fluid channel, a secondary fluid channel, a primary outlet, a primary inlet, and a secondary inlet. A poppet may be located in the main fluid channel, The poppet may define a poppet channel and a poppet outlet. The poppet channel may be fluidly connected to the secondary inlet. A rod may be configured to translate in and out the poppet outlet. A pin may be biased toward the secondary fluid channel. The pin may be configured to translate into a translation path of the rod. A solenoid valve may be configured to control a flow of fluid into the secondary fluid channel.