A wind turbine having a nacelle, with at least one liquid circuit with a coolant, a cooling section for cooling a component of the wind turbine using the coolant, a cooler for cooling the coolant, a piping system for conveying the coolant and an expansion tank for obtaining an operating pressure of the liquid circuit, wherein the expansion tank establishes a pressure in the liquid circuit using static pressure of a liquid column.

A hydraulic fluid expansion tank is located inside a housing of a drive device and includes an upper check valve and a lower check valve in communication with a sump located within the drive device and an internal volume of the expansion tank. The tank may also include a vent opening in communication with a vent of the drive device that is in communication with atmospheric pressure.

Embodiments relate generally to systems and methods for normalizing the pressure proximate to a gas sensor within a gas detector. A rectifier assembly for use with a gas detector may comprise a flow barrier; a first valve connected to the flow barrier configured to open to normalize the pressure proximate to the gas sensor; a second valve connected to the flow barrier configured to open to allow airflow from the pump toward the gas sensor; and one or more retainer rings configured to position the first valve, second valve, and flow barrier with respect to one another, and configured to position the rectifier assembly within a cavity of the gas detector, wherein the rectifier assembly is configured to be located between a pump and at least one gas sensor of the gas detector; and wherein the rectifier assembly is configured to normalize pressure proximate to the gas sensor.

A pressure compensation device for compensating an internal pressure in a housing of an electrochemical device includes: at least one gas-permeable membrane for gas exchange between an interior of the housing and surroundings of the electrochemical device; and a valve body that can be transferred from a home position resting on a valve seat into a use position remote from the valve seat, the valve body including a gas throughflow opening that is sealed by the gas-permeable membrane.

A pressure compensation device for compensating an internal pressure in a housing of an electrochemical device includes: at least one gas-permeable membrane for gas exchange between an interior of the housing and surroundings of the electrochemical device; and a valve body that can be transferred from a home position resting on a valve seat into a use position remote from the valve seat, the valve body including a gas throughflow opening that is sealed by the gas-permeable membrane.

A P/V valve that can be positioned at a working height above grade (i.e., a height reachable by a service technician positioned at grade) while still providing appropriate resistance to fire and explosion by venting to atmosphere at an appropriate height above grade (e.g., 12 feet) is disclosed. In certain exemplifications of the present disclosure, the P/V valve features a diaphragm actuated two-way poppet valve actuatable by a valve piston. In alternative exemplifications of the present disclosure, the P/V valve is positioned intermediate grade and the distal end of a P/V valve riser pipe and is contained in a vault fluidly connected to the P/V valve riser pipe, the P/V valve locally venting in the vault, which is hermetically sealed to the P/V valve riser pipe.

A P/V valve that can be positioned at a working height above grade (i.e., a height reachable by a service technician positioned at grade) while still providing appropriate resistance to fire and explosion by venting to atmosphere at an appropriate height above grade (e.g., 12 feet) is disclosed. In certain exemplifications of the present disclosure, the P/V valve features a diaphragm actuated two-way poppet valve actuatable by a valve piston. In alternative exemplifications of the present disclosure, the P/V valve is positioned intermediate grade and the distal end of a P/V valve riser pipe and is contained in a vault fluidly connected to the P/V valve riser pipe, the P/V valve locally venting in the vault, which is hermetically sealed to the P/V valve riser pipe.

A device for restricting liquid backflow through an overhead line on a tank and a method of using the device are provided. The device has a tubular housing with spaced internal baffle plates. The device is secured in place in the interior of an overhead pipe on the top of a tank on a tank truck or other vehicle used for transporting bulk liquid cargo. The device prevents liquid backflow from entering overhead piping due to sloshing action of the liquid during transport. The device allows air to flow through the device so that air may be supplied to the tank, as well as vented from the tank, through the device.

A device for restricting liquid backflow through an overhead line on a tank and a method of using the device are provided. The device has a tubular housing with spaced internal baffle plates. The device is secured in place in the interior of an overhead pipe on the top of a tank on a tank truck or other vehicle used for transporting bulk liquid cargo. The device prevents liquid backflow from entering overhead piping due to sloshing action of the liquid during transport. The device allows air to flow through the device so that air may be supplied to the tank, as well as vented from the tank, through the device.

A valve with a valve seat and a valve disk has the valve disk configured such that it can be brought into a first position in which it is in contact with the valve seat where the valve is closed, and can be brought into a second position in which the valve is open. The valve has at least one spring element, and the valve seat can be displaced against a force exerted by the at least one spring element by bringing the valve disk from the second position into the first position and thereby deforming the spring element.