This disclosure provides apparatus and methods for watering livestock using a livestock waterer, a water source, and a waterer valve system for replenishing water in a water reservoir of the livestock waterer. A valve housing can be affixed to the water reservoir and coupled to a plunger. A cam can be pivotably coupled to the valve housing and one end of a float arm. A float component can be coupled to the opposite end of the float arm. Water from the water supply can enter the valve housing and exit an orifice in the valve housing along first and second side spouts. The float component can have a generally flat bottom and move vertically along with the water level within the water reservoir. As the float component moves vertically, the float arm pivots the cam. The cam can move the plunger in the valve housing to stop water flow.

A valve has a valve housing with a valve seat and a valve body holder with a fluid-permeable flow opening. A valve body is arranged in the valve body holder and axially displaceable between an open state and a closed state of the valve. The valve body has an envelope surface with a sealing region for fluid-tightly contacting the valve seat in the closed state. It has a base region adjoining the sealing region in longitudinal direction. A cross section contour of the envelope surface increases monotonously from the sealing region to the base region. In the open state, an axial end of the base region contacts the valve body holder. The envelope surface has a weakened region connecting sealing region and base region to each other. The weakened region has a reduced stiffness along the longitudinal direction. The valve body is formed of a thermoplastic polyhalogen olefin.

A backflow preventer adapted for installation in an inner conduit of a hose coupling of a hydrant is disclosed. The backflow preventer contains a non-return device having a closing body, a seal seat, and a resetting device. The resetting device is adapted to resiliently pretension the closing body into sealing engagement against the seal seat.

A valve has a valve housing with a valve seat and a valve body holder with a fluid-permeable flow opening. A valve body is arranged in the valve body holder and axially displaceable between an open state and a closed state of the valve. The valve body has an envelope surface with a sealing region for fluid-tightly contacting the valve seat in the closed state. It has a base region adjoining the sealing region in longitudinal direction. A cross section contour of the envelope surface increases monotonously from the sealing region to the base region. In the open state, an axial end of the base region contacts the valve body holder. The envelope surface has a weakened region connecting sealing region and base region to each other. The weakened region has a reduced stiffness along the longitudinal direction. The valve body is formed of a thermoplastic polyhalogen olefin.

A system for delivering an amount of fluid medium includes an injector, a delivery catheter and a pulsatile generator. The injector is configured for injecting the fluid medium during an injection cycle. The delivery catheter includes a conduit for delivering the fluid medium. The pulsatile generator is configured to apply a pulsatile force on the fluid medium delivered through the delivery catheter at a pulsation frequency. The pulsatile force is defined by a plurality of duty cycles during the injection cycle, each of the plurality of duty cycles including a first flow level and a second flow level that is lower than the first flow level. The pulsation frequency is 3 or more duty cycles per second.

The present disclosure provides a backflow prevention device, comprising: an inlet chamber comprising at least two ports, in which a first port is used for receiving a fluid; a chamber-separating component comprising a separating member and a relief valve; an outlet chamber separated from the inlet chamber by the separating member; the relief valve being operatively connected with the separating member for opening or closing a drain port of the outlet chamber; wherein the fluid is allowed to be delivered from the outlet chamber only when the relief valve is closed by means of a differential pressure applied on the separating member. Also provided is a dialysis apparatus comprising the backflow prevention device. According to the present disclosure, the backflow prevention device has simple structure, reduced dead space and small sizes and can work reliably.

The present invention relates to an air admittance valve (AAV) that operates automatically at low pressures to selectively open and close an air passageway between an inlet and an outlet. The AAV comprises a valve body having a centrally disposed, internal valve chamber in communication with the ambient environment, and having a valve seat. The AAV includes a sealing member having a flexible diaphragm that is fastened to a support ring, the ring defining one or more lugs on an outer periphery thereof. The AAV further includes a cap member within which the sealing member may be disposed, such that the one or more lugs may interact with an interior surface of the cap. The sealing member may selectively seal or unseal from the valve seat in response to pressure differentials between the inlet and the outlet.

An infusion set check valve assembly includes a self-contained housing that defines inlet ports and an outlet port. The assembly also includes at least one check valve disposed within the self-contained housing between the outlet channel and at least one of the inlet ports. The at least one check valve is configured to open for a first fluid to flow from a first inlet to a patient line via an outlet channel while a second fluid also flows from a second inlet to the patient line via the outlet channel. The at least one check valve closes to prevent the first fluid from flowing to the patient line via the outlet channel while the second fluid flows to the patient line.

A resiliently mounted valve body has a sealing face and, by way of spring arms, is resiliently-elastically connected to a holding ring which encompasses the valve body in at least one position, so that the valve body is repositionable in a parallel manner in the axial direction. The holding ring is in one piece with and materially integral to a latching body for fastening a check valve element in a latching manner in a fluid-conducting installation of a check valve assembly. The latching body extends in the axial direction, facing away from the valve body, and has at least one latching protrusion which is resiliently-elastically repositionable in the radial direction.

The invention relates to a pressure oil filter system for a hydraulic transmission, in particular for a motor vehicle transmission, comprising at least one oil pump which can be actuated as required and which has a pressure side and a suction side, a pressure line to a consumer and at least a first oil filter which is arranged at the pressure side of the oil pump in the pressure line, wherein means for damping pressure surges during intermittent operation of the oil pump are provided in the pressure line upstream of the first oil filter in the flow direction of the oil.