A bi-directional vent for a fuel tank utilizes a resilient sealing member which in its unflexed state is a simple resilient washer. The sealing member is disposed inside a vent body, and forms both an inner and outer seal. The inner seal is formed between an inner circumferential edge on a central hole in the washer and a conical sealing surface attached to the vent body. The outer seal is formed between an outer annular sealing surface on the washer and a circumferential edge formed on a central opening in the vent body. Increased pressure in the tank causes the sealing member to deflect at its inner portion away from the circumferential edge on the vent body, resulting in outward venting. Reduced pressure in the tank causes the outer part of the sealing member to deflect away from the conical seating surface, resulting in inward venting.
A breather valve connected to a breather passage for opening and closing a valve element to adjust the internal pressure of a sealed container corresponding to the pressure change inside the sealed container includes a valve bore, the valve element slidably fitted in the valve bore, a spring for pushing the valve element toward the sealed container, an elastic portion tapering toward the sealed container, a slit formed at the free end of the elastic portion, and a needle member extending from the side opposite to the sealed container toward the slit. Plastic deformation caused by pressure reduction inside the sealed container opens the slit while the needle member projects through and opens the slit when increase of the internal pressure of the sealed container pushes the valve element against the pressure of the spring.
A liquid tank cap incorporates a two-way relief valve in which an annular valve disc has one side sealed against a seal adjacent to its inner diameter and the other side sealed against a seal adjacent to its outside diameter. When subjected to a pressure differential in either direction, the disc deflects so as to increase its concavity and allow air passage by one or the other seal, depending upon whether the pressure in the tank is subatmospheric or superatmospheric.
A sealing valve arrangement (12) for a container containing a fluid, wherein a supporting element (14) comprising a control channel (15) in the border region of the supporting element (14) and a securing element (16) comprising a passage channel (18) are disposed on top of one another over the fluid storage (13') of the container. A sealing valve (1) having smaller radial dimensions than these elements (14, 16) and a valve channel (2) for connecting the control channel (15) and the passage channel (18) are provided between the supporting element (14) and the securing element (17), wherein the sealing valve (1) comprises a first sealing surface or edge (5) for sealing the passage channel (18) from the control channel (15) and a second sealing surface or edge (8) for sealing the valve channel (2) from the control channel (15). The sealing valve (1) operates in case of pressure above atmospheric and sub-atmospheric pressure within the fluid storage (13').
A plastic vent valve (1) for containers for transporting and storing liquids has a cylindrical valve housing(2) which is made as a threaded plug (3) and is screwed onto a screw cover (8) for closing an opening of a plastic inner container of a palletized container. The valve has a valve membrane (4), a surge disk (5), a surge cover (6), and a sealing cap (7).
An IV manifold includes a plurality of injection/aspiration ports and has an elongate configuration with a width greater than the diameter of the ports. A flow channel is formed between mating members of a housing and provided with a U-shaped configuration. Projections along the flow channel direct fluid flow into valve cavities associated with the ports to clear dead spots around the valve elements. A check valve included in the manifold tends to direct high pressures against the valve elements which respond by forming surface seals thereby avoiding deformation. An aspiration port can be formed with a second seal disposed on the side of the valve element opposite the first seal. Opening this second seal by negative pressure in the lumen of the port provides for the aspiration of fluids in the flow channel. Two-way aspiration can be provided by a valve having a cage with or without compressible characteristics to accommodate low tolerance fittings.
