A valve having a control means for the control of a fluid flow, such control means being able to be caused to move in two opposite switching directions. In order to render possible delay-free switching over after long periods of inactivity, a drive means is provided, which has spring means, which are tensioned when the control means is moved into a terminal switching position. The energy then stored is available for increasing the force during the next switching movement.

A valve for preventing fuel leaking from a fuel tank includes a housing that has a passage that communicates with the outside. In the housing there is a float that is used to open and close the passage by being moved axially along the housing. The valve is provided with a device to guide the float to close the passage. The device includes a gap formed between the housing and the float that increases in size with increasing distance from the passage.

A valve, which is particularly useful in the inlet system of a mass spectrometer, has a fluid inlet (60) and a fluid outlet (68). A valve seat (64) is disposed between the fluid inlet (60) and the fluid outlet (68), and a valve closure member in the form of a piston (62) sliding in a cylinder (60), and a diaphragm (56), is engageable with the valve seat. A chamber (77) for receiving coolant (e.g. liquid nitrogen) is located on the side of the diaphragm (56) opposite the valve seat (64), and by t...

A valve, especially a switch-over valve for large channel cross sections, is provided. A wing is pivotably mounted in a housing having channel connections. A fixating lever assembly provides for movement of the wing and includes a fixating lever and at least one link rod, one end of which is pivotably connected with the fixating lever while the other end is pivotably connected with the wing. A respective driver passes through and is mounted on opposite side walls of the housing. An inner end of ...

A valve, particularly suited for use with a patient ventilation system to regulate respiration gas flow to and from the lungs of a patient has a substantially parallel, co-axial, arrangement of inner and outer fluid flow passages for conducting gas through the valve to and from a common flow conduit connected to the patient's lungs, each passage having gas flowing therein in a different direction. A cuff is provided which is inflatable to control the flow of fluid through the valve. The cuff is ...

A valve for bringing gaseous fuel into the combustion chamber (1) of gas engines includes a solenoid valve (5) controlling the fuel supply (2) and an adjoining check valve (7) designed as a poppet valve, which is closed by the force of a spring and which opens in the direction of the combustion chamber through the pressure of gas flowing from the opened solenoid valve (5). The stem (11) of a poppet is connected to a step piston (12) on the side that faces away from the head (10) of the poppet wh...

A valve body having a circular throat and three vanes mounted for rotation within the circular throat of the valve body. The three vanes comprise two outlying vanes, each having two opposed circular peripheral edges configured so that one of the two opposed circular peripheral edges fits against a circular throat when the vanes are in the closed position. A central vane, preferably of hour glass configuration, is located between the two outlying vanes so that all three vanes nest within the circ...

In the case of a valve having a closing member and having a switching element which moves the closing member into the opening direction when a given temperature is reached, it is provided that the closing member can be moved in the opening direction against the effect of a spring which is independent of the function of the switching element and therefore serves as a relief valve which can be adjusted to a desired excess pressure.

A safety valve having a valve body movable toward and from a valve seat with a spring bearing against a spring seat and pressing the valve body against the valve seat has a rotary knob on the housing having a portion engaging a boss on the valve body to slide the valve body away from the valve seat upon rotation of the knob.

A valve has an elongated body open-ended, with a bore with a center line extending from one end of the body to the other. The bore is interrupted by a fluid tight partition, on both sides of which, ports extend through the wall of the body. An elliptical seat is formed on the outer surface of the body between the ports, the seat or channel being diagonal as viewed in side elevation with respect to the bore center line. A sleeve is rotatably mounted on the body. The sleeve has a smoothly cylindri...