Resources Contact Us Home
Vacuum valve

Image Number 17 for United States Patent #7862002.

To provide a vacuum valve with an improved endurance of a bellows, a vacuum valve comprises: a valve section including a first port, a second port, a valve seat provided between the first and second ports, and a valve element movable into or out of contact with the valve seat; an actuator section including an orifice through which an operating fluid is supplied to the actuator section, and a piston coupled to the valve element, the piston being allowed to operate according to changes of pressure of the operating fluid to apply a driving force to the valve section; and a bellows which can be contracted and elongated as the valve element vertically moves upward and downward. The orifice is designed to have an effective sectional area determined so that an operating speed of the valve element and the piston is controlled to a predetermined speed for preventing damage of the bellows.

  Recently Added Patents
Method and system for testing indirect bandgap semiconductor devices using luminescence imaging
Use of natriuretic peptide for treating heart failure
Methods for measuring media performance associated with adjacent track interference
Comparison of visual information
Stabilised prostaglandin composition
Neuronal differentiation-inducing peptide and use thereof
Transferring storage devices within storage device testing systems
  Randomly Featured Patents
Method for preparing oxide piezoelectric material wafers
Reusable canister for a gas mask
Process to prepare pyrimidine nucleosides
Catheter apparatus and method for treating occluded vessels
Vascular needle
Apparatus and method for real time data compressor
Pointer type indicating device
Dehydrogenation method and nonacidic multimetallic catalytic composite for use therein
Microorganism of corynebacterium genus having resistance to kanamycin and enhanced L-lysine productivity and method of producing L-lysine using the same
Heat and/or mass transfer processes and apparatus