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 device for generating low-jitter clock
Analyte assaying by means of immunochromatography with lateral migration
Method for increasing expression of active tumor necrosis factor receptor family member-Ig fusion proteins
System and method for redundant array copy removal in a pointer-free language
.beta.-2 microglobulin as a biomarker for peripheral artery disease
Lighting device with device for regulating the illumination according to the luminance of the illumination field and corresponding use
  Randomly Featured Patents
Sport court training target assembly
Fireplace mantel
Fragrance-containing plastic coating compositions for paper substrates
Photorefractive materials
Resiliently mounted radiator assembly
Air-fuel ratio control system
1-(4-Amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-tetrahydrofuroyl)piperazine hydrochloride dihydrate
Olefin polymerization catalyst composition
Thin film EL device with protective film
Modular plug having a circuit board