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 facilitating micropayments in a financial transaction system
Systems and methods for port mirroring with network-scoped connection-oriented sink
Direct connect single layer touch panel
Cable sheath
Resist composition and method for producing resist pattern
Method of creating exercise routes for a user and related personal navigation device
State control of remote hosts for management of distributed applications
  Randomly Featured Patents
Helleborus plant named `BLT03`
Apparatus for feeding developing solution for a wet type electrophotographic color printer
Optical sensor for reading a pattern
Method and apparatus for monitoring the consistency of successive binary code signal groups in data processing equipment
Maintenance scheduling system, maintenance scheduling method, and image forming apparatus
Positive resist composition
Transcription and nucleic acid sequence determination with short primer DNA/RNA molecules and RNA polymerase
Indane aldehydes and derivatives
Extruded rail-mount with support leg
Process for using a measuring cell assembly for glucose determination