Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Apparatus for controlling a valve










Image Number 3 for United States Patent #4499920.

Apparatus for controlling the aperture size of a valve in a fluid exhaust line from an individual section of glass forming machine is disclosed. The apparatus controls the aperture size of the valve in response to first and second control signals and comprises a driver connected to the valve for decreasing the aperture of the valve from a preset size to a restricted size by a series of discrete steps and then for increasing the aperture of the valve from the restricted size back to the preset size by a series of discrete steps. The driver is responsive to a directional signal and a series of electrical pulses each actuating a corresponding discrete step to decrease the size of the aperture when the directional signal is applied thereto and to increase the size of the aperture when the directional signal is removed therefrom. The apparatus also comprises a control having a first input responsive to the first control signal which when applied causes the control to provide a directional signal and a predetermined number of electrical pulses to the driver for actuating a predetermined number of discrete steps required to decrease the aperture of the valve from the preset size to the restricted size and a second input responsive to the second control signal which when applied causes the control to remove the directional signal from the driver and provide the predetermined number of electrical pulses to the driver to increase the aperture of the valve back to its preset size.








 
 
  Recently Added Patents
Inter vehicle communication system
Wireless device and communication control method
Automatic adjustment of devices in a home entertainment system
Home appreciation participation notes
Information display
Fuel cell system with mechanical check valve
System, method, and computer readable medium for a force-based wheelchair joystick
  Randomly Featured Patents
Semiconductor memory device featuring selective data storage in a stacked memory cell structure
Lenticular x-ray film with improved grating mask and intensifying screen
Enhanced memory module architecture
Powder fluidizing devices and portable powder-deposition apparatus for coating and spray forming
Ball joint construction
Decorative bowl
Production of properly oriented copies of transparent masters
Copying machine with an optic reading device
Arrowhead with recessed collar
Video media distribution network apparatus and method